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A kind of preparation method of epoxy modified aliphatic polythiourethane

A polythiourethane and epoxy modification technology, applied in the field of polyurethane composite materials, can solve the problems of poor adhesion and chemical resistance, achieve excellent elasticity and compactness, excellent toughness and wear resistance, and improve The effect of overall performance

Active Publication Date: 2016-06-08
ANHUI ANDA HUATAI NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polythiourethane has the disadvantages of poor adhesion and chemical resistance, which can be improved by epoxy resin

Method used

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  • A kind of preparation method of epoxy modified aliphatic polythiourethane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The specific preparation operation steps of epoxy modified aliphatic polythiourethane elastomer are as follows:

[0033] 1) Preparation of hydroxyl-terminated polysulfide-modified aliphatic polyurethane prepolymer

[0034] Under the protection of dry nitrogen, vacuum dehydrated liquid polysulfide LP3 (Mn=1000): 7 grams, polytetrahydrofuran ether diol (Mn=2000): 50 grams, isophorone diisocyanate (IPDI): 3.5 gram of the mixture was added to the reactor at one time, and the temperature was controlled at 70°C for 3 hours to the end under mechanical stirring, and the system was cooled to 30°C to obtain a terminally active hydrogen prepolymer;

[0035] 2) Preparation of isocyanate-terminated epoxy resin modified aliphatic polyurethane adduct

[0036] Epoxy H 12 E-44: Add 2.4 grams of ethylenediamine dropwise to 7.1 grams of ethylenediamine at 30°C within 20 minutes, keep the reaction at 30°C for 0.5 hours, raise the reactant to 65°C, add it dropwise to 26.2 grams of IPDI wi...

Embodiment 2

[0046] Under the protection of dry nitrogen, vacuum dehydrated liquid polysulfide LP3 (Mn=1000): 6.4 grams, polyhexamethylene adipate diol (Mn=2000): 45 grams, isophorone diisocyanate ( IPDI): 3.1 g of the mixture was added to the reactor at one time, and the temperature was controlled at 70°C under mechanical stirring to react to the end; a terminal active hydrogen prepolymer was obtained.

[0047] Cool the system down to 40°C, put the epoxy resin H 12 E-44: Add 2.15 grams of ethylenediamine dropwise to 6.4 grams of ethylenediamine at 30°C within 20 minutes, keep the reaction at 30°C for 0.5 hours, add the reactant dropwise to 23.3 grams of IPDI at 65°C within 30 minutes, and keep it for 1 hour. This results in an isocyanate-terminated adduct.

[0048] Add 31.9 grams of adducts to 54.5 grams of prepolymer, add dropwise 0.1 grams of stannous octoate and 0.3 grams of dibutyltin dilaurate, react at 70 ° C to the end, reduce the system temperature to 35 ° C, and obtain epoxy mod...

Embodiment 3

[0052] Under the protection of dry nitrogen, vacuum dehydrated liquid polysulfide LP3 (Mn=1000): 7 grams, polycarbonate 1,6-hexanediol (Mn=2000): 50 grams, isophorone di Isocyanate (IPDI): 3.6 grams of the mixture was added to the reactor at one time, and the temperature was controlled at 70°C under mechanical stirring to react to the end; an active hydrogen-terminated prepolymer was obtained.

[0053] Cool the system down to 40°C, put the epoxy resin H 12 E-44: Add 2.3 grams of ethylenediamine dropwise to 7.0 grams of ethylenediamine at 30°C within 20 minutes, keep the reaction at 30°C for 0.5 hours, add the reactant dropwise to 26.0 grams of IPDI at 65°C within 30 minutes, keep it for 1 hour, and get Isocyanate-terminated adducts.

[0054] Add 35.3 grams of adducts to 60.6 grams of prepolymer, add 0.01 grams of stannous octoate and 0.3 grams of dibutyltin dilaurate dropwise, react at 70°C to the end, lower the system temperature to 35°C, and obtain epoxy modified aliphatic...

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Abstract

The invention relates to a preparation method of epoxy modified aliphatic polythiourethane. The method comprises the following steps: reacting polysulfur, macromolecular polyalcohol and aliphatic isocyanate to synthesize an active-hydrogen-terminated prepolymer; reacting alicyclic epoxy resin with polyisocyanate to generate an isocyanate-terminated addition product; reacting the active-hydrogen-terminated prepolymer with the isocyanate-terminated addition product to obtain epoxy modified aliphatic polythiourethane; and mixing the epoxy modified aliphatic polythiourethane and a curing agent under the conditions of heating and vacuum, and aging to obtain the product, wherein the curing agent is composed of polyamine and a coupling agent. The Shore hardness is 85-95A, the shear tensile strength is 8-20 MPa, the pull strength is 7-15 MPa, the air permeability is 0.3-0.7 d<m3> / minute, the epoxy modified aliphatic polythiourethane has no changes after ultraviolet irradiation for 46 hours (60+ / -2 DEG C), and the tensile strength loss is 2.8-7.1% (100% R.H, 25 DEG C and 1 year). The epoxy modified aliphatic polythiourethane is used for paving a steel deck, and satisfies the requirements for binding property, high / low temperature resistance, aging resistance, chemical resistance, water seepage resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of polyurethane composite materials, and in particular relates to a preparation method of epoxy-modified aliphatic polythiourethane. Background technique [0002] Aromatic polyurethane has the characteristics of excellent comprehensive performance and relatively low price, but as an elastomer, coating, and adhesive material, it also has shortcomings, such as poor compactness (in other words, better air permeability, which is better than synthetic leather and natural leather. , fabrics and other aspects of the application), chemical resistance is not outstanding, etc., there is a big defect that is poor aging resistance, so pavement materials such as pavements or bridge decks, especially surface paving materials , the aliphatic polyurethane with excellent aging resistance must be selected, and at the same time, the epoxy resin without aromatic ring must also be selected. From the basic principle of polyureth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/64C08G18/58C08G18/48C08G18/42C08G18/44C08G18/12
CPCC08G18/12C08G18/4081C08G18/4238C08G18/4854C08G18/584C08G18/6453C08G18/755C08G18/758C08G59/20C08G59/5026C08G18/58
Inventor 许戈文熊潜生戴震何纪慧
Owner ANHUI ANDA HUATAI NEW MATERIALS CO LTD
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