CN109852323A - Organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive and preparation method thereof - Google Patents

Abstract

The invention discloses a kind of organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive and preparation method thereof, feature be the polyether Glycols for including 1~40 part, 1~35 part of liquid polyesters dihydric alcohol, 1~35 part of crystalline polyester dihydric alcohol, 1~30 part containing isocyanate-modified poly-organosilicon acrylate copolymer, 1~40 part of isocyanates, 0.01~1 part of catalyst, 0.01~1 part of antioxidant and 0.1~2 part of silane coupling agent.By synthesize it is poly- (methacryloxypropyl list block dimethyl polysiloxane-it is random-methyl methacrylate-is random-butyl acrylate-is random-isocyanatoethyl), organic silicon acrylic ester copolymer segment is introduced in base polyurethane prepolymer for use as, Formulation Ingredients efficiently act synergistically, show preferable compatibility, a successive step of going forward side by side other raw materials composition and content, improve polyurethane hot melt synthesis is ageing-resistant and solvent resistance.

Description

Organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive and preparation method thereof

Technical field

The invention belongs to structure glue technical fields, and in particular to a kind of organic-silicon-modified one-component reaction type polyurethane hot melt Glue and preparation method thereof, which are mainly applied to electronics and appliance industry, automobile industry, weaving and shoe industry, food packing industry, timber Material processing and furniture industry isostructuralism are bonded field.

Background technique

Polyurethane hot melt be a new generation can provide superior adhesion can structure glue, it is to be with polyurethane prepolymer Material of main part is equipped with a hot melt adhesive prepared by various auxiliary agents.Polyurethane hot melt is easy to use and environmentally friendly, and performance again can be with Solvent-based thermal melten gel compares favourably.Nearly ten years, polyurethane hot melt is obtained in the high-end fields such as electronics and appliance industry, automobile industry It is fast-developing and be widely used.Polyurethane hot melt is different by cured form, can be divided into thermoplastic polyurethane elastomer hot melt Glue and reactive polyurethane hot melt；Reactive polyurethane hot melt is different by its principle of solidification, can be divided into response type and closing Type；Reaction type polyurethane hot-melt adhesive (PUR) is a kind of one pack system hot melt adhesive, is melted after heating, and flows scatter coated in substrate Surface cools down after adherend bonding and forms excellent first adhesive property, then due to substrate surface contain micro-moisture or its His compound containing active hydrogen reacts with isocyano (- NCO) and chemical crosslink reaction occurs, thus generate have it is highly cross-linked A kind of structural bonding hot melt adhesive of network and cohesive force greatly.

Reaction type polyurethane hot-melt adhesive has technically obtained unprecedented development at present, mainly around high-adhesive-strength, eutectic Body viscosity, open hour reprocess and the progress performances such as cured form are optimized and revised." reactive hot-melt is viscous disclosed in Chinese patent Mixture ", application number are 201480080313.0, prepare it is a kind of with the removable polyurethane-hot melt adhesive reprocessed, more It is suitable for high-end electronic product scope application." solvent-free damp solidifying polyurethane hotmelt combination disclosed in Chinese patent Object ", application number are 201180047316.0, prepare it is a kind of low toxicity quickly establish adhesive property polyacrylate and polyester preparation Polyurethane-hot melt viscose binder.It is " organic disclosed in Chinese patent in order to improve the cured form of reaction type polyurethane hot-melt adhesive Silicon modified polyurethane sealant ", application number are 2017102717258, prepare a kind of organic silicon modified polyurethane sealant, are used Silane coupling agent replaces isocyano (- NCO), is more suitable for applying under high humidity environment.

Currently, the research and development technology of reaction type polyurethane hot-melt adhesive meets different type high-end electronic product in fast development Field application.Although reaction type polyurethane hot-melt adhesive can form highly cross-linked network after hardening, there is also solvent resistant, The performances deficiency problem such as heat-resisting.This main cause is most of reaction type polyurethane hot-melt adhesives to improve its initial cohesiveness, is added A large amount of non-reacted thermoplasticity thickening resin or polynary acrylic copolymer are entered.These non-reaction system thickening resins can not It participates in solidification and generates cross-linked network, to easily reduce the solvent resistance of polyurethane hot melt adhesive coating, heat resistance, resistance to ag(e)ing Energy is equal.

Summary of the invention

A kind of organic-silicon-modified poly- ammonia of one-component response type is provided the purpose of the present invention is overcome the deficiencies in the prior art Ester hot melt adhesive and preparation method thereof can due to introducing silane segment in organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive Further improve solvent resistant, heat resistance, the ageing-resistant performance etc. of polyurethane coating.

In order to achieve the above object, the technical solution of organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive of the invention It is achieved in that it is characterized by comprising 1~40 part of polyether Glycols, 1~35 part of liquid polyesters dihydric alcohol, 1~35 Part crystalline polyester dihydric alcohol, 1~30 part containing isocyanate-modified poly-organosilicon acrylate copolymer, 1~40 part Isocyanates, 0.01~1 part of catalyst, 0.01~1 part of antioxidant and 0.1~2 part of silane coupling agent, are matter above Measure number；The chemical structure containing isocyanate-modified poly-organosilicon acrylate copolymer is: poly- (methacryloxypropyl third Base list block dimethyl polysiloxane-it is random-methyl methacrylate-is random-butyl acrylate-is random-methacrylic acid is different Cyanaoethyl methacrylate) i.e. P(MAPDMS-r-MMA-r-BA-r-ICEMA), contain isocyanate-modified poly-organosilicon acrylate copolymer Number-average molecular weight be 1000~50000.

In the technical scheme, the polyether Glycols are polyoxypropyleneglycol of the number-average molecular weight 500~4000 One or two kinds of any combination of PPG and polytetrahydrofuran ether glycol PTMG；

The liquid polyesters dihydric alcohol be number-average molecular weight 200~2000 polyethylene glycol adipate glycol PEA, gather oneself two Acid -1,6- hexylene glycol esterdiol PHA and polyadipate -1,4-butanediol esterdiol PBA one or more any combination；

The crystalline polyester dihydric alcohol is to win 7380 one or more of wound Degussa model 7320, model 7360 and model Any combination；

The isocyanates is modified diphenylmethane -4,4 '-diisocyanate Desmodur CD-C(MDI performed polymer)；

The catalyst is triethanolamine, one or more kinds of any groups of 2,2- dimorpholine base Anaesthetie Ethers and phosphoric acid It closes；

The antioxidant is one or both of 168 and 1010 any combination；

The silane coupling agent is anilinomethyl triethoxysilane ND-42.

In order to achieve the above object, organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive preparation method of the invention Technical solution is achieved in that it is characterized in that preparation step is as follows:

Step 1 synthesis contains isocyanate-modified poly-organosilicon acrylate copolymer

1~30 part of methacryloxypropyl list is blocked into dimethyl polysiloxane MAPDMS, 1~40 part of methacrylic acid Methyl esters MMA, 1~40 part of butyl acrylate BA and 1~10 part of isocyanatoethyl ICEMA be dissolved in 50~ In 100 parts of toluene, 40~110 DEG C are controlled in, under nitrogen protection, 0.1~2 part of thermal initiator peroxidating 2- ethyl is added Caproic acid tert-pentyl ester polymerization reaction 2~50 hours, after rotary evaporation removes toluene, obtains and contains isocyanate-modified poly-organosilicon third Olefin(e) acid ester copolymer, the number-average molecular weight containing isocyanate-modified poly-organosilicon acrylate copolymer are 1000~50000；Institute The number-average molecular weight for stating methacryloxypropyl list sealing end dimethyl polysiloxane MAPDMS is 1000；

Step 2 synthesizing organo-silicon is modified one-component reaction type polyurethane hot-melt adhesive

By 1~40 part of polyether Glycols, 1~35 part of liquid polyesters dihydric alcohol, 1~35 part of crystalline polyester dihydric alcohol, After 0.01~1 part of catalyst and the mixing of 0.01~1 part of antioxidant, 120~150 DEG C are calorified, water removal about 1~3 is vacuumized Hour, until the water content of mixture is lower than 280ppm, cool down in 70~100 DEG C, under nitrogen protection, is added 1~40 part Isocyanates and 1~30 part contain isocyanate-modified poly-organosilicon acrylate copolymer, carry out polymerization reaction 1~10 it is small When, sampling analysis polymerizate NCO% content reaches 1%~3%, and viscosity reaches 3000~15000 mPa.s at 100 DEG C, is added 0.1~2 part of silane coupling agent obtains organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive, is above mass fraction.

In the technical scheme, with Brookfield DV-C digital viscometer viscosity, test setting temperature is 100 ℃。

Compared with prior art, the present invention have following advantages and effects

1, the present invention solves the deficiencies of traditional reaction type polyurethane hot-melt adhesive solvent resistance, heat resistance and ageing-resistant performance Defect be in the technical solution of the present invention a kind of organosilicon list containing isocyanate-modified poly-organosilicon acrylate copolymer Body, acrylic ester monomer and isocyanate function monomer are copolymerized.Organic silicon monomer can promote the solvent resistance of hot melt adhesive Energy, heat resistance and ageing-resistant performance.Acrylic ester monomer can promote hot melt adhesive tack.Isocyanate function monomer can incite somebody to action Containing isocyanate-modified poly-organosilicon acrylate copolymer subparticipation to base polyurethane prepolymer for use as synthetic reaction, efficiently collaboration is made With showing preferable compatibility, a successive step of going forward side by side other raw materials composition and content improve solvent resistance and adhesive force.

2, thickening resin acrylic copolymer random polycondensation is introduced base polyurethane prepolymer for use as by the present invention, improves thickening resin With the compatibility of polyurethane, further the deficiencies of solving the problems, such as reaction type polyurethane hot-melt adhesive solvent resistance；

3, the present invention solves the problems, such as that traditional reaction type polyurethane hot-melt adhesive is poor to substrate wet performance, improves hot melt adhesive and applies The flow leveling of glue, packaging and Process of Applying Glue are not likely to produce bubble.

Specific embodiment

Below with reference to embodiment, the present invention is described in further detail, and embodiments of the present invention are not limited thereto. Number involved in following embodiment is mass fraction.

Embodiment one

It is a kind of organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive, is prepared by the following steps to obtain:

Step 1 synthesis contains isocyanate-modified poly-organosilicon acrylate copolymer

10 parts of methacryloxypropyl list is blocked into dimethyl polysiloxane MAPDMS, 30 parts of methyl methacrylate MMA, 15 parts of butyl acrylate BA and 5 parts of isocyanatoethyl ICEMA are dissolved in 60 parts of toluene, control In 90 DEG C, under nitrogen protection, the thermal initiator peroxidating 2 ethyl hexanoic acid tert-pentyl ester of 1.5 parts of addition, polymerization reaction 5 hours, It after rotary evaporation removes toluene, obtains and contains isocyanate-modified poly-organosilicon acrylate copolymer, containing isocyanate-modified poly- The number-average molecular weight of organic silicon acrylic ester copolymer is 15000, and chemical structure is: poly- (methacryloxypropyl list envelope Hold dimethyl polysiloxane-it is random-methyl methacrylate-is random-butyl acrylate-is random-methacrylic acid isocyano group second Ester) i.e. P(MAPDMS-r-MMA-r-BA-r-ICEMA)；The methacryloxypropyl list blocks dimethyl polysiloxane The number-average molecular weight of MAPDMS is 1000, No. CAS: 146632-07-7；

Step 2 synthesizing organo-silicon is modified one-component reaction type polyurethane hot-melt adhesive

By 20 parts of polyoxypropyleneglycol PPG, 15 parts of polyethylene glycol adipate glycol PEA, 20 parts of crystalline polyester After the phosphoric acid and 0.08 part of irgasfos 168 that 7320,0.08 parts of dihydric alcohol mix, 150 DEG C are calorified, water removal 1 hour is vacuumized, Until the water content of mixture is lower than 280ppm, cool down in 70 DEG C, under nitrogen protection, 30 parts of modification hexichol first is added Alkane -4,4 '-diisocyanate Desmodur CD-C(MDI performed polymer) and the step of 10 parts one synthesis containing isocyanate-modified Poly-organosilicon acrylate copolymer carries out polymerization reaction 3 hours, and sampling analysis polymerizate NCO% content reaches 2.6%, glues Degree reaches 4500 mPa.s, 0.9 part of silane coupling agent ND-42 is added, obtains organic-silicon-modified one-component reaction type polyurethane Hot melt adhesive is mass fraction above；The number-average molecular weight of the polyoxypropyleneglycol PPG is 1000, the polyadipate The number-average molecular weight of glycol ester glycol PEA is 500, is measured at 100 DEG C with Brookfield DV-C Digital Viscometer viscous Degree.

Embodiment two

It is a kind of organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive, is prepared by the following steps to obtain:

Step 1 synthesis contains isocyanate-modified poly-organosilicon acrylate copolymer

20 parts of methacryloxypropyl list is blocked into dimethyl polysiloxane MAPDMS, 20 parts of methyl methacrylate MMA, 20 parts of butyl acrylate BA and 7 parts of isocyanatoethyl ICEMA are dissolved in 80 parts of toluene, control In 100 DEG C, under nitrogen protection, 1.0 parts of thermal initiator peroxidating 2 ethyl hexanoic acid tert-pentyl ester is added, polymerization reaction 10 is small When, it after rotary evaporation removes toluene, obtains and contains isocyanate-modified poly-organosilicon acrylate copolymer, containing isocyanate-modified The number-average molecular weight of poly-organosilicon acrylate copolymer is 25000, and chemical structure is: poly- (methacryloxypropyl list Block dimethyl polysiloxane-it is random-methyl methacrylate-is random-butyl acrylate-is random-methacrylic acid isocyano group Ethyl ester) i.e. P(MAPDMS-r-MMA-r-BA-r-ICEMA)；The methacryloxypropyl list blocks dimethyl polysiloxane The number-average molecular weight of MAPDMS is 1000, No. CAS: 146632-07-7；

Step 2 synthesizing organo-silicon is modified one-component reaction type polyurethane hot-melt adhesive

By 25 parts of polytetrahydrofuran ether glycol PTMG, 20 parts of polyadipate -1,6- hexylene glycol esterdiol PHA, 25 parts of knot After the triethanolamine and 0.5 part of irgasfos 168 that 7360,0.5 parts of crystalline polyester dihydric alcohol mix, 140 DEG C are calorified, is vacuumized Water removal 2.5 hours cools down until the water content of mixture is lower than 280ppm in 80 DEG C, under nitrogen protection, is added 30 parts Modified diphenylmethane -4,4 '-diisocyanate Desmodur CD-C(MDI performed polymer) and 15 parts of step 1 synthesis contain isocyanide Acid esters is modified poly-organosilicon acrylate copolymer, carries out polymerization reaction 5 hours, sampling analysis polymerizate NCO% content reaches 2.5%, viscosity reaches 6100 mPa.s, and 1.5 parts of silane coupling agent ND-42 is added, obtains organic-silicon-modified one-component response type Polyurethane hot melt is mass fraction above.The number-average molecular weight of the polytetrahydrofuran ether glycol PTMG is 2000, described The number-average molecular weight of polyadipate -1,6- hexylene glycol esterdiol PHA is 1000, is existed with Brookfield DV-C Digital Viscometer Viscosity is measured at 100 DEG C.

Embodiment three

It is a kind of organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive, is prepared by the following steps to obtain:

Step 1 synthesis contains isocyanate-modified poly-organosilicon acrylate copolymer

25 parts of methacryloxypropyl list is blocked into dimethyl polysiloxane MAPDMS, 30 parts of methyl methacrylate MMA, 20 parts of butyl acrylate BA and 9 parts of isocyanatoethyl ICEMA are dissolved in 85 parts of toluene, are controlled in 95 DEG C, under nitrogen protection, 0.5 part of thermal initiator peroxidating 2 ethyl hexanoic acid tert-pentyl ester is added, polymerization reaction 15 hours, revolves Turn to obtain and contain isocyanate-modified poly-organosilicon acrylate copolymer after evaporation removes toluene, poly- have containing isocyanate-modified The number-average molecular weight of machine Si acrylate copolymer is 37000, and chemical structure is: poly- (methacryloxypropyl list sealing end Dimethyl polysiloxane-is random-and methyl methacrylate-is random-and butyl acrylate-is random-isocyanatoethyl) That is P(MAPDMS-r-MMA-r-BA-r-ICEMA)；The methacryloxypropyl list blocks dimethyl polysiloxane MAPDMS Number-average molecular weight be 1000, No. CAS: 146632-07-7；

Step 2 synthesizing organo-silicon is modified one-component reaction type polyurethane hot-melt adhesive

By 30 parts of polyoxypropyleneglycol PPG, 15 parts of polyethylene glycol adipate glycol PEA, 20 parts of crystalline polyester After 7360,0.1 parts of dihydric alcohol of 2,2- dimorpholine base Anaesthetie Ether and the mixing of 0.5 part of antioxidant 1010,150 DEG C are calorified, Water removal 3 hours is vacuumized, until the water content of mixture is lower than 280ppm, cools down in 80 DEG C, under nitrogen protection, is added 30 Part modified diphenylmethane -4,4 '-diisocyanate Desmodur CD-C(MDI performed polymer) and one synthesize the step of 20 parts Containing isocyanate-modified poly-organosilicon acrylate copolymer, carry out polymerization reaction 6 hours, sampling analysis polymerizate NCO% contains Amount reaches 2.3%, and viscosity reaches 7500 mPa.s, and 1.3 parts of silane coupling agent ND-42 is added, obtains organic-silicon-modified one-component Reaction type polyurethane hot-melt adhesive is mass fraction above；The number-average molecular weight of the polyoxypropyleneglycol PPG is 3000, The number-average molecular weight of the polyethylene glycol adipate glycol PEA is 1500, is existed with Brookfield DV-C Digital Viscometer Viscosity is measured at 100 DEG C.

Example IV

It is a kind of organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive, is prepared by the following steps to obtain:

Step 1: synthesis contains isocyanate-modified poly-organosilicon acrylate copolymer

30 parts of methacryloxypropyl list is blocked into dimethyl polysiloxane MAPDMS, 20 parts of methyl methacrylate MMA, 35 parts of butyl acrylate BA and 10 parts of isocyanatoethyl ICEMA are dissolved in 100 parts of toluene, control 100 DEG C are formed on, under nitrogen protection, 0.2 part of thermal initiator peroxidating 2 ethyl hexanoic acid tert-pentyl ester is added, polymerization reaction 8 is small When, it after rotary evaporation removes toluene, obtains and contains isocyanate-modified poly-organosilicon acrylate copolymer, containing isocyanate-modified The number-average molecular weight of poly-organosilicon acrylate copolymer is 42000, and chemical structure is: poly- (methacryloxypropyl list Block dimethyl polysiloxane-it is random-methyl methacrylate-is random-butyl acrylate-is random-methacrylic acid isocyano group Ethyl ester) i.e. P(MAPDMS-r-MMA-r-BA-r-ICEMA)；The methacryloxypropyl list blocks dimethyl polysiloxane The number-average molecular weight of MAPDMS is 1000, No. CAS: 146632-07-7；

Step 2 synthesizing organo-silicon is modified one-component reaction type polyurethane hot-melt adhesive

By 35 parts of polyoxypropyleneglycol PPG, 30 parts of polyadipate -1,4-butanediol esterdiol PBA, 15 parts of crystal type After the triethanolamine and 0.6 part of irgasfos 168 that 7380,0.3 parts of polyester diol mix, 150 DEG C are calorified, water removal is vacuumized 2 hours, until the water content of mixture is lower than 280ppm, cools down in 90 DEG C, under nitrogen protection, 35 parts of modification two is added Phenylmethane -4,4 '-diisocyanate Desmodur CD-C(MDI performed polymer) and the step of 30 parts one synthesis contain isocyanates Modified poly-organosilicon acrylate copolymer, carries out polymerization reaction 3 hours, sampling analysis polymerizate NCO% content reaches It is even that 0.4 part of silane is added in 2.1%, viscosity (100 DEG C of mPa.s@, Brookfield DV-C Digital Viscometer) 9000 mPa.s Join agent ND-42, obtains organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive, be above mass fraction；The polyoxygenated The number-average molecular weight of propylene glycol PPG is 4000, and (number-average molecular weight of PBA is the polyadipate -1,4-butanediol esterdiol 2000, viscosity is measured at 100 DEG C with Brookfield DV-C Digital Viscometer.

Performance test

The present invention is anti-referring to the organic-silicon-modified one-component that the universal method of current hot melt adhesive obtains the four kinds of above embodiments Answer type polyurethane hot melt adhesive carry out melt viscosity, the open hour, shore hardness, elongation at break, shear strength and with resistance to oleic acid Testing performance index.Melt viscosity is tested referring to HG/T3660-1999 standard, selects No. 27 rotors, is arranged 100 DEG C.It opens Put the time is tested referring to ASTM D4497-1994 (2004) method.Shore hardness is carried out referring to GB-T2411-2008 standard Test.Elongation at break is tested referring to GB/T30776-2014 standard.Shear strength referring to GB/T7124-2004 standard into Row test.The specific test method of solvent resistance index is to prepare sample with reference to test shear strength method, and it is small that sample places 72 When solidification after, sample is soaked in oleic acid (purity 98%) solution 24 hours, takes out sample, is placed in 85 DEG C and 85% relatively wet It spends under environment, after carrying out aging 1000 hours, then carries out shear strength test.Water contact angle is marked with reference to GB/T 30693-2014 Standard is tested.All test data comparative situations are see the following table 1.

Each embodiment specific performance of table 1 tests control case

It can be seen that the organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive of the invention synthesized with excellent from the data of table 1 Good solvent resistance, ageing-resistant performance and hydrophobic performance.

The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention, It should be equivalent substitute mode, be included within the scope of the present invention.

Claims (3)

1. a kind of organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive, it is characterised in that including 1~40 part of polyethers binary Alcohol, 1~35 part of liquid polyesters dihydric alcohol, 1~35 part of crystalline polyester dihydric alcohol, 1~30 part containing isocyanate-modified Poly-organosilicon acrylate copolymer, 1~40 part of isocyanates, 0.01~1 part of catalyst, 0.01~1 part of antioxidant It is above mass fraction with 0.1~2 part of silane coupling agent；It is described total containing isocyanate-modified poly-organosilicon acrylate The chemical structure of polymers is: it is poly- (methacryloxypropyl list block dimethyl polysiloxane-it is random-methyl methacrylate- Randomly-butyl acrylate-is random-isocyanatoethyl) i.e. P(MAPDMS-r-MMA-r-BA-r-ICEMA) and, containing different The number-average molecular weight of cyanate modified poly-organosilicon acrylate copolymer is 1000~50000.

2. organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive according to claim 1, it is characterised in that:

The polyether Glycols are polyoxypropyleneglycol PPG and polytetrahydrofuran ether two of the number-average molecular weight 500~4000 One or two kinds of any combination of alcohol PTMG；

The liquid polyesters dihydric alcohol be number-average molecular weight 200~2000 polyethylene glycol adipate glycol PEA, gather oneself two Acid -1,6- hexylene glycol esterdiol PHA and polyadipate -1,4-butanediol esterdiol PBA one or more any combination；

The crystalline polyester dihydric alcohol is to win 7380 one or more of wound Degussa model 7320, model 7360 and model Any combination；

The isocyanates is modified diphenylmethane -4,4 '-diisocyanate Desmodur CD-C(MDI performed polymer)；

The catalyst is triethanolamine, one or more kinds of any groups of 2,2- dimorpholine base Anaesthetie Ethers and phosphoric acid It closes；

The antioxidant is one or both of 168 and 1010 any combination；

The silane coupling agent is anilinomethyl triethoxysilane ND-42.

3. a kind of organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive preparation method, it is characterised in that preparation step is as follows:

Step 1 synthesis contains isocyanate-modified poly-organosilicon acrylate copolymer

1~30 part of methacryloxypropyl list is blocked into dimethyl polysiloxane MAPDMS, 1~40 part of methacrylic acid Methyl esters MMA, 1~40 part of butyl acrylate BA and 1~10 part of isocyanatoethyl ICEMA be dissolved in 50~ In 100 parts of toluene, 40~110 DEG C are controlled in, under nitrogen protection, 0.1~2 part of thermal initiator peroxidating 2- ethyl is added Caproic acid tert-pentyl ester polymerization reaction 2~50 hours, after rotary evaporation removes toluene, obtains and contains isocyanate-modified poly-organosilicon third Olefin(e) acid ester copolymer, the number-average molecular weight containing isocyanate-modified poly-organosilicon acrylate copolymer are 1000~50000；Institute The number-average molecular weight for stating methacryloxypropyl list sealing end dimethyl polysiloxane MAPDMS is 1000；

Step 2 synthesizing organo-silicon is modified one-component reaction type polyurethane hot-melt adhesive

By 1~40 part of polyether Glycols, 1~35 part of liquid polyesters dihydric alcohol, 1~35 part of crystalline polyester dihydric alcohol, After 0.01~1 part of catalyst and the mixing of 0.01~1 part of antioxidant, 120~150 DEG C are calorified, water removal about 1~3 is vacuumized Hour, until the water content of mixture is lower than 280ppm, cool down in 70~100 DEG C, under nitrogen protection, is added 1~40 part Isocyanates and 1~30 part contain isocyanate-modified poly-organosilicon acrylate copolymer, carry out polymerization reaction 1~10 it is small When, sampling analysis polymerizate NCO% content reaches 1%~3%, and viscosity reaches 3000~15000 mPa.s at 100 DEG C, is added 0.1~2 part of silane coupling agent obtains organic-silicon-modified one-component reaction type polyurethane hot-melt adhesive, is above mass fraction.