JPS583745A - Resin binder for casting - Google Patents

Abstract

PURPOSE:To provide a resin binder for shell molds which is so formulated as to be collapsed easily by mechanical impact alone after casting by melting a specific amt. of phoshoric ester in a phenolic resin. CONSTITUTION:A resin binder for shell molds wherein 10-50pts.vol. phosphoric ester such as triphenyl phosphate is melted in 100pts.wt. phenolic resin of novolak type or resol type or a mixture of both. If necessary, 1-10pts. lubricant is contained in 100pts. phenolic resin. The molds produced by using such resin binder and coated sand are collapsed by mechanical impact alone without heat treatments after casting. This binder is applied to resin coated sand for castings of aluminum or the like.

Description

[Detailed description of the invention] The original F! A is related to a resin binder for shell molds, and it is used in the production of relatively low-grade castings, such as L% aluminum, aluminum alloy, and alloy WIJ. Resin binder for shell molds 1 (related information).

In general, the binder used in the fat-filled sand for rice cakes is phenol and formfulghyde (1111). When used in a sand mold for a low profile, a large amount of cost and labor is required to remove the sand after casting.

In other words, in the case of these 2-step warm-up molds, even after casting, the mold still maintains its strength due to the low pouring temperature, and the temperature of 6 to 12 time%
Heat treated and Kutoshi.

impact? If you don't add it, the mold will not collapse, and after casting, f
! ! ! This requires a huge amount of cost and effort.

I've been crying out recently about saving energy, IM heat treatment.
]1 (There is a strong demand for a resin binder for shell molds that does not require 1J.

As a result of intensive research, the present inventor aimed to develop a resin binder for shell molds that does not require post-casting heat treatment and disintegrates only by mechanical impact. It was found that υ disintegration property was significantly improved, and the invention of the present invention is for shell molds made by melting 710 to 50 parts by weight of phosphoric acid ester to 100 parts by weight of phenolic resin and producing a kW characteristic of 90. This relates to a mercury caking agent, and molds manufactured using a broken sand bath at 100 to 200°C containing the caking agent of the present invention and, if necessary, hexamethylenetetrine, cannot be replaced with conventional molds. The disintegration property was significantly improved compared to 7, and it became clear that it would disintegrate only by mechanical impact even without the lxJ heat treatment after casting. It's been a long time since I've been in the middle of a long time! For information on Tanaka Shin #IIrc, please refer to the literature (5chvyten H, A, jtml, A
dvanc@.

According to Chem, Ser., 9, 7-20 (1954), phosphorus compounds or phenolic resins promote the dehydration reaction of polymers containing VC cough substance in their molecules to promote carbonization. It is thought that the flammability is the same as above.The effect obtained by the present invention is that the carbonization effect is significantly accelerated, but the carbonization is greatly promoted.
It is thought that the cohesive strength decreases or the disintegration property decreases. Novolac type phenolic resin with phosphorus range esters t-a 5-51% cold mouth opening 50-9
Novolac type phenolic resin phosphate ester #
41e molten mixture ↓ 9 inverted shield υ molten viscous rat or small 9f LIIj The amount of addition is (15 to 5 weight 1%) to the phenolic resin.
and few. According to the inventor's experiments, no improvement in disintegration Vi was observed with the addition amount of [I[], indicating that 10 to 50 parts by weight of phosphoric acid ester is required per 100 parts by weight of phenolic resin. US Pat. No. 9,012,402 describes a method in which 10 to 40 parts of phosphoric acid ester are added to 100 parts by weight of phenolic resin. But this technique is powder υ) - rack ai! The technology relates to the production of cold-processed silica sand using phenolic resin.
If the phosphoric acid ester is coated with the mold in advance as gent) and then coated with powdered novolac type phenol resin and hexamethylenetetramine, the phosphoric acid ester will slightly suppress the phenol fat. The phenolic resin softens and binds the silica sand and phenol IIJI firmly, and the strong turbulent flow of air produces sand that does not shrink or sag.

However, according to the method, as stated in the specification, phosphoric acid ester has only a slight solubility in phenol fat, so it is incorporated between silica sand and 2-enol resin, The O surface MICFi has only a small amount of phosphoric acid ester. Therefore, this method cannot be used to greatly improve the t1 disintegration property when used in waxed sand, aluminum castings, etc. In the present invention, by melting the phosphoric acid ester in the phenol flank in advance, it is possible to increase the phosphorus content of the silica sand after a61, and it has been recognized that the disintegration property υ is greatly improved. it is conceivable that.

Hereinafter, non-invention will be explained in more detail.

The phenolic resin used in this J111 light is Novo2Tsukufilphenol1M. Phenol n11m, & and their f + J sweeteners and blends can be used as 60 novolac type phenolic resins, in addition to the commonly used phenol formaldehyde novolac phenolic resin, so-called high ortho type novolac resins, and those modified with alkylphenols. You can use Kunobo 2 Tsuku fat.

It is very preferable to use solid resol type phenol wNI as the phenol w fat in the present invention. Solid resol m phenolic tree M'f! In the example using 'k', higher decay was obtained than in the example using novolak fli 7 x nord tree Wk. Since it has a nitrogen-containing bond called KN-methylene in its molecule, it is considered to be a friend because it has improved heat resistance and low disintegration compared to novolak m-phenol resin, which only has methylene bonds.

The resol-type phenolic resin that can be used in the present invention includes ammonia, a resol-type phenolic resin as an amine SR catalyst, ammonia or a combination of ammonia and hydroxides of alkali metals and alkaline earth metals. The obtained resol type phenolic resin can be used.

The above novolak type phenolic resin binder and resol fJ
! It is also possible to produce resin-treated sand by using a phenol fat binder in combination.

In addition, resol type phenol 1IB is used as a phenolic resin.
V! It is advantageous to use a novolak m phenolic resin blend to improve mold quality.

Since novolac type phenol resin has a slow curing speed, it is preferable to use hexamethylenetetramine 11:f as a curing agent, preferably 60 parts by weight or less per 100 parts by weight of resol type phenol. Up to 200 parts by weight can be used. Phosphate ester 'a' melted resol type phenol fat and Novo 2 Tsuku type phenol *fat vmm product are manufactured.
In the method (2), two enol formaldehyde and an alkali catalyst are placed in a reaction vessel and heated to carry out the assembly reaction. After shaving, the dehydrated I5 is applied to the solid or molten novolak type phenolic resin and the phosphoric acid ester I.
I-Dissolve S. In this case, Novolac! 14m,
It may be added to the phosphoric acid ester during the dehydration reaction.

Another method is to crush or crush solid resol-type phenolic resin, novolac m phenolic resin and phosphate ester, extrusion molding with Sei@2 and hexamethylenetetramine kIIA 710 depending on the requirements. Build a.

The phosphoric acid ester may be melted in advance in a resol type phenolic resin, 't, or a novolac type dienol resin.

It is preferable to add a lubricant to the phenolic resin because it improves the blocking resistance as well as the mold hardness.As the lubricant, ethylene bisstearamide, ethylene bisoleic acid amide, methylene bisstearamide, and oxystearic acid are preferable. Amide stearamide.

1 if you use palmitic acid amide, oleic acid amide, etc.! Ru. The lubricant is 1 part by weight for 100 parts by weight of phenolic resin.
If the weight is less than 10 weights, the effect will be small, and if it exceeds 10 weights, the curing speed will be slow and the contact layer between the sand grains will be difficult, so it is not preferable.

The phosphoric acid ester used in the present invention #4 is trimethyl phosphate and triethyl boschate.

Tripterphosphate, tributerphosphate, triocterphosphate, tributoxyethylphosphate, trischloroethylphosphate.

ls/H loprovir phosphor)s)! Jfenihhoy,
xylenyl phosphate, cresyl diphenyl phosphate, octer di-2enyl phosphate, xylenyl diphenyl phosphate, trilacryl phosphate, triceter phosphate,
Tristearyl phosphite,) esters such as lyoleyl phosphate, trimethyl phosphite, triethyl phosphite, tributyl phosphite, triphenyl phosphite, tridodecyl phosphite st
”) Snonylphenyl phosphite, trischloroether phosphite, tristridecyl phosphite: Ii
! Phosphite diester dipter, bunalphosphonate, di(2-
Ethylhexyl)2-ethylhexylphosphonate and other phosphonic acid esters or phosphoric acid esters that can be used are phenolic resins 1a.

If 10-50 mm Sumire is used for Sada Jli part, the effect is less than o10 Makurabe.S is small and if it exceeds 501 miyako, #l
This is unfavorable because it lowers l1fJ strength and lowers the melting point of the sand being sanded. The phosphoric acid ester is homogeneously dissolved in 1 uir of phenol.

A hardening agent such as phenolic resin or dihexane may be added to the phenolic resin.

Examples and comparative examples of the present invention will be explained below.〇Example 1 Four-sided flask equipped with stirring, reflux condenser, and temperature [tf] IIC phenol 1880 g, 80% paraformaldehyde 375 g, 37% formalin 487 g% IN
Salt TL! Weigh 4 gk and mix without stirring 7111 on an oil bath.
Heat for 1 hour and react at ring fi temperature until the reaction solution emulsifies. After that, 1 reaction was carried out under reflux mHL for 2 hours, 376 gk of triphenyl phosphate was added, and after 7 hours, 2230 gk of a novolac type phenolic resin binder containing a phosphoric acid ester with a softening point of 81° C. was melted under reduced pressure.Example 2 Stirrer, reflux condenser, thermometer 1F - Four eyes equipped 7a) 1880 g of phenol, 450 g of 80% paraformaldehyde, 162 g of 37% formalin 1! r
￥: Add 22 g of zinc acid to a pestle, heat on an oil bath without stirring, and react at reflux temperature for 4 hours. After that, do not concentrate 15
Reacts at 0°C, softening point or 95°C VC 7? 376glr of phosphoric acid ester with a softening point of 82°C was melted, and 2160gl of ion-type novolak resin binder was obtained with 2160gk of Tokutomo O Soy Example 3 Fu mvsu1. Novolak type phenol mBW200 gk7ff 15
Mix at 0°C 1! ! Melt 7g of ethylene bisstearamide, dissolve it, add the phosphoric acid ester, add the phenolic binder, add the phenolic binder, and add the 210g of ethylene bisstearamide. Phenol 940g 57% formalin 1460 in a four-sol flask equipped with a stirrer and a Hl flow condenser
238 g of 25% ammonia water was mixed in a mortar, heated on an oil bath without stirring, and allowed to react at 70°C for 1 hour. After 270 g of triphenyl phosphate was concentrated under reduced pressure, the temperature was gradually raised to fill the mixture. When the temperature reached 95°C, the plate was taken out and cooled, and 1630 g of a solid resol type phenol IIN fat binder containing fused phosphoric acid ester was added.

implementation? l15 On the side, equipped with a reflux condenser and a thermometer, put 940 g of phenol in a 94-eye flask, 537% formalin 1460.
g 25% ammonia water 238 1 20% sodium hydroxide aqueous solution 20 g 11 - Weighed and heated on an oil bath at 70°C, 1
Added 270 gk of tricresyl phosphate,
Concentrate # under reduced pressure after IJllll! Without doing this, gradually raise the temperature, and when it reaches 95°C, take out the plate, cool it down, and make phosphorus rice ester. Melt and solidify the sol type phenolic resin binder to obtain 1650gk Example 6 In a four-eye flask equipped with stirring, reflux condenser, and 1IIjL meter, 940g of 7 enol and 37% formalin 1 were added.
460g125% ammonia water 258gkl! Heat it on an oil bath without stirring and let it react at 70°C for 1 hour.
After 70 days, the temperature was gradually raised while performing concentrated mt under reduced pressure until the temperature reached 95°C. Phenol W fat 340g? to Riphenylphos) 540g
9. 40gt of ethylene bisstearamide was added and mixed and taken out in a plate to obtain 2100g of solid resol type phenolic resin adhesive containing Novo2tsu 1M fat, phosphate ester, and lubricant! - Obtainable ratio f Example 1 In a Tomoyotsuro flask equipped with a stirrer, a reflux condenser, and a head gauge, 1880 g of 7s, 575 g of 80% paraformaldehyde, 487 g of 57% formalin, 4 IN hydrochloric acid
Weigh g', heat it on an oil bath without stirring, and let it react for 2 hours until the reaction mixture is emulsified.
The reaction was carried out directly and then carried out under reduced pressure until the softening point was 86.
℃V Novo 2 Tsuta frfus, t-h @ Kumoku 1960
gk obtained 90 comparison fv2 ratio I2 novolac type phenol l fat obtained in example 1
00 gk7a) S: Raise the temperature to 150℃Ct in ff,
Melt 8g of triphenyl phosphate in a bath and dissolve 4% 1 of phosphoric acid ester in a bath to obtain a 2-type functional phenol resin sticky sweetener. Comparing the stiffness of caking agents, resin-containing sand was produced under the following conditions.

Example 1.2.3. Comparative Example 1.2 150°C VC heating, 7 Limantle silica sand, 8 rice grains, and 1 resin
44g and mix for 40 seconds with a T-speed mixer, then add 15% hexametherentetate phosphoric acid, water bath solution 14
Add 4gk and mix for 60 seconds! Example 4.5.6 Heat to 150°C, 8 kg of Freemantle silica sand, 144 g of resin, and t speed. In a mixer, mixed for 4 seconds (mixed 120 zkm of water for 60 seconds, added 8 g of IZJ calcium stearate, mixed for 20 seconds, discharged, and passed through a resin composite machine 11 pages). The landing point shown at the bottom is JIS x-#5soec.

- Sharpness: According to JI8 1c-selo.

Claims (1)

[Claims] 1.2 phosphoric acid ester 1t10-501 Dobe melted to 1001 Juto, 9 features and 6
Resin binder for V Elmold 02 Phenol November 1
Claim 1 characterized in that f5 is a novolak type phenolic resin Claim characterized in that the resin binder for shell molds according to claim 1 is a phenolic resin or a resol type phenolic resin. Range 1st term @(
Q Resin binder 04 for shell molds is a phenolic resin or a mixture of novolac type phenol II fat and resol type phenol 1M fat Claim 4 $1 for shell molds Resin binder. 5.7 Enol resin contains 1 to 101 lubricants for 2-enginel resin 100 heavy neck S, and 7 is a resin. Resin binder for shell molds in item 3 or 4