CN103255639A - A kind of environment-friendly polyurethane leather, preparation method and product thereof - Google Patents

Abstract

An environmentally friendly polyurethane leather comprises a microfiber non-woven fabric, a bottom layer covering the non-woven fabric, a surface layer covering the bottom layer, a polyvinyl chloride foaming layer, and a water-based adhesive layer. After the semi-polyurethane leather semi-finished product is foamed and embossed, a three-plate surface treatment machine is used for surface treatment. The sizing amount of the water-based surface treatment agent is 40-60g/ ^m2 , and the drying temperature and time are 140-150°C and 60-90s respectively. The leather blank after surface treatment is kneaded, dried, and measured to obtain a finished product. The surface layer comprises 4 coating layers, namely: an adhesive layer, a first intermediate layer, a second intermediate layer, and a surface layer. The environmentally friendly polyurethane leather is widely used in shoes, sofas, clothing leather, luggage leather, and furniture and interior decoration leather.

Description

A kind of environment-friendly polyurethane leather, preparation method and product thereof

technical field

The invention relates to the field of artificial leather, in particular to an environment-friendly polyurethane leather, a preparation method and a product thereof.

Background technique

With the development of society and the improvement of human living standards, the requirements for consumer goods are getting higher and higher, and natural leather is one of the hot consumer goods. Due to the constraints of natural conditions and the increasing awareness of animal protection in countries around the world, natural leather is decreasing year by year. In order to replace this natural leather, synthetic leather was invented. the

my country is the world's largest producer and consumer of polyvinyl chloride (PVC) artificial leather, and its production capacity and output account for 73% and 69% of the world's total respectively. Semi-PU leather is an upgraded product of PVC leather. It is characterized by PU on the surface and PVC on the bottom. It not only has the good feel, appearance, breathability, moisture permeability and easy surface treatment of PU leather, but also has the durability and low price of PVC leather. Advantages, strong market competitiveness, has been widely used in the production of luggage, clothing, footwear, furniture, sporting goods and other fields, accounting for 30-40% of the production of artificial leather. the

However, the artificial leather and semi-PU leather industries are also facing severe challenges of environmental pollution. The exhaust gas pollutants in artificial leather and semi-PU leather production lines mainly come from the disorderly discharge of organic solvents in solvent-based surface treatments, surface layer resins, and adhesives. These solvents include dimethylformamide (DMF), toluene, Ethyl acetate, butyl acetate, butanone and methylal, etc. According to calculations, every one and a half PU leather production lines emits 10.2 tons of DMF, 50.8 tons of toluene, 50.80 tons of butanone, 1.32 tons of DOP and 24.5 tons of acetate solvents per year. Therefore, the artificial leather industry has long faced the challenges of high environmental governance costs, serious waste of resources, and severe environmental pollution. How to develop water-based slurries to replace traditional solvent-based slurries is the key to maintaining the sustainable development of the artificial leather industry. the

At present, in the production method of artificial leather, coating method (comprising direct coating method and transfer coating method) is the main manufacturing method of artificial leather. In the manufacturing process of coated PVC leather, solvent-based surface resin, solvent-based surface layer resin and solvent adhesive (glue content 25-30%, 70-75% organic solvent) are required. Brightening, extinction and various effect functions, the dosage is about 40-60g/m ² ; the surface layer resin mainly provides the surface layer of semi-PU leather, the dosage is about 60-80g/m ² ; the adhesive glue is used to bond the PVC film and the base Cloth (calendering method is generally not required), the dosage is about 80-100g/m ² . Traditional surface resins, surface resins and adhesives are mainly solvent-based PU or acrylic. Organic solvents are flammable, explosive, smelly, and toxic, which not only poses safety hazards, but also endangers the physical and mental health of workers.

In recent years, with the improvement of people's living standards, people have put forward higher requirements for the ecology of leather products. In Europe and the United States, the requirements of zero formaldehyde, zero azo, and zero heavy metals have been put forward for artificial leather and semi-PU leather, especially home interior leather, automotive interior leather, clothing leather, and furniture leather. At the same time, VOC (volatile organic solvents) are required Content) ≤ 5mmg/Kg (leather). Therefore, the traditional semi-PU leather manufacturing method based on solvent resin cannot meet the requirements of eco-friendly tanning. the

Contents of the invention

In view of this, the technical problem solved by the present invention is to provide an environmentally friendly polyurethane leather that eliminates organic solvent pollution from the source, saves organic solvent resources, eliminates potential safety hazards, improves the working environment, and improves the ecological level of semi-PU leather and the international market. Competitiveness.

The object of the present invention is achieved by the following technical measures, wherein the parts of raw materials are parts by weight unless otherwise specified.

A kind of environment-friendly polyurethane leather, comprises microfiber non-woven fabric, the bottom layer that covers on described non-woven fabric, and the surface layer that covers on described bottom layer, polyvinyl chloride foam layer, water-based adhesive layer, it is characterized in that : After foaming and embossing the semi-finished polyurethane leather semi-finished product, use a three-version surface treatment machine for surface treatment. The sizing amount of the water-based surface treatment agent is 40-60g/m ² , and the drying temperature and time are 140-150°C, 60-90s , the leather base after the surface treatment gets the finished product after kneading, drying, and measuring. The surface layer includes 4 layers of coatings, which are respectively:

The bonding layer is covered on the bottom layer, and the slurry of the bonding layer includes the following raw materials in parts by weight:

80-100 parts of the first water-based polyurethane resin, 10-20 parts of water, 0-5 parts of water-based additives;

The first intermediate layer is covered on the adhesive layer, and the slurry of the first intermediate layer includes the following raw materials in parts by weight:

80-100 parts of the second water-based polyurethane resin, 20-30 parts of water, 0-5 parts of water-based additives;

The second intermediate layer is covered on the first intermediate layer, and the slurry of the second intermediate layer includes the following raw materials in parts by weight:

80-100 parts of the third water-based polyurethane resin, 20-30 parts of water, 0-5 parts of water-based additives;

A surface layer is covered on the second middle layer, and the slurry of the surface layer includes the following raw materials in parts by weight;

80-100 parts of the fourth water-based polyurethane resin, 30-40 parts of water, 0-5 parts of water-based additives;

The polyvinyl chloride foam layer slurry includes the following raw materials in parts by weight:

Mix 10-20 parts of dioctyl phthalate, 100 parts of polyvinyl chloride powder, 2-5 parts of toner, 5-15 parts of azodicarbonamide foaming agent, and 2-4 parts of stearate , made into foam layer slurry

The polyvinyl chloride foam layer slurry includes the following raw materials in parts by weight:

Described aqueous bonding layer comprises following raw material by weight:

Mix 100 parts of water-based adhesive, 0.5-0.8 parts of water-based thickener, and 0.2-0.4 parts of water-based leveling agent to prepare a water-based adhesive with a viscosity of 4500-5000 mPa.s;

Described water-based surface treatment agent comprises following raw material by weight part:

Mix 100 parts of water-based polyurethane varnish, 0.5-0.8 parts of water-based thickener, 0.2-0.4 parts of water-based leveling agent, 2-5 parts of water-based cross-linking agent, and 2-5 parts of hand feeling improver, and mix well to make a viscosity of 1000 ~1500mPa.s water-based surface treatment agent.

The first water-based polyurethane resin is a polyurethane resin with a modulus of 25-35 kg/cm ² and a molecular weight of 0.5×10 ⁵ -0.6×10 ⁵ Mr; the second water-based polyurethane resin has a modulus of 55-65 kg/cm ^2. A polyurethane resin with a molecular weight of 0.6×10 ⁵ -0.7×10 ⁵ ; the third waterborne polyurethane resin is a polyurethane resin with a modulus of 55-65 kg/cm ² and a molecular weight of 0.6×10 ⁵ -0.7×10 ⁵ ; The fourth waterborne polyurethane resin is a polyurethane resin with a modulus of 65-75 kg/cm ² and a molecular weight of 0.7×10 ⁵ -0.8×10 ⁵ .

The water-based auxiliary agent is one or more of water-based thickeners, water-based leveling agents, and water-based defoamers.

The adhesive is any one of diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate or dicyclohexylmethane diisocyanate waterborne polyurethane with excellent water resistance and solvent resistance.

The water-based crosslinking agent is any one of polycarbodiimide, polyethylenimine, epoxy resin or blocked water-based polyurethane.

The foaming is to put the semi-finished product into an oven for foaming. The temperature range is divided into three sections, the front section is 180°C-185°C, the middle section is 190°C-195°C, and the rear section is 200°C-210°C. The foaming time is 120-150s.

The present invention has the following advantages:

The semi-polyurethane leather produced by the invention is soft, comfortable, air-permeable and moisture-permeable, the VOC content in the product leather is lower than 5mmg/kg, and other performances are all up to or better than the industry standard. the

The use of water-based materials instead of solvent-based materials eliminates environmental pollution caused by organic solvents from the source, saves a lot of organic solvent resources, eliminates fire hazards, significantly improves the working environment of laborers, and is conducive to the sustainable development of the industry. the

Water-based materials replace solvent-based materials, which meet the requirements of the European Union for ecological semi-PU leather, and improve the ecological grade and international market competitiveness of semi-PU leather products. the

specific implementation plan

The present invention is specifically described below by way of examples. It is necessary to point out that this embodiment is only used to further illustrate the present invention, and should not be construed as limiting the protection scope of the present invention. Those skilled in the art can make some non-essential improvements and adjustments according to the content of the above invention.

Example 1

In a typical embodiment of the present invention, a kind of environment-friendly polyurethane leather comprises microfiber non-woven fabric, the bottom layer covered on the non-woven fabric, and the surface layer covered on the bottom layer, wherein, the surface layer includes at least 4 layers A coating formed by squeegeeing of slurry, each slurry includes: water-based polyurethane, water, and water-based additives.

Preferably, in the above-mentioned ultrafiber environment-friendly water-based synthetic leather, the surface layer includes 4 layers of coatings, which are respectively: an adhesive layer, a first middle layer, a second middle layer and a surface layer. The adhesive layer is covered on the bottom layer, and the slurry of the adhesive layer includes the following raw materials in parts by weight: 80-100 parts of the first water-based polyurethane resin, 10-20 parts of water, 0-5 parts of water-based additives; the first intermediate layer Covering on the bonding layer, the slurry of the first middle layer includes the following raw materials by weight: 80-100 parts of the second water-based polyurethane resin, 20-30 parts of water, 0-5 parts of water-based additives; the second middle layer Covering on the top of the first intermediate layer, the slurry of the second intermediate layer includes the following raw materials in parts by weight: 80-100 parts of the third water-based polyurethane resin, 20-30 parts of water, 0-5 parts of water-based additives; the surface layer covers On the second intermediate layer, the slurry of the surface layer includes the following raw materials by weight: 80-100 parts of the fourth water-based polyurethane resin, 30-40 parts of water, and 0-5 parts of water-based additives. Preferably, the viscosity of the adhesive layer slurry in the above-mentioned ultrafiber environment-friendly water-based synthetic leather is 5000-5500CPS; the viscosity of the first intermediate layer slurry is 3000-3500CPS; the viscosity of the second intermediate layer slurry is 2000-2500CPS; the surface The viscosity of the layer slurry is 1000-1500CPS. the

Preferably, the above-mentioned water-based additives are one or more of water-based thickeners, water-based leveling agents, and water-based defoamers. The choice of raw materials and dosage of the water-based thickener, water-based leveling agent, and/or water-based defoamer can be obtained by those skilled in the art through reasonable analysis, and will not be described in detail here. the

Preferably, the dry veneer in the above preparation method further includes the following steps: the preparation of the surface layer includes the following steps: After the fourth water-based polyurethane resin is stirred at high speed for 30-60 minutes, at a temperature of 50-70 ° C, add a water-based auxiliary After stirring for another 15-20 minutes, add water to adjust the surface layer slurry with a viscosity of 1000-1500CPS, apply the surface layer slurry on the carrier surface without gaps, form a coating of 1-2 wires, dry, and form The surface layer; the preparation of the second intermediate layer comprises the following steps: after stirring the third water-based polyurethane resin at high speed for 30-60 minutes, at a temperature of 50-70°C, adding water-based additives, stirring for 15-20 minutes, adding water Prepare the second middle layer slurry with a viscosity of 2000-2500CPS, apply the second middle layer slurry on the surface layer to form a coating of 8-12 filaments, and dry to form the second middle layer; the first middle layer The preparation includes the following steps: after stirring the second water-based polyurethane resin at high speed for 30-60 minutes, at a temperature of 50-70°C, adding water-based additives, stirring for 15-20 minutes, adding water to adjust the viscosity to 3000-3500CPS The first intermediate layer slurry is coated and scraped on the second intermediate layer by the first intermediate layer slurry to form a coating of 8-12 wires, and dried to form the first intermediate layer; the preparation of the bonding layer includes the following steps : After stirring the first water-based polyurethane resin at a high speed for 30-60 minutes, add water-based additives at a temperature of 50-70°C, and stir for 15-20 minutes, then add water to prepare a slurry with a viscosity of 5000-5500CPS. The knot layer slurry is applied and scraped on the middle layer to form a bonding layer of 8-12 filaments. the

In the present invention, if the added water-based additives include water-based leveling agent, water-based thickener and water-based defoamer, first add the water-based leveling agent and water-based thickener at the same time, after stirring for 15-20 minutes, add the water-based Defoamer, stir at high speed for 2-3 minutes, stand still for 10-15 minutes, so as to reduce the air bubbles in the slurry and enhance the strength of the prepared coating. the

In the present invention, the above-mentioned layers of slurry can also be filtered after being prepared, and can be filtered for 2-3 times by using a 200-mesh filter screen, so that the particles in the slurry are fine and uniform, and the hand feeling of the prepared synthetic leather is enhanced. the

By adopting this preparation method, various slurries are mixed evenly, and the resulting coating has good strength, which is beneficial to the preparation of high-quality synthetic leather. the

Preferably, the above-mentioned dry veneer further includes the following steps: in the preparation process of the surface layer, the step of drying further includes: running the carrier surface coated with the surface layer slurry at a speed of 8-9m/min, passing through 65-75°C, 75-85°C temperature section, preferably 70°C, 80°C temperature section for gradual heating and drying, the length of each temperature section is 3m, and the fan speed is 300 rpm; the preparation of the second intermediate layer In the process, the step of drying further includes: running the carrier surface coated with the second intermediate layer slurry at a speed of 8-9m/min, and passing through 65-75°C, 70-80°C, 75-85°C, 80-90°C temperature section, preferably 70°C, 75°C, 80°C, 85°C temperature section for gradual heating and drying, the length of each temperature section is 4m, and the fan speed is 400 rpm; the first middle layer In the preparation process, the step of drying further includes: running the scraper from the carrier surface of the first intermediate layer slurry at a speed of 8-9m/min, and passing through 70-80°C, 75-85°C, 80-90°C respectively , 85-95°C, preferably 75°C, 80°C, 85°C, and 90°C temperature sections for gradual heating and drying, the length of each temperature section is 4m, and the fan speed is 500 rpm;

This method of gradually raising the temperature and drying is conducive to gradually forming a film of the water-based polyurethane resin that is not easy to form a film, and each layer of coating has good film-forming properties, which is more conducive to the preparation of high-quality synthetic leather. Moreover, these temperature requirements are within the reach of existing synthetic leather production equipment, and the existing synthetic leather production equipment can be used to directly produce this water-based synthetic leather, reducing equipment costs. the

Example 2

Preparation of water-based polyurethane surface layer slurry

Use 100 parts of polyurethane for the water-based surface layer with a modulus of 30, 20 parts of water-based black color paste, 0.2 parts of water-based leveling agent Silok Leveling8255, 0.1 part of water-based defoamer Foamex800, and 0.3 parts of water-based thickener COSIE FT-835 , The polycarbodiimide cross-linking agent is mixed evenly in 2 parts, and the surface layer slurry with a viscosity of 2500mPa.s (temperature 25°C, the same below) is prepared, and filtered for later use;

Preparation of PVC foam layer slurry

Mix 20 parts of dioctyl phthalate, 100 parts of polyvinyl chloride powder, 5 parts of toner, 15 parts of azodicarbonamide (AC) foaming agent, and 4 parts of stearate to form a foam layer slurry;

Preparation of water-based adhesive

Mix 100 parts of water-based polyurethane adhesive, 0.5 part of water-based thickener COSIE FT-835, and 0.2 part of leveling agent Silok Leveling8255 to prepare a water-based adhesive with a viscosity of 5000mPa.s;

Preparation of water-based surface treatment agent

Mix 100 parts of water-based polyurethane varnish with a modulus of 60MPa, 0.5 parts of water-based thickener COSIE FT-835, 0.2 parts of water-based leveling agent Silok Leveling8255, 2.5 parts of water-based polyaziridine crosslinking agent, p-aminobenzene 5 parts of n-propyl formate feel agent, made into a water-based surface treatment agent with a viscosity of 1200mPa.s, filtered for standby;

Manufacture of semi-PU leather crust

Scratch surface

Using the direct coating method, apply the water-based polyurethane surface layer slurry on the release paper, control the thickness of the coating to 0.07mm, and then put it in an oven to dry. The temperature range and drying time of the oven are respectively set to 90°C, 60s; 120°C ,30s;

Scratch PVC foam layer

Scrape the PVC foam layer slurry on the surface layer, control the thickness of the coating at 0.14mm, and then put it into the oven for plasticization. The temperature range and plasticization time of the oven are set to 150°C, and the plasticization time is 60s;

Scratch adhesive layer

Apply scraping adhesive on the foam layer, the thickness of the adhesive layer is controlled to 0.07mm, enter the oven, bake at 110°C for 90s until semi-dry, and then attach it to the base cloth, and separate the paper and leather;

Foaming

Put the above semi-finished product into the oven for foaming. The temperature range is divided into three sections, the front section is 180°C, the middle section is 190°C, and the rear section is 210°C. The foaming time is 120s. the

The foamed semi-finished product is embossed according to the conventional process, and then the three-plate surface treatment machine is used for surface treatment. The sizing amount of the surface treatment agent is controlled at 40g/m ² , and the drying temperature and time are respectively 140°C and 90s. The final leather blank is finished by conventional kneading, drying and measuring.

Claims (9)

1. an environment-friendly polyurethane is removed from office, comprise super fine nonwoven fabric, cover the bottom on the described nonwoven fabric, and cover surface layer, foam polyvinyl chloride layer, water-based adhesive linkage on the described bottom, it is characterized in that: after the half polyurethane leather semi-finished product foaming embossing, adopt three editions table place machines to carry out surface treatment, the starching amount of water-based table place's agent is 40～60g/m ², baking temperature and time are respectively 140～150 ℃, 60～90s, and the leather base behind the table place gets product after rubbing line, drying, gage, comprises 4 layers of coating in the described surface layer, is respectively:

Tack coat, cover described bottom above, the slurry of described tack coat comprises following raw material by weight:

First waterborne polyurethane resin 80-100 part, water 10-20 part, aqueous promoter 0-5 part;

First intermediate layer, cover described tack coat above, the slurry in described first intermediate layer comprises following raw material by weight:

Second waterborne polyurethane resin 80-100 part, water 20-30 part, aqueous promoter 0-5 part;

Second intermediate layer, cover described first intermediate layer above, the slurry in described second intermediate layer comprises following raw material by weight:

The 3rd waterborne polyurethane resin 80-100 part, water 20-30 part, aqueous promoter 0-5 part;

Superficial layer, cover described second intermediate layer above, the slurry of described superficial layer comprises following raw material by weight;

The 4th waterborne polyurethane resin 80-100 part, water 30-40 part, aqueous promoter 0-5 part;

Described foam polyvinyl chloride layer slurry comprises following raw material by weight:

10～20 parts of dioctyl phthalates, 100 parts in polyvinyl chloride powder, 2～5 parts of toners, 5～15 parts of azodicarbonamide foaming agents, stearate are mixed for 2～4 parts, be made into the foaming layer slurry

Described foam polyvinyl chloride layer slurry comprises following raw material by weight:

Described water-based adhesive linkage comprises following raw material by weight:

100 parts of aqueous adhesives, water-based thickener are mixed for 0.5～0.8 part, and 0.2～0.4 part of water-based levelling agent is made into the aqueous adhesive that viscosity is 4500～5000mPa.s;

Described water-based table place's agent comprises following raw material by weight:

With 100 parts of aqueous polyurethane gloss oil, 0.5～0.8 part of water-based thickener, 0.2～0.4 part of water-based levelling agent, 2～5 parts of water cross-linking agents, the feel modifying agent mixes for 2～5 parts, and being made into viscosity is water-based table place's agent of 1000～1500mPa.s.

2. a kind of environment-friendly polyurethane according to claim 1 is removed from office, and it is characterized in that: described first waterborne polyurethane resin is that modulus is 25-35kg/cm ², molecular weight is 0.5 * 10 ⁵-0.6 * 10 ⁵The polyurethane resin of Mr; Described second waterborne polyurethane resin is that modulus is 55-65kg/cm ², molecular weight is 0.6 * 10 ⁵-0.7 * 10 ⁵Polyurethane resin; Described the 3rd waterborne polyurethane resin is that modulus is 55-65kg/cm ², molecular weight is 0.6 * 10 ⁵-0.7 * 10 ⁵Polyurethane resin; Described the 4th waterborne polyurethane resin is that modulus is 65-75kg/cm ², molecular weight 0.7 * 10 ⁵-0.8 * 10 ⁵Polyurethane resin.

3. a kind of environment-friendly polyurethane according to claim 1 is removed from office, and it is characterized in that: described aqueous promoter is one or more in water-based thickener, water-based levelling agent, the water-based defoamer.

4. a kind of environment-friendly polyurethane leather according to claim 1 is characterized in that: adhesive is any in water-fast, that solvent resistance is good methyl diphenylene diisocyanate, toluene di-isocyanate(TDI), isophorone diisocyanate or the dicyclohexyl methyl hydride diisocyanate type aqueous polyurethane.

5. a kind of environment-friendly polyurethane according to claim 1 is removed from office, and it is characterized in that: water cross-linking agent is any in polycarbodiimide, polyaziridine, epoxy resin or the end-sealed type water-based polyurethane.

6. a kind of environment-friendly polyurethane according to claim 1 is removed from office, and it is characterized in that: described foaming is for putting into semi-finished product the baking oven foaming, and temperature range is divided into three sections, 180 ℃～185 ℃ of leading portions, 190 ℃～195 ℃ in stage casing, 200 ℃～210 ℃ of back segments, foamed time is 120～150s.

7. a kind of environment-friendly polyurethane leather according to claim 1 is used for dressing leather aspect in clothing leather, luggage leather, upper leather, sofa artificial leather or the house ornamentation.

8. one kind prepares the method that a kind of environment-friendly polyurethane as claimed in claim 1 is removed from office, it is characterized in that preparation process is: with 100 parts of polyurethane of water-based surface layer, 20 parts of the aqueous black mill bases of modulus 30, water-based levelling agent Silok Leveling8255,0.2 part, water-based defoamer Foamex800,0.1 part, water-based thickener COSIE FT-835,0.3 part, polycarbodiimide crosslinkers mix by 2 parts, being made into viscosity is the 2500mPa. surface layer slurry, filters standby; 20 parts of dioctyl phthalates, 100 parts in polyvinyl chloride powder, 5 parts of toners, 15 parts of Celogen Az (AC) blowing agents, stearate are mixed for 4 parts, be made into the foaming layer slurry; With 100 parts of aqueous polyurethane adhesives, water-based thickener COSIE FT-835,0.5 part mixes, and levelling agent Silok Leveling8255, is made into the aqueous adhesive that viscosity is 5000mPa.s by 0.2 part; 100 parts of aqueous polyurethane gloss oil, water-based thickener COSIE FT-835 with modulus 60MPa, 0.5 part mixes, water-based levelling agent Silok Leveling8255,0.2 part, 2.5 parts of water-based polyaziridine crosslinking agents, 5 parts of p-aminobenzoic acid n-propyl hand feeling agents, being made into viscosity is the place's agent of 1200mPa.s water-based table, filters standby; Adopt straight coating method, the aqueous polyurethane surface layer slurry is coated with scrapes on release liners, coating layer thickness control 0.07mm, it is dry to put into baking oven then, and oven temperature is interval and be set to 90 ℃ drying time respectively, 60s; 120 ℃, 30s; Be coated with on the surface layer basis and scrape PVC foaming layer slurry, coating layer thickness is controlled at 0.14mm, puts into baking oven then and plastifies, and the interval and fusion time setting of oven temperature is respectively 150 ℃, fusion time 60s; Be coated with in foaming layer and scrape bonded adhesives, thickness of adhibited layer control 0.07mm enters baking oven,, fits with base cloth then to half-dried in 110 ℃ of bakings of temperature 90s, and paper, leather separate; Above-mentioned semi-finished product are put into the baking oven foaming, and temperature range is divided into three sections, 180 ℃ of leading portions, 190 ℃ in stage casing, 210 ℃ of back segments, foamed time are 120s, by through conventional technology embossing, adopt three editions table place machines to show the place then the semi-finished product after the foaming, the starching amount control of table place agent is at 40g/m ², baking temperature and time are respectively 140 ℃, 90s, and the leather base behind the table place gets product after routine is rubbed line, drying, gage.

9. the application of environment-friendly polyurethane leather as claimed in claim 1 on footwear, sofa, clothing leather, luggage leather and furniture and indoor decoration leather.