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Organic silicon modified polyurethane sealing agent

A silicone and sealant technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of affecting the strength of the sealant, human and environmental hazards, insufficient strength, etc., and increase environmental performance. , not easy to whitish, good sealing performance

Inactive Publication Date: 2017-09-12
SUZHOU JINQIANG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most domestic and foreign markets use excess isocyanate and polyether to react under certain conditions to prepare PUR sealants or adhesives. However, under certain conditions, PUR sealants must be used in conjunction with primers for bonding, which is inconvenient to operate.
[0003] PUR sealants (adhesives) contain isocyanate groups, which are harmful to the human body and the environment; moreover, primers are required for the bonding and sealing of PUR to glass, metal, ceramics, etc. Releases CO when cured under wet conditions 2 The gas is easy to generate bubbles to affect the strength of the sealant, and the strength is not enough at high temperature

Method used

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  • Organic silicon modified polyurethane sealing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This example relates to a silicone-modified polyurethane sealant, which is prepared from the following raw materials: 60 g of toluene diisocyanate, 200 g of polyether N220, 200 g of polyether 3050, 3 g of epoxy resin E51, and 20 g of silicone Y-9669.

[0031] Its preparation method comprises the following steps:

[0032] 5) Heat up polyether N220 and polyether 3050 to 120° C., keep for 2 hours, and perform dehydration treatment. After dehydration treatment, cool down polyether N210 and polyether 3050 to 50° C. for use.

[0033] 6) Under the protection of nitrogen, polyether 3050 and N220 are put into toluene diisocyanate successively (at an interval of half an hour) under the condition of 75-80°C and reacted for 2 hours to form a polyurethane prepolymer;

[0034] 3) The polyurethane prepolymer and epoxy resin E51 are reacted for 1 to 1.5 hours at 75 to 80°C under the protection of nitrogen to generate epoxy-modified polyurethane prepolymer (EP-PUR);

[0035] 4) The EP-...

Embodiment 2

[0037] This embodiment relates to a silicone-modified polyurethane sealant, which is prepared from the following raw materials: 100 g of toluene diisocyanate, 470 g of polyether N220, 350 g of polyether N3050, 50 g of silicone Y-9669, and 10 g of epoxy resin E51.

[0038] Its preparation method comprises the following steps:

[0039] 1) Raise the temperature of polyether N220 and polyether 3050 to 120°C respectively, keep it for 2 hours, and perform dehydration treatment. After the dehydration treatment is completed, cool down the temperature of polyether N210 and polyether 3050 to 50°C for use.

[0040] 2) Under the protection of nitrogen, polyether 3050 and N220 are put into toluene diisocyanate successively (with an interval of half an hour) under the condition of 75-80°C and reacted for 2 hours to form a polyurethane prepolymer;

[0041] 3) The polyurethane prepolymer and epoxy resin E51 are reacted for 1 to 1.5 hours at 75 to 80°C under the protection of nitrogen to gener...

Embodiment 3

[0044] This embodiment relates to a silicone-modified polyurethane sealant, which is prepared from the following raw materials: 80 g of toluene diisocyanate, 250 g of polyether N220, 320 g of polyether N3050, 30 g of silicone Y-9669, and 5 g of epoxy resin E51.

[0045] Its preparation method comprises the following steps:

[0046] 1) Raise the temperature of polyether N220 and polyether 3050 to 120°C respectively, keep it for 2 hours, and perform dehydration treatment. After the dehydration treatment is completed, cool down the temperature of polyether N210 and polyether 3050 to 50°C for use.

[0047] 2) Under the protection of nitrogen, polyether 3050 and N220 are put into toluene diisocyanate successively (with an interval of half an hour) under the condition of 75-80°C and reacted for 2 hours to form a polyurethane prepolymer;

[0048] 3) The polyurethane prepolymer and epoxy resin E51 are reacted for 1 to 1.5 hours at 75 to 80°C under the protection of nitrogen to generat...

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PUM

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Abstract

The invention relates to an organic silicon modified polyurethane sealing agent. The organic silicon modified polyurethane sealing agent is prepared from, by mass, 60-100 parts of toluene diisocynate, 240-470 parts of polyether N220, 200-350 parts of polyether 3050, 3-10 parts of epoxy resin E51 and 40-100 parts of organic silicon Y-9669. The sealing agent has advantages that by selection of the organic silicon Y-9669 serving as a coupling agent in a modification process, the defect of harmfulness of isocyanic acid groups in PUR (polyurethane) hot-melt adhesives to human bodies and environments are completely eliminated owing to parahelium; organic silicon which is a primer intrinsically avoids inconvenience of primer utilization in adhesion of materials such as metals and glass with the PUR hot-melt adhesives (sealants), pollution prevention, environmental friendliness, convenience in operation and the like are achieved, and a prepared product is less prone to whitening and can be used as hot-melt adhesives and sealants.

Description

technical field [0001] The invention relates to the technical field of sealants, in particular to an organosilicon-modified polyurethane sealant. Background technique [0002] At present, most domestic and foreign markets use excess isocyanate and polyether to react under certain conditions to prepare PUR sealants or adhesives. However, under certain conditions, PUR sealants must be bonded with primers, which is inconvenient to operate. [0003] PUR sealants (adhesives) contain isocyanate groups, which are harmful to the human body and the environment; moreover, primers are required for the bonding and sealing of PUR to glass, metal, ceramics, etc. Releases CO when cured under wet conditions 2 The gas is easy to generate bubbles to affect the strength of the sealant, and the strength is not enough at high temperature. Contents of the invention [0004] The purpose of this invention is to provide a kind of organosilicon modified polyurethane sealant, prepared by the follo...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/48C08G18/58C08G18/61C09J175/08
CPCC08G18/7614C08G18/12C08G18/4804C09J175/08C08G18/58C08G18/61
Inventor 曹建强刘钾培
Owner SUZHOU JINQIANG NEW MATERIALS
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