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Polyurethane sealant and preparation method and application thereof

A polyurethane sealant and reactor technology, applied in the field of sealant, can solve problems such as peeling of sealant, high tensile modulus, damage to the joint surface, etc., and achieve the effects of prolonging service life, reducing modulus, and shortening maintenance costs

Active Publication Date: 2016-02-17
BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem that the tensile modulus of the existing sealant is too high, which easily causes the sealant to peel off or damage the joint surface, and provides a polyurethane sealant and its preparation method and application

Method used

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  • Polyurethane sealant and preparation method and application thereof
  • Polyurethane sealant and preparation method and application thereof
  • Polyurethane sealant and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides a polyurethane sealant, the specific preparation method is as follows:

[0037] Prepare component A:

[0038] 70 parts of polyether polyols (including 40 parts of polyether diols, Dow Chemical 2000LM, 30 parts of polyether trihydric alcohols, Dow Chemical 2471) and 6 parts of plasticizer (diisooctyl phthalate ester) into the first reactor, stirred and heated to 110-120°C, heat-preserved and vacuumed until the moisture content in the reactor is less than 0.05wt%, wherein, the time for heat-preserved and vacuumed is 0.5-1 hour;

[0039] Cool the above reactor to 70°C and add 24 parts of TDI, stir at this temperature for 10-30 minutes, then continue to heat up to 80±2°C, keep warm for 2-3 hours, then cool down to obtain component A.

[0040] Prepare B component:

[0041] Add 47 parts of liquid filler (including 37 parts of diisooctyl phthalate, 10 parts of dibutyl phthalate), and 10 parts of curing agent Unilink4200 into the second reactor, and r...

Embodiment 2

[0045] This embodiment provides a polyurethane sealant, the specific preparation method is as follows:

[0046] Prepare component A:

[0047] 75 parts of polyether polyols (including 35 parts of polyether diols, Dow Chemical 2000LM, 40 parts of polyether triols, Dow Chemical 2471) and 1 part of plasticizer (diisooctyl phthalate ester) into the first reactor, stirring and heating up to 115°C, heat preservation and vacuumization until the moisture content in the reactor is less than 0.05wt%, wherein the heat preservation and vacuumization time is 40 minutes;

[0048] Lower the temperature of the above reactor to 70°C and add 24 parts of TDI, stir at this temperature for 20 minutes, then continue to raise the temperature to 80±2°C, keep it warm for 2.5 hours, then lower the temperature to obtain component A.

[0049] Prepare B component:

[0050]Mix 45 parts of liquid filler (including 30 parts of diisooctyl phthalate, 10 parts of dibutyl phthalate, 5 parts of chlorinated paraf...

Embodiment 3

[0058] This embodiment provides a polyurethane sealant, the specific preparation method is as follows:

[0059] Prepare component A:

[0060] 60 parts of polyether polyols (including 35 parts of polyether diols, Dow Chemical 2000LM, 25 parts of polyether trihydric alcohols, Dow Chemical 2471) and 20 parts of plasticizer (diisodecyl phthalate ester) into the first reactor, stirring and heating up to 110°C, heat preservation and vacuumization until the moisture content in the reactor is less than 0.05wt%, wherein the heat preservation and vacuumization time is 0.5 hours;

[0061] Lower the temperature of the above reactor to 70°C and add 20 parts of TDI, stir at this temperature for 10 minutes, then continue to raise the temperature to 80±2°C, keep it warm for 2 hours, then lower the temperature to obtain component A.

[0062] Prepare B component:

[0063] Add 25 parts of liquid filler (including 15 parts of diisooctyl phthalate, 7 parts of dibutyl phthalate, 3 parts of chlori...

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Abstract

The invention provides a polyurethane sealant and a preparation method and application of the polyurethane sealant. The polyurethane sealant is prepared from a component A and a component B, wherein a polyurethane prepolymer is formed by polyether polyol and methylbenzene-2,4-diisocyanate in the component A; polyurethane molecular chain segments are provided with branch chains after the polyurethane prepolymer is cured by a curing agent, a plasticizing effect is obtained, the modulus of the material is reduced, and the modulus is below 0.2MPa under an environment that the temperature is 20 DEG C below zero. Because the polyurethane molecular chain segments are provided with the branch chains, and the branch chains have plasticizing performance, the polyurethane sealant can still have lower modulus even though a plasticizer migrates after long-time curing of the polyurethane sealant, and the service life of the polyurethane sealant is prolonged; the polyurethane sealant has self-healing performance, so that self healing can be obtained when the polyurethane sealant is damaged by an external force; the polyurethane sealant has repetitive adhesion performance; in addition, the requirements on the temperature and the humidity of an external environment are not high, and low-temperature construction can be carried out; the polyurethane sealant is suitable for all kinds of fields and is specifically suitable for caulking of buildings, road bridges and ballastless tracks of high-speed railway.

Description

technical field [0001] The invention belongs to the technical field of sealants, and in particular relates to a polyurethane sealant and its preparation method and application. Background technique [0002] Sealant (sealant / sealingglue) is a sealing material that deforms with the shape of the sealing surface, is not easy to flow, and has a certain degree of adhesion. It is an adhesive used to fill the configuration gap and seal it. It is widely used in the sealing of construction, transportation, electronic instruments and parts. [0003] The inventors have found that there are at least the following problems in the prior art: the modulus refers to the ratio of stress to strain of a material under stress. When the sealant is used in construction or civil engineering to join the joints of clay or concrete masonry walls, if the tensile modulus of the sealant is too high, it is easy to cause the sealant to peel off or damage the joint surface. [0004] When the sealant is us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J11/06C09J11/08C09J11/04C08G18/76C08G18/48C09K3/10
Inventor 段存业王新锋段文锋郑先军
Owner BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD
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