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Method for preparing high-density polyethylene-maleic anhydride grafted copolymer by adopting suspension method

A high-density polyethylene and graft copolymer technology, applied in the direction of graft polymer adhesives, adhesive types, adhesives, etc., can solve the problems of high equipment requirements, high cross-linking degree, and low grafting rate , to achieve the effects of reducing production costs, improving compatibility, and high product purity

Active Publication Date: 2015-04-01
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The melt grafting process is simple and easy to produce continuously, but there are disadvantages such as low grafting rate, serious side reactions, high degree of crosslinking, and difficulty in removing remaining unreacted monomers; although the grafting rate of solution grafting is high, the organic waste The liquid volume is large and recovery is difficult; the solid-phase grafting process is relatively simple, but the grafting rate is not high, and the requirements for equipment are very high
Therefore, solution grafting and solid phase grafting methods are not easy for large-scale production, while plasma and radiation grafting methods are limited to the surface functionalization of HDPE products, so it is necessary to develop a new preparation method to solve the problems in the above methods. problems and deficiencies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A) Add 310g HDPE, 1.16L of xylene, 300gMAH, 3.5L of water, 4g of surfactant and 3g of interface agent into the autoclave, stir and heat up to 130°C to maintain the reaction temperature;

[0024] B) Dissolve 19g TBPB in 50mL xylene and divide it into 10 parts on average, use a constant pressure dropping funnel according to the function formula t=3.41n 2 -10.7n+7.29 regular addition (t is the time from the beginning of the reaction, n is the sequence number of dropping) reactor, reacted for 5 hours;

[0025] C) After the reaction, cool to 90°C, take out the product and suction filter, wash, purify and dry for later use;

[0026] D) Determining various properties of the product, the obtained HDPE-g-MAH has a grafting rate of 2.0%wt, a degree of crosslinking of 0, and residual MAH in the product of 5ppm.

Embodiment 2

[0028] A) Add 310g HDPE, 1.16L of xylene, 300gMAH, 3.5L of water, 4g of surfactant and 3g of interface agent into the autoclave, stir and heat up to 130°C to maintain the reaction temperature;

[0029] B) Dissolve 19gBPO in 50mL xylene and divide it into 10 parts on average, and use a constant pressure dropping funnel according to the function formula t=3.41n 2 -10.7n+7.29 regular addition (t is the time from the beginning of the reaction, n is the sequence number of dropping) reactor, reacted for 5 hours;

[0030] C) After the reaction, cool to 80°C, take out the product and suction filter, wash, purify and dry for later use;

[0031] D) Determining various properties of the product, the obtained HDPE-g-MAH has a grafting rate of 1.6%wt, a degree of crosslinking of 0, and a residual MAH of 7ppm in the product.

Embodiment 3

[0033] A) Add 310g HDPE, 1.16L of xylene, 300gMAH, 3.5L of water, 4g of surfactant and 3g of interface agent into the autoclave, stir and heat up to 130°C to maintain the reaction temperature;

[0034] B) Dissolve 19g TBPB in 50mL xylene and divide it into 10 parts on average, use a constant pressure dropping funnel according to the function formula t=3.41n 2 -10.7n+7.29 regular addition (t is the time from the beginning of the reaction, n is the sequence number of dropping) reactor, reacted for 3 hours;

[0035] C) After the reaction is finished, cool to 90°C, take out the product and suction filter, wash, dry and set aside;

[0036] D) Determining various properties of the product, the obtained HDPE-g-MAH has a graft rate of 1.4%wt, a degree of crosslinking of 0, and residual MAH in the product of 8ppm.

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Abstract

The invention discloses a method for preparing a high-density polyethylene-maleic anhydride grafted copolymer adopting a suspension method. The polymer prepared by the method has high grafted rate, less solvent is used, the content of a cross-linking substance tends to zero, simple equipment and process are adopted, and the polymer is convenient to produce in a large scale. According to the grafting method for grafting maleic anhydride (MAH) to high-density polyethylene (HDPE), the grafting reaction is carried out in a high-pressure reactor by adopting a suspension polymerization method by adding the HDPE and swelling agent thereof, the MAH, an interface agent, a surfactant and water in the high-pressure reactor, stirring, increasing temperature to fuse the HDPE, and dropwise adding an initiating agent to carry out a suspension grafting reaction, wherein the initiating agent is dispersed in the swelling agent of the HDPE first.

Description

technical field [0001] The invention relates to a method for preparing a graft copolymer, in particular to a method for preparing a high-density polyethylene-maleic anhydride graft copolymer by a suspension method, and the invention belongs to the technical field of polymer material modification. Background technique [0002] High-density polyethylene (HDPE) is a general-purpose plastic with a wide range of uses. Because of its low price, high crystallinity, and good comprehensive performance, it is widely used in the production of various living utensils and industrial devices. However, HDPE with low polarity has poor adhesion to other materials and poor compatibility with polar polymers, which greatly limits its application range. In order to improve the performance of HDPE and expand the scope of application, graft copolymerization with other polar monomers can be carried out to prepare functionalized HDPE with polar groups. These comonomers are: MAH (maleic anhydride),...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/02C08F2/18C09J151/06C08L23/06C08L51/06
Inventor 魏无际韦亚兵范海兵杨浦冬刘津瑞陈歧国刘玉东
Owner NANJING TECH UNIV
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