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Method for preparing high-rigidity chlorinated polyethylene

A technology of chlorinated polyethylene and high-density polyethylene, which is applied in the field of producing high-rigidity chlorinated polyethylene by the hydrochloric acid phase method, can solve the problems of product competitiveness decline, product rigidity, and poor weather resistance of MBS, so as to reduce production costs, Improved processability and thorough separation

Active Publication Date: 2010-04-28
WEIFANG YAXING GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chlorinated polyethylene is used for profile modification and is widely used, but it is used in the field of rigid pipes and is rarely used in urban water supply and drainage
The reason is that chlorinated polyethylene is obtained by chlorination of high-density polyethylene. The product obtained after chlorination has a flexible molecular segment, which can better improve the toughness of rigid plastics such as PVC, but low modulus and low hardness will Reduce the rigidity of the product, resulting in a decrease in the ring rigidity and compressive strength of the pipe product, and the use is limited
[0004] In order to ensure the rigidity of the pipe, in the current processing process, the terpolymer (MBS) of methyl acrylate, butadiene and styrene is mostly used as the impact modifier, but adding MBS as the impact modifier in The following problems exist in actual production: first, the processing torque of MBS is high, and the energy consumption in the production process increases; second, the price of MBS is high, the production cost of manufacturing enterprises increases, and the competitiveness of products decreases; Products are used, so the use of MBS in pipes is subject to certain limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] a. Preparation of suspension solution: Add 80L of 15% hydrochloric acid solution into a 100L acid-resistant reactor, and add a solution with a melt index MI (190°C / 5kg) = 0.2-1.0g / 10min and an MFR of 10-30 under stirring. 10kg of high-density polyethylene, 0.008kg of dispersant alkylphenol polyoxyethylene ether, and 0.016kg of anti-sticking agent talcum powder were stirred evenly to prepare a suspension solution, and then the acid-resistant reaction kettle was sealed.

[0026] b, chlorination reaction: feed chlorine into the suspension solution in two stages to carry out chlorination reaction:

[0027] Heating section: the initial chlorine flow temperature is controlled at 90°C, and the temperature is gradually raised to 135°C, and the chlorine flow rate in the heating section is 3.1kg;

[0028] Constant temperature section: the temperature in the constant temperature section is controlled at 135°C, the temperature is kept constant, and the chlorine flow rate is 4.5kg; ...

Embodiment 2

[0032] a. Preparation of suspension solution: Add 4000L of 10% hydrochloric acid solution into a 5000L acid-resistant reactor, and add a solution with a melt index MI (190°C / 5kg) = 0.2-1.0g / 10min and an MFR of 10-30 under stirring. 400kg of high-density polyethylene, 1.0kg of dispersant fatty alcohol polyoxyethylene ether, and 2.0kg of anti-sticking agent white carbon black were stirred evenly to obtain a suspension solution, and then the acid-resistant reactor was sealed.

[0033] b, chlorination reaction: feed chlorine into the suspension solution in two stages to carry out chlorination reaction:

[0034] Heating section: the initial chlorine flow temperature is controlled at 75°C, and the temperature is gradually raised to 130°C, and the chlorine flow rate in the heating section is 220kg;

[0035] Constant temperature section: the temperature in the constant temperature section is controlled at 130°C, the temperature is kept constant, and the chlorine flow rate is 220kg;

...

Embodiment 3

[0039] a. Preparation of suspension solution: Add 8700L of 17% hydrochloric acid solution into a 12500L acid-resistant reactor, and add a solution with a melt index MI (190°C / 5kg) = 0.2-1.0g / 10min and an MFR of 10-30 under stirring. 1300kg of high-density polyethylene, 1.6kg of dispersant polyvinylpyrrolidone, and 2kg of anti-sticking agent D17 were stirred evenly to obtain a suspension solution, and then the acid-resistant reactor was sealed.

[0040] b, chlorination reaction: feed chlorine into the suspension solution in two stages to carry out chlorination reaction:

[0041] Heating section: the initial temperature of chlorine flow is controlled at 60°C, and the temperature is gradually raised to 130°C, and the amount of chlorine flow in the heating section is 780kg;

[0042] Constant temperature section: the temperature in the constant temperature section is controlled at 130°C, the temperature is kept constant, and the chlorine flow rate is 520kg;

[0043] During the who...

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Abstract

The invention discloses a method for preparing high-rigidity chlorinated polyethylene by using a hydrochloric acid phase process, which comprises the following steps: adding high-density polyethylene, dispersing agent and anti-adhesion agent in hydrochloric acid solution in a stirring state to prepare suspension; feeding in chlorine into the suspension in two stages for implementing chlorination reaction, with the reaction temperature being from 30 to 140 DEG C, the reaction time being from 3-5 hours and the feed-in amount of the chlorine being 0.5-1.2 times as large as the weight of the high-density polyethylene; afterwards, separating, washing, dehydrating and drying the chlorinated products to result in the high-rigidity chlorinated polyethylene product with 20-35wt% of the chlorine content, DSC which is not more than 5J / g, 60-80 of Shore hardness and more than 2.0MPa of 100% modulus at definite elongation. The high-rigidity chlorinated polyethylene prepared according to the method can take the place of high-price MBS to serve as an anti-impact modifier of hard PVC articles and meet the demands of materials about rigidness and toughness.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a method for producing high-rigidity chlorinated polyethylene by a hydrochloric acid phase method. Background technique [0002] Polyvinyl chloride (PVC) is one of the most widely used general-purpose plastics and occupies a very important position in material engineering. It has excellent mechanical properties and is widely used. However, PVC is a hard and brittle material with low impact strength and poor low-temperature toughness. Therefore, during the processing of PVC, it is necessary to add impact modifiers to improve product toughness and expand product applications. In recent years, in rigid PVC products such as PVC pipes and profiles, commonly used modifiers include chlorinated polyethylene (CPE), acrylonitrile-butadiene-styrene copolymer (ABS), methyl acrylate-butanediene ethylene-styrene terpolymer (MBS), ethylene-ethyl acetate copolymer (EVA), acrylic copol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F8/22
Inventor 杨雷刘建平孙岩韩风范晓祥董祥德姜铁竹
Owner WEIFANG YAXING GRP CO LTD
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