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Chemical modification method of coal pitch with unsaturated thermoplastic elastomer

A thermoplastic elastomer, chemical modification technology, applied in asphalt coatings, tar asphalt/petroleum asphalt/natural asphalt, anti-corrosion coatings, etc., to achieve the effect of improving universality, overcoming brittleness, and improving mutual compatibility

Inactive Publication Date: 2012-09-19
徐国财
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above research results or the invention patent applied for are essentially different from the patent application in the modification mechanism of coal tar pitch

Method used

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  • Chemical modification method of coal pitch with unsaturated thermoplastic elastomer
  • Chemical modification method of coal pitch with unsaturated thermoplastic elastomer

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The specific preparation steps of the chemical modification of coal tar pitch by unsaturated thermoplastic elastomer (SBS) are as follows:

[0028] Mix 100 grams of coal tar pitch with a softening point of 65°C and 200 grams of organic solvent quinoline, stir at room temperature for 3 hours, stand still and filter to obtain a mother liquor, which is concentrated by evaporation at 150°C and vacuum-dried at 80°C to obtain refined coal tar pitch. 100 grams of refined coal tar pitch were heated to 80° C. under a nitrogen atmosphere and started to stir. Continue to heat up to 110°C, add 5 grams of SBS with a particle size of 100 mesh, SBS is a styrene-butadiene-styrene triblock copolymer copolymerized with styrene monomer and butadiene monomer, and the comonomer ratio is 40:60; heat up to 130°C at a heating rate of 2°C / min, so that the SBS particles basically disappear in the coal tar pitch matrix, then add 3 grams of boron trifluoride BF 3 , the reaction was stopped after ...

Embodiment 2

[0030]Add 100 grams of coal tar pitch with a softening point of 65°C to 200 grams of organic solvent tetrahydrofuran, stir at room temperature for 3 hours, stand still, and filter to obtain a mother liquor, which is concentrated by evaporation at 150°C and vacuum-dried at 80°C to obtain refined coal tar pitch. 100 grams of refined coal tar pitch were heated to 80° C. under a nitrogen atmosphere, and stirring was started. Continue to heat up to 110°C, add 15 grams of SBS with a particle size of 100 mesh, SBS is a styrene-butadiene-styrene triblock copolymer copolymerized with styrene monomer and butadiene monomer, and the comonomer ratio is 40:60; heat up to 150°C at a heating rate of 2°C / min. To make the SBS particles basically disappear in the coal tar pitch matrix, add 5 grams of boron trifluoride BF at this time 3 , the reaction was stopped after 5 hours of reaction to obtain SBS chemically modified coal tar pitch with a softening point of 98°C.

Embodiment 3

[0032] Add 100 grams of coal tar pitch with a softening point of 65°C to 200 grams of organic solvent toluene, stir at room temperature for 3 hours, let it stand, and filter to obtain a mother liquor. The mother liquor is concentrated by evaporation at 150°C and vacuum-dried at 80°C to obtain refined coal tar pitch. 100 grams of refined coal tar pitch were heated to 80° C. under a nitrogen atmosphere, and stirring was started. Continue to heat up to 100°C, add 2 grams of SBS with a particle size of 100 mesh, SBS is a styrene-butadiene-styrene triblock copolymer copolymerized with styrene monomer and butadiene monomer, and the comonomer ratio is 40:60; continue to heat up to about 140°C at 2°C / min. To make the SBS particles basically disappear in the coal tar pitch matrix, add 2 grams of catalyst aluminum chloride AlCl at this time 3 , after 2 hours of reaction, stop the reaction. The SBS modified coal tar pitch with a softening point of 78°C was obtained.

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Abstract

The invention relates to a chemical modification method of coal pitch with an unsaturated thermoplastic elastomer SBS (styrene-butadiene-styrene block polymer), which comprises the following steps: mixing coal pitch and an organic solvent, stirring at room temperature for 3 hours, standing, filtering, concentrating the mother liquor by evaporation, and drying to obtain the refined coal pitch; heating the refined coal pitch to 80 DEG C in a nitrogen atmosphere, and starting stirring; continuing heating to 90-110 DEG C, and adding a 100-mesh styrene unsaturated thermoplastic elastomer, namely SBS of styrene monomer and butadiene monomer; and heating to 130-170 DEG C at the rate of 2 DEG C / minute until granules in the unsaturated thermoplastic elastomer basically disappear in the coal pitch substrate, adding a catalyst, such as boron trifluoride (BF3) or the like, and reacting to obtain the SBS-chemically-modified coal pitch. The modified coal pitch overcomes the brittleness in coal pitch, enhances the softening point of the coal pitch, and basically satisfies the performance requirements for coal pitch for high-grade highways or anticorrosive paint; and thus, the waste coal pitch is changed into valuable substances.

Description

technical field [0001] The invention belongs to the technical field of coal tar pitch chemical materials used for high-grade roads, and in particular relates to a method for chemically modifying coal tar pitch by using an unsaturated thermoplastic elastomer (SBS). Background technique [0002] Pitch resin is a condensed polycyclic polynuclear aromatic compound resin. Due to the different condensation degrees, it is divided into three stages: A, B, and C. The A stage is a viscous liquid at room temperature; the B stage is a brittle solid and is easily soluble in organic solvents. , can be heated and melted, it is a thermoplastic resin; the B-stage resin is further polycondensed, that is, the C-stage resin becomes a thermosetting resin. A-stage or B-stage asphalt can be used as road asphalt after modification. It is an important measure to enhance and improve the road performance of asphalt mixture by using polymer to modify road asphalt. The bitumen used as the modification...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C3/02C09D195/00C09D5/08
Inventor 徐国财李欣王雪礼赵建峰李少兵张晓梅朱文晶张艳红
Owner 徐国财
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