A kind of modified coal tar pitch with stable performance at low temperature and preparation method thereof

A coal tar pitch and modification technology, applied in building thermal insulation materials, building components, buildings, etc., can solve the problems of narrow application range, poor ductility, low temperature brittle cracking, etc., to reduce unstable performance, excellent low temperature performance, improve The effect of stability

Active Publication Date: 2018-01-02
SHANXI PROVINCIAL RES INST OF COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with petroleum asphalt, coal asphalt has the advantages of high softening point, good bonding performance, low cost, strong anti-rutting ability, strong aging resistance and good wear resistance. Widely used in areas such as
However, as a by-product of the coal coke industry, the application range of coal tar pitch is narrow, and a large amount of coal tar pitch is unsalable, resulting in a great waste of resources
[0004] At present, most of the modified coal asphalt has low temperature brittleness and poor ductility, and it is difficult to achieve the performance of petroleum-based asphalt. Compared with modified petroleum asphalt, the difference is greater, which greatly restricts the wide application of coal asphalt
At present, the method for improving the low-temperature performance of coal tar pitch is mainly to directly add some modifiers to coal tar pitch to improve its low-temperature ductility. However, the low-temperature performance of modified coal tar pitch rarely reaches " The technical requirements of modified petroleum asphalt in "Technical Specifications for Construction of Highway Asphalt Pavement" (JTG F40-2004), even difficult to meet the technical requirements of petroleum asphalt in high-grade highways

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Heat medium-temperature coal tar pitch and 70# Shell petroleum pitch in an oven at 120°C for 4 hours, then weigh 50 parts of medium-temperature coal tar pitch and 50 parts of 70# Shell petroleum pitch and mix them into a stirring tank, heat and mechanically stir to 150°C , stirred at a constant temperature for 30 minutes; weighed 5 parts of octyl phthalate and 5 parts of polyethylene glycol 400, slowly added to the above stirring tank, and continued to stir at a constant temperature for 10 minutes; And heat the stirring tank to 180°C, add 3 parts of polyalphaolefin PAO2.5, 5 parts of powdered styrene-butadiene rubber SBR, and use 5000rpm high-speed shear to keep the temperature of the asphalt mixture in the stirring tank between 180-190°C, constant temperature and constant High-speed shearing for 60 minutes, and then naturally cooled to room temperature, the modified coal tar pitch was prepared. The prepared modified coal tar pitch has a softening point of 47.0°C, a pen...

Embodiment 2

[0017] Heat medium-temperature coal tar pitch and 70# Shell petroleum pitch in an oven at 120°C for 4 hours, then weigh 70 parts of medium-temperature coal tar pitch and 30 parts of 70# Shell petroleum pitch and mix them into a stirring tank, heat and mechanically stir to 150°C , stirred at a constant temperature for 30 minutes; weighed 5 parts of octyl phthalate and 5 parts of polyethylene glycol 600, slowly added to the above stirring tank, and continued to stir at a constant temperature for 10 minutes; And heat the stirring tank to 180°C, add 5 parts of powdered styrene-butadiene rubber SBR, use 5000rpm high-speed shearing to keep the temperature of the asphalt mixture in the stirring tank between 180-190°C, keep the constant temperature and speed high-speed shearing for 60 minutes, and then cool naturally to room temperature, the modified coal tar pitch is prepared. The prepared modified coal tar pitch has a softening point of 58.0°C, a penetration of 94, and a ductility o...

Embodiment 3

[0019] Heat medium-temperature coal tar pitch and 70# Shell petroleum pitch in an oven at 120°C for 4 hours, then weigh 60 parts of medium-temperature coal tar pitch and 40 parts of 70# Shell petroleum pitch and mix them into a stirring tank, heat and mechanically stir to 150°C , stirred at a constant temperature for 30 minutes; weighed 5 parts of butyl phthalate and 5 parts of polyethylene glycol 800, slowly added to the above stirring tank, and continued to stir at a constant temperature for 10 minutes; And heat the stirring tank to 180°C, add 5 parts of powdered styrene-butadiene rubber SBR, use 5000rpm high-speed shearing to keep the temperature of the asphalt mixture in the stirring tank between 180-190°C, keep the constant temperature and speed high-speed shearing for 60 minutes, and then cool naturally to room temperature, the modified coal tar pitch is prepared. The prepared modified coal tar pitch has a softening point of 56.5°C, a penetration of 112, and a ductility ...

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Abstract

The invention relates to modified coal asphalt being stable in performance at a low temperature and a preparation method thereof. The modified coal asphalt includes the following raw materials, by mass: 30-90 parts of coal asphalt, 10-70 parts of petroleum asphalt, 1-5 parts of phthalate, 1-10 parts of polyethylene glycol, 0-3 parts of poly-[alpha]-olefin and 1-10 parts of butadiene styrene rubber powder. Compared with the prior art, the modified coal asphalt has following advantages: the added poly-[alpha]-olefin can improve the stability, uniformity and low-temperature performance of the modified coal asphalt, and reduces instable performance of the modified coal asphalt due to changes in temperature and SBR ingredients. Ductility property at 5 DEG C of the modified coal asphalt is greatly better than the relative performance of modified coal asphalt in the prior art. The performance of the modified coal asphalt achieves technical requirement of SBS modified petroleum asphalt. Compared with asphalt with petroleum as a substrate, the modified coal asphalt is lower in cost and better in low temperature performance. Devices required in the preparation process is simple and are universal with the devices of modified petroleum asphalt in the prior art, thereby reducing production cost.

Description

technical field [0001] The invention belongs to the technical field of coal tar pitch modification, and in particular relates to a modified coal pitch with stable performance at low temperature and a preparation method thereof. Background technique [0002] In recent years, as the price of petroleum asphalt has risen day by day, and the cost of road construction has increased day by day, people began to pay attention to other road petroleum asphalt substitute materials with low cost and good performance. Among them, coal tar pitch has attracted people's attention as an early road construction material. However, coal tar pitch is brittle at low temperature, has poor ductility and serious environmental pollution during construction, so it has not been effectively applied. At present, the domestic research on the road performance of coal tar pitch mainly focuses on two aspects: one is to improve the road performance index of coal tar pitch, especially the ductility and toughnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L71/02C08L23/00C08L9/06C08K5/12
CPCC08L95/00C08L2205/025C08L2205/035C08L71/02C08L23/00C08L9/06C08K5/12
Inventor 穆建青蔡丽娜谢邦柱宋杰华刘哲庞瑾瑜张帅刘鹏飞何信朱小林胡国鹏王永岗
Owner SHANXI PROVINCIAL RES INST OF COMM
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