阅读说明：本技术 一种新能源汽车电池盖板耐老化涂料及涂覆方法 (A kind of new energy car battery cover board aging resistant coating and coating method ) 是由 钱海明 于 2019-09-06 设计创作，主要内容包括：本发明公开了一种新能源汽车电池盖板耐老化涂料,由如下重量份的原料制成：改性丙烯酸乳液50-60份、固化剂6-8份、润湿剂0.5-0.7份、消泡剂0.6-0.8份、功能填料2-3份、N,N-二甲基乙醇胺0.04-0.06份、季戊四醇三丙烯酸酯5-7份、去离子水2-3份；本发明还公开了该涂料的涂覆方法。本发明采用改性丙烯酸乳液为基体物质,其主链中含有较多羟基和不饱和双键,羟基能够与固化剂在常温下发生交联固化反应,形成三维网络结构,不饱和双键能够与季戊四醇三丙烯酸酯上的双键发生交联反应,进一步提高涂膜的致密性；功能填料不仅能够均匀分散于涂料中,赋予涂膜良好的耐热性能和耐老化性能,而且能与基体物质相互作用,提高涂膜的致密性。(The invention discloses a kind of new energy car battery cover board aging resistant coatings, it is made of the raw material of following parts by weight: 50-60 parts of modified acrylic acid emulsion, 6-8 parts of curing agent, 0.5-0.7 parts of wetting agent, 0.6-0.8 parts of defoaming agent, 2-3 parts of functional stuffing, N, 0.04-0.06 parts of N- dimethylethanolamine, 5-7 parts of pentaerythritol triacrylate, 2-3 parts of deionized water；The invention also discloses the coating methods of the coating.The present invention uses modified acrylic acid emulsion for base matter, containing compared with polyhydroxy and unsaturated double-bond in its main chain, hydroxyl can crosslink at normal temperature curing reaction with curing agent, form three-dimensional net structure, unsaturated double-bond can be crosslinked with the double bond on pentaerythritol triacrylate to react, and further increases the compactness of film；Functional stuffing can not only be dispersed in coating, assigned the good heat resistance of film and ageing-resistant performance, and can interact with base matter, improved the compactness of film.)

1. a kind of new energy car battery cover board aging resistant coating, which is characterized in that be made of the raw material of following parts by weight: modified 50-60 parts of acrylic emulsion, 6-8 parts of curing agent, 0.5-0.7 parts of wetting agent, 0.6-0.8 parts of defoaming agent, 2-3 parts of functional stuffing, 0.04-0.06 parts of N, N- dimethylethanolamine, 5-7 parts of pentaerythritol triacrylate, 2-3 parts of deionized water；

The modified acrylic acid emulsion is prepared by the following method:

(1) it weighs ammonium persulfate and is sufficiently dissolved with deionized water, be configured to the initiator solution that mass fraction is 5%；

(2) by hydroxyethyl methacrylate, styrene, allyl acrylate, methyl methacrylate, acrylic acid, deionized water It is added in beaker with disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate, magnetic agitation carries out pre-emulsification 30min, obtains pre-emulsification monomer；

(3) aqueous solution of sodium bicarbonate is added in four-hole boiling flask, is warming up to 80 DEG C, takes the pre- cream of 1/3 initiator solution and 10% Change monomer to be added at one time in flask, obtains seed emulsion；

(4) remaining pre-emulsification monomer and initiator solution control are at the uniform velocity added drop-wise in seed emulsion in 3h, to remaining pre- After emulsified monomer and initiator solution are added dropwise, 80 DEG C of insulation reaction 30min are cooled to room temperature, ammonium hydroxide tune after the reaction was completed PH value is saved to 7-8, filtering and discharging obtains modified acrylic acid emulsion.

2. a kind of new energy car battery cover board aging resistant coating according to claim 1, which is characterized in that the modification Hydroxyethyl methacrylate, styrene, allyl acrylate, methyl methacrylate, third in acrylic emulsion preparation step (2) The molar ratio of olefin(e) acid is 1:1:1:1:1；Deionized water, the additional amount of disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate are respectively the total matter of monomer 2.5 times, 0.1 times of amount.

3. a kind of new energy car battery cover board aging resistant coating according to claim 1, which is characterized in that the modification The mass fraction of sodium bicarbonate aqueous solution is 15% in acrylic emulsion preparation step (3), and the amount of addition is initiator solution volume 10%.

4. a kind of new energy car battery cover board aging resistant coating according to claim 1, which is characterized in that the function Filler is prepared by the following method:

1) taking 360mL mass fraction is 75% ethanol water, and 18-20mg is added thereto in the case where 150r/min is at the uniform velocity stirred Graphene oxide powder, ultrasonic 60-70min, the pH value for adjusting mixed liquor with ammonium hydroxide instill the positive silicon of 1.2mL to 8.5-9.0 dropwise Acetoacetic ester continues ultrasound 60-70min；

2) above-mentioned system room temperature for 24 hours after, be centrifuged under 8000r/min, washes of absolute alcohol solid product 5-6 times, finally Vacuum freeze drying for 24 hours, obtains hydridization filler；

3) 10g hydridization filler is weighed in four-hole boiling flask, and the N-Methyl pyrrolidone dissolution of 200mL, ultrasonic disperse 30- is added 40min, in N₂The gamma-aminopropyl-triethoxy-silane of 4-5mL is slowly added dropwise under atmosphere into reaction system, the magnetic force at 75 DEG C Stirring is for 24 hours；

4) end of reaction, centrifuge separation are distinguished washed product 3-4 times with ethyl alcohol and deionized water, finally in 40 DEG C of vacuum drying ovens For 24 hours, ground 80 mesh obtains functional stuffing for middle drying.

5. a kind of coating method of new energy car battery cover board aging resistant coating, which comprises the steps of:

The first step, after battery cover board is first cleaned drying with distilled water, then supersound washing 30-40min in ethanol is put into 80 DEG C It is dried in baking oven；

Deionized water and wetting agent is added in second step in a reservoir, and functional stuffing is added, adds the defoaming agent of half, disperses Machine disperses 15-20min, and modified acrylic acid emulsion and curing agent is added, is eventually adding N, N- dimethylethanolamine, pentaerythrite three Acrylate and remaining half defoaming agent continue to disperse 30-40min, obtain coating；

Third step, the surface that coating is sprayed to processed battery cover board, wet-film thickness are 35-40 μm, and first room temperature stands 2- 3h, then 80 DEG C of oven drying 105s are placed in, it is finally placed under uv cure machine and irradiates 10s, complete coating.

Technical field

The invention belongs to technical field of coatings, and in particular, to a kind of new energy car battery cover board aging resistant coating and Coating method.

Background technique

Automobile is gone on a journey the indispensable vehicles as people, is usually relied on oil firing driving, can be aggravated the energy and environment Crisis can avoid or reduce oil firing in this regard, automobile industry is proposed New-energy electric vehicle, may advantageously facilitate environmental protection and The short crisis for alleviating traditional energy, has a vast market development prospect.New-energy electric vehicle gradually appears, since it makes With property, cause its frequency of use very high, long operational time, battery power battery cap component therein is as power battery Important component, air-tightness, corrosion resistance and explosion-proof technology aspect also have higher requirement.Battery cap exists for a long time Sealing structure under electrolyte impregnates can guarantee battery no leakage.Therefore the coating quality on battery cover board surface is required also higher.

It is ageing-resistant that the Chinese patent of Patent No. CN201810457476.6 discloses a kind of new energy car battery cover board Coating includes the following raw material according to mass fraction meter: 30-40 parts of polysulfide rubber, 20-28 parts of polytetrafluoroethylene (PTFE) natural gum, terpenes tree 5-8 parts of rouge, 3-6 parts of sebacic dihydrazide, 3-6 parts of high-carbon black pigment, 3-6 parts of zinc borate, 0.2-0.3 parts of ninhydrin, oxidation are sub- 0.2-0.3 parts of tin, 0.5-0.8 parts of diatomite, SRF0.5-0.8 parts of semi-reinforcing furnace black, 0.2-0.3 parts of aluminium nitride, lac 0.5- 0.8 part, it is 0.1-0.2 parts of sulphur, 2-3 parts of S-Ethyl ethylthio sulfonate, 0.1-0.2 parts of chlorinated paraffin, 0.1-0.2 parts of 1,2- methylimidazole, dilute Native cerium fluoride 0.1-0.2 parts.The coating is mixed with more inorganic particulate to improve the performance of coating, still in filming polymer Inorganic particulate can not be scattered in high polymer very well, and then influence the performance of coating, and the coating made is not still able to satisfy It is required that.

Summary of the invention

The purpose of the present invention is to provide a kind of new energy car battery cover board aging resistant coating and coating methods, by adopting It is base matter with modified acrylic acid emulsion, contains in the main chain of modified acrylic acid emulsion compared with polyhydroxy and unsaturated double-bond, In hydroxyl can crosslink at normal temperature curing reaction with the-NCO in curing agent (polyisocyanates), form three dimensional network The cohesive strength of lotion can be improved in network structure, enhances the compactness of film, and unsaturated double-bond can be under ultraviolet light Double bond on pentaerythritol triacrylate crosslinks reaction, further increases the compactness of film；Pass through functional stuffing Functional modification, functional stuffing can not only be dispersed in coating, assign the good heat resistance of film and resistance to ag(e)ing Can, and can interact with base matter, improve the compactness of film；A kind of coating of excellent combination property is obtained, is applicable in In new energy car battery cover board.

The purpose of the present invention can be achieved through the following technical solutions:

A kind of new energy car battery cover board aging resistant coating, is made of the raw material of following parts by weight: modified acrylic acid emulsion 50- 60 parts, 6-8 parts of curing agent, 0.5-0.7 parts of wetting agent, 0.6-0.8 parts of defoaming agent, 2-3 parts of functional stuffing, N, N- dimethyl ethanol 0.04-0.06 parts of amine, 5-7 parts of pentaerythritol triacrylate, 2-3 parts of deionized water；

The modified acrylic acid emulsion is prepared by the following method:

(1) it weighs ammonium persulfate and is sufficiently dissolved with deionized water, be configured to the initiator solution that mass fraction is 5%；

(2) by hydroxyethyl methacrylate, styrene, allyl acrylate, methyl methacrylate, acrylic acid, deionized water It is added in beaker with disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate, magnetic agitation carries out pre-emulsification 30min, obtains pre-emulsification monomer；

(3) aqueous solution of sodium bicarbonate is added in four-hole boiling flask, is warming up to 80 DEG C, takes the pre- cream of 1/3 initiator solution and 10% Change monomer to be added at one time in flask, obtains seed emulsion；

(4) remaining pre-emulsification monomer and initiator solution control are at the uniform velocity added drop-wise in seed emulsion in 3h, to remaining pre- After emulsified monomer and initiator solution are added dropwise, 80 DEG C of insulation reaction 30min are cooled to room temperature, ammonium hydroxide tune after the reaction was completed PH value is saved to 7-8, filtering and discharging obtains modified acrylic acid emulsion.

Further, hydroxyethyl methacrylate, styrene, propylene in the modified acrylic acid emulsion preparation step (2) Allyl propionate, methyl methacrylate, acrylic acid molar ratio be 1:1:1:1:1；Deionized water, two sulphur of dodecyl diphenyl oxide The additional amount of sour sodium is respectively 2.5 times of monomer gross mass, 0.1 times.

Further, the mass fraction of sodium bicarbonate aqueous solution is in the modified acrylic acid emulsion preparation step (3) 15%, the amount of addition is the 10% of initiator solution volume.

Further, the functional stuffing is prepared by the following method:

1) taking 360mL mass fraction is 75% ethanol water, and 18-20mg is added thereto in the case where 150r/min is at the uniform velocity stirred Graphene oxide powder, ultrasonic 60-70min, the pH value for adjusting mixed liquor with ammonium hydroxide instill the positive silicon of 1.2mL to 8.5-9.0 dropwise Acetoacetic ester continues ultrasound 60-70min；

2) above-mentioned system room temperature for 24 hours after, be centrifuged under 8000r/min, washes of absolute alcohol solid product 5-6 times, finally Vacuum freeze drying for 24 hours, obtains hydridization filler；

3) 10g hydridization filler is weighed in four-hole boiling flask, and the N-Methyl pyrrolidone dissolution of 200mL, ultrasonic disperse 30- is added 40min, in N₂The gamma-aminopropyl-triethoxy-silane of 4-5mL is slowly added dropwise under atmosphere into reaction system, the magnetic force at 75 DEG C Stirring is for 24 hours；

4) end of reaction, centrifuge separation are distinguished washed product 3-4 times with ethyl alcohol and deionized water, finally in 40 DEG C of vacuum drying ovens For 24 hours, ground 80 mesh obtains functional stuffing for middle drying.

A kind of coating method of new energy car battery cover board aging resistant coating, includes the following steps:

The first step, after battery cover board is first cleaned drying with distilled water, then supersound washing 30-40min in ethanol is put into 80 DEG C It is dried in baking oven；

Deionized water and wetting agent is added in second step in a reservoir, and functional stuffing is added, adds the defoaming agent of half, disperses Machine disperses 15-20min, and modified acrylic acid emulsion and curing agent is added, is eventually adding N, N- dimethylethanolamine, pentaerythrite three Acrylate and remaining half defoaming agent continue to disperse 30-40min, obtain coating；

Third step, the surface that coating is sprayed to processed battery cover board, wet-film thickness are 35-40 μm, and first room temperature stands 2- 3h, then 80 DEG C of oven drying 105s are placed in, it is finally placed under uv cure machine and irradiates 10s, complete coating.

Beneficial effects of the present invention:

The present invention uses base matter of the modified acrylic acid emulsion as coating, passes through hydroxyethyl methacrylate, styrene, third Olefin(e) acid allyl ester, methyl methacrylate, acrylic acid carry out emulsion polymerization, due to containing in hydroxyethyl methacrylate monomer There is hydroxyl, makes in modified acrylic acid emulsion obtained containing compared with polyhydroxy ,-the NCO of-OH and polyisocyanates can be normal after coating Temperature is lower to occur cross-linking and curing reaction, forms three-dimensional net structure, the cohesive strength of lotion can be improved, enhance the densification of film Property, improve the ageing-resistant of film, mechanical property and waterproofness；Meanwhile containing unsaturated double-bond in allyl acrylate, make winner Contain unsaturated double-bond on chain, under ultraviolet light, on the pentaerythritol triacrylate in double bond and coating on main chain Double bond crosslink reaction, be grafted on pentaerythritol triacrylate successfully in resin chain；Meanwhile three propylene of pentaerythrite Acid esters is three-functionality-degree activated monomer, and under ultraviolet light, system crosslinking points and crosslinking degree increase, and forms interpenetrating networks knot Structure further increases the compactness of film, improves mechanics, the waterproof performance of film；

The present invention joined functional stuffing in coating and carry out functional modification, filler SiO₂It is filled out with the hydridization of graphene oxide Material, the hydroxyl of filler surface and the hydroxyl on gamma-aminopropyl-triethoxy-silane surface react, so that three second of γ-aminopropyl The strand of oxysilane grafts on filler surface, on the one hand, reduces-the OH of filler surface, surface can reduce, dispersion performance It improves；On the other hand, after filler surface surface grafting organosilan, the steric hindrance of filler is added somewhat to, so that The difficulty that filler grain is mutually assembled increases, and increases dispersion performance, functional stuffing is dispersed in coating；It connects Contain-NH on filler after branch₂Functional group ,-NH₂Urea bond (- NHCONH-) can be generated by reacting with-NCO, remove-NH₂Outside, filler table Remaining-the OH in face can still be reacted with-NCO, therefore, can be significantly increased crosslink density, be improved the compactness of film, Jin Erti The mechanical property of high film；Furthermore the hydroxyl of hydridization filler surface can also form hydrogen bond with the carbonyl of polyurethane, generate strong Interaction, so that polyurethane is more careful, to improve the water resistance of film；Nano-meter SiO_2₂Itself be a kind of heat resistance very Good substance, and-Si-O-Si- key has a higher bond energy, and-the NH of the hydroxyl of hydridization filler surface and grafting₂And polyurethane - NCO reaction, more energy are needed when foring relatively stable chemical bond, therefore being thermally decomposed, therefore, film it is resistance to Hot property effectively improves；Lamella graphene oxide in hydridization filler is by its physical barriers effect and to ultraviolet absorption Scattering process can effectively stop ultraviolet light, realize the complete shielding to ultraviolet light, carry out duplicate protection to polyurethane matrix, Improve the ageing-resistant performance of film；

The present invention is base matter by using modified acrylic acid emulsion, is contained in the main chain of modified acrylic acid emulsion compared with polyhydroxy And unsaturated double-bond, hydroxyl therein can crosslink at normal temperature solidification with the-NCO in curing agent (polyisocyanates) Reaction forms three-dimensional net structure, the cohesive strength of lotion can be improved, enhance the compactness of film, unsaturated double-bond is in purple Lower can crosslink with the double bond on pentaerythritol triacrylate of outer light irradiation is reacted, and the densification of film is further increased Property；By the functional modification of functional stuffing, functional stuffing can not only be dispersed in coating, and it is good resistance to assign film Hot property and ageing-resistant performance, and can interact with base matter, improve the compactness of film；Obtain a kind of comprehensive performance Excellent coating is suitable for new energy car battery cover board.

Specific embodiment

Technical solution of the present invention is clearly and completely described below in conjunction with embodiment, it is clear that described reality Applying example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is general Logical technical staff all other embodiment obtained without creative efforts belongs to what the present invention protected Range.

A kind of new energy car battery cover board aging resistant coating, is made of the raw material of following parts by weight: modified propylene yogurt 50-60 parts of liquid, 6-8 parts of curing agent, 0.5-0.7 parts of wetting agent, 0.6-0.8 parts of defoaming agent, 2-3 parts of functional stuffing, N, N- diformazan 0.04-0.06 parts of ethylethanolamine, 5-7 parts of pentaerythritol triacrylate, 2-3 parts of deionized water；

The curing agent is Bayhydur XP2547 type curing agent；

The functional stuffing is prepared by the following method:

1) taking 360mL mass fraction is 75% ethanol water, and 18-20mg is added thereto in the case where 150r/min is at the uniform velocity stirred Graphene oxide powder, ultrasonic 60-70min, the pH value for adjusting mixed liquor with ammonium hydroxide instill the positive silicon of 1.2mL to 8.5-9.0 dropwise Acetoacetic ester (TEOS) continues ultrasound 60-70min；

2) above-mentioned system room temperature for 24 hours after, be centrifuged under 8000r/min, washes of absolute alcohol solid product 5-6 times, finally Vacuum freeze drying for 24 hours, obtains hydridization filler；(after TEOS in-situ hydrolysis, SiO₂Particle, which is uniformly dispersed, is attached to oxidation Between graphene sheet layer, due to SiO₂Interval action weakens the effect of the π-π between lamella, and the SiO formed₂Graphite oxide Alkene-SiO₂" sandwich structure " can effectively prevent the secondary overlapping of graphene oxide layer；It is reacted by the in-situ hydrolysis of TEOS Afterwards, C=O of surface of graphene oxide is converted to Si-O-C structure, SiO₂Nanoparticle is successfully crosslinked in surface of graphene oxide, So that hydridization filler has unique three-dimensional structure, and there is very strong hydrophily, has both SiO₂With the characteristic of graphene oxide)

3) 10g hydridization filler is weighed in four-hole boiling flask, and the N-Methyl pyrrolidone dissolution of 200mL, ultrasonic disperse 30- is added 40min, in N₂The gamma-aminopropyl-triethoxy-silane of 4-5mL is slowly added dropwise under atmosphere into reaction system, the magnetic force at 75 DEG C Stirring is for 24 hours；

4) end of reaction, centrifuge separation are distinguished washed product 3-4 times with ethyl alcohol and deionized water, finally in 40 DEG C of vacuum drying ovens For 24 hours, ground 80 mesh obtains functional stuffing for middle drying；

The hydroxyl of filler surface and the hydroxyl on gamma-aminopropyl-triethoxy-silane surface react, so that three second of γ-aminopropyl The strand of oxysilane grafts on filler surface, on the one hand, reduces-the OH of filler surface, surface can reduce, dispersion performance It improves；On the other hand, after filler surface surface grafting organosilan, the steric hindrance of filler is added somewhat to, so that The difficulty that filler grain is mutually assembled increases, and increases dispersion performance, functional stuffing is dispersed in coating；It connects Contain-NH on filler after branch₂Functional group ,-NH₂Urea bond (- NHCONH-) can be generated by reacting with-NCO, remove-NH₂Outside, filler table Remaining-the OH in face can still be reacted with-NCO, therefore, can be significantly increased crosslink density, be improved the compactness of film, Jin Erti The mechanical property of high film；Furthermore the hydroxyl of hydridization filler surface can also form hydrogen bond with the carbonyl of polyurethane, generate strong Interaction, so that polyurethane is more careful, to improve the water resistance of film；Nano-meter SiO_2₂Itself be a kind of heat resistance very Good substance, and-Si-O-Si- key has a higher bond energy, and-the NH of the hydroxyl of hydridization filler surface and grafting₂And polyurethane - NCO reaction, more energy are needed when foring relatively stable chemical bond, therefore being thermally decomposed, therefore, film it is resistance to Hot property effectively improves；Lamella graphene oxide in hydridization filler is by its physical barriers effect and to ultraviolet absorption Scattering process can effectively stop ultraviolet light, realize the complete shielding to ultraviolet light, carry out duplicate protection to polyurethane matrix, Improve the ageing-resistant performance of film；

The modified acrylic acid emulsion is prepared by the following method:

(1) it weighs initiator ammonium persulfate and is sufficiently dissolved with deionized water, obtain the initiator solution that mass fraction is 5%；

(2) by hydroxyethyl methacrylate, styrene, allyl acrylate, methyl methacrylate, acrylic acid, deionized water It is added in beaker with disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate, magnetic agitation carries out pre-emulsification 30min, obtains pre-emulsification monomer；

Hydroxyethyl methacrylate, styrene, allyl acrylate, methyl methacrylate, acrylic acid molar ratio be 1:1: 1:1:1；Deionized water, the additional amount of disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate are respectively 2.5 times of monomer gross mass, 0.1 times；

(3) aqueous solution (pH buffer) of sodium bicarbonate is added in four-hole boiling flask, is warming up to 80 DEG C, takes 1/3 initiator molten Liquid and 10% pre-emulsification monomer are added at one time in flask, obtain seed emulsion；

The mass fraction of sodium bicarbonate aqueous solution is 15%, and the amount of addition is the 10% of initiator solution volume；

(4) remaining pre-emulsification monomer and initiator solution control are at the uniform velocity added drop-wise in seed emulsion in 3h, to remaining pre- After emulsified monomer and initiator solution are added dropwise, 80 DEG C of insulation reaction 30min are cooled to room temperature, ammonium hydroxide tune after the reaction was completed PH value is saved to 7-8, filtering and discharging obtains modified acrylic acid emulsion；

Lotion is carried out by hydroxyethyl methacrylate, styrene, allyl acrylate, methyl methacrylate, acrylic acid to gather Reaction is closed, due to containing hydroxyl in hydroxyethyl methacrylate monomer, is made in modified acrylic acid emulsion obtained containing compared with polyhydroxy Base ,-the NCO of-OH and polyisocyanates can crosslink reaction solidification at normal temperature after coating, form three-dimensional net structure, can To improve the cohesive strength of lotion, enhance the compactness of film, improves the ageing-resistant of film, mechanical property and waterproofness；Meanwhile Contain unsaturated double-bond in allyl acrylate, so that containing unsaturated double-bond on main chain, under ultraviolet light, on main chain The double bond on pentaerythritol triacrylate in double bond and coating crosslinks reaction, makes pentaerythritol triacrylate success It is grafted in resin chain；Meanwhile pentaerythritol triacrylate is three-functionality-degree activated monomer, and under ultraviolet light, system Crosslinking points and crosslinking degree increase, and form inierpeneirating network structure, further increase the compactness of film, improve film mechanics, Waterproof performance；

The coating method of the coating, includes the following steps:

The first step, after battery cover board is first cleaned drying with distilled water, then supersound washing 30-40min in ethanol is put into 80 DEG C It is dried in baking oven；

Deionized water and wetting agent is added in second step in a reservoir, and functional stuffing is added, adds the defoaming agent of half, disperses Machine disperses 15-20min, and modified acrylic acid emulsion and curing agent is added, is eventually adding N, N- dimethylethanolamine, pentaerythrite three Acrylate and remaining half defoaming agent continue to disperse 30-40min, obtain coating；

Third step, the surface that coating is sprayed to processed battery cover board, wet-film thickness are 35-40 μm, and first room temperature stands 2- 3h, then 80 DEG C of oven drying 105s are placed in, it is finally placed under uv cure machine and irradiates 10s, complete coating.