CN106319982A - Polyurethane synthetic leather production process - Google Patents

Polyurethane synthetic leather production process Download PDF

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Publication number
CN106319982A
CN106319982A CN201510365289.1A CN201510365289A CN106319982A CN 106319982 A CN106319982 A CN 106319982A CN 201510365289 A CN201510365289 A CN 201510365289A CN 106319982 A CN106319982 A CN 106319982A
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CN
China
Prior art keywords
base fabric
dmf
bass
resin
slurry
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510365289.1A
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Chinese (zh)
Inventor
不公告发明人
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhenjiang Kaiyuan Footwear Co Ltd
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Zhenjiang Kaiyuan Footwear Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhenjiang Kaiyuan Footwear Co Ltd filed Critical Zhenjiang Kaiyuan Footwear Co Ltd
Priority to CN201510365289.1A priority Critical patent/CN106319982A/en
Publication of CN106319982A publication Critical patent/CN106319982A/en
Pending legal-status Critical Current

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Abstract

The invention relates to the technical field of leather processing and particularly provides a polyurethane synthetic leather production process, which includes the steps of selecting polyurethane resin, preparing polyurethane slurry, soaking a base fabric in water, coating the base fabric with the slurry and curing the slurry, water-washing and drying the synthetic leather, and reeling the product.

Description

A kind of Synthetic Leather production technology
Technical field
The present invention relates to leather processing technique field, particularly a kind of Synthetic Leather production technology.
Background technology
The production method of Synthetic Leather is will to add DMF solvent and other filler in polyurethane wet resin, mixed liquor made by auxiliary agent, after vacuum machine deaeration, impregnate or be coated in base fabric, it is then placed in, with solvent (DMF), there is affinity, and in water incompatible with polyurethane resin, solvent (DMF) is changed by water, polyurethane resin gradually solidifies, thus form porous epithelium, i.e. microvoid polyurethane grain layer, it is referred to as bass traditionally, its connotation is the meaning of base material, bass through dry method veneer or surface after ornamenting, such as surface printing, embossing, after the techniques such as mill skin, just can become Synthetic Leather finished product.
Summary of the invention
The present invention proposes a kind of Synthetic Leather production technology, and concrete technological process is as follows:
A, choose polyurethane resin: choose normal wet resin, special including mill skin, it is impregnated with special and cold-resistant resin;The modulus standard of resin is 2.0MPa to 30.0MPa;According to bass soft durometer, selecting high low modulus trade mark resin, single coating bass, owing to abscess is little, density big, need to add a large amount of wood powder, when being used for cold district such as product, and the cold tolerance of product to be taken into full account, use the resin that cold tolerance is good;
B, preparation polyurethane slurry: single coating slurry required by bass is viscous to be controlled at 7000 9000Pa.s;During dispensing, charging sequence is initially charged DMF at container, then adds wood powder, and is sufficiently stirred for about 10min with blender, it is ensured that wood powder is scattered in DMF;Utilize vacuum defoamation machine deaeration 40min, if slurry viscosity is higher, inclined heated plate can be extended, finally by 60 100 mesh filter screen filtration;
C, base fabric immersion process: base fabric sends, and enter soaking pit through storage cloth holder, then with compression roller, the moisture in base fabric are extracted, and through plating, base fabric is scalded half-dried by wheel;In tank in addition to clear water, also should add the anion surfactant of 1%;
D, coating solidification: treated base fabric, by coating platform, use painting cutter cladding process that slurry mixed liquor is uniformly coated in base fabric;When being base using nylon loop, coat along hair, bass any surface finish;Inverse hair coats, bass rough surface;Gu the solidification liquid in groove is made up of with DMF water, the content of DMF is generally 20%---25%;
E, wash, dry, batch: polyurethane coating layer is after solidification completely, it is ensured that in last rinsing bowl, the content of DMF is below 1%;Rinsing bowl is it is generally required to warming operation.
Detailed description of the invention
A kind of Synthetic Leather production technology, concrete technological process is as follows:
A, choose polyurethane resin: choose normal wet resin, special including mill skin, it is impregnated with special and cold-resistant resin;The modulus standard of resin is 2.0MPa to 30.0MPa;According to bass soft durometer, selecting high low modulus trade mark resin, single coating bass, owing to abscess is little, density big, need to add a large amount of wood powder, when being used for cold district such as product, and the cold tolerance of product to be taken into full account, use the resin that cold tolerance is good;
B, preparation polyurethane slurry: single coating slurry viscosity required by bass is higher, and general control is at 7000 9000Pa.s.During dispensing, charging sequence is even more important.Typically it is initially charged DMF at container, then adds wood powder, and be sufficiently stirred for about about 10min with blender, it is ensured that wood powder is scattered in DMF.If first DMF being mixed stirring with polyurethane, then add wood powder, then can make wood powder conglomeration, it is impossible to be scattered in fully in resin solution, even if filtering, the wood powder of conglomeration the most easily blocks drainage screen, and serious cannot use, after the slurry viscosity of preparation meets the requirements, vacuum defoamation machine deaeration 40min will be utilized, if slurry viscosity is higher, can proper extension inclined heated plate, finally by 60 100 mesh filter screen filtration.
C, base fabric immersion process: base fabric sends, and enter soaking pit through storage cloth holder, then with compression roller, the moisture in base fabric are extracted, and through plating, base fabric is scalded half-dried by wheel.The effect that immersion processes has two, and one is to improve fabric moisture, prevents slurry from penetrating in base fabric tissue, produces phenomenon of revealing the exact details, waste raw material.Two is the base fabric poor to defat, in tank in addition to clear water, also should add the anion surfactant of 1%, to improve the hydrophilic of base fabric, improves the presentation quality of bass.
D, coating solidification: treated base fabric, by coating platform, use painting cutter cladding process that slurry mixed liquor is uniformly coated in base fabric.When being base using nylon loop, it should be noted that the direction of nylon loop wildness, coat along hair, bass any surface finish.Inverse hair coats, bass rough surface.The thickness of coating is the thinnest, it is impossible to fig leaf hair, bass rough surface, and it is nonelastic that feel sends out plate, and coating is the thickest, and to easily cause abscess irregular, surface layer and the defect such as base material separates.Solidification liquid in coagulating basin is made up of with DMF water, and the content of DMF is generally 20%---25%.When producing mill skin bass, the content of DMF controls between 10%--15%.Too high content can affect setting rate, and causes amount of solid content in water to increase, and the too low cost recovery not only increasing DMF of concentration also makes bass surface shrinkage rate increase, and causes crimping DMF to migrate in water rapidly, and it is the slowest that water penetrates into bed of material medium velocity.In slurry process of setting, produce certain contraction, make coating thinning, and have a certain degree of crimping.For preventing crimping, on the one hand DMF concentration in coagulating basin to be ensured, on the other hand can add a little S-80 when dispensing, postpones the solidification on surface, increases abscess.Selvedge can also be clamped with clip and increase jockey pulley method prevents crimping.The temperature of coagulating basin is generally room temperature, and winter can suitably heat, and is normally controlled in 25 DEG C, and too high temperature can make coating failure intensity decline, and film modulus declines, and surface uniformity coefficient is deteriorated, but microcellular structure is uniform.Dope layer is affixed to out coagulating basin solidification completely from entering water-setting, takes around 8 15min, and this has substantial connection with the DMF concentration in formula, resin grade, water and temperature etc..The bed of material is before solidification completely, it is impossible to guide rollers contact, otherwise can damage surface layer.
E, wash, dry, batch: Polyurethane coating layer is after solidification completely, and still remaining a number of DMF, these DMF in its hole-layer foam must deviate from rinsing bowl by force, time as unclean in removing, bass surface can be caused after drying to have the defects such as pit.To guarantee that in technology controlling and process the content of DMF is below 1% in last rinsing bowl, thus can ensure that the DMF removing in bass is clean, in order to make the speed that washes out of DMF accelerate and reduce the DMF residuing in bass, rinsing bowl is typically necessary warming operation.

Claims (1)

1. a Synthetic Leather production technology, concrete technological process is as follows:
A, choose polyurethane resin: choose normal wet resin, special including mill skin, it is impregnated with special and cold-resistant resin;The modulus standard of resin is 2.0MPa to 30.0MPa;According to bass soft durometer, selecting high low modulus trade mark resin, single coating bass, owing to abscess is little, density big, need to add a large amount of wood powder, when being used for cold district such as product, and the cold tolerance of product to be taken into full account, use the resin that cold tolerance is good;
B, preparation polyurethane slurry: single coating slurry required by bass is viscous to be controlled at 7000 9000Pa.s;During dispensing, charging sequence is initially charged DMF at container, then adds wood powder, and is sufficiently stirred for about 10min with blender, it is ensured that wood powder is scattered in DMF;Utilize vacuum defoamation machine deaeration 40min, if slurry viscosity is higher, inclined heated plate can be extended, finally by 60 100 mesh filter screen filtration;
C, base fabric immersion process: base fabric sends, and enter soaking pit through storage cloth holder, then with compression roller, the moisture in base fabric are extracted, and through plating, base fabric is scalded half-dried by wheel;In tank in addition to clear water, also should add the anion surfactant of 1%;
D, coating solidification: treated base fabric, by coating platform, use painting cutter cladding process that slurry mixed liquor is uniformly coated in base fabric;When being base using nylon loop, coat along hair, bass any surface finish;Inverse hair coats, bass rough surface;Gu the solidification liquid in groove is made up of with DMF water, the content of DMF is generally 20%---25%;
E, wash, dry, batch: polyurethane coating layer is after solidification completely, it is ensured that in last rinsing bowl, the content of DMF is below 1%;Rinsing bowl needs warming operation.
CN201510365289.1A 2015-06-29 2015-06-29 Polyurethane synthetic leather production process Pending CN106319982A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510365289.1A CN106319982A (en) 2015-06-29 2015-06-29 Polyurethane synthetic leather production process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510365289.1A CN106319982A (en) 2015-06-29 2015-06-29 Polyurethane synthetic leather production process

Publications (1)

Publication Number Publication Date
CN106319982A true CN106319982A (en) 2017-01-11

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107227625A (en) * 2017-07-21 2017-10-03 张家港嘉泰超纤科技有限公司 A kind of thin folding line low resilience superfine fiber chemical leather and preparation method thereof
CN107299537A (en) * 2017-08-18 2017-10-27 天守(福建)超纤科技股份有限公司 It is a kind of antifouling wear-resisting to contaminate the preparation method of sofa synthetic leather
CN107916578A (en) * 2017-11-30 2018-04-17 清远市齐力合成革有限公司 A kind of production method of the two-sided Synthetic Leather of cashmere sense
CN108625187A (en) * 2018-04-24 2018-10-09 安徽禾臣新材料有限公司 A kind of preparation method of infrared spectrophotometer grating production polishing damping cloth

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107227625A (en) * 2017-07-21 2017-10-03 张家港嘉泰超纤科技有限公司 A kind of thin folding line low resilience superfine fiber chemical leather and preparation method thereof
CN107299537A (en) * 2017-08-18 2017-10-27 天守(福建)超纤科技股份有限公司 It is a kind of antifouling wear-resisting to contaminate the preparation method of sofa synthetic leather
CN107916578A (en) * 2017-11-30 2018-04-17 清远市齐力合成革有限公司 A kind of production method of the two-sided Synthetic Leather of cashmere sense
CN107916578B (en) * 2017-11-30 2020-05-05 清远市齐力合成革有限公司 Method for manufacturing cashmere-feeling double-sided polyurethane synthetic leather
CN108625187A (en) * 2018-04-24 2018-10-09 安徽禾臣新材料有限公司 A kind of preparation method of infrared spectrophotometer grating production polishing damping cloth

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Application publication date: 20170111