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Method for preparing styrene-butadiene latex without adding emulsifier

The technology of styrene-butadiene latex and emulsifier is applied in the field of preparing styrene-butadiene latex without adding emulsifier, and can solve the problems such as difficulty in controlling the type and amount of emulsifier added, complicated preparation process of styrene-butadiene latex, influence on the quality of styrene-butadiene latex, etc. Achieve the effect of avoiding high conversion rate, improving strength and elasticity, and not easy to dissipate heat

Inactive Publication Date: 2016-05-04
山东新兴业环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All in all, depending on the type of styrene-butadiene latex required, the type and amount of emulsifier required are different. Therefore, the type and amount of emulsifier added are not easy to grasp, and it is easy to affect the final quality of styrene-butadiene latex. The emulsifier is An uncontrollable factor in the preparation process of styrene-butadiene latex makes the preparation process of styrene-butadiene latex complicated and the preparation difficulty increases
Moreover, the emulsifier is easy to remain in the finished product of styrene-butadiene latex, and it is difficult to remove. When the solid polymer is to be obtained, the post-treatment is more complicated, and it needs to go through processes such as coagulation, washing, dehydration, and drying, and the production cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing styrene-butadiene latex without adding emulsifier comprises the following steps:

[0022] 1) Add 40% of the total weight of the mixed monomers into the reaction kettle, raise the temperature to 78°C, and adjust the pH to 3 with acrylic acid accounting for 1.7% of the total weight of the mixed monomers, and add 0.2% of the total weight of the mixed monomers dropwise while stirring. % of disodium ethylenediaminetetraacetic acid, accounting for 0.1% of the total weight of the mixed monomer, and ammonium persulfate with a mass concentration of 5%. The weight percent of each component of the mixed monomer is: 35% of styrene, 60% of butadiene; 5% of methylol acrylamide;

[0023] 2) Add the remaining mixed monomers to the mixed liquid obtained in step 1), and raise the temperature to 81°C, and add dropwise ammonium persulfate, which accounts for 0.6% of the total weight of the mixed monomers and has a mass concentration of 7.2%, while stirring. The tota...

Embodiment 2

[0027] A method for preparing styrene-butadiene latex without adding emulsifier comprises the following steps:

[0028] 1) Add 40% of the total weight of the mixed monomers into the reactor, raise the temperature to 80°C, and adjust the pH to 3 with acrylic acid accounting for 2% of the total weight of the mixed monomers, and add 0.8% of the total weight of the mixed monomers dropwise while stirring. % of disodium ethylenediaminetetraacetic acid, accounting for 0.5% of the total weight of the mixed monomer, and ammonium persulfate with a mass concentration of 7%. The weight percent of each component of the mixed monomer is: 60% of styrene, 35% of butadiene; 5% of methylol acrylamide;

[0029] 2) Add the remaining mixed monomers to the mixed liquid obtained in step 1), and raise the temperature to 83°C, and add dropwise ammonium persulfate, which accounts for 0.9% of the total weight of the mixed monomers and has a mass concentration of 7.5%, while stirring. The total weight o...

Embodiment 3

[0033] A method for preparing styrene-butadiene latex without adding emulsifier comprises the following steps:

[0034] 1) Add 40% of the total weight of the mixed monomers into the reaction kettle, raise the temperature to 79°C, and adjust the pH to 3 with acrylic acid accounting for 1.75% of the total weight of the mixed monomers, and add 0.5% of the total weight of the mixed monomers dropwise while stirring. % of disodium ethylenediaminetetraacetic acid, accounting for 0.3% of the total weight of the mixed monomer, and ammonium persulfate with a mass concentration of 6%. The weight percent of each component of the mixed monomer is: 49% of styrene, 50% of butadiene; 1% of methylol acrylamide;

[0035] 2) Add the remaining mixed monomers to the mixed liquid obtained in step 1), and raise the temperature to 82°C, and add dropwise ammonium persulfate, which accounts for 0.75% of the total weight of the mixed monomers and has a mass concentration of 7.3%, while stirring. The to...

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Abstract

The invention relates to a method for preparing styrene-butadiene latex without adding emulsifier. The method comprises the following steps: 1, adding mixed monomer with the weight accounting for 40% of the total weight into a reaction kettle, raising the temperature to 78-80 DEG C, adjusting PH to 3 with organic acid at the same time, dropwise adding an additive and first-phase initiator in the stirring process, and after dropwise adding is completed, conducting a reaction for 40-50 minutes while the temperature is preserved till the conversion rate of the mixed monomer is 60%; 2, adding the remaining mixed monomer to mixed liquor obtained in step 1, raising the temperature to 81-83 DEG C, adding second-phase initiator and a cocatalyst dropwise in the stirring process, and conducting a reaction for 4-5 hours while the temperature is preserved till the monomer is converted completely; 3, adjusting PH to 7-8 with an alkaline compound, and lowering the temperature to the room temperature, so that the finished product styrene-butadiene latex is obtained. Compared with the prior art, the method has the advantages that the emulsifier is not needed to be added, process operation is simple, and cost is low.

Description

technical field [0001] The invention relates to the technical field of styrene-butadiene latex production, in particular to a method for preparing styrene-butadiene latex without adding an emulsifier. Background technique [0002] SBR latex is an aqueous solution with a solid content of 30%-50% obtained by emulsion polymerization of butadiene and styrene. It is formed by emulsion polymerization of different proportions of styrene and butadiene. According to the difference of styrene content, emulsifier and polymerization temperature, etc., there are many varieties, and their properties and uses are also different. [0003] Emulsifier is one of the main components in the existing emulsion polymerization system. Although it does not participate in chemical reactions, it plays a very important role in the emulsion polymerization process. Generally speaking, emulsifiers can reduce surface tension and interfacial tension, emulsify , dispersing, solubilizing, foaming and other fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F236/10C08F212/08C08F220/58C08F2/22
CPCC08F212/08C08F2/22C08F236/10C08F2400/02C08F220/58
Inventor 陈玉文张敬政王希川章莹司呈清
Owner 山东新兴业环保科技股份有限公司
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