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Preparation method of heat-proof modifier for uniform copolymerization

A heat-resistant modifier and uniform technology, applied in the field of resin modifier preparation, can solve the problems affecting polymer gloss and aging resistance, and achieve fast polymerization rate, good compatibility, and uniform copolymerization composition. Effect

Inactive Publication Date: 2008-10-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the initiation system is controlled by diffusion, and the polymerization rate is not as good as that of the water-soluble initiator system. It is difficult for the monomer to react completely. If you want to complete the reaction, you must add more ferrous salts. Excessive iron ions remain in the polymer body, affecting the polymer. Gloss and aging resistance

Method used

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  • Preparation method of heat-proof modifier for uniform copolymerization
  • Preparation method of heat-proof modifier for uniform copolymerization
  • Preparation method of heat-proof modifier for uniform copolymerization

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0063] Add 200g of deionized water, 4g of sodium lauryl sulfate, 0.15g of potassium persulfate, 0.01g of dodecyl mercaptan, 20g of α-methylstyrene, and 30g of acrylonitrile into a 500mL reactor, and fill with nitrogen and exhaust oxygen. , stir to make it evenly mixed to form a stable emulsion. The temperature was raised to 75°C, and a solution containing 10g of N-phenylmaleimide and 40g of styrene was added dropwise at a rate of 15mL / h for 3.5h, keeping the reaction temperature at 75°C. After the dropwise addition was completed, the reaction was continued for 1 h, and the temperature was raised to 85° C. for aging for 2 h. After the reaction, use 3mmol / L aluminum sulfate solution at 90°C to break the emulsion, wash and dry to obtain a white powdery polymer with a conversion rate of over 99% and a glass transition temperature of 140°C.

specific Embodiment 2

[0079] Add 200g of deionized water, 2g of sodium dodecylbenzenesulfonate, 0.5g of ammonium persulfate, 0.2g of dodecyl mercaptan, 20g of α-methylstyrene, and 20g of styrene into a 500mL reactor, and fill with nitrogen Oxygen release, stirring to make it evenly mixed to form a stable emulsion. The temperature was raised to 75°C, and a solution containing 10g of N-cyclohexylmaleimide, 20g of styrene, and 30g of methyl methacrylate was added dropwise at a rate of 15mL / h for 4 hours, and the reaction temperature was kept at 75°C. After the dropwise addition was completed, the reaction was continued for 1 h, and the temperature was raised to 85° C. for aging for 2 h. After the reaction, use 3mmol / L aluminum sulfate solution at 90°C to break the emulsion, wash and dry to obtain a white powdery polymer with a conversion rate of over 99% and a glass transition temperature of 139°C.

specific Embodiment 3

[0083] Add 200g of deionized water, 0.8g of sodium lauryl sulfate, 0.1g of potassium persulfate, 0.1g of carbon tetrachloride, 2g of α-methylstyrene, and 3g of acrylonitrile into a 500mL reactor, fill with nitrogen and exhaust oxygen, Stir to mix well to form a stable emulsion. The temperature was raised to 80°C, and a solution containing 1g of N-phenylmaleimide and 4g of styrene was added dropwise at a rate of 5mL / h for 1h, and the reaction temperature was kept at 80°C. After the dropwise addition was completed, the reaction was continued for 4 hours, and the temperature was raised to 95°C for aging for 2 hours. After the reaction, use 90°C 3mmol / L aluminum sulfate solution to break the emulsion, wash and dry to obtain a white powdery polymer with a conversion rate of about 80% and a glass transition temperature of 134°C.

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Abstract

The invention discloses a preparation method for resin modifier, which comprises: mixing all the low-active monomers, part high-active monomers, emlsifier, initiator, modecular weight regulator and water in reaction kettle to form stable emulsion protected by inert gas; adding in turn the residual high-active monomer; aging, breaking the emulsion with aluminum sulfate, cleaning, and drying. This method can full play the heat-resisting monomer function, has quick polymerization speed and high conversion.

Description

technical field [0001] The invention relates to a preparation method of a resin modifier, in particular to a preparation method of a heat-resistant modifier with uniform copolymerization composition. Background technique [0002] General-purpose resins generally have the defect of poor heat resistance. For the heat-resistant modification of general-purpose resins, there are many methods in patents and literatures. Blending heat-resistant modifiers with general-purpose resins is one of the most commonly used methods. It can Combining the properties of the modifier and the matrix resin, an ideal polymer material can be obtained. [0003] Traditional heat-resistant modifiers such as ABS, MBS, PMMA, SAN and other heat-resistant modification effects are not obvious. For this reason, people have developed a maleimide-type polymer heat-resistant modifier. The α, β-unsaturated imide ring structure in the heat-resistant component maleimide monomer can effectively limit the large Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/12C08F220/10
Inventor 单国荣
Owner ZHEJIANG UNIV
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