CN111979789A - Soft transparent polyurethane surface film and preparation method thereof - Google Patents
Soft transparent polyurethane surface film and preparation method thereof Download PDFInfo
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- CN111979789A CN111979789A CN202010784190.6A CN202010784190A CN111979789A CN 111979789 A CN111979789 A CN 111979789A CN 202010784190 A CN202010784190 A CN 202010784190A CN 111979789 A CN111979789 A CN 111979789A
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- 239000004814 polyurethane Substances 0.000 title claims abstract description 67
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 66
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000002344 surface layer Substances 0.000 claims abstract description 88
- 239000003292 glue Substances 0.000 claims abstract description 47
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 41
- 239000010410 layer Substances 0.000 claims abstract description 36
- 239000012790 adhesive layer Substances 0.000 claims abstract description 35
- 239000004744 fabric Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 20
- 239000002562 thickening agent Substances 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims description 60
- 238000001035 drying Methods 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 24
- 239000011248 coating agent Substances 0.000 claims description 21
- 238000000576 coating method Methods 0.000 claims description 21
- 210000003491 skin Anatomy 0.000 claims description 21
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- 238000004519 manufacturing process Methods 0.000 claims description 11
- 210000002615 epidermis Anatomy 0.000 claims description 10
- 229920001558 organosilicon polymer Polymers 0.000 claims description 8
- 150000001718 carbodiimides Chemical class 0.000 claims description 6
- 229920000058 polyacrylate Polymers 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 6
- 230000032683 aging Effects 0.000 abstract description 5
- 230000006872 improvement Effects 0.000 abstract description 4
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- 230000007774 longterm Effects 0.000 abstract description 3
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- 239000002649 leather substitute Substances 0.000 description 2
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
- D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
- D06N3/145—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes two or more layers of polyurethanes
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
- D06N3/0015—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using fibres of specified chemical or physical nature, e.g. natural silk
- D06N3/0036—Polyester fibres
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0061—Organic fillers or organic fibrous fillers, e.g. ground leather waste, wood bark, cork powder, vegetable flour; Other organic compounding ingredients; Post-treatment with organic compounds
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/007—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by mechanical or physical treatments
- D06N3/0077—Embossing; Pressing of the surface; Tumbling and crumbling; Cracking; Cooling; Heating, e.g. mirror finish
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0086—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique
- D06N3/0095—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique by inversion technique; by transfer processes
- D06N3/0097—Release surface, e.g. separation sheets; Silicone papers
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2209/00—Properties of the materials
- D06N2209/10—Properties of the materials having mechanical properties
- D06N2209/103—Resistant to mechanical forces, e.g. shock, impact, puncture, flexion, shear, compression, tear
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2209/00—Properties of the materials
- D06N2209/16—Properties of the materials having other properties
- D06N2209/1678—Resistive to light or to UV
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2209/00—Properties of the materials
- D06N2209/16—Properties of the materials having other properties
- D06N2209/1685—Wear resistance
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2211/00—Specially adapted uses
- D06N2211/12—Decorative or sun protection articles
- D06N2211/28—Artificial leather
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides a soft transparent polyurethane surface leather film, which comprises base cloth, an adhesive layer and a surface layer, wherein the adhesive layer is arranged between the base cloth and the surface layer, and the base cloth and the surface layer are adhered together through the adhesive layer; the surface layer and the glue layer both contain polyurethane, bridging agent, thickening agent, leveling agent and defoaming agent; meanwhile, a method for preparing the light and thin flexible polyurethane surface film is also provided, and comprises the steps of surface layer preparation, adhesive layer and base cloth bonding and pasting together, curing treatment and stripping, and the wear resistance, the fracture resistance and the transparency of each layer are enhanced along with the improvement of the components of each layer. In addition, the skin film also has excellent light aging resistant effect, and can avoid the phenomena of aging, peeling, cracks and the like of products after long-term sun exposure.
Description
Technical Field
The invention relates to the technical field of polyurethane composite materials, in particular to a soft transparent polyurethane surface film and a preparation method of the polyurethane surface film.
Background
Polyurethane (abbreviated as PU) is short for Polyurethane, is a new organic polymer material, and is widely applied to numerous fields of national economy due to its excellent properties. Has the advantages that: the density is low, the texture is soft, and the wearing is comfortable and portable; the dimensional stability is good, and the storage life is long; excellent wear resistance and flexing resistance; excellent shock absorption and anti-skid performance; better temperature resistance; good chemical resistance, etc. The application field of the product relates to light industry, chemical industry, electronics, textile, medical treatment, building materials, automobiles, national defense, aerospace, aviation and the like. The polyurethane material is used as surface film finishing agent, artificial leather, synthetic leather coating and shoe inner and outer soles, and the polyurethane is widely used for manufacturing high-grade leather shoes, automobile inner ornaments and the like.
Thermoplastic polyurethane elastomers (TPU) are largely classified into polyester and polyether types, and are plasticized by heating, and have no or little cross-linking in their chemical structure, and their molecules are essentially linear, but have some physical cross-linking. The halogen-free flame-retardant TPU can replace soft PVC to meet the environmental protection requirements of more and more fields.
The interior decoration material of passenger car is developing towards the synthetic epidermis membrane of lightweight, environmental protection and energy saving, high abrasion resistance, high grade. The environment-friendly solvent-free synthetic skin film of the polyurethane product is suitable for interior decoration of a vehicle, but the production process and the processing method of the environment-friendly solvent-free synthetic skin film have the common problems of unstable quality and large product performance fluctuation in the processing process, and cannot meet the requirement of high strength, so that the production and manufacturing cost is high. Accordingly, the present invention provides a soft and transparent polyurethane top film and a method for producing the polyurethane top film.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a soft transparent polyurethane surface film which comprises a base fabric, an adhesive layer and a surface layer, wherein the surface layer can enhance the surface film forming and wear resistance performance and improve the flexibility and transparency of a product by optimizing and improving the components of each layer; form stable film strength; the strength of the polyurethane surface film is improved, and the abrasion resistance, the breaking property, the tension, the crack and other various strengths are enhanced along with the improvement of the strength of the polyurethane surface film. In addition, the polyurethane surface film also has excellent light aging resistant effect, and avoids the phenomena of peeling, cracking and the like of products after long-term sun exposure.
In order to achieve the aim, the invention provides a soft transparent polyurethane surface film which comprises a base cloth, an adhesive layer and a surface layer, wherein the adhesive layer is arranged between the base cloth and the surface layer; the base cloth and the surface layer are bonded and attached together through the adhesive layer.
The surface layer and the adhesive layer respectively comprise polyurethane, a bridging agent, a thickening agent, a leveling agent and a defoaming agent; the mass ratio of the surface layer, the adhesive layer and the base cloth is 2: 3: 3 to 5.
Further, the surface layer comprises the following material components in parts by weight: 100 parts of polyurethane, 5-10 parts of bridging agent, 0.5-1 part of flatting agent, 0.3-1 part of defoaming agent and 20-50 parts of thickening agent;
further, the bridging agent is a multifunctional carbodiimide polymer, the leveling agent is an organic silicon polymer, the thickening agent is an acrylic polymer, and the defoaming agent is an organic silicon polymer.
Further, the glue layer comprises the following material components in parts by weight: 100 parts of polyurethane, 5-10 parts of bridging agent, 0.5-1 part of flatting agent, 0.5-2 parts of defoaming agent and 30-80 parts of thickening agent;
further, the base cloth is formed by weaving polyester fibers in a circular weaving mode; the thickness of the base cloth is less than or equal to 300 mu m, and the mass surface density of the base cloth is 100g/m2～220g/m2。
In order to achieve the above object, the present invention also provides a method for preparing the polyurethane composite surface film, the method comprising the steps of:
s1, preparing a surface layer, wherein the surface layer preparation comprises the steps of preparing surface layer liquid, defoaming the surface layer liquid, coating the surface layer liquid on release paper, and drying and forming the surface layer to obtain the surface layer;
s2, preparing a glue layer, wherein the glue layer preparation comprises the steps of preparing glue layer liquid, coating the glue layer liquid on the surface layer obtained in the step S1, and drying and forming the glue layer to obtain the glue layer;
s3, bonding, namely bonding the adhesive layer obtained in the step S2 and the base cloth together to form a skin membrane blank;
s4, curing, namely curing the epidermis membrane blank in the step S3 in an oven and cooling to obtain a cured epidermis membrane blank;
s5, peeling, namely peeling the cured epidermal film blank in the step S4 from release paper to obtain the finished polyurethane epidermal film.
Preferably, the production environment temperature of the step S1 to the step S5 is 0 ℃ to 40 ℃, and the production environment humidity is 20% to 80%.
Further, the stirring speed of the surface layer liquid prepared in the step S1 is 720-880 rpm, the stirring time is 60-65 min, and the viscosity of the surface layer liquid is 3000-5000 cps.
Preferably, the treatment time of the surface layer liquid defoaming treatment in step S1 is 60 to 65 min; the negative pressure value of the negative pressure vacuum defoaming treatment is-90 kPa; stirring is carried out simultaneously with the defoaming treatment. The prepared surface layer liquid is defoamed by a circulating defoaming machine, the defoaming effect is fully ensured, and air is prevented from entering the surface layer liquid in the conveying process during recycling, so that the surface layer coating quality is improved.
Preferably, the coating speed of the surface layer liquid in the step S1 is 6 m/min-8 m/min, and the using amount is 50g/m2～70g/m2。
Preferably, the surface layer drying and forming temperature in the step S1 is 70-130 ℃, and the time is 25-35 min; the temperature is gradually increased from 70 ℃ to 130 ℃ by using a drying mode with gradually increased temperature.
Further, the stirring speed of the glue layer preparation liquid in the step S2 is 720 rpm-880 rpm.
Preferably, the coating speed of the glue line liquid in the step S2 is 6 m/min-8 m/min, and the using amount is 30g/m2～50g/m2。
Preferably, in the step S2, the drying and forming temperature of the adhesive layer is 70 to 90 ℃, the time is 25 to 35min, and the drying degree of the adhesive layer is 70 to 80%.
Furthermore, the speed of bonding in the step S3 is 6m/min to 8m/min, the pressure of bonding is 0.2MPa to 0.3MPa, and the gap of bonding is 0.1mm to 0.2 mm.
Further, the curing treatment temperature in the step S4 is 125-135 ℃, and the time is 70-90 min.
Compared with the prior art, the invention has the following beneficial effects:
1. the transparent polyurethane surface film comprises a base fabric, an adhesive layer and a surface layer, and the wear resistance, the fracture resistance and the transparency of each layer are enhanced by improving the components of each layer. In addition, the skin film also has excellent light aging resistant effect, and can avoid the phenomena of aging, peeling, cracks and the like of products after long-term sun exposure.
2. In addition, by a special preparation method, the surface layer of the material can enhance the surface film forming and abrasion resistance, improve the flexibility of the product and form stable film strength; particularly, the surface layer liquid in the step S1 is defoamed under vacuum negative pressure and is stirred at the same time, so that the defoaming effect is fully ensured, and air is prevented from entering the surface layer liquid in the conveying process during recycling, so that the surface layer coating quality is improved.
3. The transparent polyurethane surface film of the invention improves the strength and transparency of the surface film through the polyurethane raw material and the surface film structure of specific components, and the component performance and the preparation process of the product, thereby achieving the purpose of improving the service life of the product and improving the product competitiveness.
Drawings
FIG. 1 is a process flow diagram of a method for preparing a soft transparent polyurethane surface film according to the present invention;
FIG. 2 is a schematic cross-sectional view of a soft transparent polyurethane skin film according to the present invention;
the labels in the figure are: 1-base cloth, 2-adhesive layer and 3-surface layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, so that those skilled in the art can fully understand the technical contents of the present invention. It should be noted that the specific embodiments described herein are only for explaining the present invention and are not used to limit the present invention.
The invention provides a soft transparent polyurethane surface leather film and a preparation method thereof, the transparent polyurethane surface leather film comprises a base cloth 1, an adhesive layer 2 and a surface layer 3, wherein the adhesive layer 2 is arranged between the base cloth 1 and the surface layer 3; base cloth 1 and surface course 3 bond the laminating through glue film 2 and are in the same place, and the mass ratio of surface course 3, glue film 2, base cloth 1 is 2: 3: 3 to 5.
The surface layer 3 comprises polyurethane, a bridging agent, a thickening agent, a flatting agent and a defoaming agent, and the surface layer 3 comprises the following material components in parts by mass: 100 parts of polyurethane, 5-10 parts of bridging agent, 0.5-1 part of flatting agent, 0.3-1 part of defoaming agent and 20-50 parts of thickening agent; the bridging agent is multifunctional carbodiimide polymer, the leveling agent is organic silicon polymer, the thickening agent is acrylic polymer, and the defoaming agent is organic silicon polymer.
The adhesive layer 2 comprises polyurethane, a bridging agent, a thickening agent, a flatting agent and a defoaming agent, wherein the adhesive layer 2 comprises the following material components in parts by mass: 100 parts of polyurethane, 5-10 parts of bridging agent, 0.5-1 part of flatting agent, 0.5-2 parts of defoaming agent and 30-80 parts of thickening agent;
the base cloth 1 is formed by weaving polyester fibers in a circular weaving mode; the thickness of the base cloth is less than or equal to 300 mu m, and the mass surface density is 100g/m2～220g/m2。
The invention also provides a preparation method of the light, thin and flexible polyurethane surface film, which comprises the following steps:
s1, making a surface layer, wherein the making of the surface layer 3 comprises preparing surface layer liquid, defoaming the surface layer liquid, coating the surface layer liquid on release paper, and drying and forming the surface layer to obtain the surface layer 3; the stirring speed of the prepared surface layer liquid is 720-880 rpm, the stirring time is 60-65 min, and the viscosity of the surface layer liquid is 3000-5000 cps;
as a further improvement, the treatment time of the surface layer liquid defoaming treatment in the step S1 is 60min to 65 min; the negative pressure value of the negative pressure vacuum defoaming treatment is-90 kPa; stirring is carried out simultaneously with the defoaming treatment. The prepared surface layer liquid is defoamed by a circulating defoaming machine, the defoaming effect is fully ensured, and air is prevented from entering the surface layer liquid in the conveying process during recycling, so that the surface layer coating quality is improved. The coating speed of the surface layer liquid is 6 m/min-8 m/min, and the using amount is 50g/m2～70g/m2(ii) a The surface layer drying and forming temperature is 70-130 ℃, and the time is 25-35 min; and the temperature is gradually increased from 70 ℃ to 130 ℃ by using a drying mode with gradually increased temperature.
S2 preparing adhesive layer, adhesive layer 2 preparing including preparingCoating the glue layer liquid and the glue layer liquid on the surface layer obtained in the step S1, and drying and forming the glue layer to obtain a glue layer 2; the stirring speed of the prepared glue line liquid is 720 rpm-880 rpm, the coating processing speed of the glue line liquid is 6 m/min-8 m/min, and the using amount is 30g/m2～50g/m2(ii) a The drying and forming temperature of the adhesive layer is 70-90 ℃, the time is 25-35 min, and the drying degree of the adhesive layer is 70-80%.
S3, bonding, namely bonding the glue layer 2 obtained in the step S2 and the base cloth 1 together to form a skin membrane blank; the bonding speed is 6m/min to 8m/min, the bonding pressure is 0.2MPa to 0.3MPa, and the bonding gap is 0.1mm to 0.2 mm.
S4, curing, namely curing the epidermis membrane blank in the step S3 in an oven and cooling to obtain a cured epidermis membrane blank; the curing treatment temperature is 125-135 ℃, and the curing treatment time is 70-90 min.
S5, peeling, namely peeling the cured epidermal film blank in the step S4 from release paper to obtain the finished polyurethane epidermal film.
As a further improvement, the production environment temperature of the step S1 to the step S5 is 0 ℃ to 40 ℃, and the humidity is 20 percent to 80 percent.
Example 1:
this example provides a soft and transparent polyurethane skin film and a method for preparing the same,
preparing release paper and base cloth; the production environment temperature is 0-40 ℃, and the humidity is 20-80%;
s1, preparing a surface layer, namely selecting 100 parts of polyurethane, 5 parts of bridging agent carbodiimide polymer, 0.5 part of flatting agent organic silicon, 0.3 part of defoaming agent organic silicon polymer and 50 parts of thickening agent acrylic polymer according to the material components of the surface layer 3; the stirring speed of the prepared surface layer liquid is 720-880 rpm, the stirring time is 60-65 min, and the viscosity of the surface layer liquid is 3000 cps; the treatment time of the surface liquid defoaming treatment is 60-65 min; the negative pressure value of the negative pressure vacuum defoaming treatment is-90 kPa; stirring while defoaming; the coating speed of the surface layer liquid is 8m/min, and the usage amount is 70g/m2(ii) a The temperature of the surface layer drying and forming is 70 ℃At 130 ℃ for 25-35 min; and the temperature is gradually increased from 70 ℃ to 130 ℃ by using a drying mode with gradually increased temperature.
And (S2) preparing an adhesive layer: according to the material components of the glue layer 2, 100 parts of polyurethane, 10 parts of bridging agent, 0.5 part of flatting agent, 2 parts of defoaming agent and 80 parts of thickening agent are selected to prepare glue layer liquid; the stirring speed of the prepared glue line liquid is 720 rpm-880 rpm, the coating processing speed of the glue line liquid is 6m/min, and the using amount is 50g/m2(ii) a The drying and forming temperature of the adhesive layer is 90-110 ℃, the time is 25-35 min, and the drying degree of the adhesive layer is 70%.
S3, bonding, namely bonding the glue layer 2 obtained in the step S2 and the base cloth 1 together to form a skin membrane blank; the bonding speed is 7m/min, the bonding pressure is 0.2 MPa-0.3 MPa, and the bonding gap is 0.2 mm.
S4, curing, namely curing the epidermis membrane blank in the step S3 in an oven and cooling to obtain a cured epidermis membrane blank; the curing treatment temperature is 125-135 ℃, and the curing treatment time is 70-90 min.
S5, peeling, namely peeling the cured epidermal film blank in the step S4 from release paper to obtain the finished polyurethane epidermal film.
The performance of the thin and flexible polyurethane skin film prepared by the method is tested, and the results are shown in table 1. As can be seen from the comparative examples in table 1, the performance of the polyurethane composite epidermal film of the present invention is greatly improved, wherein the strength of the polyurethane composite epidermal film is increased by nearly one time, the transverse rupture strength is increased by nearly 3 times, the vertical rupture strength is increased by more than one time, and the transverse rupture elongation is increased by 30% under the same deformation condition.
Example 2:
the present example provides another soft transparent polyurethane skin film and a method for preparing the same, which are different from those of example 1 in that:
s1 preparation of surface layer, selecting 100 parts of polyurethane, 8 parts of bridging agent carbodiimide polymer, 0.8 part of flatting agent organic silicon, 0.7 part of defoaming agent organic silicon polymer, pigment inorganic pigment iron oxide and carbon black according to the material components of the surface layer 315 parts of thickening agent acrylic polymer 40 parts; the stirring speed of the prepared surface layer liquid is 720-880 rpm, the stirring time is 60-65 min, and the viscosity of the surface layer liquid is 4000 cps; the treatment time of the surface liquid defoaming treatment is 60-65 min; the negative pressure value of the negative pressure vacuum defoaming treatment is-90 kPa; stirring while defoaming; the coating speed of the surface layer liquid is 6m/min, and the usage amount is 50g/m2(ii) a The surface layer drying and forming temperature is 70-130 ℃, and the time is 25-35 min; and the temperature is gradually increased from 70 ℃ to 130 ℃ by using a drying mode with gradually increased temperature.
And (S2) preparing an adhesive layer: according to the material components of the glue layer 2, 100 parts of polyurethane, 7 parts of bridging agent, 1 part of flatting agent, 1.5 parts of defoaming agent and 60 parts of thickening agent are selected to prepare glue layer liquid; the stirring speed of the prepared glue line liquid is 720 rpm-880 rpm, the coating processing speed of the glue line liquid is 7m/min, and the using amount is 40g/m2(ii) a The drying and forming temperature of the adhesive layer is 90-110 ℃, the time is 25-35 min, and the drying degree of the adhesive layer is 75%.
S3, bonding, namely bonding the glue layer 2 obtained in the step S2 and the base cloth 1 together to form a skin membrane blank; the bonding speed is 6m/min, the bonding pressure is 0.2 MPa-0.3 MPa, and the bonding gap is 0.15 mm.
The performance of the thin and flexible polyurethane skin film prepared by the method is tested, and the results are shown in table 1.
Example 3:
the present example provides a soft transparent polyurethane skin film and a method for preparing the same, which are different from example 1 in that:
s1, preparing a surface layer, namely selecting 100 parts of polyurethane, 7.5 parts of a bridging agent carbodiimide polymer, 0.9 part of a leveling agent organic silicon, 0.6 part of a defoaming agent organic silicon polymer, 10-20 parts of pigment inorganic pigment iron oxide and carbon black and 20-50 parts of a thickening agent acrylic polymer according to the material components of the surface layer 3; the stirring speed of the prepared surface layer liquid is 720-880 rpm, the stirring time is 60-65 min, and the viscosity of the surface layer liquid is 5000 cps; the treatment time of the surface liquid defoaming treatment is 60-65 min; negative pressure vacuum defoaming placeThe negative pressure value of the device is-90 kPa; stirring while defoaming; the coating speed of the surface layer liquid is 8m/min, and the usage amount is 60g/m2(ii) a The surface layer drying and forming temperature is 70-130 ℃, and the time is 25-35 min; and the temperature is gradually increased from 70 ℃ to 130 ℃ by using a drying mode with gradually increased temperature.
And (S2) preparing an adhesive layer: according to the material components of the glue layer 2, 100 parts of polyurethane, 5 parts of bridging agent, 0.8 part of flatting agent, 1 part of defoaming agent and 30 parts of thickening agent are selected to prepare glue layer liquid; the stirring speed of the prepared glue line liquid is 720 rpm-880 rpm, the coating processing speed of the glue line liquid is 6m/min, and the using amount is 30g/m2(ii) a The drying and forming temperature of the adhesive layer is 90-110 ℃, the time is 25-35 min, and the drying degree of the adhesive layer is 80%.
S3, bonding, namely bonding the glue layer 2 obtained in the step S2 and the base cloth 1 together to form a skin membrane blank; the bonding speed is 6.5m/min, the bonding pressure is 0.2 MPa-0.3 MPa, and the bonding gap is 0.1 mm.
The performance of the thin and flexible polyurethane skin film prepared by the method is tested, and the results are shown in table 1.
Table 1 table for testing the performance of thin and flexible polyurethane skin
Through the above examples, we can see that the performance of the polyurethane composite epidermal film of the present invention is greatly improved, wherein under the same deformation condition, the strength of the polyurethane composite epidermal film is increased by nearly one time, the transverse breaking strength is increased by nearly 3 times, the vertical breaking strength is increased by more than one time, and the transverse breaking elongation is increased by 30%. Has wide application prospect.
It should be noted that the above-mentioned preferred embodiments are merely illustrative of the technical concepts and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The utility model provides a gentle transparent type polyurethane epidermis involucra, includes base cloth (1), glue film (2) and surface course (3), its characterized in that: a glue layer (2) is arranged between the base cloth (1) and the surface layer (3); base cloth (1) with surface course (3) pass through glue film (2) bond-bonding together, the mass ratio of surface course (3), glue film (2) and base cloth (1) is 2: 3: 3 to 5.
2. A light clear polyurethane skin film according to claim 1, wherein: the surface layer (3) and the glue layer (2) both comprise polyurethane, a bridging agent, a thickening agent, a leveling agent and a defoaming agent.
3. A soft transparent polyurethane skin film according to claim 1 or 2, wherein: the surface layer (3) comprises the following material components in parts by weight: 100 parts of polyurethane, 5-10 parts of bridging agent, 0.5-1 part of flatting agent, 0.3-1 part of defoaming agent and 20-50 parts of thickening agent.
4. A soft transparent polyurethane skin film according to claim 1 or 2, wherein: the adhesive layer (2) comprises the following material components in parts by weight: 100 parts of polyurethane, 5-10 parts of bridging agent, 0.5-1 part of flatting agent, 0.5-2 parts of defoaming agent and 30-80 parts of thickening agent.
5. A soft, clear polyurethane skin film according to claim 4, wherein: the bridging agent is a multifunctional carbodiimide polymer, the leveling agent is organic silicon, the thickening agent is an acrylic polymer, and the defoaming agent is an organic silicon polymer.
6. A preparation method of a soft transparent polyurethane surface film is characterized by comprising the following steps:
s1, making a surface layer, wherein the making of the surface layer (3) comprises preparing surface layer liquid, defoaming the surface layer liquid, coating the surface layer liquid on release paper, and drying and forming the surface layer;
s2, manufacturing a glue layer, wherein the manufacturing of the glue layer (2) comprises preparing glue layer liquid, coating the glue layer liquid on the surface layer obtained in the step S1, and drying and forming the glue layer;
s3, bonding, namely bonding the glue layer (2) obtained in the step S2 and the base cloth (1) together to form a skin membrane blank;
s4, curing, namely curing the epidermis membrane blank in the step S3 in an oven and cooling to obtain a cured epidermis membrane blank;
s5, peeling, namely peeling the cured epidermal film blank in the step S4 from release paper to obtain the finished polyurethane epidermal film.
7. The method of claim 6, wherein the method further comprises:
the stirring speed of the prepared surface layer liquid in the step S1 is 720-880 rpm, the stirring time is 60-65 min, and the viscosity of the surface layer liquid is 3000-5000 cps.
8. The method of claim 6, wherein the method further comprises:
the treatment time of the surface layer liquid defoaming treatment is 60-65 min; the negative pressure value of the negative pressure vacuum defoaming treatment is-90 kPa, and the defoaming treatment is carried out while stirring; the coating processing speed of the surface layer liquid is 6-8 m/min, and the using amount is 50g/m2～70g/m2(ii) a The surface layer drying and forming temperature is 70-130 ℃, and the time is 25-35 min.
9. The method of claim 6, wherein the method further comprises:
the stirring speed of the prepared glue line liquid in the step S2 is 720rpm to 880rpm, the coating speed of the glue line liquid is 6m/min to 8m/min, and the using amount is 30g/m2～50g/m2(ii) a The drying and forming temperature of the adhesive layer is 90-110 ℃, the drying time is 25-35 min, and the drying degree of the adhesive layer is 70-80%.
10. The method of claim 6, wherein the method further comprises:
the speed of bonding in the step S3 is 6m/min to 8m/min, the bonding pressure is 0.2MPa to 0.3MPa, and the bonding gap is 0.1mm to 0.2 mm.
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