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Preparation of chlorinated polythylene

A technology of chlorinated polyethylene and polyvinylpyrrolidone, which is applied in the field of preparation of chlorinated polyethylene and can solve the problems of impact resistance, reduction of elasticity and flexibility, etc.

Inactive Publication Date: 2009-10-21
HEBEI JINGXIN CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, if the distribution of chlorine atoms on the CPE molecular chain links is more uniform, the elasticity and softness of chlorinated polyethylene will be better, but if the distribution of chlorine atoms is too uniform, the gap between CPE and PVC will be caused by the complete dissolution. The interface disappears and the chlorinated polyethylene loses the effect of the elastomer and becomes pure rubber, so that the chlorinated polyethylene is too soft and affects its impact resistance; if the distribution of chlorine atoms is too uneven, the molecules of CPE Chlorinated polyethylene will become hard because of excessive crystallization, and its elasticity and flexibility will be greatly reduced

Method used

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  • Preparation of chlorinated polythylene
  • Preparation of chlorinated polythylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1 Ingredients

[0028] Add 4,500 kilograms of water to the chlorination kettle with a capacity of 6,300 liters, and add 1.6 kilograms of dioxane, 2.6 kilograms of polyvinylpyrrolidone and 8.2 kilograms of methyl acrylate-methacrylic acid copolymer to form a dispersant, The emulsifier is composed of 0.14 kg of sodium stearate, 0.48 kg of polyoxyethylene ether and 0.48 kg of polyoxyethylene castor oil and is made of 1.6 kg of dibenzoyl peroxide and 0.2 kg of cumene peroxide. Initiator, stir for 10 minutes, then add powdered high-density polyethylene resin with a particle size of 150 mesh and 600 kg to the chlorination kettle, seal the chlorination kettle and heat it up; when the temperature in the kettle rises to 65 ° C Vacuumize until boiling; then continue to heat, and when the temperature in the kettle rises to 75°C, carry out the chlorine flow operation;

[0029] The second step chlorine reaction

[0030] Feed 720 kg of chlorine gas into the chlorination kettle...

Embodiment 2

[0036] Step 1 Ingredients

[0037] Add 5000 kilograms of water to the chlorination tank with a capacity of 6300 liters, add 1.2 kilograms of dioxane, 3.6 kilograms of polyvinylpyrrolidone and 9.6 kilograms of methyl acrylate-methacrylic acid copolymer to form a dispersant, The emulsifier is composed of 0.25 kg of sodium stearate, 0.36 kg of polyoxyethylene ether and 0.62 kg of polyoxyethylene castor oil and made of 1.9 kg of dibenzoyl peroxide and 0.3 kg of cumene peroxide Initiator, stir for 15 minutes, then add powdered high-density polyethylene resin with a particle size of 50 mesh and 720 kg into the chlorination kettle, seal the chlorination kettle and heat it up; when the temperature in the kettle rises to 60 ° C Vacuumize until boiling; then continue to heat, and when the temperature in the kettle rises to 75°C, carry out the chlorine flow operation;

[0038]The second step chlorine reaction

[0039] Feed 836 kg of chlorine gas into the chlorination kettle for chlorin...

Embodiment 3

[0045] Step 1 Ingredients

[0046] Add 5000 kilograms of water to the chlorination tank with a capacity of 6300 liters, add 1.8 kilograms of dioxane, 4.0 kilograms of polyvinylpyrrolidone and 8.4 kilograms of methyl acrylate-methacrylic acid copolymer to form a dispersant, The emulsifier is composed of 0.16 kg of sodium stearate, 0.48 kg of polyoxyethylene ether and 0.64 kg of polyoxyethylene castor oil and is made of 2.2 kg of dibenzoyl peroxide and 0.2 kg of cumene peroxide. Initiator, stir for 12 minutes, then add powdered high-density polyethylene resin with a particle size of 150 mesh and 720 kg to the chlorination kettle, seal the chlorination kettle and heat it up; when the temperature in the kettle rises to 65 ° C Vacuumize until it boils; then continue to heat, and when the temperature in the kettle rises to 80°C, carry out the chlorine flow operation;

[0047] The second step chlorine reaction

[0048] Introduce 840 kg of chlorine gas into the chlorination kettle f...

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Abstract

The invention belongs to the technical field of modifiers for plastic profile products, and discloses a preparation method for PVC impact modifier chlorinated polyethylene. Its main technical features are: add dispersant, emulsifier, initiator and powdery high-density polyethylene resin to the chlorination tank with water under stirring, heat up and pass chlorine reaction three times at different temperature sections; After the completion, the wrapped HCl formed in the reaction kettle is discharged; after repeated washing with hot water, centrifugal dehydration and drying, calcium stearate, calcium carbonate and lanthanum carbonate are added, and the finished product is obtained after stirring, batch mixing and sieving. Because the high-density polyethylene resin is a high-mesh powder in the above-mentioned preparation process, it is obtained by taking a three-stage chlorine reaction. The chlorinated polyethylene prepared by this process has a higher thermal stability temperature and a lower heat of fusion; the PVC products produced by using the chlorinated polyethylene as an impact modifier for PVC products have stronger impact strength and Tensile Strength.

Description

technical field [0001] The invention relates to the technical field of polyvinyl chloride resin impact modifiers, in particular to a preparation method of chlorinated polyethylene. Background technique [0002] Chlorinated polyethylene (CPE), as an impact modifier for polyvinyl chloride (PVC) products, has become the first choice for the production of impact modifiers for polyvinyl chloride (PVC) products due to its low price and special performance. From the experience of various patents, documents, experiments, tests and production, only chlorinated polyethylene with a chlorine content of 33%-37% and a residual crystallinity below 2% meets the minimum requirements. Although the chlorinated polyethylene currently produced has met the requirements of chlorine content and residual crystallinity, the impact strength and tensile strength of polyvinyl chloride (PVC) products produced using chlorinated polyethylene as an impact modifier Strength is still on the low side. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/22C08F110/02C08L27/06C08L23/28
Inventor 张保发李莉贾东立马金峰
Owner HEBEI JINGXIN CHEM GRP CO LTD
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