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Active free radical starting agent and use thereof

A technology of free radicals and initiators, applied in the field of active free radical initiators, can solve problems such as low impact strength and glass transition temperature, inability to enter the automotive headlight market, water absorption limitations, etc., to reduce costs and risks performance, improvement of production competitiveness, and shortening of polymerization time

Inactive Publication Date: 2003-12-31
大世界油墨涂料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the beautiful appearance and excellent optical properties of polymethyl methacrylate molding materials, it is widely used in optical parts and consumer products, but the low impact strength and glass transition temperature and high water absorption sometimes fail limits its usefulness
In addition, the glass transition temperature of industrial polymethyl methacrylate is mostly around 100°C, while the thermal cracking temperature is only 250°C. This thermal property makes polymethyl methacrylate have a high temperature during processing. restrictions, so parts that need to involve high-temperature surface treatment or need to be exposed to high-temperature environments should not be made of polymethyl methacrylate
For example, such shortcomings have prevented polymethyl methacrylate from entering the automotive headlight market for decades

Method used

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  • Active free radical starting agent and use thereof
  • Active free radical starting agent and use thereof
  • Active free radical starting agent and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (embodiment one)-polymerization of methyl methacrylate

[0038] Take about 16 grams of methyl methacrylate monomer, about 20 grams of ε-caprolactam, and about 1.8 grams of n-dodecyl mercaptan, put them in a 2-liter reactor, and pre-polymerize at about 90 ° C for about 90 minutes. Then, pour the pre-polymer into two pieces of strengthened glass, put it in a constant temperature water tank at about 60°C until it hardens, and then you can get a transparent acrylic sheet. During the experiment, no gelation effect occurred, and no air bubbles were embedded in the acrylic plate.

[0039] Utilize thermal differential scanning card meter (DSC) and thermogravimetric analyzer (TGA) to analyze the above-mentioned polymethyl methacrylate that makes, the result is as follows Figure 8 and Figure 9 shown. Please refer to Figure 8 , where A is the heat flow curve of the polymer obtained using the initiator system of the present invention, and B is the heat flow curve of the pol...

Embodiment 2

[0040] (embodiment two)-block copolymerization of methyl methacrylate and styrene

[0041] In addition, in the present invention, after the polymer obtained by the method of Example 1 is purified, the second monomer can be continuously added into the reaction to obtain a functional block copolymer. first. Take about 15 g of the polymethyl methacrylate prepared in Example 1, dissolve it in about 50 g of toluene, add about 10 g of styrene (Styrene) monomer, react at about 90 ° C for about 6 hours, and then purify. Functional block copolymers can be obtained. The infrared spectrogram of polymethyl methacrylate and polystyrene (Polystyrene; PS) functional block copolymer obtained by the above method is as follows Figure 10 shown.

Embodiment 3

[0042] (embodiment three)-polymerization of styrene

[0043] Take about 200 grams of styrene (Styrene) monomer, about 2.5 grams of 2-pyrrolidone, and about 0.8 grams of n-dodecyl mercaptan, put them in a reactor, and carry out polymerization reaction at about 90 ° C for about 5 Hour. Then, after further purification, PS with a special functional group at the end can be obtained. No gelation occurred during this experiment.

[0044] It can be seen from the above that the application of the active free radical initiator of the present invention in ethylene polymerization can effectively reduce or control the acceleration effect caused by reaction heat, and avoid the disadvantages of the known gelation effect. Moreover, although the initial reaction rate of the present invention is lower than that of the known ones, heating can be continued during the reaction process, thus shortening the polymerization time as a whole. In addition, if it is used for polymethyl methacrylate mo...

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Abstract

The active free radical initiator includes one kind of lactam compound and one kind of thiol compound, and is used in the homopolymerization and copolymerization of ethylene monomers, such as MMA, isobutyl methacrylate, n-butyl methacrylate, acrylic acid, methacrylic acid, acrylamide, acrylonitrile, vinyl acetate and the mixture of the said monomers. The active free radical initiator has the functions of reducing agglomerating effect and raising glass transition point and thermal cracking temperature, and may be used in making high-quality polymer and lowering production cost and danger.

Description

field of invention [0001] The invention relates to an active radical initiator, in particular to an active radical initiator for polymerizing vinyl monomers and its application. Background of the invention [0002] Polymethyl methacrylate (Poly Methyl Methacrylate; PMMA), commonly known as acrylic or plexiglass, its structural formula is as follows figure 1 As shown, it has good weather resistance and gloss. Polymethyl methacrylate products and its derivatives have been widely used in automobiles, lighting, building materials, household products, sanitary equipment and electronic parts. [0003] Methyl methacrylate (MMA) is a raw material for producing polymethyl methacrylate, so-called monomer (Monomer). The general polymethyl methacrylate system utilizes the structural formula such as figure 2 Shown 2,2'-azobisisobutyronitrile (2,2'-Azobis-isobutyronitrile; AIBN for short), and structural formula such as image 3 The shown dibenzoyl peroxide (Benzoyl Peroxide; BPO for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F20/14
Inventor 胡毓祥林育葳王振乾陈志勇
Owner 大世界油墨涂料股份有限公司
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