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Method for preparing nanosilicon dioxide modified styrene-butadiene latex

A technology of nano-silica and styrene-butadiene latex, which is applied in the field of preparation of nano-silica modified styrene-butadiene latex, can solve the problems of poor product stability and high viscosity, and achieves lower viscosity, lower viscosity and structural gel content. , the application effect is good

Inactive Publication Date: 2017-05-24
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN200910229283.6 discloses a production method of styrene-butadiene latex modified emulsified asphalt, but this technology has disadvantages such as poor product stability and high viscosity

Method used

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  • Method for preparing nanosilicon dioxide modified styrene-butadiene latex
  • Method for preparing nanosilicon dioxide modified styrene-butadiene latex
  • Method for preparing nanosilicon dioxide modified styrene-butadiene latex

Examples

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Effect test

Embodiment 1

[0031] Add 10-20 parts of nano silicon dioxide into 300 parts of ethanol solution. After ultrasonic dispersion for 10-15 minutes, add 20-40 parts of silane coupling agent 3-(methacryloyloxy)propyltrimethoxysilane, and continue ultrasonic dispersion for about 1 hour. After suction filtration, washing and vacuum drying, the nano-silica with active double bonds for surface modification is obtained.

[0032] Fatty acid sodium (chemical formula is RCOONa (R=C 11～17 )) mixed with rosin soap at a mass ratio of 1:1 to 2 to obtain a complex emulsifier.

[0033] Provide a redox initiation system composed of oxidizing agent cumene hydroperoxide, tert-butyl hydroperoxide, reducing agent ferrous sulfate, EDTA iron sodium salt.

[0034] 200 parts of solvent soft water, 25 parts of styrene, 2 parts of nano-silica with active double bonds for surface modification, 0.5 parts of oxidizing agent, 0.8 part of reducing agent, 0.06 part of co-reductive agent carved white powder, 0.1 part of elect...

Embodiment 2

[0036] Please refer to Example 1 for the preparation methods of nano-silica with active double bonds on the surface, complex emulsifier and redox initiation system. 200 parts of soft water as a solvent, 35 parts of styrene, 4 parts of nano-silica with active double bonds for surface modification, 0.2 parts of oxidizing agent, 0.3 part of reducing agent, 0.08 part of co-reducing agent carved white powder, 0.1 part of electrolyte potassium phosphate and molecular weight regulator Add 0.1 parts of carbon tetrachloride and 2 parts of compound emulsifier into the polymerization reaction kettle, after vacuuming to -0.05MPa, feed 65 parts of butadiene, and react according to the three-stage heating method, the initial temperature is 20°C After 5 minutes, the temperature was raised to 28° C. and kept for 10 hours, and then after 5 minutes, the temperature was raised to 38° C. and kept warm. When the conversion rate of the monomer was measured to reach 50%, 0.9 parts of molecular weight...

Embodiment 3

[0038] Please refer to Example 1 for the preparation methods of nano-silica with active double bonds on the surface, complex emulsifier and redox initiation system. 200 parts of soft water as a solvent, 25 parts of styrene, 4 parts of nano-silica with active double bonds for surface modification, 0.3 parts of oxidizing agent, 0.8 part of reducing agent, 0.06 part of co-reducing agent carved white powder, 0.3 part of electrolyte potassium phosphate and molecular weight regulator Add 0.2 parts of dodecyl mercaptan and 2 parts of compound emulsifier into the polymerization reactor. After vacuuming to -0.05MPa, 75 parts of butadiene are introduced, and the reaction is carried out in a three-stage heating method. The initial temperature is 20°C, heat up to 28°C for 5 minutes and keep it warm for 10 hours, and then raise the temperature to 38°C for 5 minutes and keep it warm. When the measured monomer conversion rate reaches 50%, add 1.8 parts of molecular weight regulator dodecyl me...

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Abstract

The invention discloses a method for preparing nanosilicon dioxide modified styrene-butadiene latex. An emulsion polymerization mode of stepwise heating is adopted, styrene and butadiene monomers are added into a polyreactor at a time, meanwhile, nanosilicon dioxide with the surface modified with activated double bonds is added to serve as functional filler, a molecular weight modifier, an emulgator and an oxidizing agent are added in batches, and finally the styrene-butadiene latex with good mechanical stability, bonding strength and the like is obtained. The styrene-butadiene latex is good in heat resistance and wear resistance, and is mainly applied to road asphalt modification.

Description

technical field [0001] The invention relates to the preparation of organic polymer compounds, in particular to a preparation method of nano-silica modified styrene-butadiene latex. Background technique [0002] Emulsion polymerization is one of the four methods of producing high polymers. The system generally consists of monomers, media (usually water), initiators and emulsifiers. In the styrene-butadiene emulsion polymerization system, the monomer butadiene and styrene are difficult to dissolve in water, and the emulsifier usually uses an oil-in-water anionic surfactant such as alkyl sulfate, fatty acid salt, and rosin soap. Above the CMC (critical micelle concentration), the system can form a large number of micelles; the initiation system generally uses water-soluble persulfate such as potassium persulfate, etc. or redox system such as hydrogen peroxide / ferric sulfite. In addition, molecular weight regulators are often added, such as tertiary dodecyl mercaptan, which can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F236/10C08F212/08C08F2/38C08F2/26C08F4/40C08K9/06C08K3/36C08K5/18
CPCC08F236/10C08F2/26C08F2/38C08F4/40C08K3/36C08K5/18C08K9/06C08K2201/011C08F212/08
Inventor 戴李宗朱继红吴顺伟杨丽罗伟昂曾碧榕袁丛辉许一婷陈国荣
Owner XIAMEN UNIV
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