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Preparation method for polymethyl methacrylate (PMMA) resin with high thermal stability

A technology of polymethyl methacrylate and methyl methacrylate, which is applied in the field of preparation of high thermal stability polymethyl methacrylate resin, can solve the problems of harsh operating conditions, exceeding 300°C, and insufficient effects, etc. Achieve high thermal degradation resistance and improve thermal stability

Active Publication Date: 2012-02-01
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the addition of comonomers can improve its thermal stability, the effect is not very significant, and it is difficult to make the thermal degradation initiation temperature of PMMA resin exceed 300 °C
(2) Adding a free radical scavenger to inhibit the open-chain degradation reaction of PMMA resin, often this method cannot achieve sufficient results, and will cause it to be colored during processing or use
However, these methods require special catalysts and initiators, and the operating conditions are harsh, so they are not suitable for industrial production

Method used

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  • Preparation method for polymethyl methacrylate (PMMA) resin with high thermal stability
  • Preparation method for polymethyl methacrylate (PMMA) resin with high thermal stability
  • Preparation method for polymethyl methacrylate (PMMA) resin with high thermal stability

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1 A kind of preparation method of methyl methacrylate polymer (PMMA) with high thermal stability adopts continuous bulk polymerization, and steps and conditions are as follows:

[0035] A brief description of the main devices is as follows: Polymerization reactor: 10 liters, SUS304, equipped with a ribbon-type stirring paddle, a heating jacket and a built-in gas phase condenser. Devolatilization extruder: counter-rotating twin-screw extruder manufactured by Nanjing Yuesheng, with a screw diameter of 30mm and a barrel length of 2400mm. It is divided into 3 temperature control zones, and each temperature zone has 2 devolatilization ports.

[0036] The methyl methacrylate of 100 parts by weight, the initiator di-tert-butyl peroxide of 0.04 parts by weight and the chain transfer agent n-dodecyl mercaptan of 0.09 parts by weight are mixed, blow into nitrogen in the mixture to remove soluble Oxygen therein; Then, 6kg of this solution is added to 10 liters of SUS304...

Embodiment 2 to 10

[0039] Embodiment 2 to 10, condition is as table 1 and table 2; All the other are with embodiment 1.

[0040] Tables 4 and 5 show the residual volatile components, weight average molecular weight, molecular weight distribution, light transmittance and initial thermal degradation temperature in the polymer pellets after devolatilization treatment.

[0041] Examples 11-15 are a preparation method of a highly thermally stable methyl methacrylate polymer (PMMA), using solution polymerization, the conditions and steps are as shown in Table 3; the rest are the same as in Example 1.

[0042] Table 6 shows the residual volatile components, weight average molecular weight, molecular weight distribution, light transmittance and initial thermal degradation temperature in the polymer pellets after devolatilization treatment.

[0043] Table 1

[0044]

[0045]

[0046] The meanings of the abbreviations in the table are as follows: (the same below); MMA is methyl methacrylate; DBP i...

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Abstract

The invention provides a preparation method for a methyl methacrylate polymer with high thermal stability, and continuous bulk polymerization or solution polymerization is adopted in the invention. According to the invention, no free radical scavengers or cross-linking agents need to be added in the preparation method; instead, unstable structures like a head-to-head structure and a terminal unsaturated double bond in the molecular structure of the methyl methacrylate polymer is gradually eliminated by controlling polymerization temperature, devolatilization temperature, polymerization time and devolatilization time in the continuous polymerization process of methyl methacrylate, thereby achieving the goal of improving thermal stability of PMMA. Preparing a PMMA resin with the method not only enables the PMMA resin to have excellent thermal degradation resistance, but also enables other inherent excellent properties of the PMMA resin to be guaranteed. The methyl methacrylate polymer prepared by the method in the invention has high thermal degradation resistance, with a starting thermal degradation temperature being higher than 360 DEG C. With utilization of the method, light transmittance of the PMMA resin is guaranteed to be 93%, and molecular weight distribution of the PMMA resin is guaranteed to be less than 1.8, while thermal stability of the PMMA resin is improved.

Description

technical field [0001] The invention relates to a method for preparing a polymethyl methacrylate (PMMA) resin with high thermal stability. Background technique [0002] Polymethyl methacrylate (PMMA) resin is a thermoplastic used in increasing amounts. Its light transmittance is more than 10% higher than that of ordinary glass, and it is light and tough. In addition, it also has certain physical and mechanical properties, such as corrosion resistance, electrical insulation, high mechanical strength, stable size under certain conditions, and easy processing and forming, and can also be used for secondary processing such as filing and cutting. Therefore, it is widely used in various fields of the national economy such as aviation, automobiles, ships, lighting, electronics, optical instruments, meters, medical instruments, communications and stationery. Although methyl methacrylate polymer has many of the above advantages, its thermal stability is poor, and it begins to degra...

Claims

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Application Information

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IPC IPC(8): C08F220/14C08F120/14C08F2/02C08F2/06C08F2/38
Inventor 曹春雷谭志勇张会轩张子健
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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