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Styrene-butadiene rubber (SBR) butadiene-styrene latex for modified emulsified asphalt and preparation method of SBR butadiene-styrene latex

A technology of styrene-butadiene latex and emulsified asphalt, used in building components, building insulation materials, construction and other directions, can solve the problems of affecting performance, low physical and mechanical properties, uneven dispersion, etc. , the effect of improving the bonding performance

Active Publication Date: 2019-07-16
山东海方橡胶科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although ordinary low-temperature latex-modified emulsified asphalt has higher softening point, viscous toughness, and toughness than high-temperature latex-modified emulsified asphalt, within a certain range of addition, the softening point of ordinary low-temperature styrene-butadiene latex-modified emulsified asphalt is still It is difficult to achieve the softening point ≥ 53°C required by the Ministry of Communications JTG F40-2004 "Technical Specifications for Construction of Highway Asphalt Pavement"
In order to prepare high-performance modified emulsified asphalt, most of them use SBS modified asphalt for emulsification, and then add styrene-butadiene latex for compound modification to produce modified emulsified asphalt. This method has a good modification effect, but the emulsified modified asphalt is harmful to equipment. , technology, and material requirements are relatively high, and the stability of the emulsified SBS modified asphalt prepared is relatively low
[0005] Chinese patent CN201610273186.7 discloses a method, which uses butadiene, styrene, glycidyl methacrylate, and silane coupling agent as raw materials to obtain latex by high-temperature (50°C~55°C) emulsion polymerization. Agglomeration, ion conversion, and centrifugal concentration are used to produce high-content styrene-butadiene latex, and then the latex is compounded with a 40% aqueous solution of silane coupling agent for emulsified asphalt modification; The mechanical properties are low, and the high-temperature performance margin of the modified emulsified asphalt is not large. The silane coupling agent is hydrolyzed too quickly under acidic conditions, and silane gel has been formed, resulting in uneven dispersion and affecting performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Vulcanization graft modification of general-purpose synthetic styrene-butadiene rubber emulsion

[0036] 1.1 Add 2791 grams of 1500-type styrene-butadiene rubber emulsion with a solid content of 21.5% into the reactor, start stirring, and the rotation speed is 150r / min;

[0037]1.2 Add 80 grams of disproportionated potassium abietate soap with a concentration of 25%, 2 grams of benzoyl peroxide, 20 grams of diphenylmethane diisocyanate (MDI), isopropyl dioleic acid acyloxy (diisooctyl phosphate Oxygen) titanate 15 grams, 1% sodium metabisulfite aqueous solution 30 grams;

[0038] 1.3 After the addition, stir for 45 minutes at 30°C and a stirring speed of 150r / min to fully disperse the material evenly. Raise the temperature to 70°C, and react at 70°C for 3.5 hours to obtain the cross-linked grafted styrene-butadiene rubber emulsion;

[0039] 1.4 Slowly add 15 grams of 5% polyvinyl methyl ether aqueous solution of latex agglomeration agent, and stir for 15 minutes to...

Embodiment 2

[0047] 1) Vulcanization graft modification of general-purpose synthetic styrene-butadiene rubber emulsion

[0048] 1.1 Add 2927 grams of 1502-type styrene-butadiene rubber emulsion with a solid content of 20.5% into the reaction kettle, start stirring, and the rotation speed is 240r / min;

[0049] 1.2 Add 60 grams of fatty acid potassium soap with 20% concentration, 4.8 grams of dicumyl hydroperoxide, 11 grams of toluene diisocyanate (TDI), 41 grams of isopropyl trioleate acyloxy titanate, 1% concentration of 20 grams of sodium bisulfite aqueous solution;

[0050] 1.3 After the addition, stir for 50 minutes at 27°C and a stirring speed of 240r / min to fully disperse the material evenly. Raise the temperature to 66°C and react at 70°C for 4 hours to obtain the cross-linked grafted styrene-butadiene rubber emulsion;

[0051] 1.4 Slowly add 26 grams of 4% hydroxyethyl cellulose aqueous solution of latex agglomeration agent, and stir for 12 minutes to fully agglomerate the latex; ...

Embodiment 3

[0059] 1) Vulcanization graft modification of general-purpose synthetic styrene-butadiene rubber emulsion

[0060] 1.1 Add 2715 grams of 1502-type styrene-butadiene rubber emulsion with a solid content of 22.1% into the reaction kettle, start stirring, and the rotation speed is 150r / min;

[0061] 1.2 Add 100 grams of disproportionated potassium abietate soap with a concentration of 25%, 1.5 grams of dicumyl peroxide, 14 grams of triallyl isocyanurate (TAIC), isopropyl dioleic acid acyloxy (di 18 grams of isooctyl phosphate acyloxy) titanate, 30 grams of 1% sodium metabisulfite aqueous solution;

[0062] 1.3 After the addition, stir for 40 minutes at 32°C and a stirring speed of 180r / min to fully disperse the material evenly. Raise the temperature to 73°C and react at 73°C for 3 hours to obtain the cross-linked grafted styrene-butadiene rubber emulsion;

[0063] 1.4 Slowly add 15 grams of latex agglomeration agent 4% polyvinyl alcohol (model 1788) aqueous solution, and stir f...

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PUM

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Abstract

The invention discloses styrene-butadiene rubber (SBR) butadiene-styrene latex for modified emulsified asphalt and a preparation method of the SBR butadiene-styrene latex, and belongs to the technicalfield of asphalt modification. The SBR butadiene-styrene latex is characterized by consisting of the following raw materials in parts by weight: 100 parts of a cross-linked grafted styrene-butadienerubber emulsion with a solid content of 40-60%, 2-6 parts of a nonionic emulsifier, 3-6 parts of a cationic emulsifier and 0.5-1.5 parts of a system pH regulator. The preparation steps are as the follows: concentrating the cross-linked grafted styrene-butadiene rubber emulsion until the latex concentration reaches 40-60%; adding the nonionic emulsifier, and carrying out stirring for 10-15 minutes;adding the cationic emulsifier according to the proportion of the raw materials, and carrying out stirring for 10-15 minutes; and adding the system pH regulator according to the proportion of the rawmaterials to adjust the pH value to be 2-5. The SBR butadiene styrene latex disclosed by the invention is convenient to use, has high stability after being mixed with emulsified asphalt, and can obviously improve high temperature resistance, viscosity toughness, toughness and anti-aging performance of the asphalt.

Description

technical field [0001] The invention discloses SBR styrene-butadiene latex for modifying emulsified asphalt and a preparation method thereof, belonging to the technical field of asphalt modification. Background technique [0002] Modified emulsified asphalt can be used in construction by spraying, pouring and mixing and paving. It is widely used in asphalt pavement adhesive layer oil and penetrating layer oil, slurry seal layer, micro-surfacing and structural pavement in highway engineering. Base and top coats. When the modified emulsified asphalt is used to pave the road, it can be constructed at room temperature without heating the asphalt and mineral materials, which not only simplifies the operation process, but also saves energy. At the same time, it plays an important role in the timely maintenance and repair of the damaged asphalt pavement. [0003] SBR styrene-butadiene latex modified emulsified asphalt is divided into anionic, cationic and non-ionic, among which th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L75/14C08L29/10C08L51/00C08L29/04C08L1/28C08K5/18C08K5/3437C08K5/13C08G18/69C08G18/64C08G18/76C08G18/83C08F257/02C08F289/00C08F226/06
CPCC08F257/02C08F289/00C08G18/64C08G18/69C08G18/7614C08G18/7671C08G18/838C08L95/005C08L2201/08C08L2205/035C08L75/14C08L29/10C08K5/18C08K5/3437C08L1/284C08F226/06C08L51/003C08L51/00C08L29/04C08K5/13
Inventor 李洪强王涛李美霞
Owner 山东海方橡胶科技有限公司
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