A kind of preparation method of polybutadiene latex

A technology of polybutadiene latex and liquid polybutadiene, which is applied in the field of ABS resin materials, can solve the problems of affecting the VOC content of products, poor resin toughening effect, and excessive crosslinking degree

Active Publication Date: 2022-03-08
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, in order to improve the conversion rate of butadiene, the prior art prolongs the reaction time of small particle size latex, or adopts harsher reaction conditions (such as adding additional initiator CN106866885A, improving reaction temperature CN101125906A), and the produced latex has Excessively high cross-linking degree, its toughening effect on resin is poor
At the same time, the amount of butadiene dimer with a strong pungent odor will increase at high temperature, which will affect the VOC content of the product

Method used

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  • A kind of preparation method of polybutadiene latex
  • A kind of preparation method of polybutadiene latex
  • A kind of preparation method of polybutadiene latex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Potassium oleate 0.9g, disproportionated abietate potassium 1.1g, butadiene 100g, potassium carbonate 0.6g and tertiary dodecyl mercaptan (TDM) 0.7g, deionized water 250g are added in the reactor, Heating to 65°C, adding 0.25 g of potassium persulfate to initiate emulsion polymerization reaction, after 7 hours of reaction, the conversion rate of butadiene in the kettle was 73.5%, and the reaction was stopped, and unreacted butadiene was removed by vacuum flashing to obtain latex particles A small particle size polybutadiene latex emulsion with a diameter of 87nm.

[0054] (2) Heat the reactor to 70°C, add 10g of 110 liquid polybutadiene (purchased from Evonik, number average molecular weight 2600, 1,2-vinyl content 1%, 1,4-cis content 75%), 0.1g sodium linoleate, 0.1g stearic acid Sodium, continue to react for 2h, stop the reaction to obtain a polybutadiene latex emulsion with a particle size of 101.2nm.

[0055] The gel content of the polybutadiene latex was 27%...

Embodiment 2

[0057] (1) Add 0.7 g of sodium stearate, 0.9 g of sodium dodecylbenzenesulfonate, 100 g of butadiene, 0.4 g of sodium sulfite, 0.5 g of n-octadecyl mercaptan, and 100 g of deionized water into the reactor, Heating to 60°C, adding 0.35 g of cumene hydroperoxide to initiate emulsion polymerization reaction, after 6 hours of reaction, the conversion rate of butadiene in the kettle was 66.3%, and the reaction was stopped, and the unreacted butadiene was removed by vacuum flashing. A small particle size polybutadiene latex emulsion with a particle size of 82.4 nm was obtained.

[0058] (2) Cool the reactor to 55°C, add 20g of 130 liquid polybutadiene (purchased from Evonik, number average molecular weight 4600, 1,2-vinyl content 1%, 1,4-cis content 77%) and 0.1g sodium dodecylbenzenesulfonate, continued After reacting for 1.5 h, stop the reaction to obtain a polybutadiene latex emulsion with a particle size of 95.3 nm.

[0059] The gel content of the polybutadiene latex was 31.2...

Embodiment 3

[0061] (1) Add 0.9g of potassium stearate, 0.9g of potassium oleate, 100g of butadiene, 0.5g of potassium phosphate, 0.6g of n-octyl mercaptan, and 300g of deionized water into the reaction kettle, heat to 70°C, and add 0.27g of tert-butyl hydroperoxide initiates the emulsion polymerization reaction, and the butadiene conversion rate in the kettle is 71.7% after reacting for 6.5h, the reaction is stopped, and the unreacted butadiene is removed by vacuum flashing to obtain a particle size of 85.5 nm small particle size polybutadiene latex emulsion.

[0062] (2) Cool the reactor to 60°C, add 15g of liquid polybutadiene to the reactor (300g of 10%wt butadiene cyclohexane solution is added to the three-necked flask, keep the temperature in a water bath at 50°C for 30min, add the initiator n-Butyllithium, tetrahydrofuran, a structural regulator, until the concentrations of n-butyllithium and tetrahydrofuran in the system are 25mmol / L and 0.25mmol / L respectively, the polymerization ...

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Abstract

The invention discloses a preparation method of polybutadiene latex. The present invention removes the unreacted butadiene under the butadiene conversion rate of 60-80%, and makes the polybutadiene latex of small particle diameter; Turn to the liquid polybutadiene of certain molecular weight in the system, increase Large latex particle size to target value. The latex prepared by the method has lower cross-linking degree, and the ABS resin prepared therefrom has lower VOC content, yellowness index and impact resistance.

Description

technical field [0001] The invention discloses a preparation method of polybutadiene latex, which belongs to the field of ABS resin materials. Background technique [0002] The most widespread industrial production method of ABS resin is the emulsion grafting-bulk SAN blending method. This process uses emulsion polymerization to produce ABS grafted powder with a core-shell structure (the core layer is polybutadiene rubber, and the shell layer is grafted SAN). , and blend the grafted powder with SAN polymer to obtain the final ABS resin chips. The essence of the whole production process is to use polybutadiene rubber to toughen the SAN resin matrix, and its mechanism includes two ways of silver crack toughening and shear band toughening. How to control the particle size, graft composition, and graft ratio of the rubber phase is the focus of ABS resin performance research. [0003] As we all know, polybutadiene rubber has the best toughening effect when the particle diameter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F299/00C08F136/06C08F279/04
CPCC08F299/00C08F136/06C08F279/04
Inventor 孙一峰李俊平黎源秦凯韩强孙双翼
Owner WANHUA CHEM GRP CO LTD
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