CN105038495A - Nanometer cellulose-loaded super thermal-insulation heat-preserving paint and preparation method thereof - Google Patents

Abstract

The invention provides a nanometer cellulose-loaded super thermal-insulation heat-preserving paint. The paint is prepared from the following raw materials by weight: 34 to 38 parts of ethyl orthosilicate, a proper amount of hydrochloric acid, a proper amount of ammonia water, a proper amount of ethanol, a proper amount of deionized water, 4 to 5 parts of trimethylchlorosilane, 0.2 to 0.4 part of a cross-linking agent TAIC, 1.2 to 1.5 parts of nanometer cellulose, 0.2 to 0.3 part of C12 alcohol ester, 1 to 2 parts of vinyl acetate-acrylic emulsion, 70 to 75 parts of epoxy resin E-12, 9 to 12 parts of 6-hexanediol diglycidyl ether and 6.8 to 7.2 parts of diethylaminopropylamine. According to the invention, due to usage of aerosil microspheres, the paint has super thermal-insulation heat-preserving performance, and a great amount of energy can be saved; through usage of nanometer cellulose, strength and toughness of the aerosil are improved; and because nanometer cellulose has polar groups, the disadvantage of infirm bonding between hydrophobic aerogel and a high-molecular film forming substance is overcome, bonding between the aerosil and the epoxy resin is enhanced, and fastness of a film is improved.

Description

Superthermal insulation thermal insulation coatings of a kind of supporting nanofibres element and preparation method thereof

Technical field

The present invention relates to thermal insulation coatings field, particularly relate to superthermal insulation thermal insulation coatings of a kind of supporting nanofibres element and preparation method thereof.

Background technology

Aerosil has nanoaperture, is a kind of porous solid material, has low density, the constructional feature of high porosity, have superthermal insulation performance.Utilize silica aerosil microballoon and coating membrane-forming materials combine, form the coating with super heat-insulating property.

Current aerosil utilizes sol-gel method mostly, by silicon source hydrolysis preparations such as tetraethoxys, the aerosil obtained the thus very easily moisture absorption, chance water ftractures, nano-pore structure is caused to be destroyed, affect the performance of aerogel, therefore in preparation process, usually will carry out necessary hydrophobically modified to silica dioxide gel, strengthen the hydrophobicity of aerogel.Its main means adopt specific hydrophobic modifier, silicone hydroxyl hydrophilic in silica wet gel is replaced with methyl, the non-polar group that methylene radical etc. are hydrophobic, thus strengthen the hydrophobicity of gelinite, the material being commonly used for hydrophobic modifier has trimethylchlorosilane, dimethyldiethoxysilane, methyl disilazane, methyltrimethoxy silane etc.

Crossing hydrophobic silica aerosil microballoon is a kind of good lagging material, but because its surface is containing a large amount of non-polar groups, the poor compatibility when it mixes with aqueous polymer systems, interface resistance is large, aerogel microball dispersion is simultaneously uneven, very easily reunites, causes the degradation of matrix material, therefore, suitable modification must be carried out to hydrophobic silica aerogel microballoon.

Aerosil airsetting colloid is crisp frangible, intensity is low, the performances such as resistance to compression are strong not, easily lose heat-insulating property, dimension needs the intensity increasing aerosil, and the method increasing aerosil intensity has interpolation skeleton, exactly modification is carried out to it in addition, increase the strength of joint between its molecule, also need other performances improving aerogel, as performances such as resistance to ultraviolets.Utilize aerosil to be combined the coating making high heat preservation performance with high-molecular coating, can mass energy be saved, also need to solve aerogel and high molecular bonding strength, just need to carry out suitable modification to aerogel.

Summary of the invention

The object of the present invention is to provide superthermal insulation thermal insulation coatings of a kind of supporting nanofibres element and preparation method thereof.

Technical scheme of the present invention is as follows:

A kind of superthermal insulation thermal insulation coatings of supporting nanofibres element, it is characterized in that being made up of the raw material of following weight part: tetraethoxy 34-38, hydrochloric acid are appropriate, ammoniacal liquor is appropriate, appropriate amount of ethanol, deionized water are appropriate, trimethylchlorosilane 4-5, linking agent TAIC0.2-0.4, nano-cellulose 1.2-1.5, alcohol ester 12 0.2-0.3, acrylate and vinyl acetate emulsion 1-2, E-12 epoxy resin 70-75,1,6-hexanediol diglycidyl ether 9-12, diethylaminopropylamine 6.8-7.2;

The preparation method of the superthermal insulation thermal insulation coatings of described supporting nanofibres element, is characterized in that comprising the following steps:

(1) linking agent TAIC is added in the ethanol of 4-5 weight part, stir, then add nano-cellulose, stirring reaction 30-40 minute, spraying dry, obtain the nano-cellulose of modification;

(2) by tetraethoxy: ethanol: hydromassage that is than 1:(8-12): (6-12) adds in container successively, under stirring at 350-400 rev/min, add hydrochloric acid alcoholic solution, adjustment pH value is 2-3, stir 10-13 hour, add the nano-cellulose of the modification that (1) step obtains, mix, then add ammoniacal liquor alcoholic solution, adjustment pH value is 7-8.5, continue to stir 1-2 hour, pour mould into, at room temperature seal and leave standstill, form silica dioxide gel, carry out atomization process, obtain silica gel microspheres, particle diameter is at 1-300 μm; Described hydrochloric acid alcoholic solution is hydrochloric acid: ethanol contend ratio=1:49, and ammoniacal liquor alcoholic solution is ammoniacal liquor: ethanol contend ratio=1:49;

(3) ethanol of 30-40 weight part is got, add trimethylchlorosilane, stir, then add in silica gel microspheres, stir, aging two days at normal temperatures, by ethanol and deionized water by volume 1:1 mix, obtain aqueous ethanolic solution, get the aqueous ethanolic solution of 3 times of weight of silica gel microspheres, cleaning gel micro-ball 3 times, puts with ethanol and does solution replacement, at supercritical CO ₂dry under condition, obtain the silica aerosil microballoon of modification;

(4) other remaining components are mixed, stir, then add the improved silica aerogel microball that (3) step obtains, stir, to obtain final product.

Beneficial effect of the present invention

Coating of the present invention employs silica aerosil microballoon, there is superthermal insulation heat-insulating property, mass energy can be saved, by using nano-cellulose, add the intensity of aerogel, toughness, because nano-cellulose has polar group, solve hydrophobic aerogels with macromolecule filming material in conjunction with unstable shortcoming, add the bonding strength with epoxy resin, improve film fastness.

Embodiment

A kind of superthermal insulation thermal insulation coatings of supporting nanofibres element, be made up of the raw material of following weight part (kilogram): tetraethoxy 36, hydrochloric acid are appropriate, ammoniacal liquor is appropriate, appropriate amount of ethanol, deionized water appropriate, trimethylchlorosilane 4.5, linking agent TAIC0.3, nano-cellulose 1.3, alcohol ester 12, acrylate and vinyl acetate emulsion 1.5, E-12 epoxy resin 73,1,6-hexanediol diglycidyl ether 11, diethylaminopropylamine 7;

The preparation method of the superthermal insulation thermal insulation coatings of described supporting nanofibres element, comprises the following steps:

(1) added by linking agent TAIC in the ethanol of 4.5 weight parts, stir, then add nano-cellulose, stirring reaction 35 minutes, spraying dry, obtains the nano-cellulose of modification;

(2) by tetraethoxy: ethanol: hydromassage that adds in container successively than 1:10:10, under stirring at 380 revs/min, add hydrochloric acid alcoholic solution, pH value is regulated to be 3, stir 12 hours, add the nano-cellulose of the modification that (1) step obtains, mix, then add ammoniacal liquor alcoholic solution, pH value is regulated to be 8.5, continue stirring 1 hour, pour mould into, at room temperature seal and leave standstill, form silica dioxide gel, carry out atomization process, obtain silica gel microspheres, particle diameter is at 1-300 μm; Described hydrochloric acid alcoholic solution is hydrochloric acid: ethanol contend ratio=1:49, and ammoniacal liquor alcoholic solution is ammoniacal liquor: ethanol contend ratio=1:49;

(3) ethanol of 35 weight parts is got, add trimethylchlorosilane, stir, then add in silica gel microspheres, stir, aging two days at normal temperatures, by ethanol and deionized water by volume 1:1 mix, obtain aqueous ethanolic solution, get the aqueous ethanolic solution of 3 times of weight of silica gel microspheres, cleaning gel micro-ball 3 times, puts with ethanol and does solution replacement, at supercritical CO ₂dry under condition, obtain the silica aerosil microballoon of modification;

(4) other remaining components are mixed, stir, then add the improved silica aerogel microball that (3) step obtains, stir, to obtain final product.

Experimental data

The applying coating of this embodiment is on steel plate, and thickness is 3mm, and thermal conductivity is 0.028W/mk(25 DEG C of environment after testing), film ablation surplus is 98%, resistance to 80 washings.

Claims (2)

1. the superthermal insulation thermal insulation coatings of a supporting nanofibres element, it is characterized in that being made up of the raw material of following weight part: tetraethoxy 34-38, hydrochloric acid are appropriate, ammoniacal liquor is appropriate, appropriate amount of ethanol, deionized water are appropriate, trimethylchlorosilane 4-5, linking agent TAIC0.2-0.4, nano-cellulose 1.2-1.5, alcohol ester 12 0.2-0.3, acrylate and vinyl acetate emulsion 1-2, E-12 epoxy resin 70-75,1,6-hexanediol diglycidyl ether 9-12, diethylaminopropylamine 6.8-7.2.

2. the preparation method of the superthermal insulation thermal insulation coatings of supporting nanofibres element according to claim 1, is characterized in that comprising the following steps:

(1) linking agent TAIC is added in the ethanol of 4-5 weight part, stir, then add nano-cellulose, stirring reaction 30-40 minute, spraying dry, obtain the nano-cellulose of modification;

(2) by tetraethoxy: ethanol: hydromassage that is than 1:(8-12): (6-12) adds in container successively, under stirring at 350-400 rev/min, add hydrochloric acid alcoholic solution, adjustment pH value is 2-3, stir 10-13 hour, add the nano-cellulose of the modification that (1) step obtains, mix, then add ammoniacal liquor alcoholic solution, adjustment pH value is 7-8.5, continue to stir 1-2 hour, pour mould into, at room temperature seal and leave standstill, form silica dioxide gel, carry out atomization process, obtain silica gel microspheres, particle diameter is at 1-300 μm; Described hydrochloric acid alcoholic solution is hydrochloric acid: ethanol contend ratio=1:49, and ammoniacal liquor alcoholic solution is ammoniacal liquor: ethanol contend ratio=1:49;

(3) ethanol of 30-40 weight part is got, add trimethylchlorosilane, stir, then add in silica gel microspheres, stir, aging two days at normal temperatures, by ethanol and deionized water by volume 1:1 mix, obtain aqueous ethanolic solution, get the aqueous ethanolic solution of 3 times of weight of silica gel microspheres, cleaning gel micro-ball 3 times, puts with ethanol and does solution replacement, at supercritical CO ₂dry under condition, obtain the silica aerosil microballoon of modification;

(4) other remaining components are mixed, stir, then add the improved silica aerogel microball that (3) step obtains, stir, to obtain final product.