阅读说明：本技术 一种隔热阻燃片及其制备方法 (Heat-insulating flame-retardant sheet and preparation method thereof ) 是由 张继承 张蔓蔓 刘喜宗 张东生 姚栋嘉 何凤霞 董会娜 于 2020-07-07 设计创作，主要内容包括：本发明属于隔热阻燃技术领域,公开一种隔热阻燃片及其制备方法。包括基材层、阻燃涂层,阻燃涂层喷涂在基材层的四周；其中,所述基材层为气凝胶毡,所述阻燃涂层由水性弹性涂料、水性树脂、阻燃剂、分散剂、偶联剂、二氧化硅粉组成。制备步骤：按照阻燃涂层的组成,取各原料,搅拌均匀,得阻燃涂料；将气凝胶毡表面吹扫干净,得毡体A；将阻燃涂料喷涂在毡体A的四周,干燥,得隔热阻燃片。本发明在气凝胶毡外侧喷涂阻燃涂层既能防止气凝胶毡表面掉粉,又能增加气凝胶毡的阻燃性能,且不影响气凝胶毡的柔韧性。(The invention belongs to the technical field of heat insulation and flame retardance, and discloses a heat insulation and flame retardance sheet and a preparation method thereof. The flame-retardant coating is sprayed on the periphery of the substrate layer; the base material layer is aerogel felt, and the flame-retardant coating is composed of a water-based elastic coating, water-based resin, a flame retardant, a dispersing agent, a coupling agent and silicon dioxide powder. The preparation method comprises the following steps: according to the composition of the flame-retardant coating, taking the raw materials, and uniformly stirring to obtain the flame-retardant coating; sweeping the surface of the aerogel felt to obtain a felt body A; and spraying the flame-retardant coating around the felt body A, and drying to obtain the heat-insulating flame-retardant sheet. The flame-retardant coating is sprayed on the outer side of the aerogel felt, so that the surface of the aerogel felt can be prevented from powder falling, the flame retardant property of the aerogel felt can be improved, and the flexibility of the aerogel felt is not influenced.)

1. A heat-insulating flame-retardant sheet characterized in that: the heat-insulating flame-retardant sheet comprises a base material layer and a flame-retardant coating, and the flame-retardant coating is sprayed on the periphery of the base material layer; wherein the base material layer is aerogel felt, and the flame-retardant coating layer is composed of aqueous elastic coating, aqueous resin, flame retardant, dispersant, coupling agent and silicon dioxide powder according to the mass ratio of (30-60) to (10-40) to (10-25) to (1-5).

2. The heat insulating and flame retardant sheet of claim 1, wherein: the heat-insulating flame-retardant sheet further comprises a protective layer, wherein the protective layer is sprayed on the periphery of the flame-retardant coating, and the protective layer is made of water-based elastic coating.

3. The heat-insulating flame-retardant sheet according to claim 1 or 2, wherein: the water-based elastic coating in the flame-retardant coating is one of water-based ethylene-vinyl acetate elastic coating, water-based organic silicon-acrylic elastic coating, water-based acrylic elastic coating and water-based rubber emulsion.

4. The heat insulating and flame retardant sheet of claim 2, wherein: the water-based elastic coating in the protective layer is one of water-based ethylene-vinyl acetate elastic coating, water-based organic silicon acrylic elastic coating, water-based acrylic elastic coating and water-based rubber emulsion.

5. The heat-insulating flame-retardant sheet according to claim 1 or 2, wherein: the water-based resin is one of water-based epoxy resin, water-based polyurea resin, water-based phenolic resin and water-based polyurethane resin.

6. The heat-insulating flame-retardant sheet according to claim 1 or 2, wherein: the aerogel felt is one of silicon dioxide aerogel felt, aluminum oxide aerogel felt, titanium dioxide aerogel felt and zirconium dioxide aerogel felt; the flame retardant is one or more of phosphorus-nitrogen flame retardant, inorganic flame retardant, DOPO, decabromodiphenyl ether and decabromodiphenyl ethane; the dispersing agent is one of BYK-161, BYK-163 and BYK-2000; the coupling agent is one of silane coupling agent, titanate coupling agent, aluminate coupling agent and borate coupling agent.

7. A method for preparing the heat-insulating flame-retardant sheet according to claim 1, which comprises the steps of:

(1) according to the composition of the flame-retardant coating, the water-based elastic coating and the water-based resin are stirred uniformly, then the flame retardant, the dispersing agent, the coupling agent and the silicon dioxide powder are sequentially added, and the stirring is continued until the mixture is uniform, so that the flame-retardant coating is obtained;

(2) purging the surface of the aerogel felt to be clean, and removing floating powder on the surface to obtain a felt body A;

(3) spraying the flame-retardant coating obtained in the step (1) on the periphery of the felt body A obtained in the step (2);

(4) and (4) drying the felt obtained in the step (3) to obtain the heat-insulating flame-retardant sheet.

8. The method for preparing a heat-insulating flame-retardant sheet according to claim 7, wherein the step (4) is: drying the felt body obtained in the step (3) to obtain a felt body B; spraying a layer of water-based elastic coating around the felt body B to obtain a felt body C; and drying the felt body C to obtain the heat-insulating flame-retardant sheet.

9. The method for preparing the heat-insulating flame-retardant sheet as claimed in claim 7 or 8, wherein in the step (1), the stirring speed is 450-.

10. The method for preparing a heat-insulating flame-retardant sheet according to claim 7 or 8, wherein: in the step (4), the temperature for drying the two parts is 50-80 ℃, and the drying time is 5-20 min.

Technical Field

The invention belongs to the technical field of heat insulation and flame retardance, and particularly relates to a heat insulation and flame retardance sheet and a preparation method thereof.

Background

The new energy automobile refers to all other energy automobiles except gasoline and diesel engines. Including fuel cell vehicles, hybrid vehicles, hydrogen-powered vehicles, solar vehicles, and the like, have a relatively low exhaust emission.

As the new energy automobile meets the environmental protection requirement vigorously advocated by the nation, the sales volume of the new energy automobile is increased year by year, the application range is larger and larger, the new energy automobiles sold in the current Chinese market are mostly hybrid electric vehicles and pure electric vehicles, and the power supply of the new energy automobiles mainly comprises lithium ion batteries, nickel-hydrogen batteries, fuel batteries, lead-acid batteries and super capacitors. Because the power that the automobile traveles needs is very big, the new energy automobile that adopts electric power to provide power need the battery compartment for a long time to provide great electric current in order to guarantee can normally travel, guarantees the provision of power. After the vehicle-mounted battery outputs electric energy for a long time, the battery body can obviously generate heat by long-time chemical reaction in the battery, and the risks of combustion and explosion exist. Traditional battery core module all adopts the plastics baffle to separate the battery each other, and there is not the actual use, and not only weight is big still can't play the guard action like this, and causes the battery high temperature easily and lead to the baffle to dissolve, the scheduling problem catches fire. The existing protective felt is simple in structure and easy to deform, mostly depends on the heat insulation function of the felt body to resist flame, and cannot meet the relevant standards of the national new energy field. Therefore, how to realize the safety problem of the battery pack in the field of new energy automobiles, a convenient and effective heat insulation and heat dissipation solution is the problem of the long-term development and the primary consideration of new energy realization.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a heat-insulating flame-retardant sheet and a preparation method thereof.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the heat-insulating flame-retardant sheet comprises a base material layer and a flame-retardant coating, wherein the flame-retardant coating is sprayed on the periphery of the base material layer; wherein the base material layer is aerogel felt, and the flame-retardant coating layer is composed of aqueous elastic coating, aqueous resin, flame retardant, dispersant, coupling agent and silicon dioxide powder according to the mass ratio of (30-60) to (10-40) to (10-25) to (1-5).

Preferably, on the basis of the technical scheme, the heat-insulating flame-retardant sheet further comprises a protective layer, wherein the protective layer is sprayed on the periphery of the flame-retardant coating, and the protective layer is made of water-based elastic coating.

The thickness of the flame-retardant coating and the protective layer can be adjusted according to different applications, and the thickness of the flame-retardant coating and the protective layer can be 0.01-0.2mm in practice.

Preferably, the aqueous elastic coating in the flame-retardant coating and the protective layer is one of aqueous ethylene-vinyl acetate elastic coating, aqueous organosilicon acrylic elastic coating, aqueous acrylic elastic coating and aqueous rubber emulsion.

Preferably, the aqueous resin is one of an aqueous epoxy resin, an aqueous polyurea resin, an aqueous phenol resin and an aqueous polyurethane resin.

Preferably, the aerogel felt is one of a silica aerogel felt, an alumina aerogel felt, a titania aerogel felt, and a zirconia aerogel felt.

Preferably, the flame retardant is one or more of phosphorus-nitrogen flame retardant, inorganic flame retardant, DOPO, decabromodiphenyl ether and decabromodiphenyl ethane.

Preferably, the inorganic flame retardant is aluminum hydroxide, magnesium hydroxide, ammonium phosphate or zinc borate, and the phosphorus-nitrogen flame retardant is ammonium polyphosphate, isopropylated triphenyl phosphate, melamine pyrophosphate or melamine cyanurate.

Preferably, the dispersant is one of BYK-161, BYK-163 and BYK-2000.

Preferably, the coupling agent is one of a silane coupling agent, a titanate coupling agent, an aluminate coupling agent and a borate coupling agent.

A preparation method of the heat-insulating flame-retardant sheet comprises the following steps:

(1) according to the composition of the flame-retardant coating, the water-based elastic coating and the water-based resin are stirred uniformly, then the flame retardant, the dispersing agent, the coupling agent and the silicon dioxide powder are sequentially added, and the stirring is continued until the mixture is uniform, so that the flame-retardant coating is obtained;

(2) Purging the surface of the aerogel felt to be clean, and removing floating powder on the surface to obtain a felt body A;

(3) spraying the flame-retardant coating obtained in the step (1) on the periphery of the felt body A obtained in the step (2);

(4) and (4) drying the felt obtained in the step (3) to obtain the heat-insulating flame-retardant sheet.

Preferably, on the basis of the technical scheme, the heat-insulating flame-retardant sheet further comprises a protective layer, and correspondingly, the preparation step (4) is as follows: drying the felt body obtained in the step (3) to obtain a felt body B; spraying a layer of water-based elastic coating around the felt body B to obtain a felt body C; and drying the felt body C to obtain the heat-insulating flame-retardant sheet.

Preferably, in the step (1), the stirring speed is 450-600 r/min.

Preferably, in the step (4), the two drying parts are dried at the temperature of 50-80 ℃ for 5-20 min.

Has the advantages that:

(1) the thermal insulation flame-retardant sheet prepared by the invention adopts the aerogel felt as the base material layer, has the characteristics of light weight and low heat conductivity coefficient, and the flame-retardant coating sprayed on the outer side of the aerogel felt can prevent the surface of the aerogel felt from dropping powder, increase the flame retardant property of the aerogel felt and not influence the flexibility of the aerogel felt; the viscosity of the coating can be adjusted by adding the silicon dioxide powder into the flame-retardant coating, so that the coating is convenient to coat, and the hardness and the adhesive force of the flame-retardant coating can be adjusted by adding the water-based resin;

(2) The flame retardant coating disclosed by the invention has the flame retardant grade reaching V0, is self-extinguished after being away from fire, is applied to the field of new energy automobile batteries, and can delay the ignition time of an automobile and enhance the time for escaping; after the flame-retardant coating is sprayed and dried on the substrate layer, the condition of no cracking is found after repeated folding, and the long-time use can be ensured;

(3) according to the invention, a layer of water-based elastic coating is coated outside the flame-retardant coating so as to form a protective layer outside the flame-retardant coating, so that the flame-retardant coating is protected and is not easy to fall off;

(4) the heat-insulating flame-retardant sheet prepared by the invention can be applied to new energy automobiles in a large scale, and the excellent heat-insulating property of the heat-insulating flame-retardant sheet has great reference significance for the application of the heat-insulating flame-retardant sheet in the heat-insulating fields of buildings, industry, civil use and the like.

Detailed Description

The present invention will be further described with reference to the following specific examples. It should be understood that the following examples are illustrative only and are not intended to limit the scope of the present invention.

Examples without protective layer