CN115538179A - Bio-based degradable impregnation coating scraping machine woven cloth polyurethane synthetic leather base blank - Google Patents
Bio-based degradable impregnation coating scraping machine woven cloth polyurethane synthetic leather base blank Download PDFInfo
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- CN115538179A CN115538179A CN202210680269.3A CN202210680269A CN115538179A CN 115538179 A CN115538179 A CN 115538179A CN 202210680269 A CN202210680269 A CN 202210680269A CN 115538179 A CN115538179 A CN 115538179A
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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
- D06N3/0002—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
- D06N3/0006—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 woven fabrics
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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
- D06N3/0002—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
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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
- D06N3/0002—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
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- 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
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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
- D06N3/0056—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
- D06N3/0063—Inorganic compounding ingredients, e.g. metals, carbon fibres, Na2CO3, metal layers; Post-treatment with inorganic compounds
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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
- D06N3/12—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
- D06N3/141—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 mixture of two or more polyurethanes in the same layer
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- 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
- D06N3/147—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 characterised by the isocyanates used
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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
- D06N2209/1607—Degradability
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- 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
A bio-based degradable impregnated scraping machine-woven cloth polyurethane synthetic leather bottom blank relates to the technical field of synthetic leather bottom blank preparation, wherein a base cloth of the bottom blank is woven by a cotton-polyester blended machine; the preparation steps of the bottom embryo are as follows: s1, pre-impregnation: pre-impregnating the base cloth by adopting pre-impregnated working slurry with biodegradability; s2, coating: coating the pre-impregnated base fabric by using biodegradable coating working slurry; s3, solidification: so that the polyurethane is solidified on the surface of the base cloth; s4, cleaning: washing the base cloth with clear water, and washing DMF; s5, preheating, ironing, drying and shaping the cleaned base cloth to obtain the bio-based degradable impregnated coating and scraping woven fabric polyurethane synthetic leather base blank. The impregnation, coating and scraping woven fabric polyurethane synthetic leather bottom blank prepared by the method disclosed by the invention is compatible with the excellent characteristics of natural leather, and also has the advantages of environmental protection and degradability, high working efficiency in the preparation process and high quality of the prepared synthetic leather bottom blank.
Description
Technical Field
The invention relates to the technical field of synthetic leather base blank preparation, in particular to a bio-based degradable woven cloth polyurethane synthetic leather base blank containing a dip-coating scraper.
Background
At present, because the leather has wide application, such as shoe and boot manufacture, furniture manufacture, case manufacture and the like, a large amount of various leathers are used, but the global protection of animals is increasingly strengthened at present, and the manufacture of natural leather has more serious environmental pollution. In order to meet the continuously improved environmental protection requirements at home and abroad and the increasingly enhanced health and safety requirements of consumers, the ecological synthetic leather is more and more favored. Therefore, the synthetic leather industry is more and more favored by investors as a new industry with a wide development prospect.
The raw materials used by the traditional polyurethane synthetic leather are all made of fossil materials, are general materials which are not degradable or are slowly degraded, are difficult to degrade when being discarded to the nature, and have uncontrollable degradation speed, so that the traditional polyurethane synthetic leather is convenient for people to live and causes serious pollution to the environment, and under the condition, the development of a quick and efficient degradable material is urgently required to solve the problem.
Aiming at the problems, the invention provides a bio-based degradable impregnation coating scraping machine woven cloth polyurethane synthetic leather base blank.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a bio-based degradable woven cloth polyurethane synthetic leather bottom blank containing a dip-coating scraper, which greatly improves the degradation speed of the synthetic leather bottom blank and has great significance for environmental protection, and the specific scheme is as follows:
a bio-based degradable impregnation coating scraping machine woven cloth polyurethane synthetic leather bottom blank is characterized in that a cotton-polyester blended machine woven cloth is selected as base cloth of the bottom blank;
the preparation steps of the bottom blank are as follows:
s1, pre-impregnation: pre-impregnating the base cloth by adopting pre-impregnated working slurry with biodegradability;
s2, coating: coating the pre-impregnated base cloth by using coating working slurry with biodegradability;
s3, solidification: solidifying the polyurethane in the pre-impregnated coating slurry and the coating working slurry on the surface of the base cloth;
s4, cleaning: washing the base cloth with clean water, and washing DMF left in the base cloth;
and S5, conveying and preheating the base cloth cleaned in the step S4 in a drum type, pre-flattening while preheating, ironing, drying and shaping to obtain the woven polyurethane synthetic leather base blank of the bio-based degradable impregnation coating and scraping machine.
Further, the pre-impregnated working slurry in the step S1 is 80-100 parts of bio-based degradable polyurethane resin, 300-400 parts of DMF, and 5-10 parts of ultra-fine graphene.
Further, the preparation step of the pre-impregnated working slurry in the step S1 is: adding graphene and DMF into a vacuum stirring kettle, stirring at 25-30 ℃ at 500-800r/min for 20-30 minutes, adding bio-based degradable polyurethane resin, stirring at 1000-1500r/min for 30-40 minutes, then carrying out vacuum defoaming for 60-120 minutes, and finally filtering with a 100-mesh sieve to obtain the pre-impregnated working slurry.
Further, the coating working slurry in the step S2 is 60-70 parts of biodegradable polyurethane resin, 30-40 parts of common polyurethane resin, 100 parts of MF, 5-10 parts of carboxymethyl cellulose, 5-10 parts of ultra-fine graphene, 5-10 parts of ramie fiber and 2-5 parts of calcium gluconate.
Further, the step of preparing the coating working slurry in the step S2 includes: adding graphene, ramie fiber powder, carboxymethyl cellulose, calcium gluconate and DMF (dimethyl formamide) into a vacuum stirring kettle, stirring for 30 minutes at 500-800r/m, adding bio-based degradable resin, stirring for 60-120 minutes at 1000-1500r/m, defoaming for 60-120m in vacuum, and filtering by using a 180-200-mesh sieve to prepare coating working slurry for later use.
Furthermore, in the preheating process, a roller type preheating structure is adopted;
the roller type preheating structure comprises a conveying belt and two extruding rollers which are located at the upstream end and the downstream end of the conveying belt and matched with each other in a pairwise mode, a plurality of heating plates are arranged on the upper side and the lower side of the conveying belt, when the preheating structure is used for preheating, base cloth is flatly attached to the upstream end of the conveying belt and conveyed forwards through the conveying belt, and the base cloth is extruded and preheated through the upper roller and the lower roller.
Further, the flattening fan is obliquely arranged.
Further, in the washing process of step S4, the base cloth is placed in a temperature-rising environment or placed in an ultrasonic field for washing.
Further, the bio-based degradable polyurethane resin is bio-based modified polyurethane resin and consists of waterborne bio-based modified high-solid polyol and bio-based modified isocyanate, wherein the proportion of the waterborne bio-based modified high-solid polyol to the bio-based modified isocyanate is 2:3.
further, after fully mixing the waterborne bio-based modified high-solid polyol and the bio-based modified isocyanate according to the proportion, baking the mixture for 10min at the temperature of 115 ℃ to prepare the bio-based modified polyurethane resin.
Compared with the prior art, the invention has the following beneficial effects:
(1) The impregnation coating scraping machine weaving polyurethane synthetic leather bottom blank prepared by the preparation steps and the formula effectively improves the content of organic substances, reduces the content of heavy metals and DMF, has the excellent characteristics of natural leather, also has the performances of environmental protection and degradation, has good aging resistance, greatly improves the degradation speed of the whole synthetic leather bottom blank due to the increase of the content of organic substances, and has great significance for environmental protection;
(2) Through adopting the roller formula to preheat the structure at preheating the in-process, can not only carry the limit to preheat, and under the dual function of upper and lower double-roller and flat-open fan, realized carrying the flattening effect of the in-process of preheating to the base cloth, can not only improve the roughness of base cloth for preheat the effect, can also do well the basis for subsequent flat work of scalding, improved the efficiency that the synthetic leather made on the whole, further improved the quality of the synthetic leather that makes.
Detailed Description
The present invention will be described in further detail with reference to examples, but the present invention is not limited to these examples.
Synthetic leather is a plastic product which simulates the composition and structure of natural leather and can be used as a substitute material, and is usually prepared by taking impregnated non-woven fabric as a net layer and a microporous polyurethane layer as a grain surface layer in the preparation process of the synthetic leather. But the existing synthetic leather is not easy to degrade and has great influence on the environment.
Therefore, the application provides a bio-based degradable impregnated scratch-off woven fabric polyurethane synthetic leather bottom blank.
Example 1
A bio-based degradable impregnation coating scraping machine woven cloth polyurethane synthetic leather bottom blank, wherein a cotton-polyester blended machine woven cloth is selected as a base cloth of the bottom blank;
the preparation steps of the bottom embryo are as follows:
s1, pre-impregnation: pre-impregnating the base cloth by adopting pre-impregnated working slurry with biodegradability, wherein the pre-impregnated working slurry is 80 parts of bio-based degradable polyurethane resin, 300 parts of DMF (dimethyl formamide) and 5 parts of ultrafine graphene;
the preparation method of the pre-impregnated working slurry comprises the following steps: adding graphene and DMF into a vacuum stirring kettle, stirring for 20-30 minutes at 25-30 ℃ at 500-800r/min, adding the bio-based degradable polyurethane resin, stirring for 30-40 minutes at 1000-1500r/min, then carrying out vacuum defoaming for 60-120 minutes, and finally filtering by using a 100-mesh sieve to obtain the pre-impregnated working slurry.
S2, coating: coating the pre-impregnated base cloth by using biodegradable coating working slurry, wherein the coating working slurry comprises 60 parts of biodegradable polyurethane resin, 30 parts of common polyurethane resin, 100 parts of MF (multi-function) resin, 5 parts of carboxymethyl cellulose, 5 parts of ultrafine graphene, 5 parts of ramie fiber and 2 parts of calcium gluconate;
the preparation steps of the coating working slurry are as follows: adding graphene, ramie fiber powder, carboxymethyl cellulose, calcium gluconate and DMF (dimethyl formamide) into a vacuum stirring kettle, stirring for 30 minutes at 500-800r/m, adding the bio-based degradable resin, stirring for 60-120 minutes at 1000-1500r/m, defoaming for 60-120m in vacuum, and filtering by using a 180-200-mesh sieve to prepare coating working slurry for later use.
S3, solidification: solidifying the polyurethane in the pre-impregnated coating slurry and the coating working slurry on the surface of the base cloth;
s4, cleaning: washing the base cloth with clean water, and cleaning DMF left in the base cloth;
and S5, carrying out drum-type conveying and preheating on the base cloth cleaned in the step S4, pre-flattening while preheating, ironing, drying and shaping to obtain the bio-based degradable impregnated scratch-coated woven fabric polyurethane synthetic leather base blank.
The bio-based degradable impregnation coating scraping machine weaving polyurethane synthetic leather base blank prepared by the steps reduces the chemical fiber content, is beneficial to reducing the environmental pollution, and is low-carbon and environment-friendly.
After being defoamed by a vacuum defoaming machine, the composite material is dipped or coated on base cloth, and then is put into water which has affinity with DMF but has no affinity with polyurethane resin, the DMF is replaced by the water, and the polyurethane resin is gradually solidified, so that a porous high polymer film is formed.
Therefore, in the present application, the purpose of step S4 is to immerse the base cloth in the leaching solution in order to remove a small amount of residual DMF in the base cloth, so that the residual DMF is dissolved in the leaching solution by using the good mutual solubility of the residual DMF and the leaching solution, thereby removing the residual DMF from the base cloth. Wherein the leaching solution is clear water as used in step S4.
In addition, in a possible embodiment, in the step S4, the clean water is heated to 35-45 ℃, and the base cloth is kept to be leached in the heated clean water for 50-60 minutes. The purpose of this is to sufficiently leach out DMF remaining in the base cloth in order to improve the leaching effect.
Furthermore, also for improving the leaching effect, in another possible embodiment, the washing process of step S4 may be performed in an ultrasonic environment, and compared to the heating embodiment, the washing process is performed in ultrasonic, which can reduce the consumption of clean water, reduce the extraction time, and improve the extraction efficiency more quickly, specifically, the mechanical vibration wave is generated quickly by the ultrasonic transducer, and the cavitation effect, the mechanical effect, the thermal effect, and the higher acceleration, the emulsification, the stirring effect, and the like, which are generated by the ultrasonic radiation pressure, are utilized to increase the movement speed of the medium molecules, increase the penetrating power of the medium, and reduce the interaction force between the target extract (i.e. DMF) and the sample substrate (i.e. base cloth), thereby accelerating the DMF to enter the clean water, and promoting the extraction process.
In the present application, the biodegradable polyurethane resin is a bio-based modified polyurethane resin, and is composed of an aqueous bio-based modified high-solid polyol and a bio-based modified isocyanate, and the ratio of the aqueous bio-based modified high-solid polyol to the bio-based modified isocyanate is 2:3.
fully mixing the waterborne bio-based modified high-solid content polyol and the bio-based modified isocyanate according to a proportion, and baking for 10min at the temperature of 115 ℃ to prepare the bio-based modified polyurethane resin.
In order to improve the working efficiency of the base cloth in the step S5 and improve the quality of the prepared synthetic leather bottom blank, in the step S5, a roller type preheating structure is adopted in the preheating process.
Specifically, the roller type preheating structure comprises a conveying belt and two extruding rollers which are positioned at the upstream end and the downstream end of the conveying belt and are matched with each other in a pairwise manner, a plurality of heating plates are arranged on the upper side and the lower side of the conveying belt, when preheating is carried out, the base cloth is flatly attached to the upstream end of the conveying belt and is conveyed forwards by the conveying belt, and the base cloth is extruded and preheated through the upper roller and the lower roller. When preheating, the base cloth is flatly attached to the upper surface of the conveying belt and is conveyed forwards by the conveying belt, and in the conveying process, the base cloth is preheated under the action of the heating plate, so that the base cloth is preheated while being conveyed, and when the base cloth is conveyed to a space between two rollers which are arranged up and down, the base cloth is extruded by the two rollers, so that the preheating efficiency of the base cloth can be improved under the action of extrusion, and the base cloth can be pre-flattened.
In addition, in order to improve the flatness of the base cloth in the pre-stretching and flattening process, the roller type preheating structure further comprises a flattening fan, the fan is located beside the roller at the upstream end, the base cloth is extruded and preheated by the upper roller and the lower roller, the flattening wind is conveyed to the surface of the base cloth by the fan towards the mutual extrusion ends of the two rollers, and the base cloth is flattened while being preheated under the action of wind power. Preferably, the flattening fan is obliquely arranged, so that the wind direction blown to the base cloth by the air outlet of the flattening fan is oblique, and thus, the flattening wind can apply wind forces in the horizontal direction and the vertical direction to the base cloth, and the flattening degree of the base cloth is improved. Furthermore, in order to avoid the bad influence of the flattening air on the preheating effect, an air heater can be arranged in the air outlet direction of the flattening air, so that the flattening air blown out by the flattening air heater is hot air, the normal preheating of the base cloth cannot be influenced, and the preheating effect can be improved. And the flattening air can be set to be a cold-hot air alternative mode to alternately distribute air to the base cloth, the hot air is preheated and flattened, the cold air is shaped, and the preheated base cloth output by the conveying belt can be shaped so as to facilitate the subsequent ironing process.
Example 2
A bio-based degradable impregnation coating scraping machine woven cloth polyurethane synthetic leather bottom blank, wherein a cotton-polyester blended machine woven cloth is selected as a base cloth of the bottom blank;
the preparation method of the bottom blank comprises the following steps:
s1, pre-impregnation: pre-impregnating the base cloth by using pre-impregnated working slurry with biodegradability, wherein the pre-impregnated working slurry is 890 parts of bio-based degradable polyurethane resin, 350 parts of DMF (dimethyl formamide) and 6 parts of ultrafine graphene;
the preparation method of the pre-impregnated working slurry comprises the following steps: adding graphene and DMF into a vacuum stirring kettle, stirring for 20-30 minutes at 25-30 ℃ at 500-800r/min, adding the bio-based degradable polyurethane resin, stirring for 30-40 minutes at 1000-1500r/min, then carrying out vacuum defoaming for 60-120 minutes, and finally filtering by using a 100-mesh sieve to obtain the pre-impregnated working slurry.
S2, coating: coating the pre-impregnated base cloth with biodegradable coating working slurry, wherein the coating working slurry comprises 65 parts of biodegradable polyurethane resin, 35 parts of common polyurethane resin, 100 parts of MF (multi-function) resin, 6 parts of carboxymethyl cellulose, 6 parts of ultrafine graphene, 6 parts of ramie fiber and 3 parts of calcium gluconate;
the preparation method of the coating working slurry comprises the following steps: firstly adding graphene, ramie fiber powder, carboxymethyl cellulose, calcium gluconate and DMF (dimethyl formamide) into a vacuum stirring kettle, stirring for 30 minutes at a speed of 500-800r/m, then adding the bio-based degradable resin, stirring for 60-120 minutes at a speed of 1000-1500r/m, then defoaming for 60-120m in vacuum, and finally filtering by using a 180-200-mesh sieve to prepare the coating working slurry for later use.
S3, solidification: solidifying the polyurethane in the pre-impregnated coating slurry and the coating working slurry on the surface of the base cloth;
s4, cleaning: washing the base cloth with clean water, and cleaning DMF left in the base cloth;
and S5, carrying out drum-type conveying and preheating on the base cloth cleaned in the step S3, pre-flattening while preheating, ironing, drying and shaping to obtain the bio-based degradable impregnated scratch-coated woven fabric polyurethane synthetic leather base blank.
Example 3
A bio-based degradable impregnated scraping machine-woven fabric polyurethane synthetic leather bottom blank is characterized in that a cotton-polyester blended machine-woven fabric is selected as a base fabric of the bottom blank;
the preparation method of the bottom blank comprises the following steps:
s1, pre-impregnation: pre-impregnating the base cloth by using pre-impregnated working slurry with biodegradability, wherein the pre-impregnated working slurry is 95 parts of bio-based degradable polyurethane resin, 380 parts of DMF (dimethyl formamide) and 8 parts of ultrafine graphene;
the preparation method of the pre-impregnated working slurry comprises the following steps: adding graphene and DMF into a vacuum stirring kettle, stirring at 25-30 ℃ at 500-800r/min for 20-30 minutes, adding the biodegradable polyurethane resin, stirring at 1000-1500r/min for 30-40 minutes, then performing vacuum defoaming for 60-120 minutes, and finally filtering with a 100-mesh sieve to obtain the pre-impregnated working slurry.
S2, coating: coating the pre-impregnated base cloth by using biodegradable coating working slurry, wherein the coating working slurry comprises 68 parts of biodegradable polyurethane resin, 38 parts of common polyurethane resin, 100 parts of MF (multi-function) resin, 8 parts of carboxymethyl cellulose, 8 parts of ultrafine graphene, 8 parts of ramie fiber and 4 parts of calcium gluconate;
the preparation method of the coating working slurry comprises the following steps: firstly adding graphene, ramie fiber powder, carboxymethyl cellulose, calcium gluconate and DMF (dimethyl formamide) into a vacuum stirring kettle, stirring for 30 minutes at a speed of 500-800r/m, then adding the bio-based degradable resin, stirring for 60-120 minutes at a speed of 1000-1500r/m, then defoaming for 60-120m in vacuum, and finally filtering by using a 180-200-mesh sieve to prepare the coating working slurry for later use.
S3, solidification: solidifying the polyurethane in the pre-impregnated coating slurry and the coating working slurry on the surface of the base cloth;
s4, cleaning: washing the base cloth with clean water, and cleaning DMF left in the base cloth;
and S5, conveying and preheating the base cloth cleaned in the step S3 in a drum type, pre-flattening while preheating, ironing, drying and shaping to obtain the woven polyurethane synthetic leather base blank of the bio-based degradable impregnation coating and scraping machine.
Example 4
A bio-based degradable impregnation coating scraping machine woven cloth polyurethane synthetic leather bottom blank, wherein a cotton-polyester blended machine woven cloth is selected as a base cloth of the bottom blank;
the preparation method of the bottom blank comprises the following steps:
s1, pre-impregnation: pre-impregnating the base cloth by using pre-impregnated working slurry with biodegradability, wherein the pre-impregnated working slurry is 100 parts of biodegradable polyurethane resin, 400 parts of DMF (dimethyl formamide) and 10 parts of ultrafine graphene;
the preparation method of the pre-impregnated working slurry comprises the following steps: adding graphene and DMF into a vacuum stirring kettle, stirring for 20-30 minutes at 25-30 ℃ at 500-800r/min, adding the bio-based degradable polyurethane resin, stirring for 30-40 minutes at 1000-1500r/min, then carrying out vacuum defoaming for 60-120 minutes, and finally filtering by using a 100-mesh sieve to obtain the pre-impregnated working slurry.
S2, coating: coating the pre-impregnated base cloth with biodegradable coating working slurry, wherein the coating working slurry comprises 70 parts of biodegradable polyurethane resin, 40 parts of common polyurethane resin, 100 parts of MF (multi-function) resin, 10 parts of carboxymethyl cellulose, 10 parts of ultrafine graphene, 10 parts of ramie fiber and 5 parts of calcium gluconate;
the preparation steps of the coating working slurry are as follows: adding graphene, ramie fiber powder, carboxymethyl cellulose, calcium gluconate and DMF (dimethyl formamide) into a vacuum stirring kettle, stirring for 30 minutes at 500-800r/m, adding the bio-based degradable resin, stirring for 60-120 minutes at 1000-1500r/m, defoaming for 60-120m in vacuum, and filtering by using a 180-200-mesh sieve to prepare coating working slurry for later use.
S3, solidification: solidifying the polyurethane in the pre-impregnated coating slurry and the coating working slurry on the surface of the base cloth;
s4, cleaning: washing the base cloth with clean water, and cleaning DMF left in the base cloth;
and S5, conveying and preheating the base cloth cleaned in the step S3 in a drum type, pre-flattening while preheating, ironing, drying and shaping to obtain the woven polyurethane synthetic leather base blank of the bio-based degradable impregnation coating and scraping machine.
The synthetic leather base blanks prepared in examples 1 to 4 were tested for organic matter content, heavy metal content, DMF content and aging resistance by the following test methods, respectively.
The test method comprises the following steps:
the carbon 12 isotope method is adopted to determine the content of organic substances in the synthetic leather bottom blanks prepared in the examples 1 to 4;
measuring the content of heavy metals in the synthetic leather bottom blank prepared in the embodiment 1-4 by adopting a fluorescence spectrometer;
measuring the DMF content of the synthetic leather base blanks prepared in the examples 1-4 by adopting an image-liquid mass spectrometer;
the jungle test method was used to determine the 14-day aging resistance of the synthetic leather basestocks prepared in examples 1-4.
The test results are shown in table 1:
TABLE 1
| Organic matter content | Heavy metal content | DMF content | Age resistance of 14 days | |
| Example 1 | About 35 percent | About 98PPM | About 97PPM | Is not broken |
| Example 2 | About 37 percent | About 97PPM | About 95PPM | Is not broken |
| Example 3 | About 36 percent | About 96PPM | About 97PPM | Is not broken |
| Example 4 | About 35 percent | About 98PPM | About 98PPM | Is not broken |
As can be seen from the data in Table 1, that is, the test results of examples 1-4, the impregnated, coated and scraped woven fabric polyurethane synthetic leather base stock prepared by the invention adopts degradable bio-based raw materials as the base material, the organic content is more than 35%, the heavy metal content is less than 100PPM, the DMF content is less than 100PPM, and the base stock is aging resistant and has no damage after 14 days. Among them, the performance of example 2 is particularly outstanding, with the highest organic content and the lowest heavy metal content and DMF content.
Meanwhile, the biodegradation rates of the synthetic leather base blanks prepared in the embodiments 1 to 4 are also determined, and the test results are shown in table 2:
TABLE 2
| Rate of biodegradation | |
| Example 1 | About 96 percent |
| Example 2 | About 98 percent |
| Example 3 | About 97% |
| Example 4 | About 96 percent |
From the data in table 2, that is, the test results of examples 1 to 4, it can be seen that the biodegradation rates of the polyurethane synthetic leather base blanks prepared by the impregnation, coating and scraping machine fabric of the invention are all over 95%, and the green, environment-friendly and degradable functions are realized.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to those skilled in the art may occur to persons skilled in the art without departing from the spirit and scope of the present invention.
Claims (10)
1. A bio-based degradable impregnation coating scraping machine woven cloth polyurethane synthetic leather bottom blank is characterized in that a cotton-polyester blended woven cloth is selected as a base cloth of the bottom blank;
the preparation steps of the bottom blank are as follows:
s1, pre-impregnation: pre-impregnating the base cloth by adopting pre-impregnated working slurry with biodegradability;
s2, coating: coating the pre-impregnated base cloth by using coating working slurry with biodegradability;
s3, solidification: solidifying the polyurethane in the pre-impregnated coating slurry and the coating working slurry on the surface of the base cloth;
s4, cleaning: washing the base cloth with clean water, and cleaning DMF left in the base cloth;
and S5, carrying out drum-type conveying and preheating on the base cloth cleaned in the step S4, pre-flattening while preheating, ironing, drying and shaping to obtain the bio-based degradable impregnated scratch-coated woven fabric polyurethane synthetic leather base blank.
2. The bio-based degradable impregnation coating and scraping machine weaving polyurethane synthetic leather base blank according to claim 1, wherein the pre-impregnation working slurry in the step S1 is 80-100 parts of bio-based degradable polyurethane resin, 300-400 parts of DMF, and 5-10 parts of ultra-fine graphene.
3. The bio-based degradable impregnation coating and scraping woven fabric polyurethane synthetic leather base blank according to claim 2, wherein the preparation step of the pre-impregnation working slurry in the step S1 is as follows: adding graphene and DMF into a vacuum stirring kettle, stirring for 20-30 minutes at 25-30 ℃ at 500-800r/min, adding bio-based degradable polyurethane resin, stirring for 30-40 minutes at 1000-1500r/min, then carrying out vacuum defoaming for 60-120 minutes, and finally filtering by using a 100-mesh sieve to obtain the pre-impregnated working slurry.
4. The bio-based degradable impregnation coating and scraping machine weaving polyurethane synthetic leather base blank according to claim 1 or 3, wherein the coating working slurry in the step S2 is 60-70 parts of bio-based degradable polyurethane resin, 30-40 parts of common polyurethane resin, 100 parts of MF, 5-10 parts of carboxymethyl cellulose, 5-10 parts of ultrafine graphene, 5-10 parts of ramie fiber and 2-5 parts of calcium gluconate.
5. The bio-based degradable impregnation coating and scraping woven fabric polyurethane synthetic leather base blank according to claim 4, wherein the preparation step of the coating working slurry in the step S2 is as follows: adding graphene, ramie fiber powder, carboxymethyl cellulose, calcium gluconate and DMF (dimethyl formamide) into a vacuum stirring kettle, stirring for 30 minutes at 500-800r/m, adding the bio-based degradable resin, stirring for 60-120 minutes at 1000-1500r/m, defoaming for 60-120m in vacuum, and filtering by using a 180-200-mesh sieve to prepare coating working slurry for later use.
6. The bio-based degradable impregnation coating and scraping machine woven cloth polyurethane synthetic leather base blank according to claim 1, wherein in the preheating process, a roller type preheating structure is adopted;
the roller type preheating structure comprises a conveying belt and two extruding rollers which are located at the upstream end and the downstream end of the conveying belt and matched with each other in a pairwise mode, a plurality of heating plates are arranged on the upper side and the lower side of the conveying belt, when the preheating structure is used for preheating, base cloth is flatly attached to the upstream end of the conveying belt and conveyed forwards through the conveying belt, and the base cloth is extruded and preheated through the upper roller and the lower roller.
7. The bio-based degradable impregnation coating and scraping machine woven fabric polyurethane synthetic leather base blank according to claim 6, wherein the flattening fan is obliquely arranged.
8. The bio-based degradable impregnation coating and scraping woven fabric polyurethane synthetic leather base blank according to claim 7, wherein in the cleaning process of step S4, the base fabric is cleaned in a temperature-rising environment or in an ultrasonic field.
9. The bio-based degradable impregnation coating and scraping machine weaving cloth polyurethane synthetic leather base blank according to claim 1 or 8, wherein the bio-based degradable polyurethane resin is a bio-based modified polyurethane resin, and is composed of aqueous bio-based modified high-solid content polyol and bio-based modified isocyanate, and the proportion of the aqueous bio-based modified high-solid content polyol to the bio-based modified isocyanate is 2:3.
10. the bio-based degradable impregnation coating and scraping machine weaving polyurethane synthetic leather base blank according to claim 9, wherein the bio-based modified polyurethane resin is prepared by fully mixing the waterborne bio-based modified high solid content polyol and the bio-based modified isocyanate according to a proportion and then baking the mixture for 10min at a temperature of 115 ℃.
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