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A kind of thermoplastic and preparation method thereof

A technology of thermoplastics and water-soluble initiators, applied in the field of thermoplastics, can solve the problems of poor heat resistance, high rigidity, and high glass transition temperature, and achieve the effects of low latex viscosity, high rigidity, and high product rigidity

Active Publication Date: 2016-05-04
HANGZHOU HIWETECH CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The plastic is a copolymer of styrene and γ-methyl-α-methylene-γ-butyrolactone, and its glass transition temperature is much higher than 100°C, which solves the defect of PS’s poor heat resistance. In addition, the rigidity of the product High, it is expected to be used in the fields of high heat-resistant thermoplastics such as plastic substrates of electronic display instruments, fuel cell composite materials, boiling water containers, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 (feed monomer composition (molar ratio) [MeMBL]:[St]=1:4):

[0025] In the reactor, 0.24 parts by weight of sodium lauryl sulfate is dissolved in 50 parts by weight of water to form a water phase, and then the oil phase consisting of 9.98 parts by weight of St and 2.69 parts by weight of MeMBL is poured into the water phase and stirred, Raise the temperature of the reactor to 70°C, heat and stir, pass nitrogen and deoxygenate for 30 minutes, add 0.02 parts by weight of potassium persulfate, and react for 60 minutes to obtain a MeMBL-co-St polymer emulsion, which is added dropwise to a mass concentration of 7 % hydrochloric acid aqueous solution to break the emulsification, remove the water by suction filtration, and vacuum-dry the filter cake at 120°C for 24 hours to obtain a thermoplastic product.

[0026] The conversion rate of the monomer is 99%, the particle size of the emulsion latex is 124nm, the glass transition temperature of the polymer is 121°C, the ...

Embodiment 2

[0027] Example 2 (feeding monomer composition (molar ratio) [MeMBL]:[St]=1:2):

[0028] In the reactor, 0.3 parts by weight of sodium dodecylsulfonate was dissolved in 50 parts by weight of water to form a water phase, and then the oil phase composed of 8.32 parts by weight of St and 4.48 parts by weight of MeMBL was poured into the water phase and stirred and mixed . Raise the temperature of the reactor to 60°C, heat and stir, pass nitrogen and deoxygenate for 20 minutes, add 0.04 parts by weight of ammonium persulfate, and react for 80 minutes to obtain a MeMBL-co-St polymer emulsion, which is added to anhydrous methanol Stir to break the emulsion, remove water by suction filtration, and vacuum-dry the filter cake at 140°C for 20 hours to obtain a thermoplastic product.

[0029] The conversion rate of the monomer is 100%, the particle size of the emulsion latex is 118nm, the glass transition temperature of the polymer is 138°C, the elastic modulus of the thermoplastic produ...

Embodiment 3

[0030] Example 3 (feeding monomer composition (molar ratio) [MeMBL]:[St]=1:1):

[0031] In the reactor, 0.4 parts by weight of sodium lauryl sulfate was dissolved in 50 parts by weight of water to form a water phase, and then the oil phase consisting of 6.24 parts by weight of St and 6.72 parts by weight of MeMBL was poured into the water phase and stirred and mixed. Raise the temperature of the reactor to 80°C, heat and stir, pass nitrogen and deoxygenate for 10 minutes, add 0.02 parts by weight of sodium persulfate, and react for 40 minutes to obtain a MeMBL-co-St polymer emulsion, which is added dropwise to a mass concentration of 15 % sodium chloride aqueous solution to break the emulsification, remove the water by suction filtration, and vacuum-dry the filter cake at 160°C for 30 hours to obtain a thermoplastic product.

[0032] The conversion rate of the monomer is 100%, the particle size of the emulsion latex is 126nm, the glass transition temperature of the polymer is ...

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Abstract

The invention discloses a thermoplastic plastic. The structural formula of the thermoplastic plastic is MeMBL-co-St, wherein MeMBL is a game-methyl-alpha-methylene-gamma-butyrolactone monomer unit and St is a styrene monomer unit; the thermoplastic plastic is prepared through the polymerization of the MeMBL and the St, and the mass ratio of the MeMBL to the St is 1: (0.5-4); water is taken as a dispersion medium of the thermoplastic plastic, and the dispersion medium is advantageous for heat transfer, environmental friendly and safe, and the emulsion is low in viscosity, which is convenient to pipeline delivery and continuous production; the monomers are high in reaction speed and high in final conversion rate, so that the production efficiency can be improved; the glass transition temperature of a copolymer prepared by the method is higher than 100 DEG C, and the product is high in rigidity and has wide application prospect in the high-thermal stability plastic field, such as the plastic substrates of electronic display instruments, fuel cell composite materials and boiled water resistant containers.

Description

(1) Technical field [0001] The invention relates to a thermoplastic, in particular to a method for preparing a thermoplastic with a glass transition temperature higher than 100°C by emulsion polymerization. (2) Background technology [0002] Thermoplastics refer to a class of plastics that can soften and flow when heated, and can be plasticized and formed after cooling. It has excellent processing properties and is widely used. As one of the five general-purpose plastics, polystyrene (PS) is one of the most market-attractive thermoplastics due to its low price, strong mechanical rigidity, and high optical transparency. However, PS has poor chemical stability, intolerant to organic solvents, and low glass transition temperature (about 100 °C), which limits its application in the field of high heat resistance. [0003] On the other hand, with the increasing depletion of petroleum resources, the development and utilization of renewable resources is becoming more and more impo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/08C08F220/16C08F2/26C08F4/04C08F4/30C08F6/22
Inventor 许华君许少宏
Owner HANGZHOU HIWETECH CHEM TECH CO LTD
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