CN111764179A - Environment-friendly antibacterial artificial leather - Google Patents
Environment-friendly antibacterial artificial leather Download PDFInfo
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- CN111764179A CN111764179A CN202010484164.1A CN202010484164A CN111764179A CN 111764179 A CN111764179 A CN 111764179A CN 202010484164 A CN202010484164 A CN 202010484164A CN 111764179 A CN111764179 A CN 111764179A
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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
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/04—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 by reactions only involving carbon-to-carbon unsaturated bonds
- D06N3/06—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 by reactions only involving carbon-to-carbon unsaturated bonds with polyvinylchloride or its copolymerisation products
- D06N3/08—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 by reactions only involving carbon-to-carbon unsaturated bonds with polyvinylchloride or its copolymerisation products with a finishing layer consisting of polyacrylates, polyamides or polyurethanes or polyester
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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
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0043—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by their foraminous structure; Characteristics of the foamed layer or of cellular layers
-
- 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
- D06N3/0088—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 directly applying the resin
-
- 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
-
- 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
- D06N2209/1671—Resistance to bacteria, mildew, mould, fungi
-
- 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
Abstract
The invention discloses environment-friendly antibacterial artificial leather, and relates to the technical field of artificial leather. The water-based polyurethane coating comprises a surface layer and a surface layer, wherein the surface layer is provided with a water-based polyurethane coating layer, and the components of the water-based polyurethane coating layer contain a silver ion antibacterial agent; the silver ion antibacterial agent consists of silver ions and water, the concentration is 0.2% -3%, the PH value is 8-10, and the weight ratio of the waterborne polyurethane to the silver ion antibacterial agent is 100: 0.5-5. The silver ion antibacterial agent adopted by the invention has good dispersibility in the surface treatment agent used for the waterborne polyurethane coating layer, so that the silver ion antibacterial agent has excellent antibacterial effect and excellent rubbing color fastness.
Description
Technical Field
The invention relates to the technical field of artificial leather, in particular to antibacterial artificial leather and a preparation method thereof.
Background
Along with the growth of world population and the rapid development of economy, natural leather can not meet the normal requirements of people, and synthetic leather has high cost performance, can be designed and processed strongly, is easy to produce in batches, can replace natural leather in many aspects, and is widely applied to industries such as clothing, shoemaking, cases, furniture, automotive interiors and the like.
With the improvement of living standard, the functional requirements of consumers on artificial leather are higher and higher, for example, artificial leather is required to have certain antibacterial function on the premise of having conventional functions.
At present, some artificial leathers with antibacterial function are available on the market, and although the artificial leathers have certain antibacterial property, the artificial leathers have antibacterial function and bring some considerable disadvantages due to the immaturity of the prior art. For example, some antibacterial artificial leathers achieve antibacterial effect by adding isothiazolinone series organic antibacterial agents or powdered nano silver antibacterial agents to one of the surface layer, the bubble layer, the surface layer and the base cloth of the PVC leather, but if the isothiazolinone series organic antibacterial agents are added, the antibacterial artificial leathers are easy to volatilize and lose efficacy due to high temperature (the plasticizing temperature is usually 180 ℃ to 210 ℃) during the plasticizing process of the artificial leather production, and have poor antibacterial effect, so that the antibacterial purpose is difficult to be really achieved; if the powdery nano-silver antibacterial agent is added, the powdery nano-silver antibacterial agent is in a powdery granular shape, so that the powdery nano-silver antibacterial agent is not well dispersed when being added into the surface layer water-based PU surface treatment agent, so that the surface of the artificial leather has poor friction color fastness and is easy to separate out and fade.
Disclosure of Invention
The invention provides environment-friendly antibacterial artificial leather, which can enable the artificial leather to have an antibacterial function and meet the requirement on rubbing color fastness.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the antibacterial agent comprises a surface layer, wherein a waterborne polyurethane coating layer is arranged on the surface layer, and the components of the waterborne polyurethane coating layer contain a silver ion antibacterial agent.
In the above technical solution, a more specific solution may also be: the silver ion antibacterial agent consists of silver ions and water, the concentration is 0.2% -3%, and the pH value is 8-10.
Further, the weight ratio of the waterborne polyurethane to the silver ion antibacterial agent is 100: 0.5-5.
Further, the coating layer component also comprises a cross-linking agent, and the cross-linking agent is one or a mixture of more of modified water-based aziridine, polycarbodiimide and polyisocyanate.
Further, the weight ratio of the waterborne polyurethane to the cross-linking agent is 100: 1-5.
Further, the preparation method comprises the following steps:
A. coating a PVC surface layer on release paper, and drying in a first-stage drying oven;
B. coating a PVC foaming layer on the surface layer obtained in the step A, and entering a two-section drying oven for foaming and drying;
C. b, coating an adhesive on the foaming layer obtained in the step B, adhering base cloth, drying in a three-section drying oven, and separating from the release paper to obtain artificial leather;
D. and C, roll coating one or more aqueous polyurethane coating layers containing silver ion antibacterial agents on the surface layer of the artificial leather obtained in the step C by using a printing machine, and drying in a four-section drying oven.
Further, in the step A, the coating thickness of the surface layer is 0.18 mm-0.3 mm, and the temperature of the first section of oven is 150-180 ℃;
in the step B, the scraping thickness of the foaming layer is 0.2-0.5 mm, and the temperature of the two-section drying oven is 140-170 ℃;
in the step C, coating a scraped adhesive layer on the foaming layer, wherein the gluing amount is 70 g/m2～100g/m2The temperature of the three-section drying oven is 180-210 ℃;
in the step D, the surface layer is roll-coated by the printer, one plate is coated by an anilox roll with 100-120 meshes, and the feeding amount is 18g/m2～30g/m2Then the mixture enters a drying oven to be dried; the two plates are coated with anilox roller of 150-170 meshes with a feeding amount of 12g/m2～18g/m2Then the mixture enters a drying oven to be dried;the three plates use an anilox roller with 180 meshes to 200 meshes, and the feeding amount is 8g/m2～12g/m2And drying in an oven at 100-140 deg.c.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts silver ions with better high temperature resistance as the antibacterial agent of the artificial leather, which shows more stable antibacterial function in the production process of the artificial leather, thereby overcoming the problems of easy volatilization and invalidation and poor antibacterial effect caused by high temperature (the plasticizing temperature is usually 180-210 ℃) when the prior isothiazolinone series organic antibacterial agent is plasticized in the production process of the artificial leather; meanwhile, the silver ion antibacterial agent adopted by the invention has good dispersibility in the surface treatment agent used for the waterborne polyurethane coating layer, so that the antibacterial agent has excellent antibacterial effect and excellent rubbing color fastness, and the problems of poor surface rubbing color fastness, easy precipitation and color loss of artificial leather when the existing powdery nano silver antibacterial agent is applied to the artificial leather are solved.
2. The waterborne polyurethane coating uses waterborne polyurethane as a surface treating agent of the waterborne polyurethane coating, does not contain organic solvent, and is safe and environment-friendly.
3. The dispersibility of the silver ion antibacterial agent in the surface treatment agent of the waterborne polyurethane coating layer is ensured by limiting the pH value of the silver ion antibacterial agent to be 8-10; if the pH is less than 8, the aqueous surface treatment agent precipitates and cannot be used.
4. The invention ensures that the waterborne polyurethane coating layer has excellent antibacterial property and rubbing color fastness at the same time by limiting 100: 0.5-5 parts of the waterborne polyurethane and the silver ion antibacterial agent; if the ratio of the silver ion antibacterial agent to the silver ion antibacterial agent is less than 0.5, the antibacterial effect is insufficient, and if the ratio of the silver ion antibacterial agent to the silver ion antibacterial agent is more than 5, the friction color fastness is unqualified, and the phenomena of precipitation and fading occur.
5. The product of the invention has antibacterial effect, the antibacterial rate of ATCC 8739 escherichia coli is 99.99%, and the antibacterial rate of ATCC6538P staphylococcus aureus is 99.99%.
3. The product of the invention has excellent friction color fastness performance: wet grinding 300 times 4-5 grades, alkaline sweat 200 times 4-5 grades, and analyzing pure alcohol 10 times 4-5 grades.
4. The preparation method provided by the invention is simple to operate, mature in process and easy for industrial production.
Detailed Description
The invention is further described in detail below with reference to examples:
example 1
80kg of plasticizer and 3kg of heat stabilizer are sequentially added into a 300L stirring barrel, 100kg of PVC paste resin and 5kg of color paste and other additives are added while stirring, stirring is carried out for 20 minutes, and defoaming is carried out for 30 minutes under-0.1 MPa by using a vacuum stirring defoaming machine, so as to obtain the shell fabric.
160kg of plasticizer, 60kg of inorganic filler and 6kg of heat stabilizer are sequentially added into a 300L stirring barrel, 200kg of PVC paste resin, 10kg of color paste and other additives and 6kg of foaming agent are added while stirring, and the mixture is stirred for 30 minutes to obtain the foaming layer material.
60kg of plasticizer and 3kg of heat stabilizer were sequentially added to a 300L stirring tank, 100kg of PVC paste resin was further added while stirring, and stirring was carried out for 20 minutes to obtain an adhesive layer material.
30kg of the aqueous polyurethane coating agent was put into a 50L stirring tank, 0.9kg of a silver ion antibacterial agent having a pH of 8, 1.2kg of a crosslinking agent and 1.5kg of other auxiliary agents were further added while stirring, and the mixture was stirred for 15 minutes, followed by adjusting the viscosity of the coating agent to 300MPa.s with deionized water to obtain an antibacterial aqueous PU coating agent.
The production line speed of the coating and scraping line is 12m/min, release paper is used as a carrier, a coating head is used for coating and scraping surface layer paste with the thickness of 0.25mm, and the temperature of a first section of an oven is 160 ℃; the second coating head is used for coating and scraping foam layer paste with the thickness of 0.32mm, and the temperature of a second section oven is 180 ℃; and (3) coating a water-borne polyurethane adhesive on the three coating heads, wherein the gluing amount is 80g/m2, then adhering knitted fabric base cloth, controlling the temperature of a three-section oven to be 210 ℃, and finally cooling and rolling to obtain the artificial leather.
Performing surface treatment on the obtained artificial leather by using a printer, roll-coating an aqueous PU finishing agent added with a silver ion antibacterial agent on the obtained artificial leather, feeding the artificial leather into an oven at 100 ℃ by using a 120-mesh screen roller, wherein the feeding amount is 18g/m 2; the second plate is dried in an oven at 140 ℃ by using a 150-mesh screen roller with the feeding amount of 15g/m 2; the three plates are dried in an oven at 140 ℃ with a linear speed of 10m/min by using a 180-mesh screen roller and a feeding amount of 12g/m 2.
Embossing the artificial leather by using an embossing machine or a vacuum embossing machine to obtain the artificial leather with the antibacterial function.
Example 2
80kg of plasticizer and 3kg of heat stabilizer are sequentially added into a 300L stirring barrel, 100kg of PVC paste resin, 1kg of nano-silver antibacterial agent, 5kg of color paste and other additives are added while stirring, stirring is carried out for 20 minutes, and defoaming is carried out for 30 minutes under-0.1 MPa by using a vacuum stirring defoaming machine to obtain the shell fabric.
160kg of inorganic filler, 60kg of inorganic filler and 6kg of heat stabilizer are sequentially added into a 300L stirring barrel, 200kg of PVC paste resin, 10kg of color paste and other auxiliary agents and 6kg of foaming agent are added while stirring, and the mixture is stirred for 30 minutes to obtain the foaming layer material.
60kg of plasticizer and 3kg of heat stabilizer were sequentially added to a 300L stirring tank, 100kg of PVC paste resin was further added while stirring, and stirring was carried out for 20 minutes to obtain an adhesive layer material.
30kg of the aqueous polyurethane coating agent was put into a 50L stirring tank, 1.5kg of a silver ion antibacterial agent having a pH of 8 and 1.2kg of a crosslinking agent were further added under stirring for 15 minutes, and the viscosity of the coating agent was adjusted to 300MPa.s by adding deionized water to obtain an antibacterial aqueous PU coating agent.
The production line speed of the coating and scraping line is 12m/min, release paper is used as a carrier, a coating head is used for coating and scraping surface layer paste with the thickness of 0.25mm, and the temperature of a first section of an oven is 160 ℃; the second coating head is used for coating and scraping foam layer paste with the thickness of 0.32mm, and the temperature of a second section oven is 180 ℃; and (3) coating a water-borne polyurethane adhesive on the three coating heads, wherein the gluing amount is 80g/m2, then adhering knitted fabric base cloth, controlling the temperature of a three-section oven to be 210 ℃, and finally cooling and rolling to obtain the artificial leather.
Performing surface treatment on the obtained artificial leather by using a printer, roll-coating an aqueous PU finishing agent added with a silver ion antibacterial agent on the obtained artificial leather, feeding the artificial leather into an oven at 100 ℃ by using a 120-mesh screen roller, wherein the feeding amount is 18g/m 2; the second plate is dried in an oven at 140 ℃ by using a 150-mesh screen roller with the feeding amount of 15g/m 2; the three plates are dried in an oven at 140 ℃ with a linear speed of 10m/min by using a 180-mesh screen roller and a feeding amount of 12g/m 2.
Embossing the artificial leather by using an embossing machine or a vacuum embossing machine to obtain the artificial leather with the antibacterial function.
Example 3
80kg of plasticizer and 3kg of heat stabilizer are sequentially added into a 300L stirring barrel, 100kg of PVC paste resin and 5kg of color paste and other additives are added while stirring, stirring is carried out for 20 minutes, and defoaming is carried out for 30 minutes under-0.1 MPa by using a vacuum stirring defoaming machine, so as to obtain the shell fabric.
160kg of plasticizer, 60kg of inorganic filler and 6kg of heat stabilizer are sequentially added into a 300L stirring barrel, 200kg of PVC paste resin, 10kg of color paste and other additives and 6kg of foaming agent are added while stirring, and the mixture is stirred for 30 minutes to obtain the foaming layer material.
60kg of plasticizer and 3kg of heat stabilizer are sequentially added into a 300L stirring barrel, 100kg of PVC paste resin is added while stirring, the mixture is stirred for 20 minutes, and a vacuum stirring defoaming machine is used for defoaming at-0.1 MPa for 30 minutes to obtain the shell fabric.
30kg of the aqueous polyurethane coating agent was put into a 50L stirring tank, 0.15kg of a silver ion antibacterial agent having a pH of 10, 1.2kg of a crosslinking agent and 1.5kg of other auxiliary agents were further added while stirring, and the mixture was stirred for 15 minutes, followed by adjusting the viscosity of the coating agent to 300MPa.s with deionized water to obtain an antibacterial aqueous PU coating agent.
The production line speed of the coating and scraping line is 12m/min, release paper is used as a carrier, a coating head is used for coating and scraping surface layer paste with the thickness of 0.25mm, and the temperature of a first section of an oven is 160 ℃; the second coating head is used for coating and scraping foam layer paste with the thickness of 0.32mm, and the temperature of a second section oven is 180 ℃; and (3) coating a water-borne polyurethane adhesive on the three coating heads, wherein the gluing amount is 80g/m2, then adhering knitted fabric base cloth, controlling the temperature of a three-section oven to be 210 ℃, and finally cooling and rolling to obtain the artificial leather.
Performing surface treatment on the obtained artificial leather by using a printer, roll-coating an aqueous PU finishing agent added with a silver ion antibacterial agent on the obtained artificial leather, feeding the artificial leather into an oven at 100 ℃ by using a 120-mesh screen roller, wherein the feeding amount is 18g/m 2; the second plate is dried in an oven at 140 ℃ by using a 150-mesh screen roller with the feeding amount of 15g/m 2; the three plates are dried in an oven at 140 ℃ with a linear speed of 10m/min by using a 180-mesh screen roller and a feeding amount of 12g/m 2.
Embossing the artificial leather by using an embossing machine or a vacuum embossing machine to obtain the artificial leather with the antibacterial function.
Comparative example 1
80kg of plasticizer and 3kg of heat stabilizer are sequentially added into a 300L stirring barrel, 100kg of PVC paste resin and 5kg of color paste and other additives are added while stirring, stirring is carried out for 20 minutes, and defoaming is carried out for 30 minutes under-0.1 MPa by using a vacuum stirring defoaming machine, so as to obtain the shell fabric.
160kg of plasticizer, 60kg of inorganic filler and 6kg of heat stabilizer are sequentially added into a 300L stirring barrel, 200kg of PVC paste resin, 10kg of color paste and other additives and 6kg of foaming agent are added while stirring, and the mixture is stirred for 30 minutes to obtain the foaming layer material.
60kg of plasticizer and 3kg of heat stabilizer were sequentially added to a 300L stirring tank, 100kg of PVC paste resin was further added while stirring, and stirring was carried out for 20 minutes to obtain an adhesive layer material.
30kg of the aqueous polyurethane coating agent was put into a 50L stirring tank, 1.2kg of the crosslinking agent and 1.5kg of the other auxiliary agents were further added while stirring, and the mixture was stirred for 15 minutes, followed by adjusting the coating agent viscosity to 300MPa.s with deionized water to obtain an aqueous PU coating agent.
The production line speed of the coating and scraping line is 12m/min, release paper is used as a carrier, a coating head is used for coating and scraping surface layer paste with the thickness of 0.25mm, and the temperature of a first section of an oven is 160 ℃; the second coating head is used for coating and scraping foam layer paste with the thickness of 0.32mm, and the temperature of a second section oven is 180 ℃; and (3) coating a water-borne polyurethane adhesive on the three coating heads, wherein the gluing amount is 80g/m2, then adhering knitted fabric base cloth, controlling the temperature of a three-section oven to be 210 ℃, and finally cooling and rolling to obtain the artificial leather.
Performing surface treatment on the obtained artificial leather by using a printer, roll-coating the water-based PU coating agent on the obtained artificial leather, feeding the artificial leather into an oven at 100 ℃ by using a 120-mesh screen roller with the feeding amount of 18g/m 2; the second plate is dried in an oven at 140 ℃ by using a 150-mesh screen roller with the feeding amount of 15g/m 2; the three plates are dried in an oven at 140 ℃ with a linear speed of 10m/min by using a 180-mesh screen roller and a feeding amount of 12g/m 2.
Embossing the artificial leather by using an embossing machine or a vacuum embossing machine to obtain the artificial leather with the antibacterial function.
Comparative example 2
80kg of plasticizer and 3kg of heat stabilizer are sequentially added into a 300L stirring barrel, 100kg of PVC paste resin and 5kg of color paste are added while stirring, stirring is carried out for 20 minutes, and defoaming is carried out for 30 minutes under-0.1 MPa by using a vacuum stirring defoaming machine, so as to obtain the shell fabric.
160kg of plasticizer, 60kg of inorganic filler and 6kg of heat stabilizer are sequentially added into a 300L stirring barrel, 200kg of PVC paste resin, 10kg of color paste and 6kg of foaming agent are added while stirring, the mixture is stirred for 30 minutes, and a vacuum stirring defoaming machine is used for defoaming at-0.1 MPa for 30 minutes to obtain the foaming layer material.
60kg of plasticizer and 3kg of heat stabilizer are sequentially added into a 300L stirring barrel, 100kg of PVC paste resin is added while stirring, the mixture is stirred for 20 minutes, and a vacuum stirring defoaming machine is used for defoaming at-0.1 MPa for 30 minutes to obtain the shell fabric.
30kg of the aqueous polyurethane coating agent was put into a 50L stirring tank, 1.8kg of a silver ion antibacterial agent having a pH of 10 and 1.2kg of a crosslinking agent were further added while stirring, and the mixture was stirred for 15 minutes, followed by adjusting the viscosity of the coating agent to 300MPa.s with deionized water to obtain an antibacterial aqueous PU coating agent.
The production line speed of the coating and scraping line is 12m/min, release paper is used as a carrier, a coating head is used for coating and scraping surface layer paste with the thickness of 0.25mm, and the temperature of a first section of an oven is 160 ℃; the second coating head is used for coating and scraping foam layer paste with the thickness of 0.32mm, and the temperature of a second section oven is 180 ℃; and (3) coating a water-borne polyurethane adhesive on the three coating heads, wherein the gluing amount is 80g/m2, then adhering knitted fabric base cloth, controlling the temperature of a three-section oven to be 210 ℃, and finally cooling and rolling to obtain the artificial leather.
Performing surface treatment on the obtained artificial leather by using a printer, roll-coating an aqueous PU finishing agent added with a silver ion antibacterial agent on the obtained artificial leather, feeding the artificial leather into an oven at 100 ℃ by using a 120-mesh screen roller, wherein the feeding amount is 18g/m 2; the second plate is dried in an oven at 140 ℃ by using a 150-mesh screen roller with the feeding amount of 15g/m 2; the three plates are dried in an oven at 140 ℃ with a linear speed of 10m/min by using a 180-mesh screen roller and a feeding amount of 12g/m 2.
Embossing the artificial leather by using an embossing machine or a vacuum embossing machine to obtain the artificial leather with the antibacterial function.
Comparative example 3
80kg of plasticizer and 3kg of heat stabilizer are sequentially added into a 300L stirring barrel, 100kg of PVC paste resin and 5kg of color paste are added while stirring, stirring is carried out for 20 minutes, and defoaming is carried out for 30 minutes under-0.1 MPa by using a vacuum stirring defoaming machine, so as to obtain the shell fabric.
160kg of plasticizer, 60kg of inorganic filler and 6kg of heat stabilizer are sequentially added into a 300L stirring barrel, 200kg of PVC paste resin, 10kg of color paste and 6kg of foaming agent are added while stirring, the mixture is stirred for 30 minutes, and a vacuum stirring defoaming machine is used for defoaming at-0.1 MPa for 30 minutes to obtain the foaming layer material.
60kg of plasticizer and 3kg of heat stabilizer are sequentially added into a 300L stirring barrel, 100kg of PVC paste resin is added while stirring, the mixture is stirred for 20 minutes, and a vacuum stirring defoaming machine is used for defoaming at-0.1 MPa for 30 minutes to obtain the shell fabric.
30kg of the aqueous polyurethane coating agent was put into a 50L stirring tank, 0.09kg of the silver ion antibacterial agent having a pH of 10 and 1.2kg of the crosslinking agent were further added while stirring, and the mixture was stirred for 15 minutes, followed by adjusting the viscosity of the coating agent to 300MPa.s with deionized water to obtain an antibacterial aqueous PU coating agent.
The production line speed of the coating and scraping line is 12m/min, release paper is used as a carrier, a coating head is used for coating and scraping surface layer paste with the thickness of 0.25mm, and the temperature of a first section of an oven is 160 ℃; the second coating head is used for coating and scraping foam layer paste with the thickness of 0.32mm, and the temperature of a second section oven is 180 ℃; and (3) coating a water-borne polyurethane adhesive on the three coating heads, wherein the gluing amount is 80g/m2, then adhering knitted fabric base cloth, controlling the temperature of a three-section oven to be 210 ℃, and finally cooling and rolling to obtain the artificial leather.
Performing surface treatment on the obtained artificial leather by using a printer, roll-coating an aqueous PU finishing agent added with a silver ion antibacterial agent on the obtained artificial leather, feeding the artificial leather into an oven at 100 ℃ by using a 120-mesh screen roller, wherein the feeding amount is 18g/m 2; the second plate is dried in an oven at 140 ℃ by using a 150-mesh screen roller with the feeding amount of 15g/m 2; the three plates are dried in an oven at 140 ℃ with a linear speed of 10m/min by using a 180-mesh screen roller and a feeding amount of 12g/m 2.
Embossing the artificial leather by using an embossing machine or a vacuum embossing machine to obtain the artificial leather with the antibacterial function.
Comparative example 4
80kg of plasticizer and 3kg of heat stabilizer are sequentially added into a 300L stirring barrel, 100kg of PVC paste resin and 5kg of color paste are added while stirring, stirring is carried out for 20 minutes, and defoaming is carried out for 30 minutes under-0.1 MPa by using a vacuum stirring defoaming machine, so as to obtain the shell fabric.
160kg of plasticizer, 60kg of inorganic filler and 6kg of heat stabilizer are sequentially added into a 300L stirring barrel, 200kg of PVC paste resin, 10kg of color paste and 6kg of foaming agent are added while stirring, the mixture is stirred for 30 minutes, and a vacuum stirring defoaming machine is used for defoaming at-0.1 MPa for 30 minutes to obtain the foaming layer material.
60kg of plasticizer and 3kg of heat stabilizer are sequentially added into a 300L stirring barrel, 100kg of PVC paste resin is added while stirring, the mixture is stirred for 20 minutes, and a vacuum stirring defoaming machine is used for defoaming at-0.1 MPa for 30 minutes to obtain the shell fabric.
30kg of the aqueous polyurethane coating agent was put into a 50L stirring tank, and 1.8kg of a silver ion antibacterial agent having a pH of 6 and 1.2kg of a crosslinking agent were further added while stirring, and stirring was carried out for 15 minutes, whereby it was found that the silver ion antibacterial agent having a pH of 6 coagulated the aqueous polyurethane coating agent and could not be used.
Test part:
firstly, antibacterial performance testing:
1. after the sample is prepared, the antibacterial activity of ATCC 8739 Escherichia coli, ATCC6538P Staphylococcus aureus, is tested by GBT 31402-.
2. For the samples with and without the addition of the antibacterial agent, the antibacterial ratio was calculated and evaluated by: r (%) = (B-C)/B × 100; r antibacterial rate, B blank control sample average recovered bacteria number, C antibacterial plastic sample average recovered bacteria number.
3. The test results are shown in tables 1 and 2.
Second, rubbing color fastness test
The examples 1 to 3 and comparative examples 1 to 4 were subjected to the rubbing fastness test in the following manner, and the test results are shown in Table 2:
the test standard was ISO 105X 12, test wet rub 300 times, alkaline sweat rub 200 times, and analyze pure alcohol 10 times.
Table 1: results of the antibacterial property test
Note: 1. Uo: log of number of bacteria (CFU/cm 2) immediately after inoculation without addition of the antimicrobial agent sample (comparative example 1);
2. Ut: adding a log of the number of bacteria (CFU/cm 2) 24h after inoculation of the antibacterial treated sample (example 1);
at is the log of the number of bacteria (CFU/cm 2) At 24h after inoculation of the antibacterially treated sample (example 1);
r: antibacterial property values.
TABLE 2 antibacterial property and crocking fastness test results
It can be seen from tables 1 and 2 that the addition of silver ion antibacterial agent has obvious antibacterial effect, especially the addition of 0.5-5% of silver ion antibacterial agent has obvious antibacterial effect, and the rubbing color fastness result is grade 4-5; and 6% of antibacterial agent is added, although the antibacterial result is good, the friction color fastness grade is reduced to 3 grade; 0.3 percent of antibacterial agent is added, and the antibacterial performance is poor due to too small addition amount; the addition of silver ion aqueous solution antibacterial agent with pH value less than 8 can cause coagulation of the aqueous polyurethane finishing agent, and the aqueous polyurethane finishing agent cannot be used.
Claims (7)
1. The environment-friendly antibacterial artificial leather comprises a surface layer and is characterized in that: the surface layer is provided with a water-based polyurethane coating layer, and the components of the water-based polyurethane coating layer contain a silver ion antibacterial agent.
2. The environment-friendly antibacterial artificial leather according to claim 1, wherein: the silver ion antibacterial agent consists of silver ions and water, the concentration is 0.2% -3%, and the pH value is 8-10.
3. The environment-friendly antibacterial artificial leather according to claim 1 or 2, wherein:
the weight ratio of the waterborne polyurethane to the silver ion antibacterial agent is 100: 0.5-5.
4. The environment-friendly antibacterial artificial leather according to claim 3, wherein: the coating layer component also comprises a cross-linking agent, and the cross-linking agent is one or a mixture of more of modified water-based aziridine, polycarbodiimide and polyisocyanate.
5. The environment-friendly antibacterial artificial leather according to claim 4, wherein:
the weight ratio of the waterborne polyurethane to the cross-linking agent is 100: 1-5.
6. The environment-friendly antibacterial artificial leather according to claim 5, wherein the preparation method comprises the following steps:
A. coating a PVC surface layer on release paper, and drying in a first-stage drying oven;
B. coating a PVC foaming layer on the surface layer obtained in the step A, and entering a two-section drying oven for foaming and drying;
C. b, coating an adhesive on the foaming layer obtained in the step B, adhering base cloth, drying in a three-section drying oven, and separating from the release paper to obtain artificial leather;
D. and C, roll coating one or more aqueous polyurethane coating layers containing silver ion antibacterial agents on the surface layer of the artificial leather obtained in the step C by using a printing machine, and drying in a four-section drying oven.
7. The environment-friendly antibacterial artificial leather according to claim 6, wherein:
in the step A, the coating thickness of the surface layer is 0.18 mm-0.3 mm, and the temperature of the first section of oven is 150-180 ℃;
in the step B, the scraping thickness of the foaming layer is 0.2-0.5 mm, and the temperature of the two-section drying oven is 140-170 ℃;
in the step C, coating a scraped adhesive layer on the foaming layer, wherein the gluing amount is 70 g/m2～100g/m2The temperature of the three-section drying oven is 180-210 ℃;
in the step D, the surface layer is roll-coated by the printer, one plate is coated by an anilox roll with 100-120 meshes, and the feeding amount is 18g/m2～30g/m2Then the mixture enters a drying oven to be dried; the two plates are coated with anilox roller of 150-170 meshes with a feeding amount of 12g/m2～18g/m2Then the mixture enters a drying oven to be dried; the three plates use an anilox roller with 180 meshes to 200 meshes, and the feeding amount is 8g/m2～12g/m2And drying in an oven at 100-140 deg.c.
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