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Process for synthesizing acrylic ester copolymer of ultra-high molecular mass

A technology of ultra-high molecular weight and acrylate, which is applied in the field of synthesis of ultra-high molecular weight acrylate copolymers. It can solve the problems of lower production efficiency, gel explosion, and uncontrollable reaction temperature, and achieve short reaction time and low initiation temperature. Effect

Inactive Publication Date: 2009-01-07
安丘市东海塑业有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

This method has some shortcomings. In the actual mass production of one-time feeding in large industries, the reaction temperature cannot be controlled due to the rapid heat release of the reaction, resulting in the phenomenon of "explosive gelation". In addition, the temperature is too low and the production efficiency is also reduced.

Method used

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Examples

Experimental program
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specific Embodiment approach

[0020] The following examples are used to illustrate the present invention, but the present invention should not be limited by these examples.

[0021] Weight average molecular weight (Mw) is measured by gel permeation chromatography, and can also be characterized by intrinsic viscosity;

example 1

[0023] 1) Preparation of seed emulsion: the reaction is carried out in a cubic reactor, and 200 kg of deionized water (500 kg in total) is added to the reactor, and 150 kg of ethylenically unsaturated monomer—methyl methacrylate (500 kg in total) is added into the reactor. ), all butyl acrylate 30kg and all ethyl acrylate 20kg, add emulsifier sodium cetyl benzene sulfonate 6kg, oxidant potassium persulfate 0.144kg (total amount 0.16kg), all reducing agent sodium bisulfite 0.10kg, 0.03kg of pH buffering agent sodium hydroxide, 0.000002kg of metal ion complexing agent copper sulfate and 0.000004kg of ferrous sulfate, stirring and heating up to 25°C under nitrogen protection;

[0024] 2) Segmented polymerization reaction: observe the heat released by the reaction, and when the temperature rises to 50°C, put the remaining 350kg of methyl methacrylate into 10 segments (the interval between each segment is 10 minutes, and the feeding amount of each segment is equal) into the reactor ...

example 2

[0026] 1) Preparation of seed emulsion: the reaction is carried out in a cubic reactor, and 200 kg of deionized water (500 kg in total) is added to the reactor, and 150 kg of methyl methacrylate, an ethylenically unsaturated monomer (500 kg in total), is added , all butyl acrylate 30kg and all ethyl acrylate 20kg, add emulsifier sodium lauryl sulfate 6kg, oxidant ammonium persulfate 0.144kg (total amount 0.16kg), all reducing agent sodium dithionite 0.10kg, all pH buffer Sodium hydroxide 0.03kg, add metal ion complexing agent copper sulfate 0.000002kg (all) and ferrous sulfate 0.000004kg (all), stir and heat up to 25 ℃ under nitrogen protection;

[0027] 2) Segmented polymerization reaction: observe the heat released by the reaction, and when the temperature rises to 50°C, put the remaining monomer 350kg into the reaction kettle in 5 to 30 segments (each segment is 10 minutes apart, and the feeding amount of each segment is equal) At this moment, observe that the reaction syst...

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Abstract

The invention relates to a synthesis method of acrylic ester copolymer with ultra-high molecular weight (more than 6 million). The technical problem to be solved by the invention is to provide a method with multistage reaction and higher efficiency. The method comprises the following steps: (1) preparation of a seed emulsion: adding a portion weight of water and two or more unsaturated monomers with olefinic bonds, wherein the weight ratio of water to the monomers is 1:0.6 to 1; adding an emulsifying agent and a pH buffer, and adding a portion weight of or the total weight of one or two oxidants and one or two reducers to carry out reaction completely, wherein the weight ratio of the oxidant to the reducer is 1:0.7 to 1.5; and (2) multistage polymerization reaction: adding unsaturated monomers with olefinic bonds in balancing amount in multiple stages after rising the temperature, keeping the temperature at 45 to 65 DEG C, adding the balancing amount of water in multiple stages, rising the temperature to 80 to 85 DEG C, and adding the balancing amount of the oxidant and the reducer.

Description

technical field [0001] The invention relates to the field of polymer compounds, in particular to a method for synthesizing an ultrahigh molecular weight (above 6 million) acrylate copolymer. Background technique [0002] Chinese patent document 200510105276.7 titled "Plasticizing Modifier for Polyvinyl Chloride Processing, Preparation Method and Application" discloses a plasticizing modifier-a method of polymerizing high molecular weight (high viscosity) acrylate. This method has some deficiencies. In the actual mass production of one-time feeding in large industries, the reaction temperature cannot be controlled due to the rapid heat release of the reaction, resulting in the phenomenon of "explosive gelation". In addition, the temperature is too low and the production efficiency is also reduced. Contents of the invention [0003] The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art and provide a method for synthesizi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/10C08F2/26
Inventor 郑勇
Owner 安丘市东海塑业有限公司
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