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Single-component polyurethane sealant prepared by using PAPI

A polyurethane sealant, one-component technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problem that polyurethane prepolymers cannot meet the use characteristics of polyurethane sealants and polyurethane waterproof coatings.

Active Publication Date: 2020-05-08
YUZHONGQING WATERPROOF MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] What the present invention is to solve is to solve the problem that the polyurethane prepolymer prepared by PAPI cannot meet the use characteristics of polyurethane sealant and polyurethane waterproof coating

Method used

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  • Single-component polyurethane sealant prepared by using PAPI
  • Single-component polyurethane sealant prepared by using PAPI
  • Single-component polyurethane sealant prepared by using PAPI

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of single-component polyurethane sealant prepared by PAPI, its composition and specific processing method are as follows:

[0029]

[0030] Wherein, the molecular weight of the first polyoxypropylene glycol is 5000, the molecular weight of the second polyoxypropylene glycol is 2000, the ultraviolet absorber is UV531 of BASF chemical, and the antioxidant is TINUVIN-B75 of BASF chemical, latent curing The thixotropic agent is ALT-401 from Elite Chemical, the thixotropic agent 1 is hydrophobic fumed silica R974 from Degussa Chemical, and the thixotropic agent 2 is organic bentonite SD-2 from Hemings Chemical.

[0031] In this embodiment, the one-component polyurethane sealant is prepared by the following method:

[0032] Step 1: Add the formula amount of the first polyoxypropylene diol and plasticizer into the mixer, stir at a temperature of 110-120°C and vacuumize and dehydrate, keeping the vacuum degree ≤ -0.09Mpa, to be tested When the moisture content is ≤0....

Embodiment 2

[0038] A kind of single-component polyurethane sealant prepared by PAPI, its composition and specific processing method are as follows:

[0039]

[0040]

[0041] Wherein, the molecular weight of the first polyoxypropylene glycol is 8000, the molecular weight of the second polyoxypropylene glycol is 1000, the ultraviolet absorber is UV1260 of BASF chemical, the antioxidant is TINUVIN-B75 of BASF chemical, latent curing The agent is CH-2 from Cenhao Chemical, and the thixotropic agent is Crayvallac SLX from Crayvallac Company in France.

[0042] In this embodiment, the one-component polyurethane sealant is prepared by the following method:

[0043] Step 1: Add the formula amount of the first polyoxypropylene diol and plasticizer into the mixer, stir at a temperature of 110-120°C and vacuumize and dehydrate, keeping the vacuum degree ≤ -0.09Mpa, to be tested When the moisture content is ≤0.005%, lower the temperature to 60-65°C, add 50% of the formula amount of PAPI, keep t...

Embodiment 3

[0049] A kind of single-component polyurethane sealant prepared by PAPI, its composition and specific processing method are as follows:

[0050]

[0051]

[0052] Wherein, the molecular weight of the first polyoxypropylene glycol is 6000, the molecular weight of the second polyoxypropylene glycol is 1000, the ultraviolet absorber is UV1260 of BASF chemistry, and the antioxidant is tetrakis [β-(3,5- Di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol ester, the latent curing agent is CH-2 of Cenhao Chemical Industry, and the thixotropic agent is Crayvallac SLX of Crayvallac Company in France.

[0053] In this embodiment, the one-component polyurethane sealant is prepared by the following method:

[0054] Step 1: Add the formula amount of the first polyoxypropylene diol and plasticizer into the mixer, stir at a temperature of 110-120°C and vacuumize and dehydrate, keeping the vacuum degree ≤ -0.09Mpa, to be tested When the moisture content is ≤0.005%, lower the ...

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Abstract

The invention discloses a single-component polyurethane sealant prepared by using PAPI (polymethylene polyphenyl isocyanate). The single-component polyurethane sealant mainly consists 25-35% of firstpolypropylene oxide dihydric alcohol, 0-10% of second polypropylene oxide dihydric alcohol, 1.2-1.7% of the PAPI, 0.6-2.2% of binary isocyanate, 15-25% of a plasticizer, 25-45% of a filler, 1-2% of apigment, 0.2-0.6% of a catalyst, 0.5-1.0% of an antioxidant, 0.5-1.0% of an ultraviolet light absorber, 1.0-3.0% of a bonding force accelerant, 2.0-3.0% of a physical water removal agent, 1.0-3.0% ofa chemical water removal agent, 1.0-2.0% of latent curing agent and 2-3% of a thixotropic agent. In the preparation process of the sealant, a step-by-step polymerization method is adopted for polymerization to fully react the PAPI with the polyether polyol, so the isocyanate functional group in the unreacted PAPI in the final curing process of the sealant is reduced, and the defect that the PAPI cannot be applied to the polyurethane sealant / waterproof coating with moderate curing speed due to too high reaction speed is overcome; and the prepared sealant is low in modulus, good in elasticity and excellent in durability.

Description

technical field [0001] The invention relates to a one-component polyurethane sealant prepared by using PAPI, and relates to the field of adhesives. Background technique [0002] As a widely used adhesive product, one-component polyurethane sealant has been widely recognized for its good bonding effect, high convenience of use and wide range of mechanical adjustment. , The isocyanates used in one-component polyurethane sealants are mainly toluene diisocyanate, modified diphenylmethane diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate. Among them, different isocyanate properties endow the product with different use characteristics. For example, the polyurethane sealant prepared by toluene diisocyanate has a lower viscosity, better scratching performance and mailing performance, and the sealant prepared by diphenylmethane diisocyanate has a better bonding effect. Good, low odor, the sealant prepared by hexamethylene diisocyanate has good aging resistance bec...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J11/06C09J11/04C09J11/08C08G18/76C08G18/75C08G18/73C08G18/48
CPCC09J175/08C09J11/06C09J11/04C09J11/08C08G18/7607C08G18/7664C08G18/7614C08G18/755C08G18/724C08G18/4808C08G18/73C08K2201/011C08K2003/265C08K2003/3045C08K13/04C08K5/12C08K3/26C08K7/26C08K3/34C08L91/00C08K3/30
Inventor 阮军李宏伟田益
Owner YUZHONGQING WATERPROOF MATERIALS CO LTD
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