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High-solid low-viscosity emulsified asphalt modification styrene-butadiene latex and preparing method thereof

An emulsified asphalt, high-solid and low-viscosity technology, used in building components, building insulation materials, construction, etc., can solve the problems of long reaction time, complex preparation process, latex solid content and viscosity research of synthetic latex.

Active Publication Date: 2017-04-05
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] Use a 2L polymerizer with a total feed volume of 1200g. First, vacuum and replace with nitrogen. Add 10 parts of all emulsifier solution to the polymerizer at once (including 6.64 parts of disproportionated rosin acid soap, 3.36 parts of stearic acid soap, and mass concentration 25%), 0.1 part of potassium chloride, 0.3 part of ferrous sulfate, 0.3 part of t-dodecane mercaptan and 443.72 parts of deionized water. After starting the stirring, add 70 parts of butadiene and 30 parts of styrene. When reaching 5°C, add all the hydrogen peroxide to start the reaction with 0.3 parts of menthane. When the conversion rate reached 100%, the reaction was stopped.

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

[0030] Use a 2L polymerizer with a total feed volume of 1200g. First, vacuum and replace with nitrogen. Add 5 parts of the above seed milk and 4.84 parts of emulsifier solution to the polymerizer (including 6.64 parts ...

Embodiment 2

[0033] 1) Preparation of seed milk:

[0034] Use a 2L polymerizer with a total feed amount of 1200g. First, vacuumize and replace with nitrogen. Add 13.8 parts of all emulsifier solution to the polymerizer at one time (including 9.16 parts of disproportionated rosin acid soap, 4.67 parts of oleic acid soap, and 25% mass concentration. %), 0.1 part of sodium bicarbonate, 0.02 part of ferrous nitrate, 0.3 part of t-dodecanethiol 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, 0.1 part of pinane was added to initiate a reaction with all hydrogen peroxide. When the conversion rate reached 100%, the reaction was stopped.

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

[0036] Use a 2L polymerizer with a total feed volume of 1200g. First, vacuumize and replace with nitrogen. Add 10 parts of the above-mentioned seed milk and 4 parts of emulsifier sol...

Embodiment 3

[0039] 1) Preparation of seed milk:

[0040] Use a 2L polymerizer with a total feed amount of 1200g. First vacuumize and replace with nitrogen. Add 15 parts of all emulsifier solution to the polymerizer at one time (including 10.28 parts of disproportionated rosin acid soap, 4.72 parts of oleic acid soap, and 25 parts by mass. %), 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 the stirring, add 60 parts of butadiene and 40 parts of styrene, when the temperature of the reactor reaches 10℃ At this time, add all the hydrogen peroxide to initiate a reaction with 0.3 parts of pinane. When the conversion rate reached 100%, the reaction was stopped.

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

[0042] Use a 2L polymerizer with a total feed amount of 1200g. First, vacuumize and replace with nitrogen. Add 15 parts of the above-mentioned seed milk and 3 parts of emulsifier...

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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 method for preparing high-solid content and low-viscosity styrene-butadiene latex, which is mainly applied to modified emulsified asphalt and can also be used for the preparation of styrene-butadiene latex in other fields. Background technique [0002] Modified emulsified asphalt is widely used in highway construction and maintenance projects. SBR latex SBRL is the most commonly used emulsified asphalt modifier. Modified emulsified asphalt is prepared by 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 mix it evenly. This method requires relatively low equipment and technology, and the production process is relatively simple. Most of the styrene butadiene latex used is imported from abroad, which is expensive. Domestic research on high solid content styrene-butadiene latex is mostly applied to...

Claims

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Application Information

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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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