Methyl methacrylate polymer and preparation method thereof

A technology of methyl methacrylate and polymers, which is applied in the field of methyl methacrylate polymers and its preparation, can solve the problems of restricting applications and affecting the optical properties of polymers, achieve large loss of mechanical properties, and solve processing fluidity Effect on heat resistance/mechanical strength

Active Publication Date: 2019-12-27
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this technical solution is that cross-linked polymers may be produced after adding bi / multifunctional monomers to the reaction system, which affects the optical properties of the polymers and limits its application

Method used

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  • Methyl methacrylate polymer and preparation method thereof
  • Methyl methacrylate polymer and preparation method thereof
  • Methyl methacrylate polymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Add 99 parts by mass of methyl methacrylate (MMA) in the batching tank, 1 part by mass of methyl acrylate (MA), 0.3 parts by mass of n-octyl mercaptan, and the initiator ATA-1 and the total monomer mass ratio of 100ppm 50ppm initiator 2,2-bis(tert-butylperoxy)butane (ATB, two peroxygen bonds on the molecule have a half-life of 6 minutes at 135°C, the same below), and blow nitrogen until the oxygen concentration is lower than 1ppm.

[0091] The above materials are continuously conveyed to a full-mixed flow polymerization kettle. Control the temperature in the first-stage kettle to 135° C., and the average residence time of the materials is 2 hours to obtain a first-stage slurry. The first-stage slurry is continuously poured into the second-stage full-mixed flow polymerization kettle, the temperature in the second-stage kettle is controlled at 170° C., and the average residence time of the material is 1 hour to obtain the second-stage slurry.

[0092] The slurry obtained...

Embodiment 2

[0094] Add 99.5 parts by mass of methyl methacrylate (MMA) in the batching tank, 0.5 parts by mass of methyl acrylate (MA), 0.28 parts by mass of n-octyl mercaptan, and the initiator ATA-1 and the total monomer mass ratio of 90ppm 60ppm of initiator 2,2-bis(tert-butylperoxy)butane (initiator ATB), and pass nitrogen until the oxygen concentration is lower than 1ppm.

[0095] The above materials are continuously conveyed to a full-mixed flow polymerization kettle. Control the temperature in the first-stage kettle to 135° C., and the average residence time of the materials is 2 hours to obtain a first-stage slurry. The first-stage slurry is continuously poured into the second-stage full-mixed flow polymerization kettle, the temperature in the second-stage kettle is controlled at 170° C., and the average residence time of the material is 1 hour to obtain the second-stage slurry.

[0096] The slurry obtained by the above method is continuously conveyed into a screw extruder, and a...

Embodiment 3

[0098] Add 99 parts by mass of methyl methacrylate (MMA) in the batching tank, 1 part by mass of methyl acrylate (MA), 0.32 parts by mass of n-octyl mercaptan, and the initiator ATA-1 of 107ppm with the total monomer mass ratio 43ppm of initiator 2,2-bis(tert-butylperoxy)butane (initiator ATB), nitrogen flow to oxygen concentration lower than 1ppm.

[0099] The above materials are continuously conveyed to a full-mixed flow polymerization kettle. Control the temperature in the first-stage kettle to 135° C., and the average residence time of the materials is 2 hours to obtain a first-stage slurry. The first-stage slurry is continuously poured into the second-stage full-mixed flow polymerization kettle, the temperature in the second-stage kettle is controlled at 170° C., and the average residence time of the material is 1 hour to obtain the second-stage slurry.

[0100] The slurry obtained by the above method is continuously conveyed into a screw extruder, and after devolatiliza...

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Abstract

The invention discloses a methyl methacrylate polymer and a preparation method thereof. The methyl methacrylate polymer disclosed by the invention is mainly prepared by carrying out continuous bulk polymerization on 97-99.9 parts by mass of methyl methacrylate and 0.1-3 parts by mass of a comonomer. The polymer with certain molecular weight distribution is prepared by selecting a composite initiating system consisting of two bifunctional initiators with different molecular structures and controlling the ratio of the two initiators. By adopting the method provided by the invention, the processing fluidity of resin can be improved under the condition of keeping the heat resistance and other application performances of the methyl methacrylate polymer basically unchanged.

Description

technical field [0001] The present invention relates to a kind of methyl methacrylate polymer and preparation method thereof, particularly a kind of way that adopts the combination of difunctional initiators of different structures to prepare the methyl methacrylate polymer of certain molecular weight distribution, and then in basic A method of improving the processing fluidity of polymers without compromising other application properties. Background technique [0002] Methyl methacrylate polymer, namely polymethyl methacrylate (PMMA), is a polymer formed by copolymerization of methyl methacrylate as the main monomer and other monomers. It has many excellent properties, Such as high light transmittance, good weather resistance, surface hardness, dimensional stability, and good electrical insulation. Therefore, it is widely used in automobiles, displays, electronic appliances, lighting, billboards and other fields. [0003] For applications such as automobiles and lighting,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F4/38
CPCC08F220/14C08F4/38
Inventor 刘波刘铭黄岐善
Owner WANHUA CHEM GRP CO LTD
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