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A kind of styrene-butadiene latex for emulsified asphalt modification with high solid and low viscosity and preparation method thereof

A technology for emulsified asphalt and styrene-butadiene latex, which is used in building components, building insulation materials, buildings, etc., can solve the problems of complex preparation process, long reaction time of synthetic latex, research on solid content and viscosity of latex, etc.

Active Publication Date: 2019-03-15
CHAMBROAD CHEM IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthetic latex disclosed in this patent takes a long time to react, the preparation process is complicated, and the solid content and viscosity of the latex have not been studied in detail

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Preparation of seed milk:

[0028] Using a 2L polymerization kettle, the feeding capacity is 1200g in total, first vacuumize, then replace with nitrogen, add 10 parts of all emulsifier solutions (wherein 6.64 parts of disproportionated abietic acid soap, 3.36 parts of stearic acid soap, mass concentration 25%), 0.1 part of potassium chloride, 0.3 part of ferrous sulfate, 0.3 part of tertiary dodecylmercaptan and 443.72 parts of deionized water. After starting the stirring, add 70 parts of butadiene and 30 parts of styrene. When it reached 5°C, all the hydrogen peroxide was added to start the reaction with 0.3 parts of menthane. When the conversion reached 100%, the reaction was stopped.

[0029] 2) Preparation of high solid content styrene-butadiene latex

[0030] Using a 2L polymerization kettle, the feeding amount is 1200g in total, first vacuumize, then replace with nitrogen, add 5 parts of above-mentioned seed milk, 4.84 parts of emulsifier solution (wherein 6....

Embodiment 2

[0033] 1) Preparation of seed milk:

[0034] Using a 2L polymerization kettle, the amount of feed is 1200g in total, first vacuumize, then replace with nitrogen, add 13.8 parts of all emulsifier solutions (wherein 9.16 parts of disproportionated abietic acid soap, 4.67 parts of oleic acid soap, mass concentration 25 %), 0.1 part of sodium bicarbonate, 0.02 part of ferrous nitrate, 0.3 part of tertiary dodecylmercaptan and 551 parts of deionized water. After starting the stirring, add 75 parts of butadiene and 25 parts of styrene. When the temperature of the reactor reaches At 8°C, add all the hydrogen peroxide to initiate a reaction with 0.1 part of pinane. When the conversion reached 100%, the reaction was stopped.

[0035] 2) Preparation of high solid content styrene-butadiene latex

[0036] Use 2L polymerizer, feed intake is 1200g altogether, at first vacuumize, then replace with nitrogen, add above-mentioned seed milk 10 parts, emulsifier solution 4 parts (wherein dispro...

Embodiment 3

[0039] 1) Preparation of seed milk:

[0040]Using a 2L polymerization kettle, the feeding amount is 1200g in total, first vacuumize, then replace with nitrogen, and add 15 parts of all emulsifier solutions (wherein 10.28 parts of disproportionated abietic acid soap, 4.72 parts of oleic acid soap, mass concentration 25 %), 0.1 part of sodium hydrogen phosphate, 0.05 part of ferrous phosphate, 0.1 part of dithiol and 258.8 parts of deionized water. After starting stirring, add 60 parts of butadiene and 40 parts of styrene. 0.3 parts of pinane were added to initiate the reaction by adding all the hydrogen peroxide. When the conversion reached 100%, the reaction was stopped.

[0041] 2) Preparation of high solid content styrene-butadiene latex

[0042] Use 2L polymerizer, feed intake is 1200g altogether, at first vacuumize, then replace with nitrogen, add 15 parts of above-mentioned seed milks, 3 parts of emulsifier solutions (wherein 2 parts of disproportionated abietic acid so...

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PUM

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Abstract

The invention relates to a preparing method of high-solid low-viscosity styrene-butadiene latex. The method includes the steps that a seeded emulsion polymerization process is adopted, butadiene and styrene serve as main monomers, seeded emulsion with the grain size ranging from 50 nm to 100 nm is firstly prepared, a redox initiator, a dispersing agent, a molecular weight modifier and the like are added, and the rest of the main monomers, auxiliary monomer and compound emulsifier are dipped into a reaction still; and meanwhile, low-temperature (5-15 DEG C) and high-temperature (50-70 DEG C) two-section method polymerization is adopted, electrolyte is added in batches to be subject to reacting, the reacting is stopped when the conversion percent is larger than 90% and the reaction time is about 12 h to 16 h, and the styrene-butadiene latex with the solid content being above 55% and the viscosity smaller than 1000 cp is obtained. According to the preparing method, one-step method synthesis is adopted, the process is simple, control is easy, the product stability is good, and transportation is convenient. The styrene-butadiene latex obtained through the method is mainly used for modifying emulsified asphalt, the performance is excellent and controllable, and the compatibility is good.

Description

technical field [0001] The invention relates to a preparation method of high-solid content and low-viscosity styrene-butadiene latex, which is mainly used in the preparation of modified emulsified asphalt, and can also be used in the preparation of styrene-butadiene latex in other fields. Background technique [0002] Modified emulsified asphalt is widely used in highway construction and maintenance projects, and styrene-butadiene latex SBRL is currently a commonly used emulsified asphalt modifier. The preparation of modified emulsified asphalt includes external blending method and internal blending method. The external blending method is to add a certain amount of styrene-butadiene latex to the emulsified asphalt before application, and stir evenly. This method has lower requirements on equipment and technology, and the production process is simpler. Most of the styrene-butadiene latex is imported from abroad, and the price is expensive. Domestic research on high-solid-con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F236/10C08F212/08C08F2/38C08F2/26C08L95/00C08L9/08
CPCC08F236/10C08L95/00C08F212/08C08F2/38C08F2/26C08L9/08
Inventor 王文文马韵升栾波姚刚柳金章刘振学郭平云王欣
Owner CHAMBROAD CHEM IND RES INST CO LTD
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