阅读说明：本技术 一种用于制备隔热材料的硅凝胶固化剂及其制备方法 (Silica gel curing agent for preparing heat insulation material and preparation method thereof ) 是由 王中元 王翩 于 2019-09-30 设计创作，主要内容包括：本发明属于固化剂领域,具体涉及一种用于制备隔热材料的硅凝胶固化剂及其制备方法,本发明制备的硅凝胶固化剂以硅凝胶骨架材料为基础,添加填充剂和表面活性剂,在凝胶-溶胶过程中起到促进凝胶固化、强化凝胶骨架结构以及表面钝化作用,同时可以有效抑制凝胶过程中的表面张力变化,消除体系反应过程中的气液分散,优化了凝胶制备过程,使凝胶在常压干燥时能保持结构不坍塌,得到的硅凝胶材料的机械性能、保温隔热效果显著提升。(The invention belongs to the field of curing agents, and particularly relates to a silica gel curing agent for preparing a heat insulation material and a preparation method thereof.)

1. The silicone gel curing agent for preparing the heat insulation material is characterized by comprising the following components in parts by weight: 2.5-30 parts of a silicon-based framework material, 0.1-0.2 part of a filler, l-4 parts of an initiator, 12-30 parts of a pH regulator, 1-6 parts of a surfactant and 30-62 parts of a solvent.

2. The silicone gel curing agent for preparing heat insulating materials according to claim 1, which comprises the following components in parts by weight: 20 parts of silicon-based framework material, 0.1 part of filler, 3 parts of initiator, 25 parts of pH regulator, 4 parts of surfactant and 48 parts of solvent.

3. The silica gel curing agent for preparing a heat insulating material according to claim 1 or 2, wherein the silicon-based skeleton material is one or more of methanol silanetriol, butyldimethylsilanol, trimethylsilanol, triethylsilanol, chlorosilane, sodium trimethylsilanol, potassium triethylsilanol, sodium methanol silanetriol, potassium butyldimethylsilanol, siloxane, epoxy silane, silicone resin, and amino silane.

4. The silica gel curing agent for preparing a heat insulating material according to claim 1 or 2, wherein the filler is one or more of hydroxyapatite, hydrated aluminum salt, potassium chloride, sodium chloride, aluminum trichloride, calcium chloride and aqueous titanium dioxide.

5. The silica gel curing agent for preparing a heat insulating material according to claim 1 or 2, wherein the initiator is one or more of potassium persulfate, sodium persulfate, ammonium persulfate, potassium peroxide, sodium peroxide, calcium peroxide, hydrogen peroxide, magnesium peroxide, dicumyl peroxide, di-t-butyl peroxide, dibenzoyl peroxide, lauroyl peroxide, trimethylamine, dimethylaniline, methyl mercaptan, ethanethiol, ethanedithiol, 1-propanethiol, 1, 3-propanedithiol, methyllithium, butyllithium, triethylaluminum, methyl zinc chloride, and dimethyl zinc.

6. The silica gel curing agent for manufacturing a heat insulating material according to claim 1 or 2, wherein the pH regulator is any one of ammonia water, sodium carbonate, sodium bicarbonate, sodium hydroxide, calcium hydroxide, and potassium hydroxide.

7. The silica gel curing agent for preparing a heat insulating material according to claim 1 or 2, wherein the surfactant is any one of tween 60, span 20, sodium dodecyl sulfate and sodium dodecyl sulfate.

8. The silica gel curing agent for preparing a heat insulating material according to claim 1 or 2, wherein the solvent is one or more of water, ethanol, and ethyl ether.

9. A method of preparing the silicone gel curative of any of claims 1-8, comprising the steps of: mixing and dissolving the silicon-based framework material, the filler, the initiator, the pH regulator and the solvent in a reaction kettle, setting the temperature at 250-350 ℃, the pressure at 1.0-2.0Mpa, reacting for 4-5h, adding water for dilution, filtering, standing the filtrate for 24h, adding a corresponding amount of surfactant, stirring and filtering to obtain the silicon-based framework material.

10. Use of a silica gel curing agent according to any one of claims 1 to 9 in the preparation of a heat insulating material.

Technical Field

The invention belongs to the field of curing agents, and particularly relates to a silica gel curing agent for preparing a heat insulation material and a preparation method thereof.

Background

With the development of economy and scientific progress, the requirements of people on the quality of life are higher and higher. In the face of increasingly serious noise pollution and global warming temperature rise, a comfortable working and living environment is very important for people. When facing noise, hot problem, can be through the main means of human intervention solution: certain materials are used for blocking noise and high temperature.

Aiming at the aspect of heat insulation, Chinese patent CN103087605B discloses a water-based nano heat insulation material and a preparation method thereof, wherein the material is prepared from porous water-based nano SiO₂Suspension emulsion, inorganic nano TiO₂Inorganic nano bismuth oxychloride, glass hollow microspheres, inorganic ultramicro material, functional assistant, flame retardant and deionized water, and is compared with the conventional materialCompared with the prior art, the material has excellent heat conductivity coefficient, excellent flame retardance and no toxic and harmful substance emission, and is a novel environment-friendly building heat-insulating material. However, the inorganic main body structure of the material is filled with a space containing gas, and the space is filled with high-porosity porous inorganic nano SiO with large specific surface area₂And other raw materials form an ultramicro air-containing hole negative space, and although the ideal heat insulation and heat storage effects are achieved, the structure is easy to absorb sound and poor in effect.

In view of the aspect of moisture resistance, the chinese patent application CN103436204A discloses a nano-modified water-based weather-resistant adhesive and a preparation method thereof, the adhesive is prepared from acrylate polymer emulsion, organosilicon modified acrylate copolymer emulsion, tackifier emulsion, filler, dispersant, wetting agent, nano-powder water dispersion, bactericide, pH regulator, defoaming agent and thickener, and has the advantages of wide temperature range, good moisture resistance, excellent aging resistance of heat resistance, light resistance, salt resistance, fog resistance and the like, and higher efficiency. However, when the adhesive has a function, the adhesive is generally used between two plates to play a role of a damping layer, certain adhesiveness and weather resistance need to be ensured, the preparation method is complex, and the practicability has certain influence.

In the prior art, the adopted sound insulation materials are gypsum boards, cement fiber boards, metal boards, calcium silicate boards, glass boards, ceramic boards and other materials with high density, while the heat insulation materials are mostly fluffy materials with good flexibility, such as mineral wool, rock wool, glass wool, polyphenyl, EPS, XPS, PU hard bubbles and the like, and have obvious difference. Therefore, it is desirable to provide a silicone gel material that can combine a plurality of different materials to provide thermal and acoustic insulation. Therefore, the silica gel curing agent is provided, the curing of silica gel can be accelerated, the gel skeleton structure and the surface passivation effect can be strengthened, the surface tension change in the gel process can be effectively inhibited, the gas-liquid dispersion in the system reaction process is eliminated, the surface tension is reduced, the normal-pressure drying is favorably realized, the mechanical property of the prepared silica gel is more excellent, and the heat preservation and insulation effect is obviously improved.

Disclosure of Invention

Aiming at the defects of a silica gel product in the prior art, the invention aims to provide the silica gel curing agent, which can accelerate the curing process, improve the gel preparation efficiency, strengthen the gel skeleton structure and passivate the gel surface, effectively reduce the surface tension of wet gel, and is beneficial to drying under normal pressure and improving the performance of the silica gel product.

In order to achieve the purpose, the invention adopts the following technical scheme:

a silica gel curing agent for preparing a heat insulation material comprises the following components in parts by weight: 2.5-30 parts of a silicon-based framework material, 0.1-0.2 part of a filler, l-4 parts of an initiator, 12-30 parts of a pH regulator, 1-6 parts of a surfactant and 30-62 parts of a solvent.

Further, the silicone gel curing agent for preparing the heat insulation material comprises the following components in parts by weight: 20 parts of silicon-based framework material, 0.1 part of filler, 3 parts of initiator, 25 parts of pH regulator, 4 parts of surfactant and 48 parts of solvent.

Further, the silicon-based framework material is one or more of methanol silanetriol, butyl dimethyl silanol, trimethyl silanol, triethyl silanol, chlorosilane, sodium trimethyl silanol, potassium triethyl silanol, methanol silanetriol sodium, butyl dimethyl silanol potassium, siloxane, epoxy silane, silicon resin and amino silane.

Further, the filler is one or more of hydroxyapatite, hydrated aluminum salt, potassium chloride, sodium chloride, aluminum trichloride, calcium chloride and water-based titanium dioxide.

Further, the initiator is one or more of potassium persulfate, sodium persulfate, ammonium persulfate, potassium peroxide, sodium peroxide, calcium peroxide, hydrogen peroxide, magnesium peroxide, dicumyl peroxide, di-tert-butyl peroxide, dibenzoyl peroxide, lauroyl peroxide, trimethylamine, dimethylaniline, methyl mercaptan, ethyl mercaptan, ethanedithiol, 1-propyl mercaptan, 1, 3-propanedithiol, methyllithium, butyllithium, triethylaluminum, methyl zinc chloride and dimethyl zinc.

Further, the pH regulator is any one of ammonia water, sodium carbonate, sodium bicarbonate, sodium hydroxide, calcium hydroxide and potassium hydroxide.

Further, the surfactant is any one of tween 60, span 20, sodium dodecyl sulfate and sodium dodecyl sulfate.

Further, the solvent is one or more of water, ethanol and diethyl ether.

Further, the preparation method of the silicone gel curing agent comprises the following steps:

mixing and dissolving the silicon-based framework material, the filler, the initiator, the pH regulator and the solvent in a reaction kettle, setting the temperature at 250-350 ℃, the pressure at 1.0-2.0Mpa, reacting for 4-5h, adding water for dilution, filtering, standing the filtrate for 24h, adding a corresponding amount of surfactant, stirring and filtering to obtain the silicon-based framework material.

In addition, the invention also provides application of the silica gel curing agent in preparation of a heat and sound insulation material.

Furthermore, the addition amount of the silica gel curing agent in the preparation of the nano heat-insulating material is 2-30%.

In the invention, the silica gel curing agent can combine various different raw materials to prepare a combined material, and the silica-based framework material adopted by the invention mainly has the function of enhancing the mechanical property and the heat resistance of the silica gel. However, it has been found that the silicon-based backbone material contained in the curing agent is susceptible to temperature effects, causing expansion or contraction, which affects the properties of the material. The applicant has surprisingly found in practice that the addition of a certain amount of filler can reduce the influence of temperature on the performance of the material, and can increase the storage stability of the finished curing agent, and in addition, the addition of the surfactant is beneficial to increasing the uniformity of the solution in the preparation process of the curing agent and enabling the curing agent to have the effect of reducing the surface tension of gel, thereby being beneficial to the normal-pressure drying of the gel. In the sol-gel process of the silica gel preparation, the curing agent of the invention is added, which can not only promote the curing efficiency, but also improve the mechanical property and the heat insulation effect of the silica gel product. The addition of the initiator can better promote the synthesis of the curing agent, reduce the reaction potential energy and promote the rapid completion of the preparation.

The materials prepared in examples 1-3 of the present invention all had thermal conductivity coefficients<0.02W·m^-1·K^-1The specific surface areas are all 850m²More than g, is a high-efficiency heat insulation material; in contrast, the materials prepared in comparative examples 1 to 3 (in which the surfactant, the initiator and the filler were removed, respectively) had significantly increased thermal conductivity and deteriorated thermal insulation effects, compared to example 1.

The invention has the following advantages:

(1) the silica gel curing agent provided by the invention is based on a silica gel framework material, the filler and the surfactant are added, the raw materials are combined and cooperated with each other, when the silica gel heat-insulating material is prepared, the silica gel curing can be promoted, the gel framework structure is strengthened, the surface of the gel is passivated, meanwhile, the surface tension of wet gel is effectively reduced, the gas-liquid dispersion in the system reaction process is eliminated, the gel can keep the structure from collapsing when being dried under normal pressure, and the mechanical property and the heat-insulating effect of the obtained silica gel material are obviously improved.

(2) The silicone gel curing agent provided by the invention can accelerate the curing process of silicone gel, improve the preparation efficiency of the gel and optimize the preparation process of the gel when the silicone gel heat-insulating material is prepared.

(3) The silica gel curing agent is prepared from environment-friendly and non-toxic materials, the raw materials are wide in source, the cost is low, the preparation method is simple, and the prepared heat insulation material can be applied to the fields of buildings, equipment and the like.

Detailed Description

The present invention will be described in further detail with reference to the following examples. It should not be understood that the scope of the above-described subject matter of the present invention is limited to the following examples.

Wherein, the reagents used in the invention are all common reagents and can be purchased from common reagent production and sale companies.