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Non-pollution type polyurethane sealing material and preparation method thereof

A sealing material, polyurethane technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of reduced tensile strength and elastic recovery rate, pollution can not be solved, surface pollution, etc., to achieve the effect of ensuring strength

Inactive Publication Date: 2015-06-10
HAIMEN MINGYANG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, in the prepared sealing material, the common problem is: although the performance of the workability and the performance of the new sample tested according to the conventional indicators can meet the requirements, with the prolongation of the service life, the small Molecular weight solvents and additives will continue to migrate and precipitate, which not only causes the deterioration of the properties of the bulk material (such as the decrease of tensile strength and elastic recovery rate, the decrease of elongation at break, etc.), but also makes the surface of the sealing material absorb various dust, Surface pollution caused by impurities, etc., greatly affects the quality of building exterior decoration
For two-component reactive polyurethane sealing materials, it is difficult to achieve the corresponding anti-pollution effect only by changing the filler, but it is necessary to select each component and improve the preparation method
Japanese Patent Laid-Open 7-197011 (August 1, 1995) and Japanese Patent Laid-Open 10-17640 (January 20, 1998) adopt acrylic acid or substituted acrylic acid and polyol polyether esterification products to polymerize and then react with diisocyanate It is made into a prepolymer containing a certain amount of isocyanate groups. Since polyacrylate chain links are added to the polymer matrix, the aging resistance of the material is improved to a certain extent, but the esterification and polymerization reactions still need to be carried out in a solvent. At the same time, an initiator needs to be added, so there is still a certain amount of low-molecular compounds in the final cured body, and the pollution caused by the migration and precipitation of low-molecular compounds cannot be solved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In a 500ml four-necked round bottom flask equipped with a stirrer and a thermometer, add 250 grams of glycol polyethers with a molecular weight of more than 1200 and 100 grams of triol polyethers with a molecular weight of less than 4000, and heat up to 40 under stirring. ~50°C and dehydration under vacuum of 10~25mmHg, then protected with dry nitrogen. Add 60 grams of TDI at 50-60°C, heat up to 70-85°C and react for 6-8 hours. The content of isocyanate group is 4.1% by sampling and the viscosity at room temperature is 8600MPa·S. agent.

[0032] Add 350 grams of triol polyether with molecular weight above 5000 and 150 grams of glycol with molecular weight below 10000 into a 1000ml stainless steel reactor with a strong stirrer, dehydrate under 10-20mmHg vacuum and continue adding to the surface for coupling treatment 450 grams of light calcium carbonate with a particle size of 150-500 nm, 185 grams of heavy calcium carbonate with a particle size of less than 1000 nm aft...

Embodiment 2

[0036]The equipment and method for preparing base and curing agent are the same as example 1. The active hydroxyl components used in base preparation are: 250 grams of glycol polyether with molecular weight below 4000, 150 grams of triol polyether with molecular weight above 3000, and 65 grams of diphenylmethane diisocyanate (MDI). , the isocyanate group content of the obtained base agent is 3.5%, and the viscosity is 6500MPa·S.

[0037] When preparing the curing agent, the active hydroxyl compound is 450 grams of triol polyether with molecular weight below 8000, 150 grams of glycol polyether with molecular weight below 10000, and 320 grams of light calcium carbonate with a particle size of 150-500 nm after coupling treatment on the surface 120 grams of heavy calcium carbonate with a particle size below 1000nm after coupling treatment on the surface, 0.15 grams of substituted benzotriazole light stabilizer, 1.5 grams of lead stearate, 6.8 grams of barium stearate, and 2.8 gram...

Embodiment 3

[0041] The equipment and method for preparing base and curing agent are the same as example 1. The active hydroxyl components used in base preparation are: 200 grams of glycol polyether with molecular weight below 5000, 250 grams of triol polyether with molecular weight above 7000, and 60 grams of diphenylmethane diisocyanate (MDI). , the isocyanate group content of the obtained base agent is 3.8%, and the viscosity is 6200MPa·S.

[0042] When preparing the curing agent, the active hydroxyl compound is 400 grams of triol polyether with molecular weight below 8,000, 200 grams of glycol polyether with molecular weight below 10,000, and 300 grams of light calcium carbonate with a particle size of 150-400 nm after coupling treatment on the surface. 100 grams of ground calcium carbonate with a particle size below 1000nm after coupling treatment on the surface, 0.1 grams of substituted benzotriazole light stabilizer, 2.5 grams of lead stearate, 5.8 grams of barium stearate, and 3.8 ...

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Abstract

The invention discloses a non-pollution type polyurethane sealing material and a preparation method of the non-pollution type polyurethane sealing material, and belongs to the field of building materials. The polyurethane sealing material is formed by mixing a base and a curing agent; the base is formed by a prepolymer which is prepared by performing reaction on polyisocyanates and active hydroxyl compounds; and the curing agent comprises polyether, a catalyst, filler, a light stabilizer and a heat stabilizer. The preparation method of the base and the curing agent comprises the following step that the steps of dehydration, degasification, mixed grinding and the like are carried out in an airtight reactor provided with electric stirring, a thermometer and a vacuumizing function. According to the non-pollution type polyurethane sealing material and the preparation method, the strength, the deformation performance, the abrasion resistance, the chemical corrosion resistance, the high-low temperature resistance performance of the material can be guaranteed, and the surface pollution and deterioration of the material can be avoided; and therefore, the non-pollution type polyurethane sealing material is an ideal sealing material.

Description

technical field [0001] The invention relates to a novel polyurethane sealing material and a preparation method thereof, which will not cause aging and pollution due to changes in the internal composition of the material due to changes in the environment during long-term use, and belongs to the technical field of building materials. Background technique [0002] As we all know, the two-component polyurethane material refers to the prepolymer containing a certain isocyanate group mainly formed by the reaction of polyisocyanate and hydroxyl-containing polyester or polyether as the base agent (or main agent), composed of active hydroxyl compounds, fillers, Solvents, additives and catalysts are mixed into a paste as a curing agent (or hardener). After being fully mixed, an esterification reaction occurs to form a compound containing urethane bonds, urea bonds, substituted urea bonds, ether bonds and A cross-linked polymer with ester bonds, thus a sealing material that can be appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/08C08G18/48C08K9/04C08K3/26C08K5/098C08K5/3475C09K3/10
Inventor 施勇
Owner HAIMEN MINGYANG IND
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