阅读说明：本技术 一种汽车内饰低温牛皮皮革及其制备方法 (Low-temperature cow leather for automobile interior decoration and preparation method thereof ) 是由 但俊 汪翊 黄建 李新建 金海萍 吉小明 张波 于 2021-07-30 设计创作，主要内容包括：本发明涉及一种皮革的制备方法,特别涉及一种汽车内饰低温牛皮皮革及其制备方法,属于革制品技术领域。本发明通过工艺改进以及原材料的优选,涂饰时不再使用单一颜料膏,而是选择环保型综合性高性能颜料膏配合使用,解决常规种类涂饰颜料膏单一性的缺陷,并且针对该高性能颜料膏对皮革的制备方法进行了改进,严格控制个工序中高性能颜料膏的添加量,从而实现了在高温环境(60℃-80℃)下有效降低汽车内饰用的牛皮皮革成品皮表面温度。(The invention relates to a preparation method of leather, in particular to low-temperature cow leather for automobile interior decoration and a preparation method thereof, and belongs to the technical field of leather products. According to the invention, through process improvement and raw material optimization, a single pigment paste is not used any more during coating, but an environment-friendly comprehensive high-performance pigment paste is selected for matching use, so that the defect of single property of the conventional coating pigment paste is solved, the preparation method of leather is improved by aiming at the high-performance pigment paste, and the addition amount of the high-performance pigment paste in each process is strictly controlled, so that the surface temperature of the finished leather product of the cowhide leather for automobile interior decoration is effectively reduced under a high-temperature environment (60-80 ℃).)

1. A preparation method of low-temperature cow leather for automobile interior decoration comprises the steps of pre-decoration → roller bottom coating → spraying of anti-sticking layer → embossing → spraying of color layer → spraying of top layer, and is characterized in that:

in the pre-coating process, high-performance pigment paste with the weight percentage of 5-10 percent is added into the pre-coating paint,

in the process of roller priming, high-performance pigment paste with the weight percentage of 4-6 percent is added into the priming paint,

in the process of spraying the color layer, high-performance pigment paste with the weight percentage of 5-10 percent is added into the color layer coating,

in the top layer spraying process, 3-6% by weight of high-performance pigment paste is added into the top layer coating.

2. The method for preparing low-temperature cow leather for automobile interior decoration according to claim 1, wherein the method comprises the steps of:

s1, pre-coating decoration process, which is to coat a layer of pre-coating decoration paint on the cowhide blank to form a pre-coating decoration layer, wherein the pre-coating decoration paint is composed of acrylic resin and high-performance pigment paste,

s2, rolling a priming paint layer on the pre-decoration layer obtained in the step S1 by using a priming paint roller,

s3, an anti-sticking layer spraying procedure, namely, rolling a layer of anti-sticking layer on the base coat obtained in the step S2 by using an anti-sticking layer coating;

s4, an embossing process,

s5, a color layer spray coating step of performing color layer spray coating with the color layer paint on the embossed surface obtained in the step S4;

s6, a top layer spraying procedure, wherein the surface of the color layer obtained in the step S5 is subjected to top layer spraying by using a top layer coating;

and S7, finally checking and warehousing.

3. The method for preparing the low-temperature cow leather for automobile interior decoration according to claim 1, wherein the method comprises the following steps: step S1 is performed on the roll coater, starting pressure: 6-8Bar, oven temperature: at 100 +/-10 deg.c, conveying speed not more than 10m/min, roller painting for 1 time, inspecting 1/4SF after finishing, wet weight,coating amount of coating0.8-1.6g/sfAnd naturally drying for 6-12 hours.

4. The method for preparing the low-temperature cow leather for automobile interior decoration according to claim 1, wherein the method comprises the following steps: step S2 is carried out on a roller coater, the starting pressure is 6-8Bar, the oven temperature: roller coating at 100 + -10 deg.C and conveying speed of no more than m/10min for 1 time, inspecting 1/4SF after finishing, under wet weight condition,coating amount of coating1.8-2.5g/sfAnd naturally drying for 8-16 hours.

5. The method for preparing the low-temperature cow leather for automobile interior decoration according to claim 1, wherein the method comprises the following steps: step S3 is performed on the coating machineLine, injection pressure 0.3-0.5Mar, turntable speed: 10-14r/min, oven temperature: 100 ± 10 ℃, conveying speed: 10-12m/min, spraying for 1 time, under the condition of wet weight after finishing,coating amount of coating0.8-1.2g/sf。

6. The method for preparing the low-temperature cow leather for automobile interior decoration according to claim 1, wherein the method comprises the following steps: step S4 is carried out on an embossing machine, the feeding speed is controlled to be 4-6m/min, pores and veins of an embossing plate and the internal temperature of an embossing roller of the embossing machine is 70-75 ℃, and the pressure is as follows: 120-150Bar, by means of 1-time embossing.

7. The method for preparing the low-temperature cow leather for automobile interior decoration according to claim 1, wherein the method comprises the following steps: step S5 is carried out on a spray coater, the spraying pressure is 0.3-0.5Mar, the speed of a turntable is 10-14r/min, the temperature of an oven is 100 +/-10 ℃, the conveying speed is 10-12m/min, the spraying is carried out for 1 time, under the condition of wet weight after finishing,coating amount of coating1.5-2.0g/sf。

8. The method for preparing the low-temperature cow leather for automobile interior decoration according to claim 1, wherein the method comprises the following steps: step S6 is performed on the coating machine, the injection pressure is 0.3 to 0.5Mar, the turntable speed: 10-14r/min, oven temperature: 100 ± 10 ℃, conveying speed: 10-12m/min, spraying for 1 time, under the condition of wet weight after finishing,coating amount of coating1.8-2.0g/sf。

9. The method for preparing the low-temperature cow leather for automobile interior decoration according to claim 1, wherein the method comprises the following steps: the priming paint in the step S2 consists of 5 to 10 percent of water, 85 to 90 percent of resin and 4 to 6 percent of high-performance pigment paste, the total weight of the raw materials is 100 percent,

the formula of the color layer coating in the step S5 by weight percentage is: 5-10% of high-performance pigment paste, 1.0-2.0% of flatting agent, 70-80% of acrylic resin and the balance of water;

the top coating in the step S6 comprises the following components in percentage by weight: 3-6% of high-performance pigment paste, 1.5-2.5% of flatting agent, 70-75% of acrylic resin, 1-3% of hand feeling agent and the balance of water.

10. The low-temperature cow leather for automobile interior decoration prepared by the preparation method of claim 1.

Technical Field

The invention relates to a preparation method of leather, in particular to low-temperature cow leather for automobile interior decoration and a preparation method thereof, and belongs to the technical field of leather products.

Background

Automobile leather is a main high-grade decorative material of automobiles. As a high-quality, high-performance, high-technology automotive interior material, automotive leather needs to achieve perfect unification of the aesthetic concept of appearance and the requirement of interior quality of people. Currently, there are three aspects of the market's requirements for automotive leather: first, sensory requirements: the appearance is natural, the inside is compact, the embossing is plump and soft, the embossing is well shaped, the thickness is uniform, and the utilization rate is high; secondly, the market prospect of the novel low-temperature leather functional leather is good; thirdly, the quality requirement is as follows: besides some basic physicochemical indexes, the paint also has the advantages of water resistance, wear resistance, flame retardance, solvent corrosion resistance, high temperature resistance, yellowing resistance, low atomization resistance, no harm to human bodies and the like.

From a research and development process point of view, finishing is a very important process in the dry finishing stage of leather, which can impart qualitative changes from the peltry to leather and increase its commercial value. Almost all leather products require finishing operations to develop and produce. Along with the gradual enhancement of the comfort consciousness of people when riding a car and the call of consumer groups, people begin to turn to a comfort sense organ leather making method for researching a brand new concept, under the conventional condition, when the car is parked in high-temperature environments such as outdoor in summer, the temperature in the car can be gradually raised, so that drivers and passengers have obvious high-temperature discomfort when entering the car.

The key point of the development of the low-temperature leather is that the main material or the process mainly comprising the high-performance pigment paste is required to be completed in the finishing process, the conventional pigment paste is still mainly adopted by the current common factories, and the material has no other obvious characteristics except the basic color effect.

Disclosure of Invention

The invention aims to provide a preparation method of low-temperature cow leather for automobile interior decoration, which realizes the advantages of stable prepared leather coating and high-temperature environment resistance by adding a small amount of high-performance pigment paste into each coating for multiple times.

The invention also provides the automotive interior low-temperature cowhide leather which has the advantage that the overall wavelength absorptivity of the test light source rate under the environments of strong light and high heat is lower than that of a conventional product.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a preparation method of low-temperature cow leather for automobile interior decoration comprises the steps of pre-decoration → roller base coat → anti-sticking layer spraying → embossing → color layer spraying → top layer spraying, wherein:

in the pre-coating process, 5-10 wt% of high-performance pigment paste is added into the pre-coating paint, in the roller prime coating process, 4-6 wt% of high-performance pigment paste is added into the prime coating paint, in the color layer spraying process, 5-10 wt% of high-performance pigment paste is added into the color layer paint, and in the top layer spraying process, 3-6 wt% of high-performance pigment paste is added into the top layer paint. The high performance pigment paste model is Pigmafix BMW Black, and the supplier is Jiangyin Lingzhi trade company Limited.

In the conventional preparation process of the cow leather, the pigment paste is only added into the color layer coating, so that the surface bearing capacity of the leather is overlarge due to one-time addition, the integral coating structure of a leather product is not stable, the color difference is large, the physical index of the integral coating is unstable, and the peeling strength can be directly influenced along with a plurality of indexes. In order to improve the stability of the product, the inventor finally obtains the technical scheme of adding proper high-performance pigment paste in each coating process in continuous test production, and the invention achieves the optimal stable effect and does not influence other conventional performance index changes of the product by adding the pigment paste into different coatings in a plurality of times and in a small amount in the preparation process of the cowhide leather; the addition of the pigment paste in several portions contributes to an effective bonding between the layers.

Preferably, the method comprises the steps of:

s1, pre-coating decoration process, which is to coat a layer of pre-coating decoration paint on the cowhide blank to form a pre-coating decoration layer, wherein the pre-coating decoration paint is composed of acrylic resin and high-performance pigment paste,

s2, rolling a priming paint layer on the pre-decoration layer obtained in the step S1 by using a priming paint roller,

s3, an anti-sticking layer spraying procedure, namely, rolling a layer of anti-sticking layer on the base coat obtained in the step S2 by using an anti-sticking layer coating;

s4, an embossing process,

s5, a color layer spray coating step of performing color layer spray coating with the color layer paint on the embossed surface obtained in the step S4;

s6, a top layer spraying procedure, wherein the surface of the color layer obtained in the step S5 is subjected to top layer spraying by using a top layer coating;

and S7, finally checking and warehousing.

Preferably, step S1 is performed on a roll coater, where the pressure: 6-8Bar, oven temperature: 100 +/-10 ℃, the conveying speed is less than or equal to 10m/min, roll coating is carried out for 1 time, 1/4SF is checked after the roller coating is finished, the coating amount of the coating is 0.8-1.6g/SF under the wet weight condition, and the roller coating is naturally dried for 6-12 hours.

Preferably, step S2 is performed on a roll coater, start pressure 6-8Bar, oven temperature: at 100 +/-10 deg.c, conveying speed not higher than m/10min, roller painting for 1 time, checking 1/4SF, coating amount of 1.8-2.5g/SF in wet condition, and natural drying for 8-16 hr.

Preferably, step S3 is performed on the coater, with a spray pressure of 0.3 to 0.5Mar, a turntable speed: 10-14r/min, oven temperature: 100 ± 10 ℃, conveying speed: 10-12m/min, spraying for 1 time, and when the wet weight is finished, the coating amount of the coating is 0.8-1.2 g/sf.

Preferably, step S4 is performed on an embossing machine, the feeding speed is controlled to be 4-6m/min, pores of an embossing plate are arranged, the temperature in an embossing roller of the embossing machine is 70-75 ℃, the pressure: 120-150Bar, by means of 1-time embossing.

Preferably, step S5 is performed on a spray coater, spraying pressure is 0.3-0.5Mar, turntable speed is 10-14r/min, oven temperature is 100 + -10 deg.C, conveying speed is 10-12m/min, spraying is performed for 1 time, and coating amount is 1.5-2.0g/sf in wet weight after finishing.

Preferably, step S6 is performed on the coater, with a spray pressure of 0.3 to 0.5Mar, a turntable speed: 10-14r/min, oven temperature: 100 ± 10 ℃, conveying speed: 10-12m/min, 1 time of spraying, and the coating amount is 1.8-2.0g/sf under the condition of wet weight after finishing spraying.

Preferably, the priming paint in step S2 is composed of water 5-10%, resin 85-90%, and high-performance pigment paste 4-6%, the total weight of the raw materials is 100%,

the formula of the color layer coating in the step S5 by weight percentage is: 5-10% of high-performance pigment paste, 1.0-2.0% of flatting agent, 70-80% of acrylic resin and the balance of water;

the top coating in the step S6 comprises the following components in percentage by weight: 3-6% of high-performance pigment paste, 1.5-2.5% of flatting agent, 70-75% of acrylic resin, 1-3% of hand feeling agent and the balance of water.

The low-temperature cow leather for the automotive interior prepared by the preparation method.

The invention has the beneficial effects that:

1. according to the invention, through process improvement and raw material optimization, a single pigment paste is not used any more during coating, but an environment-friendly comprehensive high-performance pigment paste is selected for matching use, so that the defect of single property of the conventional coating pigment paste is solved, the preparation method of leather is improved aiming at the high-performance pigment paste, and the addition amount of the high-performance pigment paste in each process is strictly controlled, so that the surface temperature of the finished leather product of the cowhide leather for automobile interior decoration is effectively reduced under a high-temperature environment (60-80 ℃);

2. the invention improves the overall physical and chemical indexes of the product, and improves the tensile strength performance, the heat-resistant stability, the yellowing resistance, the aging resistance, the mechanical property and the like;

3. according to the invention, materials are strictly screened and all processes are carefully controlled, the high-performance pigment paste used firstly is a special material utilizing the principle of three primary colors, and the product has absolute extinction and non-heat-accumulation effects on a light source and a heat source, so that the application of the product as a low-temperature leather product is met, and the prepared leather product has the characteristics of soft and full hand feeling, high elasticity, compact leather body, flat and fine grain surface, bright color and the like, and has considerable economic benefit;

the main component of the conventional pigment paste in the market is carbon black, and the product has strong light absorption and heat absorption characteristics under the conditions of light and heat sources, and all the products can not meet the production requirements of low-temperature leather;

4. the surface of the finished leather product prepared by the invention is compared with a common leather product under the same condition for a plurality of times, the surface temperature of the finished leather product is far lower than the test value of the common leather product, and the surface temperature of the high-performance low-temperature leather is 15-20 ℃ lower than that of the common leather through tests under the conditions of the same experimental environment, temperature, time and the like, so that the higher the test environment temperature is, the larger the difference of the comparison data is. The prominent effect makes up the blank of the low-temperature cow leather for the automotive interior in the current market, effectively reduces the temperature in the automobile when the temperature in the automobile is higher under the outdoor high-temperature condition in summer, and improves the comfort of drivers and passengers in the automobile.

Drawings

FIG. 1 is a set of photographs of the leather produced in example 3 and the normal leather at room temperature in the skin temperature test.

Detailed Description

The technical solution of the present invention will be further specifically described below by way of specific examples. It is to be understood that the practice of the invention is not limited to the following examples, and that any variations and/or modifications may be made thereto without departing from the scope of the invention.

In the present invention, all parts and percentages are by weight, unless otherwise specified, and the equipment and materials used are commercially available or commonly used in the art. The methods in the following examples are conventional in the art unless otherwise specified.

High performance pigment paste, model Pigmafix BMW Black, supplier: jiangyin Lingzhi trade company, Inc.;

common leather pigment paste, model 2000Black, supplier: the Baimitanian trade company, Inc.

Examples 1 to 5

The preparation method of the low-temperature cow leather for the automotive interior comprises the steps of pre-coating → roller bottom coating → spraying of an anti-sticking layer → embossing → spraying of a color layer → spraying of a top layer, wherein the process chain treatment comprises roller repairing, spot repairing, meat sealing, standing, shaking, final inspection and leather measuring packaging, and the steps of the steps are as follows:

s1, a pre-decoration process, namely coating a layer of pre-decoration paint on the cowhide blank to form a pre-decoration layer, wherein the pre-decoration paint consists of acrylic resin and high-performance pigment paste, and the high-performance pigment paste accounts for 5-10% of the total weight of the pre-decoration paint; the specific proportions of the raw materials of each coating are shown in table 1;

run on a roll coater, start pressure: 6-8Bar, oven temperature: at 100 +/-10 ℃, the conveying speed is less than or equal to 10m/min, roller coating is carried out for 1 time, 1/4SF (coating slurry has the loading requirement according to the area calculation, the actual gram weight of the material is detected by the index) is checked after the roller coating is finished, the coating weight of the coating is 0.8-1.6g/SF under the wet weight condition, and the roller coating is naturally dried for 6-12 hours;

s2, rolling a priming paint layer on the pre-decoration layer obtained in the step S1 by using a priming paint roller,

the priming paint consists of 5-10% of water, 85-90% of resin and 4-6% of high-performance pigment paste, the total weight of the raw materials is 100%,

the method is carried out on a roller coater, the starting pressure is 6-8Bar, the oven temperature is: at 100 +/-10 ℃, the conveying speed is less than or equal to m/10min, roll coating is carried out for 1 time, 1/4SF is checked after the roller coating is finished, the coating amount of the coating is 1.8-2.5g/SF under the wet weight condition, and the roller coating is naturally dried for 8-16 hours;

s3, an anti-sticking layer spraying procedure, namely, rolling a layer of anti-sticking layer on the base coat obtained in the step S2 by using an anti-sticking layer coating;

spraying pressure of 0.3-0.5Mar, rotating disc speed: 10-14r/min, oven temperature: 100 ± 10 ℃, conveying speed: 10-12m/min, spraying for 1 time, and when the wet weight is finished, the coating amount of the coating is 0.8-1.2 g/sf;

s4, an embossing process,

the process is carried out on an embossing machine, the feeding speed is controlled to be 4-6m/min, pores and lines of an embossing plate are arranged, the temperature in an embossing roller of the embossing machine is 70-75 ℃, and the pressure is as follows: 120-150Bar, 1 time by means of formula embossing,

checking a first workpiece: compared with the pattern effect of a sample, the method has no slurry cutting and no pollution.

S5, a color layer spraying procedure,

color layer coating: the material amount is calculated by actual percentage, water 15-20%, flatting agent 0.5-1.0%, bright resin 10-17%, delustering agent 15-18%, hand feeling agent 3-7%, high performance pigment paste 5-10%, cross linker 5-10%,

spraying on a spraying machine with the spraying pressure of 0.3-0.5Mar, the rotating disc speed of 10-14r/min, the oven temperature of 100 +/-10 ℃, the conveying speed of 10-12m/min, spraying for 1 time, and the coating weight of the coating of 1.5-2.0g/sf under the condition of wet weight after finishing,

checking a first workpiece: the surface effect, gloss, color, grain, no pollution and no dripping of the sample piece are compared.

S6, a top layer spraying process,

top coating: the material amount is calculated according to the actual percentage by weight, 15-20% of water, 0.5-1.0% of flatting agent, 10-15% of bright resin, 16-22% of flatting agent, and the hand feeling agent: 3-7%, high-performance pigment paste: 1-2%, crosslinking agent: 5 to 10 percent of the total weight of the mixture,

spraying pressure of 0.3-0.5Mar, rotating disc speed: 10-14r/min, oven temperature: 100 ± 10 ℃, conveying speed: 10-12m/min, 1 time of spraying, 1.8-2.0g/sf of coating weight under the condition of wet weight after finishing spraying,

checking a first workpiece: the surface effect, gloss, color, grain, no pollution and no dripping of the sample piece are compared.

S7, final inspection, checking color, light, softness BLC standard: average value is 3.0-4.0, flatness, trimming, measuring and packaging, and warehousing.

TABLE 1 coating formulation for each example

To verify the effect, the inventor adopts the same production process, replaces the high-performance pigment paste of the invention with the conventional pigment paste (model 2000Black), and the prepared leather product is marked as the common leather, and is detected with the cowhide leather (SRT leather) prepared in each example by the temperature change detection method: at different time points, the room temperature and the surface temperatures of the leather prepared by the invention and the common leather are respectively measured by a warm gun, and the data obtained by detection are shown in a table 2.

TABLE 2 skin temperature test data (unit:. degree. C.) of leather produced in each example

In the comparison test with the common leather product under the same condition, as can be seen from the data in table 2, the surface temperature of the leather is far lower than the test value of the common leather product, and through the test under the same experimental environment, temperature, time and the like, the surface temperature of the high-performance low-temperature leather is 15-20 ℃ lower than that of the common leather, and the higher the test environment temperature is, the larger the difference of the comparison data is. The prominent effect makes up the blank of the low-temperature cow leather for the automotive interior in the current market, effectively reduces the temperature in the automobile when the temperature in the automobile is higher under the outdoor high-temperature condition in summer, and improves the comfort of drivers and passengers in the automobile.

The leather products prepared by the embodiments have soft, full and elastic hand feeling, compact leather body, flat and fine grain surface and bright color, and all the properties meet the physical and chemical property indexes in the table 3.

TABLE 3

According to the above detection data in tables 2 and 3, it can be seen that the pigment paste is added into different coatings in different times and in small amounts in the preparation process of the cowhide leather, and the addition amount of the pigment paste in the coatings in each process is strictly controlled, so that the combination of each coating achieves the best stable effect, and the surface temperature of the finished cowhide leather for automobile interior decoration is effectively reduced under the high-temperature environment (60 ℃ -80 ℃) without affecting other conventional performance index changes of the product.

The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The automobile interior low-temperature cowhide leather and the preparation method thereof provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.