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Composite polyurethane modifier for road asphalt

A composite polyurethane and road asphalt technology is applied in the field of road asphalt modifiers to meet paving requirements, prolong service life and achieve good storage stability.

Inactive Publication Date: 2013-10-16
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To overcome the defects of existing asphalt modifiers

Method used

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  • Composite polyurethane modifier for road asphalt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The formula of composite polyurethane modifier is as follows: 60 parts by weight of the NCO-terminated prepolymer obtained by the reaction of diphenylmethane diisocyanate and vegetable oil polyol (referring to the embodiment 3 of CN101386563A), 35 parts by weight of The polymer polyol (Bayer company Arol 24-32) of average molecular weight 3500, the bismuth isooctanoate of 0.8 weight part, the aminopropyltrimethoxysilane of 3 weight parts, the sebacic acid of 1.2 weight part, wherein the pre The free NCO groups of the polymer are in excess of 220 mol % relative to the active hydrogen of the hydroxyl + amino + carboxylic acid groups in the polymer polyol + aminopropyltrimethoxysilane + sebacic acid. Based on the total amount of modifier added as 25% by weight of the base asphalt, the modifier and No. 70 straight-run road asphalt were dispersed and mixed at 130°C for 2 hours, and the softening point of the modified asphalt was determined to be 63.7°C after aging and cooling...

Embodiment 2

[0037] The formula of composite polyurethane modifier is as follows: 55 parts by weight of the NCO-terminated prepolymer formed by the reaction of diphenylmethane diisocyanate and polyoxyethylene-polyoxypropylene copolyether polyol of weight average molecular weight 5500, 1 part by weight 1,4-butanediol, 15 parts by weight of polymer polyol (Bayer company Arol 24-32), 0.05 parts by weight of bismuth octoate, 3.95 parts by weight of anilinomethyltriethoxysilane, 25 parts by weight of adipic acid, where the free NCO groups of the NCO-terminated prepolymer are reactive relative to the hydroxyl + amino + carboxylic acid groups in 1,4-butanediol + aminomethyltrimethoxysilane + adipic acid The hydrogen excess is 335 mol%. Based on the total amount of modifier added as 15% by weight of the base asphalt, the modifier was dispersed and mixed with No. 70 straight-run road asphalt at 135°C for 2 hours. After aging and cooling to room temperature, the softening point of the modified aspha...

Embodiment 3

[0039] The formula of composite polyurethane modifier is as follows: 35 parts by weight of the NCO-terminated prepolymer formed by the reaction of toluene diisocyanate and polytetrahydrofuran-oxyalkylene copolyether with a weight average molecular weight of 1000, 1 part by weight of trimethylolpropane, 12 parts by weight of Bayer's Arol 24-32 polymer polyol, 15 parts by weight of polyoxyethylene-polyoxypropylene copolyetheramine of weight average molecular weight 4000, 0.1 parts by weight of bismuth octoate, 3.9 parts by weight of anilinomethyltriethyl Oxysilane, 32 parts by weight of adipic acid, 1 part by weight of o-phthalic diisocaprylic anhydride, wherein the free NCO groups of the NCO-terminated prepolymer are multivalent relative to the trimethylolpropane + Arol 24-32 polymer Alcohol+polyoxyethylene-polyoxypropylene copolyetheramine+anilinomethyltrimethoxysilane+adipic acid+hydroxyl group+amino group+carboxylic acid group+acid anhydride group contained in adipic anhydrid...

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Abstract

The invention relates to a composite polyurethane modifier for road asphalt, comprising the components capable of forming a polyurethane structure, such as a polyisocyanate prepolymer or polymer of an NCO (N=C=O) terminal, a terminal hydroxyl or / and amino compound, organic polyurethane catalyst and the like and other performance adjusting components. By using the modifier, a colloid structure of the asphalt can be improved, the heat resistance, the temperature sensitivity and the like of matrix asphalt can be greatly improved, and good compatibility, good storage stability as well as stable and durable modifying effect of the modified asphalt can be obtained. Meanwhile, the mixing processing process of the modifier and the matrix asphalt is simple, the processing temperature is low, and thus, the energy consumption is reduced, and the aims of low carbon and environment protection are realized.

Description

technical field [0001] The method relates to a modifier for road asphalt, in particular to using a compound isocyanate material to form a polyurethane structure with base asphalt through chemical reaction to improve the performance of base asphalt. Background technique [0002] The rapid development of transportation has put forward higher requirements for the performance of asphalt roads and modified asphalt. On the one hand, the modified asphalt is required to have high stability and is not easy to produce rutting. On the other hand, the modified asphalt is required to have fatigue resistance and low temperature crack resistance. , to prolong the service life of the pavement, and at the same time, it is hoped that the processing process of modified asphalt can be simplified, energy consumption can be reduced, and low-carbon environmental protection can be achieved. Compared with modified asphalt for other purposes, road modified asphalt needs to achieve a substantial impro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L75/04C08G18/65C08G18/64E01C7/18E01C23/09E01C13/06
Inventor 张昊吴世超盛基泰华卫琦丁建生
Owner WANHUA CHEM GRP CO LTD
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