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A technology of methyl methacrylate and a production method, which is applied in the chemical industry, can solve the problems of multiple dimers, and achieve the effects of reducing the generation of dimers, stabilizing performance, and shortening the residence time of polymerization
Active Publication Date: 2020-07-07
PETROCHINA CO LTD
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[0013] The main purpose of the present application is to provide a method for preparing methyl methacrylate polymers, to solve the problem that the production method in the prior art produces more dimers during the production process
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Embodiment 1
[0060] The preparation method of methyl methacrylate polymer specifically comprises:
[0061] First, the fully mixed reactor was purged with nitrogen.
[0062] Second, a gap reaction is performed.
[0063] Next, add to the reactor the polymerization liquid that comprises the first polymerized monomer, the first initiator and the first chain transfer agent, and the first polymerized monomer is 100 parts, specifically including 90 parts of the first main monomer and 10 parts of the first comonomer, wherein the first main monomer is ethyl methacrylate, and the first comonomer is methyl acrylate. The first initiator is tert-butyl peroxyacetate, and its weight part is 0.0025 part. The first chain transfer agent is 0.01 part, and is specifically n-butyl mercaptan.
[0064] The temperature in the reactor was controlled to 150° C., the pressure was controlled to 0.6 MPa, and batch polymerization was carried out.
[0065] Again, continuous polymerization was carried out.
[0066] ...
Embodiment 2
[0072] The difference from Example 1 is that the second initiator is 0.041 parts of 1,1-bis(tert-amylperoxy)cyclohexane, the feeding rate of the initiator liquid is 1.9g / min, and the polymerization temperature is 150°C. The pressure is 0.5 MPa, and during the continuous polymerization reaction, the average residence time of the controlled polymerization is 126 minutes.
Embodiment 3
[0074] The difference with Example 1 is: the second initiator is 0.042 parts of peroxy (2-ethylhexyl) tert-amyl carbonate, the feed rate of the initiator feed solution is 2.2g / min, and the polymerization temperature is 160°C, continuous During the polymerization reaction, the average residence time of the controlled polymerization was 120 min.
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Abstract
The invention provides a preparation method of a methyl methacrylate polymer. The preparation method comprises the following steps: intermittently adding polymerization feed liquid into a reactor, andcarrying out intermittent polymerization reaction, wherein the polymerization feed liquid comprises a first polymerization monomer and a first initiator; and continuously adding a mixture of a polymeric monomer feed liquid and an initiator feed liquid into the reactor, and carrying out a continuous polymerization reaction to obtain the methyl methacrylate polymer, the polymeric monomer feed liquid comprising a second polymeric monomer, and the initiator feed liquid comprising a third polymeric monomer and a second initiator. The preparation method can realize stable operation of bulk polymerization; according to the present invention, the high polymerization conversion rate of 45-75% can be obtained at the low polymerization temperature by using the low addition amount of the initiator, the polymerization residence time is shortened to 120-150 min, the production efficiency is improved, the generation of the dimer is reduced, the content of the dimer in the polymer is less than 1%, and the high-purity polymer is obtained.
Description
technical field [0001] This application relates to the field of chemical industry, in particular, to a method for preparing methyl methacrylate polymer. Background technique [0002] Methyl methacrylate polymer (mostly called PMMA) is a transparent material with excellent comprehensive properties. It has excellent light transmission, apparent gloss, excellent weather resistance and good post-processing performance. It is widely used In the fields of automobile, construction, advertisement, medicine, communication, electronics and so on. [0003] The rapid development of domestic liquid crystal display LCD manufacturing technology has driven the rapid growth of the consumption of PMMA light guide plate materials, and optical grade PMMA has become the most growing high value-added polymer material. With the wide application of PMMA in optical display materials and plastic optical fibers, higher requirements are put forward for the purity and optical performance of PMMA produc...
Claims
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