CN101358008A - Preparation method of special material for buried polyethylene drainage pipe - Google Patents

Abstract

The invention relates to a preparation method of special material of buried polyethylene drainage pipe. The method includes the following steps: modified fly ash, heavy calcium carbonate and crystal whisker are put in a high-speed mixing machine according to weight percentage for cold mixing for 5 to 10 minutes to produce uniformly dispersed powder; B. HDPE polyethylene, maleic anhydride grafted polyethylene and lubricant are put in the high-speed mixing machine according to the weight percentage for mixing and heating simultaneously, and the uniformly dispersed powder produced by the high-speed mixing machine in Step A is put in the high-speed mixing machine to be premixed for 5 to 10 minutes to produce granular mixture; C. the granular mixture produced in Step B is fed into a twin-screw extruder to extrude the special material, wherein, the temperature of the feed port is 150 to 160 DEG C, the temperature of the melt is 200 to 220 DEG C, the temperature of the die is 200 to 210 DEG C. The special material has the characteristics of strong corrosion resistance and long service life, and the cost of the pipe is significantly reduced.

Description

A kind of preparation method of special material for buried polyethylene drainage pipe

Technical field:

The present invention relates to a kind of polyethylene special-purpose material preparation method, particularly use the preparation method of inoganic particle modified PP Pipe Compound.

Background technology:

The plastic underground water shoot mainly is divided into the blow-off line of carrying sewage and row's storm sewer of delivering rainwater.The main raw material(s) of this pipeline is polyethylene and polyvinyl chloride.In the world this kind pipeline widespread use decades, China just promoted the use of after 1998.Along with the increase of market demands with to improving constantly that the tubing technical feature requires, particularly under the requirement of satisfying tubing life-time service reliability, its rigidity and toughness there is higher requirement.Discharge complicated component in buried drain pipe is managed when works better, tubing will bear the acting in conjunction of static load (soil weight) and moving load (traffic).Based on the work characteristics of buried drain pipe, this pipeline should have the splendid ability of bearing outer compressive load and keeping shape stability; Has higher mechanical strength and impelling strength to keep the tubing globality; Also should have excellent wear and suitable stress crack resistant ability.

Also be in the starting stage as the poly development and application of main raw material of producing buried drain pipe, numerous at home manufacturing enterprises tubing composition of raw materials is more, mainly contains virgin resin, virgin resin and adds calcium carbonate masterbatch, virgin resin and add new function PP Pipe Compound, special-purpose resin modified matrix material.At present, these buried drain pipe material PP Pipe Compound exist intensity low (especially flexural strength and Young's modulus), shortcomings such as weighting agent cost height on the market.But the PP Pipe Compound that some costs are low makes that because of the prescription problem its processing characteristics is bad, plasticizing is slow, and tube forming and outward appearance are not good.

Summary of the invention:

The present invention is in order to solve problems such as buried drain pipe PP Pipe Compound cost height, rigidity be low, a kind of preparation method of special material for buried polyethylene drainage pipe is provided, be used for buried drain pipe by the material of this method preparation and have favorable rigidity, the anti-cracking performance of tubing, resistance to pressure, stability all make moderate progress, have that erosion resistance is strong, the characteristics of long service life, and the cost of tubing reduces significantly.

The technical solution used in the present invention is: the preparation method's of this special material for buried polyethylene drainage pipe step is as follows:

A, mixing: by weight percentage modified coal ash 10～15%, water-ground limestone 5～15%, whisker 8～15% are put into high mixer after 5～10 minutes cold mixing, obtained finely dispersed powder;

B, high mixing: by weight percentage HDPE polyethylene 60～72.5%, maleic anhydride grafted polyethylene 2～3%, lubricant 0.5～1% are put into high mixer and stirred, be heated to 100～120 ℃ when stirring, then steps A is obtained finely dispersed powder after mixed and adds in the high mixer through high mixer is cold, obtain particulate mixtures at premix under 2000 rev/mins the condition after 5～10 minutes at the high mixer medium speed;

C, mixing: the granular admixture material that step B obtains is delivered in the twin screw extruder, and the opening for feed temperature is 150～160 ℃, and melt temperature is 200～220 ℃, and die temperature is that 200～210 ℃ temperature range is extruded PP Pipe Compound.

The beneficial effect that the present invention has is: be used for buried drain pipe by the material of this method preparation and have favorable rigidity, the anti-cracking performance of tubing, resistance to pressure, stability all make moderate progress, have that erosion resistance is strong, the characteristics of long service life, and the cost of tubing reduces significantly.Reaching under the situation of identical ring stiffness, every meter of buried drain pipe material is cost-saved more than 8% after using the present invention, produces 700 tons of calculating per year, and year saving cost is more than 700,000, reducing cost to promote the market competitiveness of buried drain pipe simultaneously, promotes production marketing.

Introducing activation modification flyash, water-ground limestone mainly are the usage quantitys that reduces the polyethylene raw material among the present invention, reduce material cost; Quoting whisker mainly is that it is evenly distributed between polyethylene molecule and the rigid particles, increases interaction force between the molecule, improves the rigidity of material.Maleic anhydride grafted polyethylene mainly is the consistency that improves between inorganic particulate such as flyash and water-ground limestone and the vinyon; Quoting lubricant mainly is the moulding processability that improves formulation material, just extrusion moulding.

Embodiment:

Below by embodiment the present invention is further specified.

Method one, A, mixing: flyash, water-ground limestone, whisker are put into high mixer after 8 minutes cold mixing, obtain finely dispersed powder; B, high mixing: HDPE polyethylene, maleic anhydride grafted polyethylene, lubricant are stirred in high mixer, be heated to 110 ℃ when stirring, then steps A is obtained finely dispersed powder after mixed and adds in the high mixer through high mixer is cold, obtain particulate mixtures after 8 minutes at high mixer high speed (2000 rev/mins) premix; C, mixing: the granular admixture material that step B obtains is delivered in the twin screw extruder, and the opening for feed temperature is 150 ℃, and the solution temperature is 210 ℃, and die temperature is that 210 ℃ temperature range is extruded PP Pipe Compound.

Composition of raw materials used in the method one is as follows respectively:

1, the raw material of this buried drain pipe polyethylene special-purpose material is made up of flyash 10%, water-ground limestone 15%, whisker 12%, maleic anhydride grafted polyethylene 2.5%, the lubricant 0.5% of polyethylene 60%, activated modification.

2, the raw material of this buried drain pipe polyethylene special-purpose material is made up of flyash 12%, water-ground limestone 10%, whisker 10%, maleic anhydride grafted polyethylene 2.5%, the lubricant 0.5% of polyethylene 65%, activated modification.

Method two, A, mixing: by weight percentage flyash, water-ground limestone, whisker are put into high mixer after 8 minutes cold mixing, obtained finely dispersed powder; B, high mixing: HDPE polyethylene, maleic anhydride grafted polyethylene, lubricant are stirred in high mixer, be heated to 115 ℃ when stirring, then steps A is obtained finely dispersed powder after mixed and adds in the high mixer through high mixer is cold, obtain particulate mixtures after 8 minutes at high mixer high speed (2000 rev/mins) premix; C, mixing: the granular admixture material that step B obtains is delivered in the twin screw extruder, and the opening for feed temperature is 155 ℃, and the solution temperature is 215 ℃, and die temperature is that 215 ℃ temperature range is extruded PP Pipe Compound.

Composition of raw materials used in the method two is as follows respectively:

1, the raw material of this buried drain pipe polyethylene special-purpose material is made up of flyash 15%, water-ground limestone 5%, whisker 12%, maleic anhydride grafted polyethylene 3%, the lubricant 0.5% of polyethylene 64.5%, activated modification.

2, the raw material of this buried drain pipe polyethylene special-purpose material is made up of flyash 10%, water-ground limestone 15%, whisker 11%, maleic anhydride grafted polyethylene 3%, the lubricant 1% of polyethylene 60%, activated modification.

Method three, A, mixing: by weight percentage flyash, water-ground limestone, whisker are put into high mixer after 8 minutes cold mixing, obtained finely dispersed powder; B, high mixing: HDPE polyethylene, maleic anhydride grafted polyethylene, lubricant are stirred in high mixer, be heated to 120 ℃ when stirring, then steps A is obtained finely dispersed powder after mixed and adds in the high mixer through high mixer is cold, obtain particulate mixtures after 8 minutes at high mixer high speed (2000 rev/mins) premix; C, mixing: the granular admixture material that step B obtains is delivered in the twin screw extruder, and the opening for feed temperature is 158 ℃, and the solution temperature is 220 ℃, and die temperature is that 216 ℃ temperature range is extruded PP Pipe Compound.

Composition of raw materials used in the method three is as follows respectively:

1, the raw material of this buried drain pipe polyethylene special-purpose material is made up of flyash 10%, water-ground limestone 10%, whisker 15%, maleic anhydride grafted polyethylene 2%, the lubricant 1% of polyethylene 62%, activated modification.

2, the raw material of this buried drain pipe polyethylene special-purpose material is made up of flyash 10%, water-ground limestone 5%, whisker 10%, maleic anhydride grafted polyethylene 2%, the lubricant 0.5% of polyethylene 72.5%, activated modification.

3, the raw material of this buried drain pipe polyethylene special-purpose material is made up of flyash 10%, water-ground limestone 10%, whisker 8%, maleic anhydride grafted polyethylene 2%, the lubricant 0.5% of polyethylene 69.5%, activated modification.

Adopt following testing method to detect to above-mentioned 7 kinds of prepared PP Pipe Compound of method: melt index adopts the method for GB/T3682-2000 regulation to measure, and tensile property is pressed the method for GB/T1040-92 regulation and measured, and draw speed is 50mm/min; Bending property is pressed the method for GB/T9431-2000 regulation and is measured, and the various performance parameters that records sees Table 1:

Table 1

Embodiment	Melt index (190,5Kg)	Tensile strength (MPa)	Shock strength (KJ/m 2)	Flexural strength (MPa)	Modulus in flexure (MPa)
						Unmodified polyethylene	0.5	23.5	39	21	850
1	0.52	28.0	30.5	27.8	1850
						2	0.55	26.5	35.4	26.5	1800
3	0.56	27.5	38.6	28	1950
						4	0.55	29.5	38	31.5	2000
5	0.62	27.2	41	25.8	1760
						6	0.58	26.8	39.2	29	1900
7	0.48	29.0	31.2	29.5	1950

Can get from last table analysis: starting material buried drain pipe of the present invention has favorable rigidity, and the anti-cracking performance of tubing, resistance to pressure, stability all make moderate progress, erosion resistance is strong, the characteristics of long service life, and the cost of tubing significantly reduces.

Used in the above-described embodiments polyethylene: select the big forest products PE80 of Korea S level polyethylene for use, the trade mark is 4100 or TR480, its salient features is: density: 0.948, melt flow index: 0.55 (5 kilograms), tensile strength＞25.5Mpa, elongation at break:＞600%, environmental stress cracking＞3000 hour, shock strength (23 ℃)＞30Mpa; Flyash: develop by silane coupling agent KH590 modification; (granularity is in the oven dry of 0.001mm～0.1mm) with the flyash of screening, join in the high-speed mixer, spray into silane coupling agent KH590 (with alcohol dilution) while stirring, high-speed stirring 10～15 minutes, make it the thorough mixing activation, promptly get activatory flyash 95～100 ℃ of oven dry; Lime carbonate: adopt the water-ground limestone after surface treatment, median size is at 0.001mm～0.03mm; Whisker: adopt anhydrous calcium sulfate whisker, its length (um): 50-200; Diameter (um): 0.2-4.0; Maleic anhydride grafted polyethylene adopts maleic anhydride graft high density polyethylene(HDPE) (the ST-g-HDPE product is get by high density polyethylene(HDPE) (HDPE) grafted with maleic anhydride), selects the grand refined chemical materials of the general victory in Beijing limited liability company production for use; Lubricant is selected the Shanghai Long March second chemical plant for use, and the trade mark is the lubricant of EBS.

Claims (1)

1, a kind of preparation method of special material for buried polyethylene drainage pipe, its step is as follows:

A, mixing: by weight percentage modified coal ash 10～15%, water-ground limestone 5～15%, whisker 8～15% are put into high mixer after 5～10 minutes cold mixing, obtained finely dispersed powder;

B, high mixing: by weight percentage HDPE polyethylene 60～72.5%, maleic anhydride grafted polyethylene 2～3%, lubricant 0.5～1% are put into high mixer and stirred, be heated to 100～120 ℃ when stirring, then steps A is obtained finely dispersed powder after mixed and adds in the high mixer through high mixer is cold, obtain particulate mixtures at premix under 2000 rev/mins the condition after 5～10 minutes at the high mixer medium speed;

C, mixing: the granular admixture material that step B obtains is delivered in the twin screw extruder, and the opening for feed temperature is 150～160 ℃, and melt temperature is 200～220 ℃, and die temperature is that 200～210 ℃ temperature range is extruded PP Pipe Compound.