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A kind of slow swelling type water-swellable polyurethane sealant and preparation method thereof

A polyurethane sealant, water-swellable technology, applied in the field of sealant, can solve the problems of slow expansion effect and achieve fast expansion speed, stable performance and high expansion ratio

Active Publication Date: 2020-11-06
GUANGDONG PUSTAR SEALED RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN102408866B adopts random block polyether and water-absorbing resin to prepare a kind of expansion single-component polyurethane sealant, the maximum volume expansion rate can reach 400%, but it can not achieve slow expansion effect
However, there is no slow expansion type water-swellable polyurethane sealant in the prior art

Method used

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  • A kind of slow swelling type water-swellable polyurethane sealant and preparation method thereof
  • A kind of slow swelling type water-swellable polyurethane sealant and preparation method thereof
  • A kind of slow swelling type water-swellable polyurethane sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A slow-swelling water-swellable polyurethane sealant, made of the following components in parts by weight:

[0042]

[0043]

[0044] Wherein, the slow expansion type polyurethane prepolymer is made of the following components by weight percentage:

[0045]

[0046] Wherein, the NCO content of the slow expansion type polyurethane prepolymer is 0.5%-3.5%.

[0047] Wherein, the polyisocyanate is one of diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate, xylylene diisocyanate or 1,6-hexamethylene diisocyanate or any combination of two or more .

[0048] Wherein, the random block polyether diol, the isotactic block polyether diol, the random block polyether triol and the isotactic block polyether triol are all epoxy A block copolymer of propane, ethylene oxide and tetrahydrofuran, wherein the random block polyether diol, the isotactic block polyether diol, the random block polyether ternary The EO content of the alcohol and the isotactic...

Embodiment 2

[0064]

[0065] Wherein, the slow expansion type polyurethane prepolymer is made of the following components by weight percentage:

[0066]

[0067] Among them, the NCO content of the slow expansion polyurethane prepolymer is 1.76%.

[0068] Among them, the EO content of random block polyether diol is 70%, and the molecular weight is 4000; the EO content of isotactic block polyether diol is 70%, and the molecular weight is 4000; the EO content of random block polyether triol is 70%, the molecular weight is 6000; the EO content of the isotactic block polyether triol is 70%, and the molecular weight is 6000.

[0069] The preparation method of above-mentioned a kind of slow swelling type water-swellable polyurethane sealant, it comprises the following steps:

[0070] The first step, the preparation of slow-expansion polyurethane prepolymer: the random block polyether diol, isotactic block polyether diol, random block polyether triol, isotactic block polyether diol, isotact...

Embodiment 3

[0075]

[0076] Wherein, the slow expansion type polyurethane prepolymer is made of the following components by weight percentage:

[0077]

[0078]

[0079] Among them, the NCO content of the slow expansion polyurethane prepolymer is 1.48%.

[0080] Among them, the EO content of tactic block polyether diol is 37%, and the molecular weight is 4000; the EO content of isotactic block polyether diol is 37%, and the molecular weight is 4000; the EO content of random block polyether triol is 70 %, the molecular weight is 5000; the EO content of the isotactic block polyether triol is 70%, and the molecular weight is 5000.

[0081] The preparation method of above-mentioned a kind of slow swelling type water-swellable polyurethane sealant, it comprises the following steps:

[0082] The first step, the preparation of slow-expansion polyurethane prepolymer: the random block polyether diol, isotactic block polyether diol, random block polyether triol, isotactic block polyether ...

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Abstract

The invention relates to the technical field of sealants and particularly relates to a slow swelling type water-swelling polyurethane sealant and a preparation method thereof. The slow swelling type water-swelling polyurethane sealant contains a slow swelling type polyurethane prepolymer, a plasticizer, a filling, an adhesion promoter, a thixotropic agent, a super absorbent resin, a catalyst, an antioxidant and a dehydration agent, wherein the slow swelling type polyurethane prepolymer contains random block polyether glycol, isotactic block polyether glycol, random block polyether triol, isotactic block polyether triol, polyisocyanate, a plasticizer and a catalyst. The preparation method of the slow swelling type water-swelling polyurethane sealant comprises the following steps: (1) preparing the slow swelling type polyurethane prepolymer; (2) carrying out vacuum mixing; (3) drying, and mixing; and (4) mixing, and stirring. The sealant has a very good slow swelling effect, is particularly applicable to sealing and waterproof treatment of irregular seams such as anti-seeping treatment of deformation joints and post-cast strips in underground structure engineering, building of watersupply dams and urban pipe gallery engineering.

Description

technical field [0001] The invention relates to the technical field of sealants, in particular to a slow-expanding water-swellable polyurethane sealant and a preparation method thereof. Background technique [0002] Water-swellable materials have dual functions of elastic sealing and water-swell, and are widely used in tunnel construction, house construction, dam construction and other anti-seepage and water-leakage projects. They are generally divided into water-swellable rubber and water-swellable sealant. The water-swellable sealant is generally a polyurethane paste, which seals the amorphous joint without precise cutting, and there is no problem of poor matching between the product size and the construction joint. The construction is convenient and the application is becoming more and more extensive. After the water-swellable sealant is applied, it reacts with water vapor in the air to form a polyurethane elastomer. Since the main chain structure of the molecule contains...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/08C09J11/04C09J11/06C09J11/08C08G18/48
CPCC08G18/4816C08G18/4825C08G18/4829C08K2003/265C08K2201/011C08L2205/035C09J11/04C09J11/06C09J11/08C09J175/08C08L77/00C08L91/00C08K13/02C08K3/26C08K3/36C08K3/04
Inventor 李浩治詹锋张志文黄淑坚张志军
Owner GUANGDONG PUSTAR SEALED RAYON CO LTD
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