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Single-ingredient silicone structural sealant and preparation method thereof

A one-component, sealant technology, used in adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve the problems of insufficient bonding strength, limited application, etc., to enhance adhesion and improve cohesion. , The effect of optimizing the cross-linking structure

Active Publication Date: 2017-05-10
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional one-component silicone structural sealants, such as room temperature vulcanized one-component structural sealants prepared with α, ω-dihydroxypolydimethylsiloxane as the main resin, are prepared by using silane coupling agents and titanate coupling agents. It has a good bonding effect on common materials such as glass and aluminum, but its bonding strength is still not strong enough compared with epoxy resin adhesives and polyurethane adhesives, which limits its further application

Method used

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  • Single-ingredient silicone structural sealant and preparation method thereof
  • Single-ingredient silicone structural sealant and preparation method thereof
  • Single-ingredient silicone structural sealant and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1 provides a one-component silicone structural sealant with high bonding strength, which is prepared from the following raw material components in parts by weight: α, ω-dihydroxyl with a viscosity of 50000mPa.s Reaction of 100 parts of polydimethylsiloxane, 100 parts of nano-active calcium carbonate, 4 parts of methyltrimethoxysilane, 1 part of dimethyldimethoxysilane, γ-aminopropyltrimethoxysilane and tartaric acid 2.5 parts, 1.5 parts of acetoacetoxytitanium diisopropoxydiacetate and 0.1 part of dibutyltin dilaurate.

[0029] The preparation method of the above-mentioned one-component silicone structural sealant with high bonding strength is as follows:

[0030] Add corresponding parts by weight of α, ω-dihydroxypolydimethylsiloxane and nano-active calcium carbonate into the kneader, and dehydrate and blend for 30 minutes at 50-150°C with a vacuum of -0.06-0.099MPa. ~300min, the base material is obtained after cooling;

[0031] At room temperature, add the a...

Embodiment 2

[0033] Example 2 provides a one-component silicone structural sealant with high bonding strength, which is prepared from the following raw material components in parts by weight: α, ω-dihydroxyl with a viscosity of 50000mPa.s 100 parts of polydimethylsiloxane, 110 parts of nano-active calcium carbonate, 3 parts of methyltriethoxysilane, 2 parts of dimethyldimethoxysilane, γ-aminopropyltrimethoxysilane and hexadiene 2 parts of acid reactants, 2 parts of acetoacetoxytitanium diisopropoxydiacetate, and 0.5 part of dibutyltin dilaurate.

[0034] The preparation method of the above-mentioned one-component silicone structural sealant with high bonding strength is as follows:

[0035]Add corresponding parts by weight of α, ω-dihydroxypolydimethylsiloxane and nano-active calcium carbonate into the kneader, and dehydrate and blend for 30 minutes at 50-150°C with a vacuum of -0.06-0.099MPa. ~300min, the base material is obtained after cooling;

[0036] At room temperature, add the abo...

Embodiment 3

[0038] Example 3 provides a one-component silicone structural sealant with high adhesive strength, which is prepared from the following raw material components in parts by weight: α, ω-dihydroxyl with a viscosity of 80000mPa.s 100 parts of polydimethylsiloxane, 70 parts of nano-active calcium carbonate, 5 parts of hydrophobic fumed silica, 5 parts of methyltrimethoxysilane, 2 parts of dimethyldimethoxysilane, epoxy cyclohexyl 3 parts of reactant of trimethoxysilane and hexamethylenediamine, 1 part of acetoacetoxy titanium diisopropoxydiacetate, 1 part of acetoacetoxy titanium 1,3-dipropoxydiacetate and two 0.3 parts of butyltin bis(β-diketone ester).

[0039] The preparation method of the above-mentioned one-component silicone structural sealant is as follows:

[0040] Add corresponding parts by weight of α, ω-dihydroxypolydimethylsiloxane, nano-active calcium carbonate, and hydrophobic fumed silica into the kneader. Under MPa, dehydrate and blend for 30-300 minutes, and obt...

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Abstract

The invention relates to a single-ingredient silicone structural sealant and a preparation method thereof. The single-ingredient silicone structural sealant is prepared from 100 parts of poly-alkylsiloxane, 70 to 150 parts of inorganic filling materials, 3 to 10 parts of composite silane cross linking agents, 1 to 5 parts of composite silane coupling agents, 1 to 5 parts of titanium ester catalysts and 0.1 to 0.5 part of organic tin catalysts. The single-ingredient silicone structural sealant uses a mode of adding the composite silane cross linking agents into the composite silane coupling agents on the basis of using the poly-alkylsiloxane as a main body raw material; by using a mode of improving the Van der Waals' force and the hydrogen-bond interaction on the polarity base material by polarity functional groups on longer polarity long chains in the composite silane coupling agents, the bonding force on the substrates can be further enhanced; on the basis, through the existence of the polarity chain sections, the reinforcing effect of the filling materials can be improved, and the cohesion of the structural sealant is improved; meanwhile, the effect of optimizing the cross linking structure can be achieved by the composite silane cross linking agents; therefore the stretch intensity of the structural sealant is improved.

Description

technical field [0001] The invention relates to the field of chemical materials, in particular to a one-component silicone structural sealant and a preparation method thereof. Background technique [0002] Silicone structural sealant is a paste made of polydimethylsiloxane as the main raw material, supplemented with crosslinking agent, filler, coupling agent, and catalyst in a vacuum state. The water reacts and cures to form elastic silicone rubber. The polymer backbone of the silicone structural sealant is mainly composed of Si-O-Si bonds. During the curing process, the crosslinking agent reacts with the base polymer to form a network Si-O-Si skeleton structure. Compared with organic sealants composed of other polymers, such as polyurethane sealants, acrylic sealants or polysulfide sealants, the most notable feature of silicone structural sealants is their excellent high and low temperature resistance and weather resistance. The bond energy of the Si-O-Si bond is very hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/06C09J11/06C09J11/04
CPCC08K3/26C08K5/5419C08K5/5435C08K5/544C08K13/02C08K2003/265C08K2201/011C08K2201/014C09J11/04C09J11/06C09J183/06
Inventor 江锋蒋金博
Owner GUANGZHOU BAIYUN CHEM IND
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