Double-component polyurethane caulking agent for repairing road cracks

A two-component polyurethane crack repair technology, applied in road repair, roads, roads, etc., can solve problems such as poor environmental protection, unsuitable crack repair construction technology, poor adhesion, etc., and achieve fast curing, good permeability, and adhesion The effect of high bonding strength

Active Publication Date: 2010-11-17
SHANGHAI HEDA POLYMERIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the disadvantages of poor environmental protection, poor adhesion and unsuitable crack repairing construction technology due to high viscosity in the pri

Method used

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  • Double-component polyurethane caulking agent for repairing road cracks

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preparation example Construction

[0052] Preparation of two-component polyurethane caulk composition

[0053] The preparation of the polyurethane composition of the present invention includes the preparation of component A and the preparation of component B.

[0054] Preparation of Component A

[0055] Component A is a polyol mixture, and its preparation method is: stirring and mixing polyether polyol, ethylene glycol, trimethylolpropane, hydrogen peroxide and tin catalyst according to the required weight ratio, heating and dehydrating.

[0056] Preferably the mixture is heated from 80 to 150°C, more preferably from 90 to 110°C. If it is lower than 80°C, it is difficult to remove moisture, and if it is higher than 150°C, hydrogen peroxide is easy to decompose, so that the caulking agent cannot generate enough free radicals during the curing process.

[0057] In order to avoid the internal moisture of component A from affecting the construction, component A needs to be dehydrated, such as vacuum dehydrati...

Embodiment 1

[0082] 1. Preparation of polyol mixture component A:

[0083] Mix 95 parts of GEP-330N polyether polyol, 5 parts of GJ-9701 polyether polyol, 6 parts of ethylene glycol, 5 parts of trimethylolpropane, 0.3 parts of hydrogen peroxide, 5 parts of NIAX black 028 color paste and dioctyl Add 0.001 parts of tin mercaptide catalyst into the reaction kettle, stir and mix, heat to 90-110°C, vacuumize to -0.09MPa for 2 hours, and pack and seal.

[0084] 2. Preparation of component B of polyurethane prepolymer mixture:

[0085] (1) Dehydration of polyester: first put a sufficient amount of L-144 poly(adipate-butylene glycol-ethylene glycol) ester into a reaction kettle with a stirrer and a vacuum system, and heat it to 120°C under stirring , and then evacuated to -0.09MPa, dehydrated for 120 minutes, and then cooled to room temperature for use.

[0086] (2) Preparation of prepolymer mixture: Put 100 parts of MDI-100 into another reaction kettle, under the protection of nitrogen, stir an...

Embodiment 2

[0089] 1. Preparation of polyol mixture component A:

[0090] Use 95 parts of GEP-360N polyether polyol, 5 parts of GJ-9701 polyether polyol, 6 parts of ethylene glycol, 5 parts of trimethylolpropane, 0.3 parts of hydrogen peroxide, 5 parts of NIAX black 028 color paste and dioctyl 0.001 part of tin mercaptide catalyst was prepared according to the same operating conditions and steps as in Example 1.

[0091] 2. Preparation of component B of polyurethane prepolymer mixture:

[0092] Pre-install the MDI-100 and 3051 is mixed evenly by weight 3:1. Using 100 parts of the mixed diphenylmethane diisocyanate, 80 parts of L-244 polyester, and 0.2 part of ferrous chloride, the polyurethane prepolymer mixture was prepared according to the same operating conditions and steps as in Example 1.

[0093] The viscosities of component A and component B at 25°C are listed in Table 1. Mix component A and component B uniformly at a volume ratio of 1:1, and the curing speed is shown in Table ...

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Abstract

The invention discloses a double-component polyurethane caulking agent for repairing road cracks. The double-component polyurethane caulking agent comprises a polyalcohol mixture component A and a polyurethane prepolymer mixture component B, wherein the component A comprises the following substances in part by weight: 100 parts of polyether polyalcohol, 5 to 20 parts of ethylene glycol, 0 to 10 parts of trimethylolpropane, 0.1 to 5 parts of hydrogen peroxide and 0.0001 to 0.01 part of tin catalyst; and the component B is a polyurethane prepolymer mixture prepared by the following method: polymerizing diphenyl-methane-diisocyanate and polyester polyalcohol with a molecular weight of 300 to 3,000 in a weight ratio of 100: 30-80 to obtain a polyurethane prepolymer, and mixing the polyurethane prepolymer and ferrous salt in an amount which is 0.1 to 1 percent of the total weight of the polyurethane prepolymer.

Description

technical field [0001] The invention relates to a two-component polyurethane caulking agent for repairing road cracks, its preparation method and its application for repairing irregular road cracks. Background technique [0002] my country's expressway and ordinary road network extend in all directions, but due to climate change and subsidence of the foundation structure, irregular cracks often appear on the road surface. With the extension and enlargement of cracks, the pavement will age rapidly and be seriously damaged. At the same time, the generation of cracks makes rainwater seep into the roadbed, which accelerates the damage of the roadbed, so that the road has to be resurfaced or overhauled. In order to avoid the expansion of road cracks and damage to the subgrade, protect the smoothness of the road surface, save road maintenance costs, and prolong the service life of the road, new cracks must be repaired in time to achieve the purpose of waterproofing and preventing...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/10C08G18/66E01C23/09
Inventor 万小龙幺庆金万乐鸣
Owner SHANGHAI HEDA POLYMERIC TECH
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