Process for preparing modified building asphalt

A technology of construction asphalt and production method, which is applied in the direction of construction, building components, building structure, etc., can solve the problems of high price, large amount of addition, and difficult acceptance by users.

Inactive Publication Date: 2003-06-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technologies all use a certain polymer to modify the basic asphalt. Although it can effectively improve the degree of gelation of the asphalt, the elastic deformation capacity of the asphalt will be enhanced, and the temperature sensitivity will be reduced. However, using a single modifier To modify asphalt, on the one hand, according to different polymers, it can only focus on improving the high temperature stability or low temperature crack resistance of asphalt, and at the same time improve the high temperature stability and low temperature crack resistance due to large temperature changes it is hard
On the other hand, even if a small number of polymers can significantly improve the high and low temperature performance of asphalt, due to the large amount of addition (generally not less than 14%) and the high price, the cost is too high, making it difficult for users to accept

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Two polymers, SBS and ethylene-propylene copolymer, are added to the base asphalt.

[0018] The properties of the base asphalt are listed in Table 1. SBS model is YH-792, linear structure, block ratio S / B is 40 / 60, average molecular weight 10×10 4 ; B-propylene copolymer is B type, ethylene content 10%, melt index 20, Rockwell hardness 90, heat distortion temperature 115 ℃.

[0019] First, heat the base asphalt to 150°C to 160°C, use a high-shear mixer emulsifier, and while stirring, add SBS and ethylene-propylene copolymer to the asphalt in sequence for 3 minutes to 5 minutes. The mixing temperature was then kept at 170°C to 190°C, and the entire sample was continuously mixed for 2 hours. The addition amount of SBS is 5.0%, and the addition amount of ethylene-propylene copolymer is 7.0%. The properties of the tested samples are listed in Table 2.

[0020]

project

Penetration

25°C

1 / 10mm

Softening Point

℃

Extensibili...

Embodiment 2

[0025] Two polymers, SBS and PE, are added to the asphalt.

[0026] The properties of base asphalt are the same as Example 1, and the polymer is two kinds of polymers, SBS and PE, and the model of SBS is the same as Example 1, and PE is linear low density polyethylene (the model is LL0209). The addition amount of SBS is 8.0w%, the addition amount of PE is 4.0w%, and the polymer is added together within 3min~5min. The properties of the tested samples are listed in Table 3.

[0027]

[0028] The data in Table 3 shows that the construction asphalt produced by compound modification of base asphalt with SBS and PE has improved high and low temperature performance and temperature sensitivity, which meets the standard of Japanese waterproof asphalt JISK2207-1980.

Embodiment 3

[0030] Three kinds of polymers including SBS, APP and ethylene-propylene copolymer were added to the asphalt.

[0031] The properties of base asphalt are the same as Example 1, and the addition method is the same as Example 1. Polymer is SBS, APP (random polypropylene) and ethylene-propylene copolymer, and the model of SBS and ethylene-propylene copolymer is the same as example 1. The addition amount of SBS is 4.0w%, the addition amount of APP is 6.0w%, the addition amount of ethylene-propylene copolymer is 4.0w%. The properties of the tested samples are listed in Table 4.

[0032]

[0033] The results in Table 4 show that the compound modification of base asphalt by SBS, APP and ethylene-propylene copolymer can also produce modified building asphalt with good high and low temperature performance and temperature sensitivity, which conforms to Japanese waterproof asphalt JISK-1980 standard.

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Abstract

A modified asphalt for building is prepared from basic asphalt with penetration of 60-150 1/10 mm and soft point of 30-70 deg.C and two or more polymers as modifier (10-25 wt%). The resultant asphalt features its improved high-and low-temp performance and themp sensing nature.

Description

technical field [0001] The invention relates to a production method of construction asphalt, in particular to a method for producing construction asphalt by compounding and modifying basic asphalt with a polymer. Background technique [0002] Bitumen is a black to dark brown solid or semi-solid viscous substance that occurs in nature or is produced by petroleum refining processes. Because of its good adhesion and impermeability as well as weather resistance, bitumen has been widely used for pavement binder and roof waterproofing. [0003] In recent years, although the quality and construction technology of building asphalt for waterproofing and moisture-proofing have been greatly improved, there are still problems such as low-temperature cracking, high-temperature flow, low strength, and poor elasticity, which restrict the life of waterproofing projects. Therefore, , There have been various methods to improve the quality of building asphalt. [0004] One method is the cata...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00
Inventor 郭皎河冯敏哿曲涛李永泰付丽杨泽雨
Owner CHINA PETROLEUM & CHEM CORP
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