SBR Latex Composite Modified Asphalt and Its Preparation Method

A technology of composite modified asphalt and styrene-butadiene latex, which is applied in the direction of building components, building insulation materials, buildings, etc., can solve the problems of small improvement in high temperature resistance, pollution of the environment, and little increase in the softening point of asphalt, and achieve the goal of improving cohesion Effect

Active Publication Date: 2015-12-16
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of these polymer materials greatly improves the temperature sensitivity of asphalt materials and broadens the application temperature range of asphalt materials. However, resin asphalt modifiers such as PE can only improve the high temperature resistance of asphalt and require high shear. Grinding equipment can make it uniformly dispersed. Modified asphalt has poor stability, is easy to delaminate, and has high manufacturing costs. Although SBS thermoplastic elastomers can improve the high and low temperature performance of asphalt at the same time, high-shear grinding equipment is required, and the manufacturing cost is high. Inconvenient; rubber-based asphalt modifiers such as SBR have good low-temperature cracking resistance, and the time delay at 5°C is several times higher than that of ordinary asphalt, but the softening point of asphalt is not greatly improved, and the effect of improving high temperature resistance is small; such as the United States Patent US5002987 reports the performance of SBR modified asphalt, but SBR mainly improves the low temperature performance of asphalt, and the improvement of high temperature performance is not ideal, and the long-term storage stability is poor
Chinese patent CN1287133 discloses the method of using SBR and SBS composite modified asphalt, but because SBS is used as the modifier, colloid mill equipment is required, and the production process is relatively complicated. At the same time, the addition of sulfur will produce toxic hydrogen sulfide in the production process Gas, pollute the environment, and from the results of the segregation test, it can be seen that, except that the addition of SBR is 1.50%, the addition of SBS is 2.00% and the addition of SBR is 3.00%, and the separation degree is 0°C when the addition of SBS is 0.50%. , there is a certain degree of separation in the composite modified asphalt in the remaining examples, indicating that the storage stability of the composite modified asphalt prepared by this method is not good

Method used

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  • SBR Latex Composite Modified Asphalt and Its Preparation Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The 400g heavy traffic volume 90 # Heat the road asphalt to 170°C, then add 40g of SBR (equivalent to 181.82g of SBR emulsion, grade 1500, containing 22% SBR solid glue) slowly, start the stirring equipment to stir slowly, and continue heating to remove the water in the SBR emulsion After the water is removed, the temperature of the asphalt is slowly raised to 195°C, and then 4g of MAC asphalt modifier is added. Among them, the particle size of the selected MAC asphalt modifier is below 0.6mm, and the water content is between 0.4% and 1.2%. Between, the bulk density is 0.57-0.67g / cm 3 Between (the same below). Stir at a stirring speed of 550r / min for 0.6h until the modifier dissolves evenly, then measure the properties of the modified asphalt. See Table 1.

Embodiment 2

[0020] The 400g weight volume is 70 # Heat the road asphalt to 170°C, then add 24g of SBR (equivalent to 109.09g of SBR emulsion, grade 1500, containing 22% SBR solid glue) slowly, start the stirring equipment to stir slowly, and continue heating to remove the water in the SBR emulsion After the water was removed, the temperature of the asphalt was slowly raised to 195°C, then 8g of MAC asphalt modifier was added, and stirred at a stirring speed of 550r / min for 0.6h until the modifier was dissolved evenly, and the performance of the modified asphalt was measured. See Table 1.

Embodiment 3

[0022] The 400g weight volume is 70 # Heat the road asphalt to 170°C, then add 20g of SBR (equivalent to 90.91g of SBR emulsion, grade 1500, containing 22% SBR solid glue) slowly, start the stirring equipment to stir slowly, and continue heating to remove the water in the SBR emulsion After the water was removed, the temperature of the asphalt was slowly raised to 195°C, then 12g of MAC asphalt modifier was added, and stirred at a stirring speed of 550r / min for 0.6h until the modifier was dissolved evenly, and the performance of the modified asphalt was measured. See Table 1.

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Abstract

The invention relates to the field of asphalt modification, and particularly relates to styrene-butadiene latex composite modified asphalt and a preparation method thereof. The preparation method comprises the following steps of: heating road asphalt till the road asphalt completely flows; then adding styrene-butadiene latex and an MAC (Media Access Control) asphalt modifying agent to the road asphalt, starting stirring till the MAC asphalt modifying agent is uniformly melted. The styrene-butadiene latex composite modified asphalt prepared through the method has excellent high-low temperature resistant comprehensive property, and can not only be applied to a high-temperature area, but also be applied to a cold area. Besides, the preparation method of the composite modified asphalt can complete the mixed reaction process by only adopting common stirring equipment without adopting high-shear grinding equipment, thus the preparation method has the advantages of simple process, small investment, low energy consumption and site blending, and is convenient to operate and apply.

Description

technical field [0001] The invention relates to the field of asphalt modification, and specifically relates to a styrene-butadiene latex composite modified asphalt and a preparation method thereof. Background technique [0002] Asphalt has been widely used as the main bonding material in road engineering. However, due to the inherent disadvantages of asphalt materials, which are hot, cold, brittle, and strong temperature sensitivity, asphalt pavement is prone to wrapping and oil flooding at high temperatures in summer, and cracks and other problems are prone to occur at low temperatures in winter, which affects the driving comfort and use of the pavement. life. Especially with the development of the economy, the traffic volume, driving speed and traffic load are increasing day by day, which puts forward higher requirements for the performance and life of high-grade highways. The contradiction that asphalt materials cannot meet the requirements of use has become increasingl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L9/06C08K5/00C04B26/26
Inventor 贾丽凤高淑美马鹏程许金山刘爱华
Owner CHINA PETROLEUM & CHEM CORP
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