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Normal-temperature solidification polyurethane elastomer waterproof material and preparation method thereof

A technology of polyurethane elastomer and waterproof material is applied in the field of building waterproof and anti-seepage material and its preparation, which can solve the problems of construction workers' health hazards, high toxicity, unfavorable environmental protection, etc. Effect

Inactive Publication Date: 2012-02-29
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the selected catalyzers of domestic production of polyurethane waterproof coatings are organotin catalysts, such as CN101100582A discloses a kind of two-component high-strength polyurethane waterproof coating, CN101113286A discloses a kind of polyurethane waterproof coating without coal tar and toluene solvent, CN101113288 A The production method of polyurethane waterproof coatings is disclosed. The catalysts used in these materials are dibutyltin dilaurate or stannous octoate. These catalysts are highly toxic, not conducive to environmental protection, and bring great harm to the health of production and construction personnel. harm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Component A: Add 64 parts of polyoxypropylene diol with a molecular weight of 1000 and 6.5 parts of dipropylene glycol (DPG) into the reaction kettle, raise the temperature to 100-110°C, vacuum dehydrate for 3 hours, then cool down to 50°C, add 29.5 parts of TDI, Incubate at 80-100°C for 2 hours to obtain a prepolymer with an NCO content of 12%.

[0019] Component B: Add 52 parts of polyoxypropylene diol with a molecular weight of 2000 into the reactor, dehydrate under vacuum at 100-110°C for 3 hours, then add 3,3'-dichloro-4,4'-diphenylmethane (MOCA ) 10 parts, after it is completely melted, add 2,4-diamino-3,5-dimethylthiochlorobenzene (TX-2) 6 parts, plasticizer 2,2,4-trimethyl-1 , 10 parts of 3-pentanediol diisobutyrate (TXIB), 1 part of antioxidant 1010 (tetrakis [β-(3,5 di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester), The catalyst is prepared by stirring 0.9 parts of bismuth naphthenate evenly. AB components are mixed and poured at normal tempe...

Embodiment 2

[0026] The preparation of A and B components is the same as in Example 1. The AB component is mixed according to the ratio of A / B / coal ash=100 / 81 / 120 when pouring. The physical properties of the material after curing for 7 days are as follows:

[0027] Tensile strength 9.1MPa

[0028] Elongation 405%

[0029] Tear strength 50.7N / mm

[0030] Hardness (Shore) 90A

Embodiment 3

[0032] Add 50 parts of polyoxypropylene diol with a molecular weight of 1000, 50 parts of polyoxypropylene diol with a molecular weight of 2000, and 8 parts of diethylene glycol (DEG) into the reactor, raise the temperature to 100-110°C, and dehydrate under vacuum After 3 hours, cool down to 50°C, add 28 parts of toluene diisocyanate, and react at 80-100°C for 2 hours to obtain a prepolymer with an NCO content of 4.5%, which is the A component. Component B is 13 parts of 3,5-dimethylthio-2,4-toluenediamine chain extender, 10 parts of 3,5-dimethylthio-2,6-toluenediamine, plasticizer 60 parts of dioctyl phthalate and 0.5 parts of bismuth isooctanoate as a catalyst are successively added into the reaction kettle and stirred evenly. Mix at room temperature at the ratio of A / B=100 / 60, and there will be no foaming phenomenon when applied on a wet base surface.

[0033] The physical properties of the material after curing for 7 days are as follows:

[0034] Tensile strength 15.1MPa...

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Abstract

The invention discloses a normal-temperature solidification polyurethane elastomer waterproof material and a preparation method thereof. The polyurethane waterproof material comprises a component A and a component B. Proportioning by weight percent, the component A is an isocyanate prepolymer with the content of 4-15% of isocyanic acid radical NCO; the component B comprises 0-65% of polyether glycol with the degree of functionality of 2-3 and the molecular weight of 1,000-5,000, 0.6-1.2% of organic bismuth catalyst, 20-27.5% of polybasic amine, 0-1.3% of antioxidant and 12.5-71.9% of plasticizer. The component A and the component B are mixed according to the weight ratio of 100(60-81); the material obtained by room-temperature solidification has the mechanical properties that the tensile strength is 15-35MPa, the tearing strength is 44-62N / mm, the breaking elongation rate is 405-840%, and the Shao' hardness is 75-90A.

Description

technical field [0001] The invention relates to a building waterproof and anti-seepage material and its preparation, in particular to a normal temperature curing polyurethane elastomer waterproof material and its preparation method. Background technique [0002] Polyurethane elastomers can be used as waterproof materials. They have many excellent properties such as wear resistance, oil resistance, acid and alkali resistance, hydrolysis resistance, chemicals and wide construction range. They entered my country's waterproof material market in the 1970s and are widely used in Roofing, underground engineering, and kitchen and bathroom are also widely used in large-scale construction fields such as heavy-duty roads and bridges, high-speed railway rail transit lines, etc., and have achieved good waterproof effects. It is one of the waterproof material products that are currently being promoted in my country. [0003] Polyurethane waterproof material, also known as polyurethane wate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/22C08G18/12
Inventor 周文英韦永继姚庆伦张利军张永陈战有
Owner LIMING RES INST OF CHEM IND
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