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Mildew-proof silane modified polyurethane sealant and preparation method thereof

A technology of polyurethane sealant and silane modification, applied in the field of sealant, can solve the problems of easy mildew, easy yellowing, and anti-mildew failure on the surface of the colloid, so as to improve the oxidation resistance and yellowing resistance, and improve the stability of the molecular structure. , lasting effect of anti-mildew effect

Inactive Publication Date: 2020-01-07
GUANGDONG PUSTAR SEALED RAYON CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the two-component epoxy adhesive has good mold resistance and high strength, but has the disadvantages of troublesome construction, easy yellowing, and poor bonding performance, especially the problem of easy yellowing. Difficult to use in crevice sealing of sanitary ware
Silicone sealant is cheap, has good elasticity, and various colors, but the main body has poor mildew resistance, stain resistance, and dirt resistance, and has a heavy smell, which is not environmentally friendly. The surface of the gel is prone to mold and is difficult to clean, which seriously affects the appearance.
In addition, most of the anti-mold glue on the market is additive type, and the loss of anti-mold agent after a period of use will lead to the failure of anti-mold

Method used

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  • Mildew-proof silane modified polyurethane sealant and preparation method thereof
  • Mildew-proof silane modified polyurethane sealant and preparation method thereof
  • Mildew-proof silane modified polyurethane sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A mildew-resistant silane-modified polyurethane sealant, comprising the following raw materials in parts by weight:

[0040]

[0041] The reinforcing filler is 12 parts of ground calcium carbonate, 10 parts of talcum powder and 28.5 parts of active calcium carbonate.

[0042] The mold-proof silane-modified polyurethane prepolymer includes the following raw materials in parts by weight:

[0043]

[0044] The mold-proof silane-modified polyurethane prepolymer is prepared by the following steps:

[0045] In parts by weight, polyoxypropylene diol, polyoxypropylene triol and dioctyl phthalate were added to a vacuum reaction device, dehydrated under vacuum conditions at a temperature of 108°C for 1.5 hours, and the moisture content of the mixture was controlled to be 150ppm; Then lower the temperature to 85°C, add dicyclohexylmethane diisocyanate and stannous octoate under the condition of nitrogen protection, and mix the reaction for 4 hours; finally, at a temperature...

Embodiment 2

[0049] A mildew-resistant silane-modified polyurethane sealant, comprising the following raw materials in parts by weight:

[0050]

[0051] The reinforcing filler is 10 parts of kaolin, 20 parts of active calcium carbonate and 18 parts of silicon micropowder.

[0052] The mold-proof silane-modified polyurethane prepolymer includes the following raw materials in parts by weight:

[0053]

[0054] The mold-proof silane-modified polyurethane prepolymer is prepared by the following steps:

[0055] In parts by weight, polyoxypropylene diol, polyoxypropylene triol and dioctyl phthalate were added to a vacuum reaction device, dehydrated under vacuum conditions at a temperature of 109°C for 1.8 hours, and the moisture content of the mixture was controlled to be 135ppm; Then lower the temperature to 90°C, add dicyclohexylmethane diisocyanate and stannous octoate under the condition of nitrogen protection, and mix and react for 5.5 hours; finally, at a temperature of 94°C, add γ...

Embodiment 3

[0059] A mildew-resistant silane-modified polyurethane sealant, comprising the following raw materials in parts by weight:

[0060]

[0061] The reinforcing filler is 11 parts of heavy calcium carbonate, 23 parts of light calcium carbonate and 17 parts of silicon micropowder.

[0062] The mold-proof silane-modified polyurethane prepolymer includes the following raw materials in parts by weight:

[0063]

[0064]

[0065] The mold-proof silane-modified polyurethane prepolymer is prepared by the following steps:

[0066] In parts by weight, polyoxypropylene diol, polyoxypropylene triol and dioctyl phthalate were added to a vacuum reaction device, dehydrated under vacuum conditions at a temperature of 108°C for 2 hours, and the moisture content of the mixture was controlled to be 185ppm; then Cool down to 93°C, add hexamethylene diisocyanate and dibutyltin diacetate under nitrogen protection conditions, mix and react for 5 hours; finally add γ-aminopropyltrimethoxysilan...

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Abstract

The invention relates to the technical field of sealants, and concretely relates to a mildew-proof silane modified polyurethane sealant and a preparation method thereof. The sealant comprises, by weight, 20-60 parts of a mildew-proof silane modified polyurethane prepolymer, 2-10 parts of a plasticizer, 30-60 parts of a reinforcing filler, 0.2-2 parts of a crosslinking agent, 0.02-1 part of a catalyst, 0.2-2 parts of a water removal agent, 0.1-1 part of an antioxidant, 0.1-1 part of a light stabilizer and 0.5-3 parts of a thixotropic agent. The mildew-proof silane modified polyurethane sealanthas excellent cohesiveness, and is not prone to yellowing; the sealant is prepared by adopting a mildew-proof silane modified polyurethane prepolymer, so that the prepared silane modified polyurethanesealant has a stable and lasting mildew-proof effect, is not prone to yellowing, and is suitable for kitchen and bath decoration; and the preparation method of the polyurethane sealant has the advantages of simplicity in operation, convenience in control, low production cost and high product quality, and is used for large-scale production.

Description

technical field [0001] The invention relates to the technical field of sealants, in particular to a mold-proof silane-modified polyurethane sealant and a preparation method thereof. Background technique [0002] Home kitchen and bathroom decoration may involve long-term exposure to water stains, oil stains, and molds. Considering durability and aesthetics, there are high requirements for products that are resistant to water, oil stains, and molds. [0003] At present, there are many types of adhesives for home kitchen and bathroom decoration on the market, and the most widely used ones are two-component epoxy adhesives and silicone sealants. Among them, the two-component epoxy adhesive has good mold resistance and high strength, but has the disadvantages of troublesome construction, easy yellowing, and poor bonding performance, especially the problem of easy yellowing. Difficult to use in gap sealing of sanitary ware. Silicone sealant is cheap, has good elasticity, and has...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J175/04C09J11/04C09J11/06C09J11/08C08G18/66C08G18/48C08G18/32C08G18/42C08G18/12
CPCC08G18/12C08G18/4018C08G18/42C08G18/4825C08G18/4829C08G18/6618C08G18/6685C08K2003/265C08K2003/3045C09J11/04C09J11/06C09J11/08C09J175/04C09J175/08C08L77/00C08K13/02C08K3/26C08K3/34C08K5/12C08K5/544C08K5/5425C08K5/1345C08K3/346C08K3/36C08G18/3893C08G18/3874C08G18/3857C08G18/3855C08K3/30
Inventor 黄淑坚詹锋武安福
Owner GUANGDONG PUSTAR SEALED RAYON CO LTD
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