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Molded normal temperature curing urethane resin composition and preparation method thereof

A polyurethane resin, room temperature curing technology, applied in the field of chemical materials and its preparation, can solve the problems of inability to use in low temperature areas, difficult to grasp the curing speed, a large number of bubbles, etc., and achieve the effect of simple and easy preparation method and good application process performance.

Inactive Publication Date: 2009-09-30
胡旻辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Polyurethane resin is sensitive to moisture during the preparation process and reacts with water to generate CO 2 , prone to a large number of air bubbles, affecting the density and uniformity of the filled resin, and directly affecting the strength and elasticity of the resin
If it is used in the field, the environmental factors will have too much influence, temperature, humidity and the degree of dryness of the cement will have a negative impact on the curing process, and the curing speed is also difficult to control
Moreover, ordinary polyurethane resin has poor aging performance and low temperature performance, so it cannot be used outdoors, in the north or in other low temperature areas.

Method used

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  • Molded normal temperature curing urethane resin composition and preparation method thereof
  • Molded normal temperature curing urethane resin composition and preparation method thereof
  • Molded normal temperature curing urethane resin composition and preparation method thereof

Examples

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preparation example Construction

[0030] A kind of preparation method of pouring type normal temperature curing polyurethane resin composition comprises the following steps:

[0031] (1) Put the polymer polyol into the reactor, stir, vacuum dehydrate after heating up, add isocyanate after cooling down, and after heating up to react, prepare a prepolymer terminated with isocyanate, cool down for later use;

[0032] The polymer polyol is hydroxyl-terminated polybutadiene, or a mixture of hydroxyl-terminated polybutadiene and polytetrahydrofuran polyol, or a mixture of hydroxyl-terminated polybutadiene and polytetrahydrofuran-oxypropylene copolyether polyol; preferably hydroxyl-terminated Mixture of polybutadiene and polytetrahydrofuran-propylene oxide copolyether polyol;

[0033] The isocyanate is a mixture of one or more of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate and its derivatives, polymethylene phenyl polyisocyanate; preferably toluene diisocyanate, liquefied diphenyl Met...

Embodiment 1

[0041] Put 300g of hydroxyl-terminated polybutadiene (hydroxyl value 45mgKOH / g) into a one-liter four-necked bottle, stir and heat up to 100-120°C, dehydrate at -0.1MPa for two hours, cool down to 50-60°C, add toluene diisocyanate (TDI80) 30g, liquefy MDI 14g, then slowly raise the temperature to 90°C, keep warm, stir for two hours to prepare a prepolymer, cool down to below 50°C, and set aside.

[0042] Take 300g of prepolymer, add 150g of dibutyl phthalate, 48g of carbon black N550, 180g of silicon micropowder, 20g of calcium sulfate whiskers, 4g of calcium oxide, add 30g of coupling agent KH-560, defoamer BYK A- 530 6g, wetting agent BYK-9075 10g, antioxidant H-264 1.0g, ultraviolet light absorber UV-531 0.8g, stir well and discharge, packaged as Class A substance.

[0043] Dilute E-300 with dibutyl phthalate to a 50% solution, packaged as a category B substance.

[0044] Take 300g of the above-mentioned A-type substance and 16.6g of B-type substance, fully stir at room te...

Embodiment 2

[0053] Put 210g of hydroxyl-terminated polybutadiene (hydroxyl value 45mgKOH / g) and 90g of polytetrahydrofuran ether glycol (hydroxyl value 112mgKOH / g) into a one-liter four-necked bottle, stir and heat up to 100-120°C, and dehydrate at -0.1MPa After two hours, cool down to 50-60°C, add 57g of toluene diisocyanate (TDI 80), then slowly raise the temperature to 90°C, keep warm, stir for two hours, cool down to below 50°C, and prepare a prepolymer for later use.

[0054] Take 300g of prepolymer, add 108g of dibutyl phthalate, 1.0g of carbon black N550, 200g of silicon micropowder, 20g of calcium sulfate powder, 10g of calcium oxide, add 1.0g of coupling agent KH-560, defoamer BYK A -530 1.0g, wetting agent BYK-9075 1.0g, antioxidant H-264 10g, ultraviolet light absorber UV-531 15g, stir well and discharge, pack as A-type substance.

[0055] Dilute E-300 with dibutyl phthalate to a 50% solution, packaged as a category B substance.

[0056] Take 300g of the above-mentioned A-type...

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Abstract

The invention discloses molded normal temperature curing urethane resin composition and a preparation method thereof. The compound comprises A type substance and B type substance which are packed independently, wherein the A type substance comprises prepolymer prepared by polymer polylol and isocyanate, carbon soot, filling, ultraviolet light absorbing agent, chemical inhibitor, wetting agent, deicer, foam suppressor, coupling agent and plasticizer; the B type substance is chain extendor; and the ratio of the quantity of active functional group substance of the B type substance to the quantity of active functional group substance of the A type substance is 0.8-1.0. The preparation method comprises the following steps: preparing and cooling the prepolymer capped by the isocyanate for reservation; preparing the A type substance; directly packing the chain extendor or packing the chain extendor after being diluted to be used as the B type substance; evenly mixing the measured A and B types of substances and maintaining the mixture under normal temperature to obtain the molded normal temperature curing urethane resin composition. The molded normal temperature curing urethane resin composition has good constructional processing property and is easy and convenient to prepare.

Description

technical field [0001] The invention relates to a chemical material and a preparation method thereof, in particular to a pouring type room-temperature-cured polyurethane composition and a preparation method thereof. Background technique [0002] With the progress of the society, the rapid development of the national economy, the rapid increase of the flow of people and goods, the capacity of ordinary railways is obviously insufficient; Moreover, with the increase of vehicle speed, the ballast pulverization of the ballasted track and the accumulative deformation rate of the ballast bed will be accelerated, resulting in difficulties in maintenance. Compared with ballasted track, ballastless track has better structural continuity and rigidity uniformity, which improves track smoothness and ride quality; track stability is good, and the workload of line maintenance and repair is significantly reduced, thereby reducing Interference with train operation, high line utilization rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/70C08G18/66C08G18/10
Inventor 胡旻辉
Owner 胡旻辉
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