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Food-grade self-leveling temperature-resisting sealant and preparation method thereof

A self-leveling and sealant technology, applied in chemical instruments and methods, adhesives, and other chemical processes, etc., can solve problems such as water resistance, adhesiveness not mentioned, easy aging, yellowing, and production of harmful substances, etc. Improve waterproof sealing and bonding strength, improve self-leveling, good chemical stability

Inactive Publication Date: 2019-02-05
广东长鹿新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicone sealants are safe and environmentally friendly, with good biocompatibility, and are the first choice for the food industry. Now most of the silicone sealants on the market are calcium powder system thixotropic adhesives, which are non-fluid paste solids. It is more likely that there are gaps and air bubbles between the colloid and the base material, and the impurity composition of the calcium powder filler is complex, and the content of heavy metals cannot be controlled. The calcium powder treated with fatty acids has unstable high temperature resistance, is easy to age, yellow, and produces harmful materials
Chinese Patent Document No. CN106190012A discloses "a transparent high-strength self-leveling demethanol type one-component organic silica gel" that uses organotin as a catalyst, which is harmful to the human body; Chinese Patent Document No. CN104017535B discloses "transparent ketoxime glue" The prepared glue does not have self-leveling property, and uses organotin as a catalyst, so it is not suitable for the field of food utensil production; "Acid-type RTV sealant" uses a mixture of titanate, white carbon black, and metal oxides as a catalyst to produce an acid glue that is stable in storage, and its water resistance and adhesion are not mentioned.

Method used

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  • Food-grade self-leveling temperature-resisting sealant and preparation method thereof
  • Food-grade self-leveling temperature-resisting sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0023] The viscosity of α, ω-dihydroxy polydimethylsiloxane at room temperature is 25°C is 20000mPa·s, and the dosage is 100 parts;

[0024] The plasticizer is dimethyl polysiloxane, and the consumption is 5 parts;

[0025] The filler is hydrophilic fumed silica, and the dosage is 4 parts;

[0026] The crosslinking agent is methyltrimethoxysilane, and the dosage is 6 parts;

[0027] The adhesion promoter is a mixture A of 0.3 parts of 3-aminopropyltriethoxysilane mixed with 0.6 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane;

[0028] The catalyst is tert-butyl titanate, and the dosage is 2 parts.

[0029] The preparation steps are as follows:

[0030] (1) α, ω-dihydroxy polydimethylsiloxane, dimethylpolysiloxane and hydrophilic fumed silica were stirred in a double planetary mixer for 120 minutes, the rotating speed was 30 rpm, and the temperature was 110℃, vacuum -0.8Mpa;

[0031] (2) Lower the temperature to 20-55°C, add methyltrimethoxysilane, mixture A and tert-b...

no. 2 example

[0034] The amount of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 20000mPa·s is 80 parts, and the amount of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 5000mPa·s is 20 parts;

[0035] The filler is hydrophobic fumed silica, and the dosage is 4 parts;

[0036] The crosslinking agent is methyltriacetoxysilane, and the dosage is 9 parts;

[0037] The adhesion promoter is γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and the dosage is 0.3 parts;

[0038] The catalyst is tert-butyl titanate, and the dosage is 0.3 parts.

[0039] The preparation steps are as follows:

[0040] (1) α, ω-dihydroxy polydimethylsiloxane and hydrophobic fumed silica were stirred for 120 minutes in a double planetary mixer at a speed of 30 rpm, a temperature of 115°C, and a vacuum of -0.8Mpa;

[0041] (2) Lower the temperature to 20-55°C, add methyltriacetoxysilane and tert-butyl titanate into a planetary mixer, stir for 30 minutes at a speed of 40 rpm, control the temperature at 40...

no. 3 example

[0044] The viscosity of α, ω-dihydroxy polydimethylsiloxane at room temperature is 25°C is 80000mPa·s, and the dosage is 80 parts;

[0045] The plasticizer is dimethyl polysiloxane, and the consumption is 20 parts;

[0046] The filler is hydrophilic fumed silica, and the dosage is 4 parts;

[0047] The cross-linking agent is a mixture B of 5 parts of vinyl tributylketoxime silane mixed with 4 parts of methyl tributylketone oxime silane;

[0048] The adhesion promoter is a mixture C of 0.3 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane and 0.6 parts of 3-aminopropyltriethoxysilane;

[0049] The catalyst is tert-butyl titanate, and the dosage is 1.5 parts.

[0050] The preparation steps are as follows:

[0051] (1) α, ω-dihydroxy polydimethylsiloxane, dimethylpolysiloxane and hydrophilic fumed silica were stirred in a double planetary mixer for 120 minutes, the rotating speed was 30 rpm, and the temperature was 110℃, vacuum -0.8Mpa;

[0052] (2) Lower the temperature t...

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Abstract

The invention provides a food-grade self-leveling temperature-resisting sealant and a preparation method thereof. The food-grade self-leveling temperature-resisting sealant is prepared from the following raw materials in parts by weight: 100 parts of alpha,omega-dihydroxyl polydimethylsiloxane, 0 to 10 parts of a plasticizer, 1 to 5 parts of filler, 2 to 10 parts of a crosslinking agent, 0.01 to 1part of an adhesion promoter and 0.01 to 2 parts of a catalyst. The food-grade self-leveling temperature-resisting sealant has the beneficial effects that medium and low viscosity polysiloxane is used as a polymer and white carbon black is used as the filler; the filler is added into a system before the crosslinking agent is added; hydroxyl is removed through a dehydration technology so that theself-leveling property of gel can be effectively improved and a gap between base materials can be automatically filled, and furthermore, bubbles are prevented from being remained and the waterproof sealing performance and the bonding strength are improved; the white carbon black is used as the filler so that the sealant has the advantages of high purity, good chemical stability, temperature resistance, yellowing resistance and no heavy metal; titanate is used as the catalyst; after the sealant is completely cured, substances toxic and harmful to human bodies are not remained and food requirements can be met.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a food-grade self-leveling heat-resistant sealant and a preparation method thereof. Background technique [0002] Food-grade self-leveling heat-resistant sealant is a kind of industrial glue with good flexibility, self-leveling effect, water resistance, yellowing resistance, high and low temperature resistance, mainly used for sealing and waterproofing between rigid materials, such as glass electric kettle glass The sealing and bonding of the pot body and the stainless steel base can realize the flexible connection between rigid materials, and can effectively buffer the stress changes caused by thermal expansion of glass and stainless steel. Silicone sealants are safe and environmentally friendly, with good biocompatibility, and are the first choice for the food industry. Now most of the silicone sealants on the market are calcium powder system thixotropic adhesives, which are ...

Claims

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Application Information

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IPC IPC(8): C09J183/04C09J11/08C09J11/04C09J11/06C09K3/10
CPCC08L2201/08C08L2205/025C09J11/04C09J11/06C09J11/08C09J183/04C09K3/10C08L83/04C08K3/36C08K5/5419C08K5/544C08K13/02C08K5/5435
Inventor 张剑马营陈家荣刘堂应何晓军梁真福
Owner 广东长鹿新材料科技有限公司
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