CN103696274A - Method for manufacturing foamed synthetic leather based on water-based resin and TPU (Thermoplastic Polyurethane) resin - Google Patents

Method for manufacturing foamed synthetic leather based on water-based resin and TPU (Thermoplastic Polyurethane) resin Download PDF

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CN103696274A
CN103696274A CN201310734113.XA CN201310734113A CN103696274A CN 103696274 A CN103696274 A CN 103696274A CN 201310734113 A CN201310734113 A CN 201310734113A CN 103696274 A CN103696274 A CN 103696274A
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water
resin
layer
foaming
tpu
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CN201310734113.XA
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CN103696274B (en
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范浩军
陈意
宁继鑫
刘世勇
王伟
廖学品
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四川大学
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Abstract

The invention discloses a method for manufacturing foamed synthetic leather based on water-based resin and TPU (Thermoplastic Polyurethane) resin. The manufacturing method comprises the following steps: using water-based polyurethane as a facial layer and a surface treatment layer, using TPU resin as a foaming layer, using a water-based cement as a bonding layer, and obtaining the environment-friendly foamed synthetic leather through a coating transfer process. The method has the advantages that organic pollutants are thoroughly eliminated from the source, organic solvent resources are saved, potential safety hazard is eliminated, and the work environment of workers is improved. The VOC (volatile organic compound) content of a finished leather product is lower than 5 mg/kg. The foamed synthetic leather is ecological environmental friendly and meets European ecological foamed synthetic leather requirements, and the other properties of the leather can also reach or superior to the properties of solvent products.

Description

A kind of foaming synthetic leather manufacture method based on water-base resin and TPU resin

Technical field

The invention belongs to synthetic leather and manufacture field, specifically refer to a kind of eco-friendly foaming synthetic leather manufacture method, refer to especially the foaming synthetic leather manufacture method based on water-base resin and TPU resin.

Background technology

China is world's artificial leather, synthetic leather production and consumption big country, and its production capacity and output account for respectively 73% and 69% of the world.But synthetic leather industry is also faced with the severe challenge of environmental pollution.Exhaust emission on synthetic leather leather production line mainly comes from the unordered discharge of the organic solvent in the place's agent of solvent-borne type table, surface layer resin, foaming layer resin and bonded adhesives, and these solvents have dimethyl formamide (DMF), toluene, ethyl acetate, butyl acetate, butanone and dimethoxym ethane etc.According to measuring and calculating, every 1 foaming synthetic leather production line, discharges 10.2 tons of DMF every year, discharges every year 50.8 tons of toluene, discharges every year 50.80 tons of butanone, 24.5 tons of acetate esters solvents.These organic solvents are inflammable and explosive, smell is large, toxicity is large, both had potential safety hazard, endanger again employed's physical and mental health.Therefore, synthetic leather industry is faced with that environmental improvement cost is high for a long time, the severe challenge of serious waste of resources, environmental pollution, and therefore develop water-base resin and substitute traditional solvent type resin, be the key of maintaining the sustainable development of synthetic leather industry.

In current synthetic leather manufacture method, dry method is the main manufacture methods of synthetic leather, and in dry process, foaming is again key problem in technology.Foaming synthetic leather is leather because its good fullness, feel, outward appearance, ventilative, poisture-penetrability have been widely used in fields such as producing case and bag, sofa, footwear, furniture, floor, sports goods, has accounted for 30 above % of synthetic leather output.

In current foaming technique, there are chemical blowing, hollow microsphere foaming and physical foaming technology can supply to select.In traditional handicraft, chemical foaming agent mostly is organic matter class as AC blowing agent, good with oleoresin compatibility, uniform in foaming, its technology maturation; But these organic foaming agents are conventionally water insoluble, poor with water-base resin compatibility, cannot obtain uniform intumescent coating; Also someone attempts to adopt inorganic salts blowing agent, but it is residual in coating, to have inorganic salts, affects the performance such as water-fast, electric insulation of finished leather; In hollow microsphere foaming technique, hollow microsphere powder is expensive, and cost is high, cannot extensively promote; Physical foaming technology also claims mechanical foaming technology, within 1993, has the companies such as Japanese DIC, Dutch Stahl in leather manufacture, to use mechanical foaming technology, is mainly used in cow split or the manufacture of the leather of having a shave, but the application that do not put it over so far.At synthetic leather, manufacture field, a large amount of perspective work has been done by Beyer Co., Ltd, attempt to adopt water-base resin and mechanical foaming technology to produce synthetic leather, and set up 2 dry process production lines in the Five continents, Zhejiang Industrial Co., Ltd., Zhejiang Fang Yuan artificial leather Co., Ltd, but first mechanical foaming technology needs high sticky, the high solid water based polyurethane (solid content >=50%) of expensive aliphatic; In addition, the uniformity of abscess after physical blowing, expansion ratio are unstable, the raising of also still needing of decorative pattern guarantor type, the constancy of synthetic leather coating after water is rubbed, so physical foaming technology is not widely applied so far yet.

In recent years, along with the raising of people's living standard, people have higher requirement to the ecological property of leather goods.America and Europe, to artificial leather, synthetic leather, particularly house ornamentation interior decoration leather, interior leather for automobiles, clothing leather, furniture leather, upper leather etc. have proposed the requirement of zero formaldehyde, zero azo, zero heavy metal, require VOC(volatile organic solvent content simultaneously)≤5mmg/Kg (leather).Therefore, traditional foaming synthetic leather manufacturing technology based on Solvent Resin is to meet ecological synthetic leather requirement.

Summary of the invention

The object of the invention is the shortcoming and defect existing in order to overcome prior art, and provide a kind of foaming synthetic leather manufacture method based on water-base resin and TPU resin, the method is eliminated organic solvent pollution from source, save organic solvent resource, eliminate safe hidden trouble, improve employed's working environment, promoted ecological grades and the competitiveness in the international market of synthetic leather.

For achieving the above object, technical scheme of the present invention is to comprise the following steps:

(1) preparation of aqueous polyurethane table place layer resin, surface layer resin, TPU foaming layer resin and water-based bonded adhesives, in this step, each operation is in no particular order;

(1.1) preparation of aqueous polyurethane surface layer resin, in parts by weight:

By 100 parts of polyurethane, water-based levelling agent 0.2-0.5 part, aqueous color paste 20-30 part for water-based surface layer, water-based defoamer 0.1-0.3 part, water-based thickener 0.3-0.5 part, crosslinking agent mix by 2-5 part, and being at room temperature made into viscosity is the aqueous polyurethane surface layer resin of 2500-3000 mPa.s;

(1.2) preparation of TPU foaming layer resin

TPU resin, toner, blowing agent, foam stabilizer, heat stabilizer are mixed, and heating and melting, is configured to TPU foaming layer resin;

(1.3) preparation of water-based bonded adhesives, in parts by weight:

100 parts of the bonded adhesives of water-based, water-based thickener 0.5-0.8 part are mixed, levelling agent 0.2-0.4 part, being at room temperature made into viscosity is the water-based bonded adhesives of 4500-5000 mPa.s;

(1.4) preparation of water-based table place layer resin, in parts by weight:

100 parts of aqueous polyurethane gloss oil, water-based thickener 0.5-0.8 part are mixed, water-based levelling agent 0.2-0.4 part, water cross-linking agent 2-5 part, feel modifying agent 2-5 part, being at room temperature made into viscosity is the water-based table place layer resin of 1000-1500 mPa.s;

(2) manufacture of foaming synthetic leather crust leather: adopt three to be coated with four baking techniques, carry out successively following operation: release liners put, roll up be coated with scrape surface layer, dry, cooling, be coated with TPU foaming layer, dry, cooling, be coated with adhesive linkage, be dried to leather hard, base cloth laminating, foaming, coolingly remove from office separated, rolling with paper, concrete technology parameter is:

(2.1) be coated with and scrape surface layer

Adopt straight coating method, aqueous polyurethane surface layer resin is coated with and is scraped in release liners, coating layer thickness is controlled 0.07-0.12mm, then puts into baking oven dry, and oven temperature is interval and be set to respectively 90 ℃ ~ 110 ℃ drying time, 60s; 120 ℃ ~ 130 ℃, 30s;

(2.2) be coated with and scrape TPU foaming layer

On surface layer basis, spray melting TPU foaming layer resin, coating layer thickness is controlled at 0.2 ~ 0.30mm, then puts into baking oven slaking, and oven temperature interval and curing time arrange and be respectively 120 ℃ ~ 140 ℃, curing time 60-70s;

(2.3) be coated with and scrape adhesive linkage

In foaming layer, be coated with and scrape bonded adhesives, thickness of adhibited layer is controlled 0.07-0.10mm, enters baking oven and is dried to half-driedly, and then with base cloth laminating, paper, leather are separated;

(2.4) foaming

Above-mentioned semi-finished product are put into baking oven foaming, and temperature range is divided into three sections, 180 ℃ ~ 185 ℃ of leading portions, and 190 ℃ ~ 195 ℃, stage casing, 200 ℃ ~ 210 ℃ of back segments, foamed time is 120 ~ 150s;

(2.5) surface treatment of foaming synthetic leather

By the semi-finished product after foaming after conventional embossing or embossing, adopt three editions table place machines to carry out surface treatment, the starching amount of water-based table place layer resin is controlled at 40-60g/m 2, baking temperature and time are respectively 140-150 ℃, 60-90s, and the leather base after surface treatment surface treatment gets product after routine is rubbed line, dry, gage.

Further arrange is that the water-based surface layer of surface layer slurry use in described step (1.1) is wear-resisting, the aliphatic of scratch resistance and/or at least one in aromatic urethane with polyurethane; In described step (1.4) table place layer use polyurethane gloss oil to be modulus add lustre in gloss oil and/or delustring gloss oil at aliphatic and/or the aromatic urethane of 50 ~ 70 Mpa at least one.

Further arranging is that the TPU resin that in described step (1.2), foaming layer is used is the thermoplastic polyurethane of relative molecular mass 8-11 ten thousand, melt temperature scope 120-140 ℃.

Further arrange is that water cross-linking agent in described step (1.4) is at least one in polycarbodiimide, polyaziridine, epoxy resin and/or end-sealed type water-based polyurethane.

Further arrange is that in described step (1.3), bonded adhesives is water-fast, solvent resistance is good aqueous polyurethane and/or at least one in water-based EVA resin and derivative thereof.

Further arrange is that feel modifying agent in described step (1.4) is at least one in silicone based polymer, oil/wax compound and/or Organic fluoride base polymer.

Employing TPU Foamex replace solvents type Foamex of the present invention, because traditional organic foaming agent is as good with TPU resin compatible under molten condition in AC blowing agent, be uniformly dispersed, its foaming process conditions is as similar to traditional handicraft in blowing temperature, foamed time, foaming machine etc., without large investment and scrap build, technique connecting is good, has operability and practicality.

Technology provided by the present invention is applicable to the manufacture of the synthetic leather that the richness such as luggage leather, upper leather, sofa artificial leather, plastic floor leather have relatively high expectations, and finished leather is plentiful, soft, comfortable, ventilative, thoroughly wet, in finished product leather, VOC content is lower than 5mmg/kg, and other performance all reaches or is better than industry standard.

The present invention has following remarkable advantage:

1. adopt water-based material replace solvents shaped material from source, to eliminate the environmental pollution that organic solvent causes, save a large amount of organic solvent resources, eliminated disaster hidden-trouble, significantly improve labourer's employment environment, be conducive to the sustainable development of industry.

2, adopt TPU as foaming layer, TPU resin is as good in AC foaming compatibility with organic foaming agent under molten condition, is uniformly dispersed, its foam process bar is similar to traditional handicraft to foaming machine etc., without large investment and scrap build, technique connecting is good, has operability and practicality;

3, water-based and TPU material substitution solvent-borne type material, met the ecological foaming synthetic leather requirement of European Union, improved foaming synthetic leather Products Eco grade and competitiveness in the international market.

Below in conjunction with the specific embodiment, the present invention is described further.

The specific embodiment

Below by embodiment, the present invention is specifically described; only be used to further illustrate the present invention; can not be interpreted as limiting the scope of the present invention, the technician in this field can make some nonessential improvement and adjustment to the present invention according to the content of foregoing invention.

Following embodiment umber used is weight portion.

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the manufacture of embodiment 1 plastic floor leather

(1) preparation of aqueous polyurethane surface layer resin (weight portion)

By 100 parts of polyurethane, 20 parts of the brown mill bases of water-based for water-based surface layer wear-resisting, scratch resistance, 0.2 part of water-based levelling agent, 0.1 part of water-based defoamer, 0.3 part of water-based thickener, polycarbodiimide crosslinkers mix by 2 parts, being made into viscosity is 25 ℃ of 2500mPa.s(temperature, as follows) surface layer resin, filters standby;

(2) preparation of TPU foaming layer resin (weight portion)

The formula of TPU foaming layer resin is with conventional, and be about to the auxiliary agents such as the TPU resin of 125 ℃ of relative molecular masses 110,000, melt temperature, brown toner, blowing agent, foam stabilizer, heat stabilizer and mix by a certain percentage, heating and melting, standby;

(3) preparation of water-based bonded adhesives

0.5 part of 100 parts of aqueous polyurethane bonded adhesives, water-based thickener is mixed, 0.2 part of levelling agent, controlling viscosity is 4500-5000 mPa.s, filters standby;

(4) preparation of water-based table place layer resin

0.5 part of 100 parts of aqueous polyurethane delustring gloss oil, the water-based thickener of modulus 60MPa is mixed, 0.2 part of water-based levelling agent, 2.5 parts of water-based polyaziridine crosslinking agents, 5 parts of organic silicon hand feeling agent, being made into viscosity is 1200mPa.s water-based table place layer resin, filters standby;

(5) manufacture of foaming synthetic leather crust leather

(a) be coated with and scrape surface layer

Adopt straight coating method, aqueous polyurethane surface layer resin is coated with and is scraped in release liners, coating layer thickness is controlled 0.07mm, then puts into baking oven dry, and oven temperature is interval and be set to respectively 90 ℃ drying time, 60s; 120 ℃, 30s;

(b) be coated with and scrape TPU foaming layer

On surface layer basis, be coated with and scrape TPU foaming layer resin, coating layer thickness is controlled at 0.2mm, then puts into baking oven slaking, and oven temperature interval and curing time arrange and be respectively 120 ℃ ~ 130 ℃, curing time 60-70s;

(c) be coated with and scrape adhesive linkage

In foaming layer, bonded adhesives is scraped in painting, and thickness of adhibited layer is controlled 0.07mm, and enter baking oven and be dried to half-dried (110 ℃ are dried 90s), then with base cloth laminating, paper, leather separation;

(d) foaming

Above-mentioned semi-finished product are put into baking oven foaming, and temperature range is divided into three sections, 180 ℃ of leading portions, and 190 ℃, stage casing, 210 ℃ of back segments, foamed time is 120s.

(6) surface treatment (table place)

By through common process embossing, then adopt three editions table place machines to carry out table place the semi-finished product after foaming, the starching amount of table place layer resin is controlled at 40g/m 2, baking temperature and time are respectively 140 ℃, 90s, and the leather base behind table place gets product after routine is rubbed line, dry, gage.

The plastic floor leather outward appearance that this method is produced is brown dumb light, and feel is soft and smooth, expansion ratio 2.0-2.5, and softness is moderate, VOC content per kilogram leather 4.0mg.

?

the manufacture of embodiment 2 sofa artificial leathers

(1) preparation of aqueous polyurethane surface layer resin (weight portion)

By 100 parts of polyurethane, 20 parts of the cream-coloured mill bases of water-based for water-based surface layer wear-resisting, scratch resistance, 0.5 part of water-based levelling agent, 0.3 part of water-based defoamer, 0.5 part of water-based thickener, aqueous epoxy resins crosslinking agent mix by 5.0 parts, controlling viscosity is 3000 mPa.s left and right (25 ℃ of temperature, as follows), filter standby;

(2) preparation of TPU foaming layer resin (weight portion)

The formula of TPU foaming layer resin, with conventional, be about to the auxiliary agents such as relative molecular mass 90,000, the TPU resin of 120 ℃ of left and right of melt temperature, cream-coloured toner, blowing agent, foam stabilizer, heat stabilizer and mix by a certain percentage, and heating and melting is standby;

(3) preparation of water-based bonded adhesives

0.8 part of 100 parts of aqueous polyurethane bonded adhesives, water-based thickener is mixed, 0.4 part of levelling agent, being made into viscosity is 5000 mPa.s bonded adhesives, filters standby.

(4) preparation of water-based table place layer resin

By the aqueous polyurethane of modulus 65Mpa add lustre to 100 parts of gloss oil, 0.8 part of water-based thickener, water-based levelling agent 0.2-0.4 part, 5 parts of water-based end-sealed type polyurethane cross-linking agents, 4.0 parts of fluorine-containing hand feeling agents mix, and are made into viscosity and are 1000-1500 mPa.s water-based top layer resin, standby;

(5) manufacture of foaming synthetic leather crust leather:

(a) be coated with and scrape surface layer

Adopt straight coating method, aqueous polyurethane surface layer resin is coated with and is scraped in release liners, coating layer thickness is controlled 0.10mm, then puts into baking oven dry, and oven temperature is interval and be set to respectively 110 ℃ drying time, 60s; 1130 ℃, 30s;

(b) be coated with and scrape TPU foaming layer

On surface layer basis, be coated with and scrape TPU foaming layer resin, coating layer thickness is controlled at 0.25mm, then puts into baking oven slaking, and oven temperature interval and curing time arrange and be respectively 160 ℃, curing time 70s;

(c) be coated with and scrape adhesive linkage

In foaming layer, bonded adhesives is scraped in painting, and thickness of adhibited layer is controlled 0.10mm, and enter baking oven and be dried to half-dried (110 ℃ are dried 90s), then with base cloth laminating, paper, leather separation;

(d) foaming

Above-mentioned semi-finished product are put into baking oven foaming, and temperature range is divided into three sections, 180 ℃ ~ 185 ℃ of leading portions, and 190 ℃ ~ 195 ℃, stage casing, 200 ℃ ~ 210 ℃ of back segments, foamed time is 150s.

(3) surface treatment of foaming synthetic leather (table place)

By foaming after semi-finished product through conventional embossing (line) after, employing three editions table place machines carry out table place, the starching amount of water-based table place layer resin is controlled at 60g/m 2, baking temperature and time are respectively 140-150 ℃, 90s, and the leather base behind table place gets product after routine is rubbed line, dry, gage.

The sofa artificial leather outward appearance that this method is produced is cream-coloured light, and coating is wear-resisting, scratch resistance, water-fast, resistance to solvent, and oil resistant dirty (water wiping can be cleaned), expansion ratio approximately 3.5, plentiful abundant, VOC content 3.0mg/kg(leather).

?

the manufacture of embodiment 3 luggage leathers

(1) preparation of aqueous polyurethane surface layer resin (weight portion)

By wear-resisting, scratch resistance good 100 parts of polyurethane, 30 parts of the red mill bases of water-based for water-based surface layer, 0.3 part of water-based levelling agent, 0.3 part of water-based defoamer, 0.3 part of water-based thickener, water-based carbodiimides crosslinking agent mix by 3.0 parts, controlling viscosity is 2800 mPa.s left and right (25 ℃ of temperature, as follows), filter standby;

(2) preparation of TPU foaming layer resin (weight portion)

The formula of TPU foaming layer resin is with conventional, and be about to the auxiliary agents such as the TPU resin of 130 ℃ of relative molecular masses 100,000, melt temperature, red toner, blowing agent, foam stabilizer, heat stabilizer and mix by a certain percentage, heating and melting, standby;

(3) preparation of water-based bonded adhesives

0.5 part of 100 parts of water-based EVA bonded adhesives, water-based thickener is mixed, 0.3 part of levelling agent, being made into viscosity is 4000 mPa.s bonded adhesives, filters standby.

(4) preparation of water-based table place layer resin

By the aqueous polyurethane of modulus 70Mpa add lustre to 80 parts of gloss oil, 20 parts of delustring gloss oil, 0.5 part of water-based thickener, 0.4 part of water-based levelling agent, 4 parts of water-based end-sealed type polyurethane cross-linking agents, 4.0 parts of oil wax hand feeling agents mix, and are made into viscosity and are 1500 mPa.s water-based table place layer resin, standby;

(5) manufacture of foaming synthetic leather crust leather:

(a) be coated with and scrape surface layer

Adopt straight coating method, aqueous polyurethane surface layer resin is coated with and is scraped in release liners, coating layer thickness is controlled 0.10mm, then puts into baking oven dry, and oven temperature is interval and be set to respectively 110 ℃ drying time, 60s; 130 ℃, 30s;

(b) be coated with and scrape TPU foaming layer

On surface layer basis, be coated with and scrape TPU foaming layer resin, coating layer thickness is controlled at 0.3mm, then puts into baking oven slaking, and oven temperature interval and curing time arrange and be respectively 160 ℃, curing time 65s;

(c) be coated with and scrape adhesive linkage

In foaming layer, bonded adhesives is scraped in painting, and thickness of adhibited layer is controlled 0.09mm, and enter baking oven and be dried to half-dried (110 ℃ are dried 90s), then with base cloth laminating, paper, leather separation;

(d) foaming

Above-mentioned semi-finished product are put into baking oven foaming, and temperature range is divided into three sections, 180 ℃ ~ 185 ℃ of leading portions, and 195 ℃, stage casing, 205 ℃ ~ 210 ℃ of back segments, foamed time is 140s.

(3) surface treatment of foaming synthetic leather (table place)

By foaming after semi-finished product through conventional embossing (line) after, employing three editions table place machines carry out table place, the starching amount of water-based table place layer resin is controlled at 50g/m 2, baking temperature and time are respectively 150 ℃, 90s, and the leather base behind table place gets product after routine is rubbed line, dry, gage.

The luggage leather outward appearance that this method is produced is red half light, and coating is wear-resisting, scratch resistance, and resistance to solvent has the sliding sense of oily wax, and expansion ratio 3.5-4.0 is plentiful abundant, VOC content 3.5mg/kg (leather).

 

the manufacture of embodiment 4 upper leathers

(1) preparation of aqueous polyurethane surface layer resin (weight portion)

By wear-resisting, scratch resistance is good 100 parts of polyurethane, 25 parts of aqueous black mill bases for water-based surface layer, 0.3 part of water-based levelling agent, 0.35 part of water-based defoamer, 0.3 part of water-based thickener, water-based aziridine crosslinker mix by 3.0 parts, controlling viscosity is 3000 mPa.s left and right (25 ℃ of temperature, as follows), filter standby;

(2) preparation of TPU foaming layer resin (weight portion)

The formula of PU foaming layer resin is with conventional, and the auxiliary agents such as TPU resin, black toner, blowing agent, foam stabilizer, heat stabilizer that are about to 140 ℃ of relative molecular mass 110,000 left and right, melt temperature mix by a certain percentage, and heating and melting is standby;

(3) preparation of water-based bonded adhesives

0.5 part of 100 parts of water-based solvent resistant solvent type urethane bonded adhesives, water-based thickener is mixed, 0.3 part of levelling agent, being made into viscosity is 4500 mPa.s bonded adhesives, filters standby.

(4) preparation of water-based table place layer resin

By the aqueous polyurethane of modulus 65Mpa add lustre to 100 parts of gloss oil, 0.5 part of water-based thickener, 0.3 part of water-based levelling agent, 4 parts of water-based end-sealed type polyurethane cross-linking agents, 4.0 parts of oil wax hand feeling agents mix, and are made into viscosity and are 1200 mPa.s water-based table place layer resin, standby;

(5) manufacture of foaming synthetic leather crust leather:

(a) be coated with and scrape surface layer

Adopt straight coating method, aqueous polyurethane surface layer resin is coated with and is scraped in release liners, coating layer thickness is controlled 0.12mm, then puts into baking oven dry, and oven temperature is interval and be set to respectively 110 ℃ drying time, 60s; 130 ℃, 30s;

(b) be coated with and scrape TPU foaming layer

On surface layer basis, be coated with and scrape TPU foaming layer resin, coating layer thickness is controlled at 0.3mm, then puts into baking oven slaking, and oven temperature interval and curing time arrange and be respectively 160 ℃, curing time 70s;

(c) be coated with and scrape adhesive linkage

In foaming layer, bonded adhesives is scraped in painting, and thickness of adhibited layer is controlled 0.1mm, and enter baking oven and be dried to half-dried (110 ℃ are dried 90s), then with base cloth laminating, paper, leather separation;

(d) foaming

Above-mentioned semi-finished product are put into baking oven foaming, and temperature range is divided into three sections, 185 ℃ of left and right of leading portion, and 190 ℃, stage casing, 200 ℃ ~ 205 ℃ of back segments, foamed time is 150s.

(3) surface treatment of foaming synthetic leather (table place)

By foaming after semi-finished product through conventional embossing (line) after, employing three editions table place machines carry out table place, the starching amount of water-based top layer resin is controlled at 60g/m 2, baking temperature and time are respectively 150 ℃, 90s, and the leather base behind table place gets product after routine is rubbed line, dry, gage.

The upper leather outward appearance that this method is produced is black, light, and coating has good wear-resisting, water-fast, scratch resistance and solvent resistance, and feel is cunning, plentiful abundant, VOC content 4.0mg/kg (leather).

Claims (6)

1. the foaming synthetic leather manufacture method based on water-base resin and TPU resin, is characterized in that comprising the following steps:
(1) preparation of aqueous polyurethane table place layer resin, surface layer resin, TPU foaming layer resin and water-based bonded adhesives, in this step, each operation is in no particular order;
(1.1) preparation of aqueous polyurethane surface layer resin, in parts by weight:
By 100 parts of polyurethane, water-based levelling agent 0.2-0.5 part, aqueous color paste 20-30 part for water-based surface layer, water-based defoamer 0.1-0.3 part, water-based thickener 0.3-0.5 part, crosslinking agent mix by 2-5 part, and being at room temperature made into viscosity is the aqueous polyurethane surface layer resin of 2500-3000 mPa.s;
(1.2) preparation of TPU foaming layer resin
TPU resin, toner, blowing agent, foam stabilizer, heat stabilizer are mixed, and heating and melting, is configured to TPU foaming layer resin;
(1.3) preparation of water-based bonded adhesives, in parts by weight:
100 parts of the bonded adhesives of water-based, water-based thickener 0.5-0.8 part are mixed, levelling agent 0.2-0.4 part, being at room temperature made into viscosity is the water-based bonded adhesives of 4500-5000 mPa.s;
(1.4) preparation of water-based table place layer resin, in parts by weight:
100 parts of aqueous polyurethane gloss oil, water-based thickener 0.5-0.8 part are mixed, water-based levelling agent 0.2-0.4 part, water cross-linking agent 2-5 part, feel modifying agent 2-5 part, being at room temperature made into viscosity is the water-based table place layer resin of 1000-1500 mPa.s;
(2) manufacture of foaming synthetic leather crust leather: adopt three to be coated with four baking techniques, carry out successively following operation: release liners unreels, be coated with scrape surface layer, dry, cooling, be coated with TPU foaming layer, dry, cooling, be coated with adhesive linkage, be dried to leather hard, base cloth laminating, foaming, coolingly remove from office separated, rolling with paper, concrete technology parameter is:
(2.1) be coated with and scrape surface layer
Adopt straight coating method, aqueous polyurethane surface layer resin is coated with and is scraped in release liners, coating layer thickness is controlled 0.07-0.12mm, then puts into baking oven dry, and oven temperature is interval and be set to respectively 90 ℃ ~ 110 ℃ drying time, 60s; 120 ℃ ~ 130 ℃, 30s;
(2.2) be coated with and scrape TPU foaming layer
On surface layer basis, spray melting TPU foaming layer resin, coating layer thickness is controlled at 0.2 ~ 0.30mm, then puts into baking oven slaking, and oven temperature interval and curing time arrange and be respectively 120 ℃ ~ 140 ℃, curing time 60-70s;
(2.3) be coated with and scrape adhesive linkage
In foaming layer, be coated with and scrape bonded adhesives, thickness of adhibited layer is controlled 0.07-0.10mm, enters baking oven and is dried to half-driedly, and then with base cloth laminating, paper, leather are separated;
(2.4) foaming
Above-mentioned semi-finished product are put into baking oven foaming, and temperature range is divided into three sections, 180 ℃ ~ 185 ℃ of leading portions, and 190 ℃ ~ 195 ℃, stage casing, 200 ℃ ~ 210 ℃ of back segments, foamed time is 120 ~ 150s;
(2.5) surface treatment of foaming synthetic leather
By the semi-finished product after foaming after conventional embossing or embossing, adopt three editions table place machines to carry out surface treatment, the starching amount of water-based table place layer resin is controlled at 40-60g/m 2, baking temperature and time are respectively 140-150 ℃, 60-90s, and the leather base after surface treatment gets product after routine is rubbed line, dry, gage.
2. a kind of foaming synthetic leather manufacture method based on water-base resin and TPU resin according to claim 1, is characterized in that: in described step (1.1), the water-based surface layer of surface layer slurry use is wear-resisting, the aliphatic of scratch resistance and/or at least one in aromatic urethane with polyurethane; In described step (1.4) table place layer use polyurethane gloss oil to be modulus add lustre in gloss oil and/or delustring gloss oil at aliphatic and/or the aromatic urethane of 50 ~ 70 Mpa at least one.
3. a kind of foaming synthetic leather manufacture method based on water-base resin and TPU resin according to claim 1, it is characterized in that: the TPU resin that in described step (1.2), foaming layer is used is the thermoplastic polyurethane of relative molecular mass 8-11 ten thousand, melt temperature scope 120-140 ℃.
4. a kind of foaming synthetic leather manufacture method based on water-base resin and TPU resin according to claim 1, is characterized in that: the water cross-linking agent in described step (1.4) is at least one in polycarbodiimide, polyaziridine, epoxy resin and/or end-sealed type water-based polyurethane.
5. a kind of foaming synthetic leather manufacture method based on water-base resin and TPU resin according to claim 1, is characterized in that: in described step (1.3), bonded adhesives is water-fast, solvent resistance is good aqueous polyurethane and/or at least one in water-based EVA resin and derivative thereof.
6. a kind of foaming synthetic leather manufacture method based on water-base resin and TPU resin according to claim 1, is characterized in that: the feel modifying agent in described step (1.4) is at least one in silicone based polymer, oil/wax compound and/or Organic fluoride base polymer.
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