CN114875687A - A bio-based degradable permeable spunlace cloth polyurethane synthetic leather veneer finished product - Google Patents

Abstract

The application relates to a bio-based degradable permeable spunlace cloth polyurethane synthetic leather veneer product, and relates to the technical field of synthetic leather production. The base fabric of the finished product is viscose nylon blended spunlace non-woven fabric. coating. First, graphene, ramie fiber powder, carboxymethyl cellulose, calcium gluconate and DMF are added to the vacuum stirring tank for stirring, then bio-based degradable polyurethane resin is added for stirring, vacuum degassing is carried out and then filtered for standby preparation. Apply working paste. In the second step, the biodegradable polyurethane resin in the coating slurry is solidified on the surface of the base cloth. The third part is washed with clean water, and the DMF is washed. The fourth step is to use an oven to preheat, iron, dry and shape to obtain the bottom embryo. The fifth step is to coat and scrape the solvent-based biodegradable polyurethane on the release paper, put it in an oven to heat to form a film, and then use the above-mentioned composite to fit the previous bottom embryo, and then dry to obtain a finished product. The present application has the effects of reducing pollution to the surrounding environment and protecting the health of personnel.

Description

A bio-based degradable permeable spunlace cloth polyurethane synthetic leather veneer finished product

technical field

The application relates to the technical field of synthetic leather production, in particular to a bio-based degradable permeable spunlace cloth polyurethane synthetic leather veneer finished product.

Background technique

At present, due to the wide range of uses of leather, such as the production of shoes and boots, the production of furniture, the production of luggage, etc., various kinds of leather are widely used, and the composition and structure of natural leather can be simulated as plastic products that can be used as substitute materials. Usually, the impregnated non-woven fabric is used as the mesh layer, and the microporous polyurethane layer is used as the grain layer. Its front and back are very similar to leather, and have a certain breathability, which is closer to natural leather than ordinary artificial leather.

In the related art, most synthetic leathers are made of non-woven fabrics with 100% chemical synthetic fibers (polyester, nylon) as the base, coated with synthetic resins and various plastics. It pollutes the environment, and most chemical fibers are uncomfortable to wear due to their incompatibility to the skin. And most of the synthetic leather manufacturing process uses dimethylformamide organics as the main solvent, which makes a large amount of dimethylformamide waste water and waste gas generated in the synthetic leather manufacturing. Or the synthetic leather is disposed of by burying the synthetic leather.

In view of the above-mentioned related technologies, the inventor believes that the biodegradation of synthetic leather is slow, and whether the synthetic leather is disposed of by burning or landfilling after use, it will cause pollution to the surrounding environment and endanger human health.

SUMMARY OF THE INVENTION

In order to improve the slow biodegradation of synthetic leather, no matter whether the synthetic leather is disposed of by burning or landfilling after use, it will cause pollution to the surrounding environment and endanger the health of personnel. The present application provides a bio-based degradable permeable spunlace cloth Finished polyurethane synthetic leather veneer.

A bio-based degradable permeable spunlace cloth polyurethane synthetic leather veneer product provided by the application adopts the following technical scheme:

A bio-based degradable spunlace cloth polyurethane synthetic leather veneer finished product, the base fabric of the synthetic leather veneer finished product is a spunlace non-woven fabric blended with viscose and nylon; the preparation steps of the finished product are: first The first step is to directly coat the coating slurry with the bio-based degradable polyurethane resin on the base cloth; the second step is to solidify, so that the bio-based degradable polyurethane resin in the coating slurry is solidified on the surface of the base cloth; the third step is to solidify. The first step is to wash the base cloth with clean water to wash the DMF on the base cloth; the fourth step is to preheat, iron, dry and shape at 120-160 ° C to obtain the bottom embryo; the fifth step is to degrade the solvent-based bio-based The polyurethane resin is coated and scraped on the release paper, and then the release paper coated with the bio-based degradable polyurethane resin is put into an oven to heat to form a film; the sixth step is to attach the film to the bottom embryo, and then dry to obtain a finished product . The coating slurry is 60-70 parts of biodegradable polyurethane resin, 30-40 parts of polyurethane resin, 100 parts of DMF, 5-10 parts of carboxymethyl cellulose, 5-10 parts of ultrafine graphene, 5-10 parts of ramie fiber powder 10 servings, calcium gluconate 2-5 servings.

Optionally, the preparation process of the coating slurry is to first add ultrafine graphene, ramie fiber powder, carboxymethyl cellulose, calcium gluconate and DMF into the vacuum stirring tank and stir at 500-800r/min for 30min, Then, bio-based degradable polyurethane resin is added, and the bio-based degradable polyurethane resin is stirred at 1000-1500 r/min for 60-120 minutes, followed by vacuum defoaming for 60-120 minutes, and finally filtered with 180-200 mesh for use to prepare a coating slurry .

Optionally, in the second step, the specific step of solidification is to perform a cold air drying and solidification process for 1-2 hours on both sides of the base cloth under the condition of a temperature of 20-25°C.

Optionally, in the third step, the specific step of washing the base fabric is that the base fabric passes through the No. 1 pool, the No. 2 pool, and the No. 3 pool in sequence at a speed of 0.5m/s, and the base fabric is immersed in the pool when passing through the pool. Medium; the No. 1 pool is salt water, and the No. 2 and No. 3 pools are clear water.

Optionally, in the fourth step, the time for ironing the base fabric is 1-3min, the temperature for drying the base fabric is 120-160°C, and the drying time for the base fabric is 4-8min, and the temperature for shaping the base fabric is 120-160°C. It is 120℃-160℃, and the time is 5-9s.

Optionally, in the fifth step, the release paper passes through the No. 1 scraper, the No. 2 scraper, and the No. 3 scraper in sequence, and the No. 1 scraper, the second scraper, and the third scraper respectively include: No. 1 scraper, No. 2 scraper and No. 3 scraper, the distance between the No. 1 scraper and the release paper is 7-9cm, the distance between the No. 2 scraper and the release paper is 1-3cm, and the The distance between the No. 3 doctor blade and the release paper is 0.2-0.6 cm.

Optionally, in the fifth step, the temperature at which the oven heats the release paper is 120-160°C.

Optionally, in the sixth step, the temperature of drying the bonded film and the bottom embryo is 30-50°C.

Optionally, the ratio of viscose and nylon blended in the spunlace non-woven fabric is 1:1.

To sum up, the application includes the following beneficial technical effects of at least one bio-based degradable permeable spunlace cloth polyurethane synthetic leather veneer finished product:

In application, the base fabric of the finished synthetic leather veneer is made of viscose nylon blended spunlace non-woven fabric. The first step is to coat the base fabric directly. The coating materials are bio-based degradable polyurethane resin, ordinary polyurethane resin, DMF, Carboxymethyl cellulose, ultrafine graphene, ramie fiber powder and calcium gluconate. First, graphene, ramie fiber powder, carboxymethyl cellulose, calcium gluconate and DMF are added to the vacuum stirring tank for stirring, then bio-based degradable polyurethane resin is added for stirring, vacuum degassing is carried out and then filtered for standby preparation. Apply working paste. In the second step, the biodegradable polyurethane resin in the coating slurry is solidified on the surface of the base cloth. The third part is washed with clean water, and the DMF is washed. In the fourth step, the bottom embryo is obtained by preheating, ironing, drying and shaping in an oven. The fifth step is to coat and scrape the solvent-based biodegradable polyurethane on the release paper, put it in an oven to heat to form a film, and then use the above-mentioned composite to fit the previous bottom embryo, and then dry to obtain a finished product.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are some, but not all, embodiments of the present application. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. Words like "a" or "an" used in the description of the patent application and the claims of the present application do not indicate a quantitative limitation, but indicate that there is at least one.

The embodiment of the present application discloses a bio-based degradable permeable spunlace cloth polyurethane synthetic leather veneer finished product.

Synthetic leather is a plastic product that simulates the composition and structure of natural leather and can be used as a substitute material. During the preparation process of synthetic leather, the impregnated non-woven fabric is usually used as the mesh layer, and the microporous polyurethane layer is used as the mesh layer. Grain layer obtained. After improvement by the designers, a bio-based degradable permeable spunlace cloth polyurethane synthetic leather veneer finished product. The base fabric of the finished product is a spunlace non-woven fabric blended with viscose and nylon. The blend ratio is 1:1.

Example 1:

The preparation steps of the synthetic leather veneer finished product are:

The first step: coating the coating slurry with bio-based degradable polyurethane resin directly on the base cloth; the coating slurry is 60 parts of bio-based degradable polyurethane resin, 30 parts of polyurethane resin, 100 parts of DMF, carboxymethyl fiber 5 parts of vegetarian, 5 parts of ultrafine graphene, 5 parts of ramie fiber powder, 2 parts of calcium gluconate.

The preparation process of the coating slurry is as follows: firstly adding ultrafine graphene, ramie fiber powder, carboxymethyl cellulose, calcium gluconate and DMF into a vacuum stirring tank and stirring at 500r/min for 30min, and then adding bio-based degradable Polyurethane resin, biodegradable polyurethane resin was stirred at 1000r/min for 60min, then vacuum defoamed for 60min, and finally filtered with 180 mesh for use to prepare coating slurry.

Bio-based degradable polyurethane resin is bio-based modified polyurethane resin, which is composed of water-based bio-based modified high-solid polyol and bio-based modified isocyanate. The ratio is 2:3.

After fully mixing the water-based bio-based modified high-solids polyol and bio-based modified isocyanate in proportion, they were baked at a temperature of 115° C. for 10 minutes to obtain a bio-based modified polyurethane resin.

The second step: make the bio-based degradable polyurethane resin in the coating slurry solidify on the surface of the base cloth, and the specific step of solidification is to cool both sides of the base cloth for 1 hour at a temperature of 20 °C. Air-drying solidification process.

The third step: wash the base cloth with clean water, and wash the DMF on the base cloth. The specific steps of washing the base cloth are: When passing through the pool, the base cloth is immersed in the pool; the No. 1 pool is salt water, and the No. 2 and No. 3 pools are clear water.

It should be noted that the base cloth impregnated with the slurry is continuously conveyed by setting a power roller device, and the whole device is arranged directly above all the pools, and since the first pool, the second pool, and the third pool are separated from each other , when the base cloth is running under a certain power, the whole is wavy, the base cloth between each two power rollers is in the shape of an arc, the base cloth is located at the bottom of the arc shape and immersed in the pool, The time is determined according to the running speed of the power roller, and the movement mode of the power roller can also adopt regular intermittent motion. The duration of each movement is longer than the static duration, so that the base fabric can be relatively extended in the pool after each change of position. The time of immersion in the medium is increased to improve the removal effect of DMF in the base fabric.

Moreover, because the base cloth is in the shape of an arc, the DMF in the base cloth will gradually gather at the bottom of the arc under the action of gravity due to the existence of the inclined angle of the base cloth immersed in the pool, which is convenient for the solution and DMF in the pool to be sufficient. mix.

Each time the power roller runs, the width of the base fabric immersed in the pool is the same. The width can be controlled by setting the running speed and running time of the power roller. For optimization, the base fabric is immersed in the water surface along the running direction. Symmetrical planes are set symmetrically. The length of the width submerged in the pool is called the lower half arc, and the length of the width exposed on the water surface is called the upper half arc. For example, after each operation, the upper half arc is exposed on the water surface. After that, it will switch to being immersed in the pool, which is the lower half of the arc, so set up, when a lower half of the arc is cleaned in the first pool for the first time, it emerges from the first pool and becomes the upper half of the arc. , and then transformed into the lower half arc section into the second pool for the second cleaning, the same can be obtained, and then the same lower half arc section enters the third pool for the third cleaning. In this way, the entire base fabric is divided into multiple upper or lower arc segments with the same length. DMF in the base fabric can be cleaned when it is in the lower half arc, and can be cleaned in the upper half arc. Under the action of gravity, the DMF in the base fabric is collected in the lower half arc, and all the base fabrics can be fully washed with water for many times, which improves the removal efficiency of DMF in the base fabric.

Moreover, the advantage of this water washing method is that when the base fabric gradually leaves the pool during the running process, since it is about to ascend, the base fabric is inclined at this time, and the water will fall under the action of gravity. Since DMF can dissolve in water, the internal The residual DMF will be separated from the base cloth with the water under the action of gravity, which can better improve the removal effect of DMF in the base cloth.

In summary, reasonable adjustment of the working parameters of the power roller and the running state of the layout base fabric can make the base fabric perform continuous multiple cleanings, and it is precisely because of this that the DMF removal effect of the base fabric is the best.

The fourth step: preheating, ironing, drying and shaping the base fabric to obtain the bottom embryo, preheating at 120 ° C, ironing the base fabric for 1min, drying the base fabric at 120 ° C, and the base fabric The drying time is 4min, the temperature of the shaping base fabric is 120℃, and the time is 5s.

The fifth step: apply the solvent-based biodegradable polyurethane resin to the release paper, and then put the release paper coated with the biodegradable polyurethane resin into the oven to heat to form a film; No. 1 scraper, No. 2 scraper, and No. 3 scraper, the No. 1 scraper, No. 2 scraper, and No. 3 scraper respectively include No. 1 scraper, No. 2 scraper and No. 3 scraper, the No. 1 scraper The distance from the release paper is 9cm, the distance between the No. 2 scraper and the release paper is 3cm, and the distance between the No. 3 scraper and the release paper is 0.6cm. The temperature at which the oven heats the release paper is 120°C.

In the process of use, if the biodegradable polyurethane resin is applied to the release paper in one step, it will easily lead to the formation of air bubbles. , so that the effect of biodegradable polyurethane resin coating on the release paper can be improved to prevent the appearance of air bubbles.

The sixth step: bonding the film and the bottom embryo, and then drying, and drying the film and the bottom embryo at a temperature of 30° C., and finally obtaining a finished product.

To test the surface integrity of semi-finished synthetic leather, method 1: use carbon 12 isotope method to determine the content of organic substances greater than 35%; method 2: use fluorescence spectrometer to determine that the content of heavy metals is lower than the EU standard; method 3: use gas image liquid mass spectrometer Determination of DMF content is lower than the EU standard; Method 4: Use the jungle test method to determine the 14-day aging resistance without damage. Finally, the qualified finished synthetic leather is rolled up.

Example 2:

The preparation steps of the synthetic leather veneer finished product are:

The first step: coating the coating slurry with bio-based degradable polyurethane resin directly on the base cloth; the coating slurry is 65 parts of bio-based degradable polyurethane resin, 35 parts of polyurethane resin, 100 parts of DMF, carboxymethyl fiber 7.5 parts of calcium gluconate, 7.5 parts of ultrafine graphene, 7.5 parts of ramie fiber powder, and 3.5 parts of calcium gluconate.

The preparation process of the coating slurry is to first add ultrafine graphene, ramie fiber powder, carboxymethyl cellulose, calcium gluconate and DMF into a vacuum stirring tank and stir at 650 r/min for 30 minutes, and then add bio-based degradable materials. Polyurethane resin, biodegradable polyurethane resin was stirred at 1250r/min for 90min, then vacuum defoamed for 90min, and finally filtered with 190 mesh for use to prepare coating slurry.

Bio-based degradable polyurethane resin is bio-based modified polyurethane resin, which is composed of water-based bio-based modified high-solid polyol and bio-based modified isocyanate. The ratio is 2:3.

After fully mixing the water-based bio-based modified high-solids polyol and bio-based modified isocyanate in proportion, they were baked at a temperature of 115° C. for 10 minutes to obtain a bio-based modified polyurethane resin.

The second step: make the bio-based degradable polyurethane resin in the coating slurry solidify on the surface of the base cloth, and the specific step of solidification is to carry out 1.5h on both sides of the base cloth at a temperature of 22.5 ℃. Cold air drying and solidification process.

The third step: wash the base cloth with clean water, and wash the DMF on the base cloth. The specific steps of washing the base cloth are: When passing through the pool, the base cloth is immersed in the pool; the No. 1 pool is salt water, and the No. 2 and No. 3 pools are clear water.

It should be noted that the base cloth impregnated with the slurry is continuously conveyed by setting a power roller device, and the whole device is arranged directly above all the pools, and since the first pool, the second pool, and the third pool are separated from each other , when the base cloth is running under a certain power, the whole is wavy, the base cloth between each two power rollers is in the shape of an arc, the base cloth is located at the bottom of the arc shape and immersed in the pool, The time is determined according to the running speed of the power roller, and the movement mode of the power roller can also adopt regular intermittent motion. The duration of each movement is longer than the static duration, so that the base fabric can be relatively extended in the pool after each change of position. The time of immersion in the medium is increased to improve the removal effect of DMF in the base fabric.

Moreover, because the base cloth is in the shape of an arc, the DMF in the base cloth will gradually gather at the bottom of the arc under the action of gravity due to the existence of the inclined angle of the base cloth immersed in the pool, which is convenient for the solution and DMF in the pool to be sufficient. mix.

Each time the power roller runs, the width of the base fabric immersed in the pool is the same. The width can be controlled by setting the running speed and running time of the power roller. For optimization, the base fabric is immersed in the water surface along the running direction. Symmetrical planes are set symmetrically. The length of the width submerged in the pool is called the lower half arc, and the length of the width exposed on the water surface is called the upper half arc. For example, after each operation, the upper half arc is exposed on the water surface. After that, it will switch to being immersed in the pool, which is the lower half of the arc, so set up, when a lower half of the arc is cleaned in the first pool for the first time, it emerges from the first pool and becomes the upper half of the arc. , and then transformed into the lower half arc section into the second pool for the second cleaning, the same can be obtained, and then the same lower half arc section enters the third pool for the third cleaning. In this way, the entire base fabric is divided into multiple upper or lower arc segments with the same length. DMF in the base fabric can be cleaned when it is in the lower half arc, and can be cleaned in the upper half arc. Under the action of gravity, the DMF in the base fabric is collected in the lower half arc, and all the base fabrics can be fully washed with water for many times, which improves the removal efficiency of DMF in the base fabric.

Moreover, the advantage of this water washing method is that when the base fabric gradually leaves the pool during the running process, since it is about to ascend, the base fabric is inclined at this time, and the water will fall under the action of gravity. Since DMF can dissolve in water, the internal The residual DMF will be separated from the base cloth with the water under the action of gravity, which can better improve the removal effect of DMF in the base cloth.

In summary, reasonable adjustment of the working parameters of the power roller and the running state of the layout base fabric can make the base fabric perform continuous multiple cleanings, and it is precisely because of this that the DMF removal effect of the base fabric is the best.

The fourth step: preheating, ironing, drying, and shaping the base fabric to obtain the bottom embryo, preheating at 140 ° C, ironing the base fabric for 2 minutes, drying the base fabric at a temperature of 140 ° C, and the base fabric The drying time is 6min, the temperature of the shaping base fabric is 140℃, and the time is 7s.

The fifth step: apply the solvent-based biodegradable polyurethane resin to the release paper, and then put the release paper coated with the biodegradable polyurethane resin into the oven to heat to form a film; No. 1 scraper, No. 2 scraper, and No. 3 scraper, the No. 1 scraper, No. 2 scraper, and No. 3 scraper respectively include No. 1 scraper, No. 2 scraper and No. 3 scraper, the No. 1 scraper The distance from the release paper is 8cm, the distance between the No. 2 scraper and the release paper is 2cm, and the distance between the No. 3 scraper and the release paper is 0.4cm. The temperature at which the oven heats the release paper is 140°C.

In the process of use, if the biodegradable polyurethane resin is applied to the release paper in one step, it will easily lead to the formation of air bubbles. , so that the effect of biodegradable polyurethane resin coating on the release paper can be improved to prevent the appearance of air bubbles.

The sixth step: bonding the film and the bottom embryo, and then drying, and drying the film and the bottom embryo at a temperature of 40° C., and finally obtaining a finished product.

To test the surface integrity of semi-finished synthetic leather, method 1: use carbon 12 isotope method to determine the content of organic substances greater than 35%; method 2: use fluorescence spectrometer to determine that the content of heavy metals is lower than the EU standard; method 3: use gas image liquid mass spectrometer Determination of DMF content is lower than the EU standard; Method 4: Use the jungle test method to determine the 14-day aging resistance without damage. Finally, the qualified finished synthetic leather is rolled up.

Example 3:

The preparation steps of the synthetic leather veneer finished product are:

The first step: coating the coating slurry with bio-based degradable polyurethane resin directly on the base cloth; the coating slurry is 70 parts of bio-based degradable polyurethane resin, 40 parts of polyurethane resin, 100 parts of DMF, carboxymethyl fiber 10 parts of plain, 10 parts of ultrafine graphene, 10 parts of ramie fiber powder, 5 parts of calcium gluconate.

The preparation process of the coating slurry is to first add ultrafine graphene, ramie fiber powder, carboxymethyl cellulose, calcium gluconate and DMF into a vacuum stirring tank and stir at 800 r/min for 30 minutes, and then add bio-based degradable materials. Polyurethane resin, biodegradable polyurethane resin was stirred at 1500r/min for 120min, then vacuum defoamed for 120min, and finally filtered with 200 mesh for use to prepare coating slurry.

Bio-based degradable polyurethane resin is bio-based modified polyurethane resin, which is composed of water-based bio-based modified high-solid polyol and bio-based modified isocyanate. The ratio is 2:3.

After fully mixing the water-based bio-based modified high-solids polyol and bio-based modified isocyanate in proportion, they were baked at a temperature of 115° C. for 10 minutes to obtain a bio-based modified polyurethane resin.

The second step: make the bio-based degradable polyurethane resin in the coating slurry solidify on the surface of the base cloth, and the specific step of solidification is to cool both sides of the base cloth for 2 hours at a temperature of 25 ° C. Air-drying solidification process.

The third step: wash the base cloth with clean water, and wash the DMF on the base cloth. The specific steps of washing the base cloth are: When passing through the pool, the base cloth is immersed in the pool; the No. 1 pool is salt water, and the No. 2 and No. 3 pools are clear water.

It should be noted that the base cloth impregnated with the slurry is continuously conveyed by setting a power roller device, and the whole device is arranged directly above all the pools, and since the first pool, the second pool, and the third pool are separated from each other , when the base cloth is running under a certain power, the whole is wavy, the base cloth between each two power rollers is in the shape of an arc, the base cloth is located at the bottom of the arc shape and immersed in the pool, The time is determined according to the running speed of the power roller, and the movement mode of the power roller can also adopt regular intermittent motion. The duration of each movement is longer than the static duration, so that the base fabric can be relatively extended in the pool after each change of position. The time of immersion in the medium is increased to improve the removal effect of DMF in the base fabric.

Moreover, because the base cloth is in the shape of an arc, the DMF in the base cloth will gradually gather at the bottom of the arc under the action of gravity due to the existence of the inclined angle of the base cloth immersed in the pool, which is convenient for the solution and DMF in the pool to be sufficient. mix.

Each time the power roller runs, the width of the base fabric immersed in the pool is the same. The width can be controlled by setting the running speed and running time of the power roller. For optimization, the base fabric is immersed in the water surface along the running direction. Symmetrical planes are set symmetrically. The length of the width submerged in the pool is called the lower half arc, and the length of the width exposed on the water surface is called the upper half arc. For example, after each operation, the upper half arc is exposed on the water surface. After that, it will switch to being immersed in the pool, which is the lower half of the arc, so set up, when a lower half of the arc is cleaned in the first pool for the first time, it emerges from the first pool and becomes the upper half of the arc. , and then transformed into the lower half arc section into the second pool for the second cleaning, the same can be obtained, and then the same lower half arc section enters the third pool for the third cleaning. In this way, the entire base fabric is divided into multiple upper or lower arc segments with the same length. DMF in the base fabric can be cleaned when it is in the lower half arc, and can be cleaned in the upper half arc. Under the action of gravity, the DMF in the base fabric is collected in the lower half arc, and all the base fabrics can be fully washed with water for many times, which improves the removal efficiency of DMF in the base fabric.

Moreover, the advantage of this water washing method is that when the base fabric gradually leaves the pool during the running process, since it is about to ascend, the base fabric is inclined at this time, and the water will fall under the action of gravity. Since DMF can dissolve in water, the internal The residual DMF will be separated from the base cloth with the water under the action of gravity, which can better improve the removal effect of DMF in the base cloth.

In summary, reasonable adjustment of the working parameters of the power roller and the running state of the layout base fabric can make the base fabric perform continuous multiple cleanings, and it is precisely because of this that the DMF removal effect of the base fabric is the best.

The fourth step: preheating, ironing, drying and shaping the base fabric to obtain the bottom embryo, preheating at 160 ° C, ironing the base fabric for 3 minutes, drying the base fabric at a temperature of 160 ° C, and the base fabric The drying time is 8min, the temperature of the shaping base fabric is 160℃, and the time is 9s.

The fifth step: apply the solvent-based biodegradable polyurethane resin to the release paper, and then put the release paper coated with the biodegradable polyurethane resin into the oven to heat to form a film; No. 1 scraper, No. 2 scraper, and No. 3 scraper, the No. 1 scraper, No. 2 scraper, and No. 3 scraper respectively include No. 1 scraper, No. 2 scraper and No. 3 scraper, the No. 1 scraper The distance from the release paper is 7cm, the distance between the second scraper and the release paper is 1cm, and the distance between the third scraper and the release paper is 0.2cm. The temperature at which the oven heats the release paper is 160°C.

In the process of use, if the biodegradable polyurethane resin is applied to the release paper in one step, it will easily lead to the formation of air bubbles. , so that the effect of biodegradable polyurethane resin coating on the release paper can be improved to prevent the appearance of air bubbles.

The sixth step: bonding the film and the bottom embryo, and then drying, and drying the film and the bottom embryo at a temperature of 50° C., and finally obtaining a finished product.

To test the surface integrity of semi-finished synthetic leather, method 1: use carbon 12 isotope method to determine the content of organic substances greater than 35%; method 2: use fluorescence spectrometer to determine that the content of heavy metals is lower than the EU standard; method 3: use gas image liquid mass spectrometer Determination of DMF content is lower than the EU standard; Method 4: Use the jungle test method to determine the 14-day aging resistance without damage. Finally, the qualified finished synthetic leather is rolled up.

The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore: all equivalent changes made according to the structure, shape and principle of the present application should be covered within the scope of the present application. Inside.

Claims (9)

1. a bio-based degradable penetrating spunlace cloth polyurethane synthetic leather veneer finished product, is characterized in that: the base cloth of described finished product selects the spunlace non-woven fabric of viscose and nylon blended; The preparation steps of the synthetic leather veneer product are as follows: the first step is to directly coat the coating slurry with the bio-based degradable polyurethane resin on the base cloth; the second step is to solidify, so that the biological The base degradable polyurethane resin is solidified on the surface of the base cloth; the third step is to wash the base cloth with water to wash the DMF on the base cloth; the fourth step is to preheat, iron, dry and shape at 120-160 ° C The bottom embryo is described; the fifth step is to coat and scrape the solvent-based biodegradable polyurethane resin on the release paper, and then put the release paper coated with the biodegradable polyurethane resin into the oven to heat to form a film; The film is attached to the bottom embryo, and then dried to obtain a finished product. The coating slurry is 60-70 parts of biodegradable polyurethane resin, 30-40 parts of polyurethane resin, 100 parts of DMF, 5-10 parts of carboxymethyl cellulose, 5-10 parts of ultrafine graphene, 5-10 parts of ramie fiber powder 10 servings, calcium gluconate 2-5 servings. 2. a kind of bio-based degradable penetrating spunlace cloth polyurethane synthetic leather veneer finished product according to claim 1, is characterized in that: the preparation process of described coating slurry is to first superfine graphene, ramie fiber powder , carboxymethyl cellulose, calcium gluconate and DMF were added to the vacuum stirring tank at 500-800r/min and stirred for 30min, then bio-based degradable polyurethane resin was added, and the bio-based degradable polyurethane resin was stirred at 1000-1500r/min for 60- 120min, followed by vacuum defoaming for 60-120min, and finally filtered with 180-200 mesh for use to prepare a coating slurry. 3. a kind of bio-based degradable permeable spunlace cloth polyurethane synthetic leather veneer product according to claim 1, is characterized in that: in the second step, the concrete step of solidification is the condition that the temperature is 20-25 ℃ Next, the cold air drying and solidification process is performed on both sides of the base fabric for 1-2 hours. 4. a kind of bio-based degradable permeable spunlace cloth polyurethane synthetic leather veneer finished product according to claim 1, is characterized in that: in the 3rd step, the concrete step of washing the base cloth is that the base cloth takes 0.5m/s The movement speed of the machine passes through the No. 1 pool, the No. 2 pool, and the No. 3 pool in turn. When passing through the pool, the base cloth is immersed in the pool; the No. 1 pool is salt water, and the No. 2 and No. 3 pools are clear water. 5. a kind of bio-based degradable penetrating spunlace cloth polyurethane synthetic leather veneer finished product according to claim 1 is characterized in that: in the 4th step, the time for ironing the base cloth is 1-3min, and the drying base The temperature of the cloth is 120-160°C, the drying time of the base fabric is 4-8min, the temperature of the shaping base fabric is 120°C-160°C, and the time is 5-9s. 6. a kind of bio-based degradable permeable spunlace cloth polyurethane synthetic leather veneer product according to claim 1, is characterized in that: in the 5th step, described release paper passes through No. 1 scraper, No. 2 scraper successively Scraper and Scraper No. 3, the Scraper No. 1, Scraper No. 2 and Scraper No. 3 respectively include Scraper No. 1, Scraper No. 2 and Scraper No. 3, and Scraper No. 1 is farther away from the release paper. The distance is 7-9cm, the distance between the No. 2 scraper and the release paper is 1-3cm, and the distance between the No. 3 scraper and the release paper is 0.2-0.6cm. 7. A bio-based degradable penetrating spunlace polyurethane synthetic leather veneer product according to claim 1, characterized in that: in the fifth step, the temperature at which the oven heats the release paper is 120-160° C. . 8. a kind of bio-based degradable permeable spunlace cloth polyurethane synthetic leather veneer product according to claim 1, is characterized in that: in the 6th step, the temperature of the described film and the bottom embryo to be dried and attached is 30-50℃. 9 . The bio-based degradable spunlace cloth polyurethane synthetic leather veneer product according to claim 1 , wherein the ratio of viscose and nylon blended in the spunlace non-woven fabric is 1:1. 10 .