阅读说明：本技术 防污、超低总碳散发、耐磨耗牛皮汽车坐垫革制造工艺 (Manufacturing process of antifouling, ultralow-total-carbon-emission and wear-resistant cowhide automobile cushion leather ) 是由 段宝荣 王全杰 张明发 唐志海 祝妙凤 赵佳 仇同济 王琦研 张凯 于 2019-05-16 设计创作，主要内容包括：本发明涉及防污、超低总碳散发、耐磨耗牛皮汽车坐垫革制造工艺,底涂涂料包括水性颜料膏、耐光性涂料、耐光性丙烯酸酯类树脂涂料、耐光性水性聚氨酯、阻燃性涂料和阳离子油；中涂涂料包括消光聚氨酯、亮光聚氨酯、交联剂、材料、耐磨耗聚氨酯、碳化二亚胺、PTFE乳液和抑制烟雾材料；顶涂涂料包括手感剂和阳离子油。所制备的牛皮汽车坐垫革在保持阻燃、耐光和低雾化的基础上,提高了汽车革的防污、超低总碳散发、耐磨耗性能。(The invention relates to a process for manufacturing antifouling, ultralow-total-carbon-emission and wear-resistant cowhide automobile cushion leather, wherein a primary coating comprises water-based pigment paste, light-resistant coating, light-resistant acrylate resin coating, light-resistant waterborne polyurethane, flame-retardant coating and cationic oil; the intermediate coating comprises delustering polyurethane, bright polyurethane, a cross-linking agent, a material, wear-resistant polyurethane, carbodiimide, PTFE emulsion and a smoke inhibiting material; the top coating includes a hand feel agent and a cationic oil. The prepared cowhide automobile cushion leather improves the antifouling, ultralow total carbon emission and wear resistance of the automobile leather on the basis of keeping flame retardance, light resistance and low atomization.)

1. The preparation method of the material B required in the manufacturing process of the antifouling, ultralow total carbon emission and wear-resistant cowhide automobile cushion leather comprises the following steps: 0.6g of 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, 3.4-6.2 g of acrylic resin, 0.15-0.30 g of o-methylbenzoyl chloride, 0.2-0.4 g of penetrating agent and 0.1-0.2 g of 4-nitro-o-phenylenediamine are mixed and stirred uniformly to obtain a material B.

2. The preparation method of the material B required in the manufacturing process of the antifouling, ultralow total carbon emission and wear-resistant cowhide automobile cushion leather comprises the following steps: the preparation method of the wear-resistant polyurethane comprises the following steps: adding 38g of polycarbonate diol with molecular weight of 2000, 9.6-11.6 g of 4, 4-diphenylmethane diisocyanate and 0.10-0.15 g of dibutyltin dilaurate into a reaction container, stirring and reacting at 70-80 ℃ for 1-3 h to obtain a polyurethane prepolymer, adding 0.6-3.1 g of hydrophilic chain extender dimethylolpropionic acid and 6.5-7.5 g of acetone solvent into the polyurethane prepolymer, and stirring and reacting at 60-80 ℃ for 0.5-1 h; and adding 2.0-3.0 g of triethylamine and 100-120 g of water for emulsification for 20-40 min to obtain the wear-resistant polyurethane.

3. The preparation method of the smoke inhibiting material required in the manufacturing process of the antifouling, ultralow-total-carbon-emission and wear-resistant cowhide automobile cushion leather comprises the following steps: mixing and stirring 0.2-0.6 g of borax, 0.8-1.2 g of ammonium molybdate, 0.1-0.4 g of polyethylene glycol and 50g of water at 50-70 ℃ for 1-2 h, heating to 80 ℃, adding 0.1-0.4 g of sodium tetrahydroxyaluminate, 1.2-1.6 g of itaconic acid and 0.2-0.7 g of diethyl ethylmalonate, and stirring and reacting for 1-2 h under the condition of controlling the pH value to be 5.0 to obtain the smoke inhibiting material.

Technical Field

The invention relates to a manufacturing process of automobile cushion leather, in particular to a manufacturing process of antifouling, ultralow-total-carbon-emission and wear-resistant cowhide automobile cushion leather.

Background

China is currently the largest automobile consumer market in the world, with over 2900 thousands of automobiles in 2017, 20% of which are fitted with genuine leather seats. With the prosperity of the automobile market, the business opportunities of automobile leather making are concerned by more and more leather enterprises. 2017 shows that the profit of the automobile leather alone keeps increasing under the environment that the profits of all products in the national leather industry generally decrease.

Chinese invention patent 201510694401.6 discloses a manufacturing process of flame-retardant, yellowing-resistant and low-fogging cowhide automobile cushion leather, which adopts a preparation process of the automobile cushion leather, wherein ammonium salt deliming is replaced by ammonium salt deliming, the atomization value of the cushion leather is reduced by high-temperature water washing, the flame retardant property of the leather is improved by the steps of retanning, fatliquoring and finishing, and the light resistance of a coating is improved by a light-resistant material. The process also adopts roller coating instead of spraying to reduce the use amount of the leather material.

Chinese patent 201510694403.5 discloses a process for manufacturing flame-retardant, light-resistant, low-fogging and degradable cow leather automobile seat cushion leather. Ammonium salt-free deliming replaces ammonium salt deliming, a tetrakis hydroxymethyl phosphonium sulfate and flame-retardant starch type leather surfactant are selected as a leather tanning agent to replace a traditional chrome tanning agent, the atomization value of cushion leather is reduced by high-temperature water washing, the flame retardant property of the leather is improved by the steps of retanning, greasing and finishing, the light resistance of a coating is improved by a light-resistant material, the use amount of a skinning material is reduced by selecting roll coating to replace spraying, and the prepared cow leather automobile cushion leather has better flame retardance and light resistance, lower atomization value and is easier to degrade.

The technical solutions disclosed in the above two patents are less related to how to implement low carbon emission, how to further improve antifouling performance, and how to improve wear resistance of finished leather. Because the automobile usually has long service life and the probability of various pollutants being stained on the surface of the automobile leather is higher, the aesthetic feeling and the service life of the automobile leather are influenced.

Disclosure of Invention

The invention aims to solve the technical problem of providing a manufacturing process of the anti-fouling, ultralow-total-carbon-emission and wear-resistant cowhide automobile seat cushion leather.

The technical scheme of the invention is as follows:

the manufacturing process of the stain-proof, ultra-low total carbon emission and wear-resistant cowhide automobile cushion leather comprises a deliming procedure and a retanning procedure

A neutralization step, a fatliquoring step and a coating step, wherein the method comprises the following steps: the coating process comprises the following steps of sequentially performing base coating, intermediate coating and top coating, wherein the coating is roll coating, the roll coating temperature is 101-105 ℃, the base coating is rolled for three times, the intermediate coating is rolled for two times, and the top coating is rolled for one time, and each layer of coating comprises the following components:

(a) the base coating comprises the following components in parts by weight: 0.5-2 parts of water-based pigment paste, 25 parts of water, 2-4 parts of light-resistant coating, 1-3 parts of light-resistant acrylate resin coating, 2-4 parts of light-resistant waterborne polyurethane, 2-7 parts of flame-retardant coating and 0.3-0.5 part of cationic oil;

the preparation method of the light-resistant coating comprises the following steps: mixing 50g of silicone-acrylic emulsion, 1-1.3 g of perfluorooctyl sulfonic acid tetraethylene amine, 0.2-0.6 g of pentaerythritol, 0.5-1.3 g of epoxy chloropropane, 0.2-0.7 g of nano titanium dioxide, 1.2-3.2 g of polyvinyl alcohol and 15-25 g of water, stirring at a high speed for 1-3 h, and reacting at 60-80 ℃ for 1-3 h to obtain the light-resistant coating;

(b) the middle coating comprises the following components in parts by weight: 40 parts of water, 20-60 parts of extinction polyurethane, 5-20 parts of bright polyurethane, 4-15 parts of a cross-linking agent, 6-12 parts of a material B, 6-12 parts of wear-resistant polyurethane, 0.3-0.6 part of carbodiimide, 0.2-0.7 part of PTFE emulsion and 0.4-0.8 part of a smoke inhibiting material;

the preparation method of the material B comprises the following steps: uniformly mixing and stirring 0.6g of 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, 3.4-6.2 g of acrylic resin, 0.15-0.30 g of o-methylbenzoyl chloride, 0.2-0.4 g of penetrating agent and 0.1-0.2 g of 4-nitro-o-phenylenediamine to obtain a material B;

the preparation method of the wear-resistant polyurethane comprises the following steps: adding 38g of polycarbonate diol with molecular weight of 2000, 9.6-11.6 g of 4, 4-diphenylmethane diisocyanate and 0.10-0.15 g of dibutyltin dilaurate into a reaction container, stirring and reacting at 70-80 ℃ for 1-3 h to obtain a polyurethane prepolymer, adding 0.6-3.1 g of hydrophilic chain extender dimethylolpropionic acid and 6.5-7.5 g of acetone solvent into the polyurethane prepolymer, and stirring and reacting at 60-80 ℃ for 0.5-1 h; adding 2.0-3.0 g of triethylamine and 100-120 g of water for emulsification for 20-40 min to obtain abrasion-resistant polyurethane;

the preparation method of the smoke inhibiting material comprises the following steps: mixing and stirring 0.2-0.6 g of borax, 0.8-1.2 g of ammonium molybdate, 0.1-0.4 g of polyethylene glycol and 50g of water at 50-70 ℃ for 1-2 h, heating to 80 ℃, adding 0.1-0.4 g of sodium tetrahydroxyaluminate, 1.2-1.6 g of itaconic acid and 0.2-0.7 g of diethyl ethylmalonate, and stirring and reacting for 1-2 h under the condition of controlling the pH to be about 5.0 to obtain the smoke inhibiting material;

(c) the top coating comprises the following components in parts by weight: 14 parts of water, 5-7 parts of a hand feeling agent and 0.2-0.3 part of cationic oil.

Preferably, the light-resistant acrylic resin coating is a carbon nanotube modified acrylic resin light-resistant coating.

Preferably, the deliming procedure comprises a pre-deliming procedure and a main deliming procedure; pre-deliming: taking the weight of the ash-soaked bare skin after trimming as a weight base, applying 0.2-0.7% of magnesium lactate and 0.2% of 2-hydroxypropionic acid for pre-deliming, wherein the bath liquid ratio is 100-150%, the bath liquid pH is about 9.5, the bath liquid temperature is controlled at 18-25 ℃, and the rotation is carried out for 60-90 min; the main deliming procedure comprises the following steps: the bath liquid ratio is 100-150%, the bath liquid temperature is 18-25 ℃, 0.2-0.7% of 4-methyl salicylic acid is added, the pH value is about 9.0, and the rotation is carried out for 60-90 min.

Preferably, the retanning procedure is: the bath liquid ratio is 100-200%, the bath liquid temperature is 40 ℃, 2-5% of tetrakis hydroxymethyl phosphonium sulfate, 1-3% of retanning type intumescent flame retardant and 2% of intumescent starch flame retardant special for leather are added, the mixture is rotated for 30-50 min, 0.2-0.6% of sodium formate is added, the mixture is rotated for 30min, then sodium bicarbonate is added to adjust the pH value to 5.0, the mixture is rotated for 40min, the mixture is washed twice with water at 50 ℃ for 10min each time, and liquid is discharged.

Preferably, the retanning intumescent flame retardant is prepared according to example two of 201010013610.7.

Preferably, the leather-specific intumescent starch flame retardant is prepared according to example three of 201010534448.3.

Preferably, the neutralization step: taking the weight of the shaved skin after trimming as the weight base, the bath lotion ratio is 120%, the bath lotion temperature is 34-36 ℃, sodium formate is added for 0.8-1.0%, the operation is carried out for 30-50 min, sodium carbonate is added for 0.4-0.7%, the operation is carried out for 40-60 min again, water washing is carried out twice by using water at 55-60 ℃, and liquid discharging is carried out.

Preferably, the step of fatliquoring comprises: taking the weight of the shaved skin after trimming as the weight base, 80% of bath lotion, 38-42 ℃ of bath lotion, 5-11% of fatting agent SE, 30-60 min of rotation, 1-3% of flame-retardant phosphorylated fatting agent A and 2-4% of flame-retardant phosphorylated fatting agent B, 60-90 min of rotation, 100% of water addition, adjustment of bath lotion temperature to 48-52 ℃, 60-90 min of rotation, 1.5-2.0% of formic acid addition, 60-90 min of rotation, washing twice with 62-65 ℃ water, and discharging liquid.

Preferably, the flame retardant phosphorylated fatliquor a is prepared according to example two of 201210416063.6; the flame retardant phosphorylated fatliquor B was prepared according to example one of 201410430147.4.

Preferably, the acrylic resin is prepared according to the first embodiment of patent 201410159426.1.

The invention has the positive effects that:

(1) the TOC can be effectively reduced through a series of technical means such as ammonia-free deliming, critical temperature water washing after tanning, associative fatliquoring, high-strength vacuum treatment, perfection of a coating material molecular inter-chain net structure and the like, and the automobile cushion leather with low atomization and ultralow total carbon emission is obtained. In the process of reducing TOC and atomization value, the invention adopts the following five measures:

a) and the ammonium salt deliming is replaced by ammonium salt-free deliming, and magnesium citrate, magnesium chloride, magnesium 2-hydroxy-1, 2, 3-tricarballylic acid, magnesium ethyl chloride, magnesium methacrylate, magnesium lactate, 4-methyl salicylic acid, potassium acetate and potassium gluconate are used as ammonium-free deliming agents, so that the ammonia nitrogen content in the wastewater and the atomization value of the automobile leather are reduced.

b) And after tanning, washing with water at critical temperature, greatly increasing the washing temperature of the neutralization, retanning and fatliquoring procedures to 50 ℃, 55 ℃ and 65 ℃ respectively in a safe range, and fully washing off small molecular compounds, thereby effectively reducing the total carbon emission of the leather.

c) The combined flame-retardant fat-liquoring agent is adopted, and the starch-based surfactant is utilized to promote the uniform penetration of grease, so that bath lotion is clear, the grease absorption rate reaches 95%, the leather fibers are firmly combined, and the generation of free grease is obviously reduced.

d) And the washed leather blank is subjected to high-strength vacuum treatment, so that residual volatile micromolecular compounds can be quickly removed in a short time.

e) The matting agent, the soft water polyurethane resin, the medium hard polyurethane resin and the isocyanate crosslinking agent of the coating material are matched, so that the inter-molecular-chain net structure of the coating material is improved, the volatilization of small molecular substances is delayed, and the TOC is reduced.

(2) The invention prepares and adopts the PUD finishing agent which is formed by crosslinking polycarbonate diol and isocyanate and is used as wear-resistant polyurethane, and adopts the synergistic finishing method of double-layer polytetrafluoroethylene copolymer reinforced top coating and polyurethane, thereby increasing the charge adjustment and static electricity removal procedures of wet leather blanks, and effectively solving the technical problems which are difficult to solve by the prior art that automobile leather is easy to yellow under sunlight solarization and the coating is fragile and has poor dustproof effect under repeated friction.

(3) Aiming at the problems that the service life of an automobile is long, various pollutants are attached to the surface of automobile leather, and the service life and the aesthetic feeling of an automobile leather coating are influenced, the dyeing process disclosed by the invention is used for carrying out electrostatic conditioning after dyeing, adjusting the charge states of various ions in a leather blank under a wet condition, eliminating strong-polarity ions, and simultaneously adding an electrostatic removing process between a primary coating drying process and an embossing process, wherein the two processes are combined to ensure the three-proofing treatment effect of the automobile cushion leather.

The leather is covered with the cationic assistant to change the surface charge of the coating, so as to reduce the dust adsorption of the leather, and the inner sealing layer and the bottom sealing layer are covered on the leather blank layer and are used as supporting base materials, so that the flatness of the leather is increased, the leather body is full, soft and elastic, and the leather surface is smoother and brighter. Meanwhile, an adhesive layer is added between the leather coatings, delamination is prevented through good permeation, and an elastic coating film with excellent support flexibility is formed through curing at a certain temperature, so that the texture of the leather is improved, and interlayer combination is promoted. The synergistic effect of the double-layer polytetrafluoroethylene copolymer reinforced top coating and polyurethane is adopted, so that the leather has better wear resistance, and the wear resistance can reach the outstanding effect that the leather is rubbed by CS-10 for 500 times under the load of 10N without obvious damage and peeling.

The carbodiimide promotes the crosslinking of the wear-resistant polyurethane in the leather finishing, the 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide is used as a light absorbent, o-methylbenzoyl chloride and 4-nitrophthalimide are used for improving the absorption effect of the light absorbent, dust organic matters are degraded, a penetrating agent JFC is used for promoting the penetration of the light absorbent in the leather, and the absorption of the light absorbent is improved to the maximum extent due to the penetration of the light absorbent from the surface of the leather to the inside.

(4) In the light-resistant material components, the SD-528 silicone-acrylic emulsion has strong adhesive force, good water resistance and excellent weather resistance, the perfluorooctyl sulfonic acid tetraethylene amine has waterproof and dustproof functions, the nano titanium dioxide can absorb heat on the surface and promote a compact carbon layer to be formed on the surface of a synthetic product of pentaerythritol and epichlorohydrin, and the light-resistant material has excellent specular reflection effect and achieves the effect of further improving the light resistance.

(5) The invention utilizes borax, ammonium molybdate and the like to control the automobile leather to release smoke, and the tetrahydroxy sodium aluminate, itaconic acid, borax and ammonium molybdate carry out complex reaction in diethyl ethylmalonate to promote the binding reaction of borax and ammonium molybdate with the surface of the automobile leather, thereby further improving the wear resistance of the leather.

Detailed Description

The invention is further illustrated by the following examples.

The process steps of the embodiment of the invention are as follows:

(1) and pre-soaking: weighing the raw skin as the base number of the material dosage and the bath lotion ratio in the step (1), applying 0.10% of a bactericide (Badericids 72, Huiying Xingying leather Co., Ltd.), 0.15% of a water immersion aid (Humectan RDL, Huiying Xingying leather Co., Ltd.), 0.4% of soda ash, controlling the bath lotion ratio at 400%, the bath lotion temperature at 20-22 ℃, the bath lotion pH at 8.8-9.2, the baume degree at 8, rotating for 5min every 60min, running for 18h in total, and sequentially removing meat, trimming edges and weighing as the material dosage and the base number of the bath lotion ratio in the steps (2) to (4) on the next day.

Actually measured water filling data: 55% of water is filled in the loose part of the raw hide and 25% -30% of water is filled in the tight part of the raw hide.

(2) Main soaking: applying 0.3% of bactericide (Badericids 72, Cicer sinense leather Co., Ltd.), 0.3% of water immersion auxiliary agent (Humectan RDL, Cicer sinense leather Co., Ltd.), 0.3% of soda ash, controlling the bath liquid ratio at 700%, the bath liquid temperature at 18-20 ℃, the bath liquid pH at 9.8-10.2, the Baume degree at 3-4, mainly immersing in the bath liquid, rotating for auxiliary, rotating for 5min every 60min, and totally 20 h.

Actually measured water filling data: the loose part is filled with water by 80 percent, and the tight part is filled with water by 60 percent.

(3) And (3) grey coating and alkali unhairing: and (3) performing a conventional ash coating alkali unhairing process.

(4) And liming: applying 0.6% liming aid (Dermollanar, shineagon, leather Co., Ltd.), 0.4% sodium hydrosulfide, 1.5% sodium sulfide (added in three batches), 1.4% lime, 90% bath lotion ratio, 24 ℃ bath lotion temperature, 180min rotation time, bath lotion pH11, stopping blowing overnight, removing meat, trimming, weighing as the material usage amount and bath lotion ratio base number of the steps (5) to (9).

(5) Pre-deliming: 0.7 percent of magnesium lactate and 0.2 percent of 2-hydracrylic acid are applied for pre-deliming, the bath liquid ratio is 150 percent, the bath liquid pH is 9.5, the bath liquid temperature is controlled at 25 ℃, and the rotation is carried out for 60 min.

(6) Main deliming: the bath liquid ratio is 100%, the bath temperature is 25 deg.C, and deashing agent A0.7%, pH9.0, is added, and the rotation is carried out for 90 min.

The deliming agent A is 4-methyl salicylic acid.

(7) Softening: and (5) carrying out a conventional softening process.

(8) And pickling: the bath liquid ratio is 70%, the bath temperature is 19-20 ℃, the salt is 9%, the rotation is 40min, the baume degree is adjusted to 8-10, 0.8% of sodium formate and 4.2% of sulfuric acid are added, the rotation is 90min, the pH is 2.5, two thirds of the bath liquid is poured out, and the step (9) is carried out.

(9) Tanning: HLS high absorption chrome tanning agent 4.2% (brother chemical limited company), rotate 2h, add baking soda 0.9%, add in three times, interval 20min, add and rotate 6h, found: the pH value is 4.2-4.5.

(10) And (3) aging: and (5) taking out the cowhide from the drum, and aging for 48 h.

(11) Squeezing water and shaving evenly: shaving the thickness to 1.8-2.0 mm, and weighing as the base numbers of the material dosage and bath lotion ratio in the steps (12) to (15).

(12) And (3) rewetting: the bath liquid ratio is 250%, the bath temperature is 35 ℃, 0.2% of formic acid and 0.5% of degreasing agent FA (Clainen chemical Co., Ltd.) are added, the temperature is 40min, the pH is 3.5, and the liquid is discharged after being washed twice for 10min each time.

(13) Retanning: the bath liquid ratio is 200%, the bath liquid temperature is 40 ℃, 2% of tetrakis hydroxymethyl phosphonium sulfate, 3% of retanning type intumescent flame retardant and 2% of special intumescent starch flame retardant for leather are added, the mixture is rotated for 50min, 0.6% of sodium formate is added, the mixture is rotated for 30min, then sodium bicarbonate is added to adjust the pH value to 5.0, the mixture is rotated for 40min, the mixture is washed twice with water at 50 ℃ and discharged after 10min each time.

Wherein, the retanning type intumescent flame retardant is prepared according to the second example of the preparation method of the retanning type intumescent flame retardant in Chinese patent 201010013610.7.

The special intumescent starch flame retardant for leather is prepared according to the third example of the 'preparation method of special intumescent starch flame retardant for leather' in Chinese patent 201010534448.3.

(14) And neutralizing: the bath lotion is 120%, the bath lotion temperature is 35 ℃, sodium formate is added at 0.8%, the bath lotion is rotated for 40min, sodium carbonate is added at 0.4-0.7%, the bath lotion is rotated for 50min, the pH is adjusted to 5.2, the bath lotion is washed twice with water at 55 ℃ for 10min each time, and the liquid is discharged.

(15) And fat liquoring: the bath liquid is 80 percent, the bath temperature is 40 ℃, the fatting agent SE 11 percent is added (Shanghai leather chemical plant), the operation is carried out for 60min, the flame-retardant phosphorylated fatting agent A3 percent and the flame-retardant phosphorylated fatting agent B4 percent are carried out for 1h, the water is added for 100 percent, the bath temperature is adjusted to 50 ℃, the operation is carried out for 60min, the formic acid is added for 1.5 percent, the operation is carried out for 60min, the bath liquid is washed twice with 65 ℃ water, 10min is carried out each time, and the vacuum drying is carried out under-1.

Wherein, the flame-retardant phosphorylated fatliquor A is prepared according to the second example of the preparation method of the flame-retardant phosphorylated fatliquor in Chinese patent 201210416063.6.

The flame-retardant phosphorylated fatliquor B is prepared according to the first example of the preparation method of flame-retardant phosphorylated fatliquor in Chinese patent 201410430147.4.

(16) Hanging and airing, drying and dampening: carrying out a conventional process;

(17) and coating: and sequentially carrying out base coating, intermediate coating and top coating, wherein the coating adopts roller coating, the roller coating temperature is 102 ℃, the base coating is rolled for three times, the intermediate coating is rolled for two times, and the top coating is rolled for one time. The coatings of each layer were as follows:

(a) and (3) priming coating: the paint comprises the following components in parts by weight: aqueous pigment paste NEOSAN 2000 (clariant chemical limited), 2 parts, 25 parts of water, 4 parts of light-resistant paint, 3 parts of carbon nanotube modified acrylic resin light-resistant paint, 4 parts of light-resistant aqueous polyurethane, 7 parts of flame-retardant paint (prepared in example 3 of 201410324852.6), 0.4 part of Euderm oil KWO-C as cationic oil (cationic, langerhans chemical);

the preparation method of the light-resistant coating comprises the following steps: 50g of SD-528 silicone-acrylate emulsion (Nantong Shengda chemical Co., Ltd.), 1.3g of perfluorooctyl sulfonic acid tetraethylene amine, 0.6g of pentaerythritol, 1.3g of epichlorohydrin, 0.7g of nano titanium dioxide, 3.2g of polyvinyl alcohol and 20g of water are mixed, stirred at a high speed for 2h and reacted at 80 ℃ for 2h to obtain the light-resistant coating.

The carbon nanotube modified acrylic resin light-resistant paint is prepared according to an example one of the methods for preparing a carbon nanotube modified acrylic resin light-resistant paint disclosed in the Chinese patent 201310127206.6.

The light-resistant aqueous polyurethane is prepared according to example two of Chinese patent 201310407835.4 "a method for preparing a light-resistant aqueous polyurethane coating".

The flame-retardant coating material was prepared according to example 3 of "a method for preparing a flame-retardant core-shell type aqueous acrylic resin coating material" of chinese patent 201410324852.6.

(b) And intermediate coating: the paint comprises the following components in parts by weight: 40 parts of water, 60 parts of MATT polyurethane MATT 200 (Wenzhou national Shibang high polymer material Co., Ltd.), 20 parts of glossy polyurethane HPV-C (CyTEG Co., USA), 15 parts of crosslinking agent XL-701 (Starter Co., USA), 12 parts of material B, 12 parts of abrasion-resistant polyurethane, 0.6 part of carbodiimide, 0.7 part of PTFE emulsion (New tetrafluoro Material Co., Ltd.), and 0.8g of smoke-inhibiting material.

The preparation method of the material B comprises the following steps: 0.6g of 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, 6.2g of acrylic resin, 0.2g of o-methylbenzoyl chloride, 0.4g of penetrant JFC0 (New Wilkinson washing products, Ltd., Shenzhen) and 0.1g of 4-nitrophthaldiamine are mixed and stirred uniformly to obtain a material B. Wherein the acrylic resin is prepared according to the example I of the preparation method of the light-resistant acrylic resin coating in Chinese patent 201410159426.1.

The preparation method of the wear-resistant polyurethane comprises the following steps: adding 38g of polycarbonate diol with molecular weight of 2000, 11.6g of 4, 4-diphenylmethane diisocyanate and 0.11g of dibutyltin dilaurate into a 250ml four-neck flask provided with a stirring paddle, a thermometer and a condenser, reacting for 1h at 70 ℃ to obtain a polyurethane prepolymer, adding 3.1g of hydrophilic chain extender dimethylolpropionic acid and 7.1g of acetone solvent into the polyurethane prepolymer, and reacting for 1h at 80 ℃; then 2.0g of triethylamine is used for neutralization, and finally 120g of water is added for emulsification for 20min to obtain the abrasion-resistant polyurethane.

The preparation method of the smoke inhibiting material comprises the following steps: mixing 0.6g of borax, 1.2g of ammonium molybdate, 0.4g of polyethylene glycol and 50g of water at 70 ℃ and stirring for 2h, heating to 80 ℃, adding 0.4g of sodium tetrahydroxy aluminate, 1.4g of itaconic acid and 0.7g of diethyl ethylmalonate, and stirring and reacting for 2h under the condition of controlling the pH value to be 5.0 to obtain the smoke inhibiting material.

(c) And top coating: the paint comprises the following components in parts by weight: 14 parts of water, 2229W (Shandong Chuan commercial Co., Ltd.), 6 parts of hand feeling agent and 0.2 part of Euderm oil KWO-C (cation, Langsheng chemical) as a cation oil.

The chemical materials of unspecified factories related to the embodiment of the invention can be replaced by the similar products of the shinning-xing leather company Limited.

The flame-retardant, yellowing-resistant and low-fogging cow leather automobile cushion leather prepared according to the embodiment of the invention and the existing similar automobile cushion leather are respectively detected, and the detection data are as shown in the following table.

TABLE 1 antifouling, ultra-low total carbon emission, abrasion-resistant Kraft automotive seat cushion leather Performance

Item	Automobile cushion leather prepared by the inventionThe result of the detection	Automobile seat cushion leather detection result of comparison file
			Moist Heat stability/. degree.C	94	95
Tensile strength/MPa	16.7	16.2
			Maximum elongation at break/%)	43	44
Dry rub colour fastness/grade	4.5	4.5
			Wet rub colour fastness/grade	4.5	4.0
Coating adhesion fastness/(N/10 mm)	7.3	5.6
			Dry heat shrinkage temperature/. degree.C	155	140
Light resistance/grade	4~5	4~5
			Atomization value/mg	3.1	4.2
Oxygen index/%	32	32
			Duration of continuous combustion/s	3	5
Smoldering time/s	0.1	3
			Tobacco density/%	12.4	29.7
Ultra low total carbon emission/μ gC/g	31.25	86.32
			Anti-fouling (nail polish)	Nail polish resistant	Nail polish intolerance
Abrasion resistance (CS-10,1000g,500 times)	No obvious damage and peeling	Small amount of damage and exfoliation

From the above table, the technical indexes of the prepared cow leather for the automobile seat cushion are superior to those of the existing similar automobile seat cushion leather in the aspects of flame retardance, atomization, light resistance and the like, and meanwhile, the antifouling performance of the cow leather for the automobile seat cushion is superior to that of a comparison document (201510694401.6) as shown by tests of lipstick, a color pen and the like in antifouling.

TABLE 2 Properties of the materials without addition of parts

Item	Detection result of automobile cushion leather prepared by the invention	Without addition of part of material
			Tobacco density/%	41.2	Smoke suppressing material
Tobacco density/%	32.5	Ethylmalonic acid diethyl ester
			Abrasion resistance (CS-10,1000g,500 times)	Small amount of damage and exfoliation	Abrasion-resistant polyurethane
Light resistance/grade	2~3	Light-resistant coating
			Light resistance/grade	3~4	Pentaerythritol
Light resistance/grade	3~4	Epoxy chloropropane
			Light resistance/grade	2~3	Material B
Light resistance/grade	3~4	4-Nitro-o-phenylenediamine
			Anti-fouling (nail polish)	Nail polish intolerance	Material B
Light resistance/grade	2~3	Carbodiimides
			Ultra low total carbon emission/μ gC/g	61.25	Carbodiimides

As can be seen from Table 2, the performance of the material without adding the above-mentioned part is reduced, and the data test is carried out without adding a certain material and adding other materials.