CN111395029A - High-temperature-resistant embossing release paper for PU leather production and preparation process thereof - Google Patents
High-temperature-resistant embossing release paper for PU leather production and preparation process thereof Download PDFInfo
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- CN111395029A CN111395029A CN202010210411.9A CN202010210411A CN111395029A CN 111395029 A CN111395029 A CN 111395029A CN 202010210411 A CN202010210411 A CN 202010210411A CN 111395029 A CN111395029 A CN 111395029A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
- D21H27/40—Multi-ply at least one of the sheets being non-planar, e.g. crêped
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
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Abstract
A high temperature resistant embossing release paper for PU leather production and a preparation process thereof, wherein the high temperature resistant embossing release paper comprises a back coating layer, a base paper, a laminating layer and an embossing layer which are sequentially arranged from inside to outside; the base paper comprises the following components in parts by weight: 70-80 parts of sulfate bleached softwood, 10-20 parts of hardwood pulp board, 8-10 parts of inorganic high-temperature resistant auxiliary agent, 3-5 parts of organic high-temperature resistant auxiliary agent, 1-1.5 parts of high-temperature resistant reinforcing agent, 0.6-0.7 part of sizing agent and 0.3-0.5 part of humidifying reinforcing agent. The high-temperature resistant embossing release paper for PU leather production and the preparation process thereof have the advantages of reasonable formula, simple preparation process and low production cost, and also solve the problems of easy volatilization of toxic solvents, serious environmental pollution and the like in the preparation process.
Description
Technical Field
The invention belongs to the technical field of release paper, and particularly relates to high-temperature-resistant embossed release paper for PU leather production and a preparation process thereof.
Background
The release paper for leather production belongs to one kind of coating anti-sticking paper, and is carrier and temporary mold for producing polyurethane leather and polyvinyl chloride artificial leather. The early leather-making process is that the stainless steel belt is coated with pasty resin, dried and formed, and then embossed with certain pattern by embossing machine. Later, the stainless steel strip is produced by a release paper method, namely the release paper is used for replacing the stainless steel strip. The surface of the release paper is firstly rolled into a certain pattern, the surface layer of the release paper has a release layer with good performance, the surface of the release layer is directly coated with pasty resin for a plurality of times, and the release paper is processed by a foaming process, dried, cured, crosslinked and shaped, and then peeled to prepare the artificial leather with smooth surface or concave-convex pattern surface or the foam plastic product with luster. Compared with the stainless steel belt method, the release paper method has the advantages of more reasonable process for producing leather, simple equipment and economic investment, and is particularly favorable for foaming, so that the prepared synthetic leather has low density and good hand feeling. Can save one third to one half of various chemical raw materials, can be made into leather with lower density, and can improve the product quality. In addition, the most suitable application of the fabric sensitive to certain fabrics and tension can prepare a soft and good-hand-feeling plastic film layer.
The performance requirements of the PU leather release paper are as follows: (1) the strength release paper has certain strength, and the performance has great influence on the operation smoothness of the production process and the use times of the paper. In particular, the tear strength, when the release paper is torn in the width direction during transfer, must be able to withstand a certain tear load; (2) surface uniformity: the thickness of the coating comprises uniform release capacity, uniform gloss or uniform pattern consistency; (3) solvent resistance solvents commonly used in the leather production process include dimethyl phthalide amine, methyl ethyl ketone, toluene, xylene, ethyl acetate and the like, release paper must not be affected by the solvent, and the release paper must not be dissolved and not swell; (3) a suitable peel strength; (4) temperature resistance: the curing temperature during the production of PU leather is 140-150 ℃; (5) the repeated use times are not less than 25.
With the development and progress of the technology, in order to reduce the production cost and environmental protection, a high-temperature resistant embossed release paper for producing PU leather and a preparation process thereof need to be developed.
Chinese patent application No. CN201620931726.1 discloses an easily-torn release paper, which improves the peeling performance of the release paper and does not improve the high temperature resistance.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects, the invention aims to provide the high-temperature resistant embossing release paper for producing the PU leather and the preparation process thereof, the formula is reasonable, the preparation process is simple, the production cost is low, the problems that toxic solvents are easy to volatilize in the preparation process, the environmental pollution is serious and the like are solved, the prepared high-temperature resistant embossing release paper has good release performance, high tensile strength, no curling, no powder falling or damage on the surface and good high-temperature resistance, has attractive application prospect in PU leather production, and has wide application prospect.
The purpose of the invention is realized by the following technical scheme:
the high-temperature-resistant embossing release paper for PU leather production comprises a back coating layer, a base paper, a laminating layer and an embossing layer which are sequentially arranged from inside to outside;
the base paper comprises the following components in parts by weight:
70-80 parts of sulfate bleached softwood, 10-20 parts of hardwood pulp board, 8-10 parts of inorganic high-temperature resistant auxiliary agent, 3-5 parts of organic high-temperature resistant auxiliary agent, 1-1.5 parts of high-temperature resistant reinforcing agent, 0.6-0.7 part of sizing agent and 0.3-0.5 part of humidifying reinforcing agent;
the laminating layer comprises the following components in parts by weight: 50-55 parts of aliphatic polyurethane difunctional acrylate, 10-12 parts of 2 (2-ethoxyethoxy) ethyl acrylate, 6-10 parts of acrylate modified organic silica gel, 6-8 parts of trimethylolpropane triacrylate and 4-5 parts of tripropylene glycol diacrylate.
The high-temperature resistant embossed release paper comprises a back coating layer, a base paper, a laminating layer and an embossing layer which are sequentially arranged from inside to outside, and is used for producing PU leather with a patterned surface. The base paper is used as a base material, sulfate bleached softwood and hardwood pulp boards are used as main materials, and inorganic high-temperature resistant auxiliary agents, organic high-temperature resistant auxiliary agents, high-temperature resistant reinforcing agents, sizing agents and humidifying reinforcing agents are used as functional auxiliary materials. Because the softwood pulp fiber is thicker and longer, and the hardwood pulp fiber is shorter and thinner, the softwood pulp fiber and the hardwood pulp fiber are combined together, and under the proportion, the tensile strength of the base paper can be improved, and the loss rate is minimum, namely, the base paper has better high-temperature resistance; the inorganic high-temperature-resistant auxiliary agent, the organic high-temperature-resistant auxiliary agent and the high-temperature-resistant reinforcing agent can greatly improve the high-temperature resistance of the base paper; the sizing agent forms a layer of good waterproof film on the surface of the base paper fiber, so that the tensile strength of the base paper is improved; in the preparation process, release paper is coated for many times, so that the physical strength of paper sheets such as tensile strength, folding resistance and the like of the release paper is inevitably influenced, and the physical property of the paper base paper is improved by adopting a process mode of adding a wet strength agent into the base paper pulp.
Further, in the high-temperature resistant embossed release paper for producing the PU leather, the inorganic high-temperature resistant auxiliary agent is SR 004; the organic high-temperature resistant auxiliary agent is a mixture of SR6 and SR 9; the moisturizing enhancer is TH-P50; the sizing agent is AKD.
The inorganic high-temperature resistant auxiliary SR004 is an aluminide, and has the advantages of good heat resistance, good heat-resistant durability, excellent corrosion resistance, better solubility for organic high-temperature resistant auxiliary, increased thermal stability and the like; the organic high-temperature resistant auxiliary agent is a mixture of SR6 and SR9, and SR6 is acrylic acid modified resin, so that the organic high-temperature resistant auxiliary agent has the advantages of strong adhesive force, good hydrophobic property, good heat resistance, good heat-resistant durability and the like; SR9 is epoxy modified organic silicon resin, has advantages such as adhesive force is strong, high temperature resistance is good, corrosion resisting property is excellent, and the effect is better for the cooperation of the two.
The invention also relates to a preparation process of the high-temperature resistant embossing release paper for producing the PU leather, which sequentially comprises the steps of preparing base paper, preparing a laminating layer, preparing an embossing layer and preparing a back coating; the preparation of the base paper comprises the following steps:
(1) preparing base paper sizing agent: according to the mass parts of the components of the base paper, soaking a sulfate bleached softwood pulp board and a hardwood pulp board in water for 3-5 hours, pulping by using a pulping machine, concentrating the concentration of the pulp by 10-12%, and pulping in a pulping machine to obtain paper pulp; concentrating the paper pulp, and uniformly dispersing the concentrated paper pulp into a sealed bag to balance moisture for 24 hours at normal temperature;
(2) sheet making: adding a wetting enhancer and an inorganic high-temperature-resistant auxiliary agent into the slurry in sequence, and then fully separating in a fiber separator at the rotation speed of 30000 r/min at the rotation speed of 2900 r/min; making the dispersed slurry into sheets in a sheet making machine;
(3) squeezing and drying: pressing the wet paper sheet obtained by sheet making in an oil press, wherein the pressure is 3.5-4.5MPa, and the pressing time is 30 s; drying the paper sheet obtained after squeezing in a vacuum dryer at the drying temperature of 100 ℃ and 110 ℃ for 2-3min to finally obtain dried base paper;
(4) sizing: sizing the surface of the base paper by using a sizing agent;
(5) pretreatment: drying the sized base paper in a vacuum dryer at the drying temperature of 120 ℃ for 1min, and coating the high-temperature-resistant reinforcing agent and the organic high-temperature-resistant auxiliary agent on the surface of the base paper in a multi-layer coating mode.
The tensile strength value of the high-temperature resistant release base paper obtained by adding the inorganic high-temperature resistant additive into the pulp is higher than that obtained by surface coating, because when the surface coating is adopted, the inorganic high-temperature resistant additive is remained on the surface of the paper sheet to have certain heat absorption and heat preservation effects; because the inorganic high-temperature resistant auxiliary agent is remained on the surface of the paper sheet, a good film cannot be formed on the surface of the fiber during sizing, so that the organic high-temperature resistant auxiliary agent is immersed in the fiber and cannot play a role in heat insulation and temperature resistance. In order to form a good high-temperature-resistant organic film on the surface of the fiber and prevent the organic high-temperature-resistant auxiliary agent from immersing into the fiber, a sizing agent is coated first, and then the high-temperature-resistant reinforcing agent and the organic high-temperature-resistant auxiliary agent are coated, so that the tensile strength of the base paper is improved, and the high-temperature-resistant performance is improved.
Further, according to the preparation process of the high-temperature-resistant embossed release paper for producing the PU leather, the pulping time in the step (1) is 5min, so that the pulping degree of the paper pulp is 30-35 DEG SR.
Further, the preparation process of the high-temperature embossing-resistant release paper for producing the PU leather comprises the following steps:
(1) preparing a coating of a laminating layer: weighing aliphatic polyurethane difunctional acrylate, 2 (2-ethoxyethoxy) ethyl acrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate and acrylate-modified organic silica gel according to the mass parts of the components of the curtaining layer, mixing, sealing, putting into a 70 ℃ oven, stirring uniformly, standing to remove bubbles after uniform mixing, and obtaining an acrylate resin mixed solution; adding a photoinitiator into the mixed solution of the acrylate resin, stirring and mixing, placing in a 30 ℃ oven for 4 hours after uniform mixing, and removing bubbles in the mixed solution to obtain the coating of the PE coating;
(2) coating: drying the pretreated base paper in a vacuum drier at 120 ℃ for 1 min; and (3) coating the coating of the laminating layer on the surface of the dried base paper, and then placing the base paper on a pre-opened conveyor belt type UV curing machine for ultraviolet curing to prepare the laminating layer.
The most core part of the release paper type paper is the coating on the paper, and the performance of the coating is directly related to the performance of the release paper. The traditional preparation of the laminating layer generally adopts a heat curing mode, and a large amount of toxic solvent is volatilized during curing, so that the environmental pollution is serious; the volatilization of the solvent has certain influence on the performance of the coating; the energy waste is serious, and the curing efficiency is low; the curing device occupies a large space, which brings inconvenience to production. In addition, the cost of production and maintenance is also high.
The invention adopts the ultraviolet light curing mode to prepare the coating. The coating prepared by the method has extremely short curing time, good adhesive force with a base material, 100 percent of solid content of the prepared coating, no release of solvent, environmental protection requirement and excellent comprehensive performance.
Further, in the preparation process of the high-temperature embossing-resistant release paper for producing the PU leather, the photoinitiator is a mixture of the photoinitiator 1173 and the photoinitiator 184, and the ratio of the photoinitiator 1173 to the photoinitiator 184 is 1: 1.
Further, the preparation process of the high-temperature-resistant embossed release paper for producing the PU leather comprises the following steps of: embossing by using an embossing machine, wherein the speed of the embossing machine is 15m/min, the temperature of the paper surface before entering a pressing area is 160-250 ℃, the temperature of an embossing roller is 30-80 ℃, and a quartz infrared heater of the embossing machine is 15cm away from the paper surface and 5-6cm away from a pressing area.
Further, the preparation process of the high-temperature embossing-resistant release paper for producing the PU leather comprises the following steps: carrying out back coating by adopting an air knife coater to obtain the back coating; then, the surface of the electric furnace is pre-dried once at the temperature of 250 ℃ and then is quickly dried in a vacuum drier, wherein the drying temperature is 120 ℃ and the drying time is 1 min.
After the high-temperature-resistant embossing release paper for PU leather production is embossed, proper back coating treatment is carried out on the leather release paper in order to reduce the curling smoothness of the paper in the using process and eliminate the static electricity of the leather release paper.
Further, the preparation process of the high temperature resistant embossing release paper for PU leather production comprises the steps of using acrylamide polymer as the back coating, wherein the speed of an air knife coater is 200m/min, and the air pressure of the air knife is 0.4-0.6Mpa/cm 2.
Compared with the prior art, the invention has the following beneficial effects:
(1) the high-temperature-resistant embossed release paper for producing the PU leather disclosed by the invention has the advantages of good release performance, high tensile strength, no curling, no powder falling on the surface, no damage, good high-temperature resistance, attractive application prospect in PU leather production and wide application prospect;
(2) the preparation process of the high-temperature resistant embossing release paper for producing the PU leather is simple, has high flexibility and low cost, and also solves the problems of easy volatilization of toxic solvents, serious environmental pollution and the like in the preparation process.
Drawings
FIG. 1 is a schematic structural diagram of a high temperature resistant embossed release paper for PU leather production according to the present invention;
in the figure: the back coating comprises a back coating layer (1), base paper (2), a film coating layer (3) and an embossing layer (4).
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments and specific experimental data, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following embodiment provides high-temperature-resistant embossing release paper for PU leather production and a preparation process thereof, wherein the high-temperature-resistant embossing release paper comprises a back coating layer 1, base paper 2, a laminating layer 3 and an embossing layer 4 which are sequentially arranged from inside to outside;
the base paper comprises the following components in parts by weight:
70-80 parts of sulfate bleached softwood, 10-20 parts of hardwood pulp board, 8-10 parts of inorganic high-temperature resistant auxiliary agent, 3-5 parts of organic high-temperature resistant auxiliary agent, 1-1.5 parts of high-temperature resistant reinforcing agent, 0.6-0.7 part of sizing agent and 0.3-0.5 part of humidifying reinforcing agent;
the laminating layer comprises the following components in parts by weight: 50-55 parts of aliphatic polyurethane difunctional acrylate, 10-12 parts of 2 (2-ethoxyethoxy) ethyl acrylate, 6-10 parts of acrylate modified organic silica gel, 6-8 parts of trimethylolpropane triacrylate and 4-5 parts of tripropylene glycol diacrylate.
Example 1
The base paper comprises the following components in parts by weight: 75 parts of sulfate bleached softwood, 15 parts of hardwood pulp board, 8 parts of inorganic high-temperature resistant auxiliary agent, 5 parts of organic high-temperature resistant auxiliary agent, 1 part of high-temperature resistant reinforcing agent, 0.6 part of sizing agent and 0.5 part of humidifying agent;
the laminating layer comprises the following components in parts by weight: 55 parts of aliphatic polyurethane difunctional acrylate, 10 parts of 2 (2-ethoxyethoxy) ethyl acrylate, 6 parts of acrylate modified organic silica gel, 6 parts of trimethylolpropane triacrylate and 4 parts of tripropylene glycol diacrylate.
The preparation process of the high-temperature-resistant embossed release paper for PU leather production sequentially comprises the steps of raw paper preparation, laminating layer preparation, embossing layer preparation and back coating preparation.
The preparation of the base paper comprises the following steps:
(1) preparing base paper sizing agent: according to the mass parts of the components of the base paper, soaking a sulfate bleached softwood pulp board and a hardwood pulp board in water for 3-5 hours, pulping by using a pulping machine, concentrating the concentration of the pulp by 10-12%, and pulping in a pulping machine for 5min to ensure that the pulping degree of the pulp is in 30-35 DEG SR to obtain the pulp; concentrating the paper pulp, and uniformly dispersing the concentrated paper pulp into a sealed bag to balance moisture for 24 hours at normal temperature;
(2) sheet making: adding a wetting enhancer and an inorganic high-temperature-resistant auxiliary agent into the slurry in sequence, and then fully separating in a fiber separator at the rotation speed of 30000 r/min at the rotation speed of 2900 r/min; making the dispersed slurry into sheets in a sheet making machine;
(3) squeezing and drying: pressing the wet paper sheet obtained by sheet making in an oil press, wherein the pressure is 3.5-4.5MPa, and the pressing time is 30 s; drying the paper sheet obtained after squeezing in a vacuum dryer at the drying temperature of 100 ℃ and 110 ℃ for 2-3min to finally obtain dried base paper;
(4) sizing: sizing the surface of the base paper by using a sizing agent;
(5) pretreatment: drying the sized base paper in a vacuum dryer at the drying temperature of 120 ℃ for 1min, and coating the high-temperature-resistant reinforcing agent and the organic high-temperature-resistant auxiliary agent on the surface of the base paper in a multi-layer coating mode.
The preparation of the laminating layer comprises the following steps:
(1) preparing a coating of a laminating layer: weighing aliphatic polyurethane difunctional acrylate, 2 (2-ethoxyethoxy) ethyl acrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate and acrylate-modified organic silica gel according to the mass parts of the components of the curtaining layer, mixing, sealing, putting into a 70 ℃ oven, stirring uniformly, standing to remove bubbles after uniform mixing, and obtaining an acrylate resin mixed solution; adding a photoinitiator into the mixed solution of the acrylate resin, stirring and mixing, placing in a 30 ℃ oven for 4 hours after uniform mixing, and removing bubbles in the mixed solution to obtain the coating of the PE coating; the photoinitiator is a mixture of a photoinitiator 1173 and a photoinitiator 184, and the ratio of the photoinitiator 1173 to the photoinitiator 184 is 1:1
(2) Coating: drying the pretreated base paper in a vacuum drier at 120 ℃ for 1 min; and (3) coating the coating of the laminating layer on the surface of the dried base paper, and then placing the base paper on a pre-opened conveyor belt type UV curing machine for ultraviolet curing to prepare the laminating layer.
The preparation of the embossed layer comprises the following steps:
embossing by using an embossing machine, wherein the speed of the embossing machine is 15m/min, the temperature of the paper surface before entering a pressing area is 160-250 ℃, the temperature of an embossing roller is 30-80 ℃, and a quartz infrared heater of the embossing machine is 15cm away from the paper surface and 5-6cm away from a pressing area.
The preparation of the back coating comprises the following steps: carrying out back coating by adopting an air knife coater to obtain the back coating; then, carrying out primary predrying on the surface of an electric furnace at the temperature of 250 ℃, and then quickly drying in a vacuum drier at the drying temperature of 120 ℃ for 1 min; the back coating uses acrylamide polymer, the speed of the air knife coater is 200m/min, and the air pressure of the air knife is 0.4-0.6Mpa/cm 2.
Example 2
The base paper comprises the following components in parts by weight: 80 parts of sulfate bleached softwood, 10 parts of hardwood pulp board, 8 parts of inorganic high-temperature resistant auxiliary agent, 5 parts of organic high-temperature resistant auxiliary agent, 1.3 parts of high-temperature resistant reinforcing agent, 0.7 part of sizing agent and 0.5 part of humidifying agent;
the laminating layer comprises the following components in parts by weight: 50 parts of aliphatic polyurethane difunctional acrylate, 12 parts of 2 (2-ethoxyethoxy) ethyl acrylate, 10 parts of acrylate modified organic silica gel, 6 parts of trimethylolpropane triacrylate and 4 parts of tripropylene glycol diacrylate.
The preparation process of the high-temperature-resistant embossed release paper for PU leather production sequentially comprises the steps of raw paper preparation, laminating layer preparation, embossing layer preparation and back coating preparation.
The preparation of the base paper comprises the following steps:
(1) preparing base paper sizing agent: according to the mass parts of the components of the base paper, soaking a sulfate bleached softwood pulp board and a hardwood pulp board in water for 3-5 hours, pulping by using a pulping machine, concentrating the concentration of the pulp by 10-12%, and pulping in a pulping machine for 5min to ensure that the pulping degree of the pulp is in 30-35 DEG SR to obtain the pulp; concentrating the paper pulp, and uniformly dispersing the concentrated paper pulp into a sealed bag to balance moisture for 24 hours at normal temperature;
(2) sheet making: adding a wetting enhancer and an inorganic high-temperature-resistant auxiliary agent into the slurry in sequence, and then fully separating in a fiber separator at the rotation speed of 30000 r/min at the rotation speed of 2900 r/min; making the dispersed slurry into sheets in a sheet making machine;
(3) squeezing and drying: pressing the wet paper sheet obtained by sheet making in an oil press, wherein the pressure is 3.5-4.5MPa, and the pressing time is 30 s; drying the paper sheet obtained after squeezing in a vacuum dryer at the drying temperature of 100 ℃ and 110 ℃ for 2-3min to finally obtain dried base paper;
(4) sizing: sizing the surface of the base paper by using a sizing agent;
(5) pretreatment: drying the sized base paper in a vacuum dryer at the drying temperature of 120 ℃ for 1min, and coating the high-temperature-resistant reinforcing agent and the organic high-temperature-resistant auxiliary agent on the surface of the base paper in a multi-layer coating mode.
The preparation of the laminating layer comprises the following steps:
(3) preparing a coating of a laminating layer: weighing aliphatic polyurethane difunctional acrylate, 2 (2-ethoxyethoxy) ethyl acrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate and acrylate-modified organic silica gel according to the mass parts of the components of the curtaining layer, mixing, sealing, putting into a 70 ℃ oven, stirring uniformly, standing to remove bubbles after uniform mixing, and obtaining an acrylate resin mixed solution; adding a photoinitiator into the mixed solution of the acrylate resin, stirring and mixing, placing in a 30 ℃ oven for 4 hours after uniform mixing, and removing bubbles in the mixed solution to obtain the coating of the PE coating; the photoinitiator is a mixture of a photoinitiator 1173 and a photoinitiator 184, and the ratio of the photoinitiator 1173 to the photoinitiator 184 is 1:1
(4) Coating: drying the pretreated base paper in a vacuum drier at 120 ℃ for 1 min; and (3) coating the coating of the laminating layer on the surface of the dried base paper, and then placing the base paper on a pre-opened conveyor belt type UV curing machine for ultraviolet curing to prepare the laminating layer.
The preparation of the embossed layer comprises the following steps:
embossing by using an embossing machine, wherein the speed of the embossing machine is 15m/min, the temperature of the paper surface before entering a pressing area is 160-250 ℃, the temperature of an embossing roller is 30-80 ℃, and a quartz infrared heater of the embossing machine is 15cm away from the paper surface and 5-6cm away from a pressing area.
The preparation of the back coating comprises the following steps: carrying out back coating by adopting an air knife coater to obtain the back coating; then, carrying out primary predrying on the surface of an electric furnace at the temperature of 250 ℃, and then quickly drying in a vacuum drier at the drying temperature of 120 ℃ for 1 min; the back coating uses acrylamide polymer, the speed of the air knife coater is 200m/min, and the air pressure of the air knife is 0.4-0.6Mpa/cm 2.
Example 3
The base paper comprises the following components in parts by weight: 72 parts of sulfate bleached softwood, 12 parts of hardwood pulp board, 10 parts of inorganic high-temperature resistant auxiliary agent, 5 parts of organic high-temperature resistant auxiliary agent, 1 part of high-temperature resistant reinforcing agent, 0.65 part of sizing agent and 0.35 part of humidifying agent;
the laminating layer comprises the following components in parts by weight: 55 parts of aliphatic polyurethane difunctional acrylate, 10 parts of 2 (2-ethoxyethoxy) ethyl acrylate, 6 parts of acrylate modified organic silica gel, 6 parts of trimethylolpropane triacrylate and 5 parts of tripropylene glycol diacrylate.
The preparation process of the high-temperature-resistant embossed release paper for PU leather production sequentially comprises the steps of raw paper preparation, laminating layer preparation, embossing layer preparation and back coating preparation.
The preparation of the base paper comprises the following steps:
(1) preparing base paper sizing agent: according to the mass parts of the components of the base paper, soaking a sulfate bleached softwood pulp board and a hardwood pulp board in water for 3-5 hours, pulping by using a pulping machine, concentrating the concentration of the pulp by 10-12%, and pulping in a pulping machine for 5min to ensure that the pulping degree of the pulp is in 30-35 DEG SR to obtain the pulp; concentrating the paper pulp, and uniformly dispersing the concentrated paper pulp into a sealed bag to balance moisture for 24 hours at normal temperature;
(2) sheet making: adding a wetting enhancer and an inorganic high-temperature-resistant auxiliary agent into the slurry in sequence, and then fully separating in a fiber separator at the rotation speed of 30000 r/min at the rotation speed of 2900 r/min; making the dispersed slurry into sheets in a sheet making machine;
(3) squeezing and drying: pressing the wet paper sheet obtained by sheet making in an oil press, wherein the pressure is 3.5-4.5MPa, and the pressing time is 30 s; drying the paper sheet obtained after squeezing in a vacuum dryer at the drying temperature of 100 ℃ and 110 ℃ for 2-3min to finally obtain dried base paper;
(4) sizing: sizing the surface of the base paper by using a sizing agent;
(5) pretreatment: drying the sized base paper in a vacuum dryer at the drying temperature of 120 ℃ for 1min, and coating the high-temperature-resistant reinforcing agent and the organic high-temperature-resistant auxiliary agent on the surface of the base paper in a multi-layer coating mode.
The preparation of the laminating layer comprises the following steps:
(5) preparing a coating of a laminating layer: weighing aliphatic polyurethane difunctional acrylate, 2 (2-ethoxyethoxy) ethyl acrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate and acrylate-modified organic silica gel according to the mass parts of the components of the curtaining layer, mixing, sealing, putting into a 70 ℃ oven, stirring uniformly, standing to remove bubbles after uniform mixing, and obtaining an acrylate resin mixed solution; adding a photoinitiator into the mixed solution of the acrylate resin, stirring and mixing, placing in a 30 ℃ oven for 4 hours after uniform mixing, and removing bubbles in the mixed solution to obtain the coating of the PE coating; the photoinitiator is a mixture of a photoinitiator 1173 and a photoinitiator 184, and the ratio of the photoinitiator 1173 to the photoinitiator 184 is 1:1
(6) Coating: drying the pretreated base paper in a vacuum drier at 120 ℃ for 1 min; and (3) coating the coating of the laminating layer on the surface of the dried base paper, and then placing the base paper on a pre-opened conveyor belt type UV curing machine for ultraviolet curing to prepare the laminating layer.
The preparation of the embossed layer comprises the following steps:
embossing by using an embossing machine, wherein the speed of the embossing machine is 15m/min, the temperature of the paper surface before entering a pressing area is 160-250 ℃, the temperature of an embossing roller is 30-80 ℃, and a quartz infrared heater of the embossing machine is 15cm away from the paper surface and 5-6cm away from a pressing area.
The preparation of the back coating comprises the following steps: carrying out back coating by adopting an air knife coater to obtain the back coating; then, carrying out primary predrying on the surface of an electric furnace at the temperature of 250 ℃, and then quickly drying in a vacuum drier at the drying temperature of 120 ℃ for 1 min; the back coating uses acrylamide polymer, the speed of the air knife coater is 200m/min, and the air pressure of the air knife is 0.4-0.6Mpa/cm 2.
Effect verification:
the performance of the high temperature embossing-resistant release paper samples 1, 2 and 3 for PU leather production obtained in the above examples 1, 2 and 3 was measured, and the test results are shown in table 1.
(1) Quantification: quantitative determination was carried out according to the national standard (GB/T451.2-1989).
(2) Tensile strength: the tensile strength was determined according to the national standard (GB/T453-1989).
(3) The peeling strength is measured by coating L arithnee A L213 (a single-component aliphatic polyurethane) twice, wherein the coating thickness is 0.15mm each time, drying at 90 ℃ for 90sec each time, drying at 135 ℃ for 60sec, cutting the dried samples 1, 2 and 3 into strips in the longitudinal direction, adhering each sample to a metal support plate by using a double-sided adhesive tape, and using a tensile machine for measuring the tensile strength of paper, changing a lower clamp into the structure shown in the figure A, wherein the peeling speed is constant at 300mm and min, peeling the leather film from the paper, clamping the leather film on an upper clamp, clamping the metal support plate and the sample paper on the lower clamp, and measuring the force of the leather film when peeled.
(4) Temperature resistance: heating a drying oven with air blowing function to 140 ℃, 150 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃, 230 ℃, 240 ℃ and 250 ℃ in sequence, then placing the cut release paper samples 1, 2 and 3 into an enamel tray, and then quickly placing the enamel tray into the drying oven. The pattern was heated in the oven for a minute, immediately removed, cooled in air, visually inspected for a mat change on the paper surface, and compared to the unheated pattern. If the gloss of the paper sample is changed, the paper sample is unqualified, and if the gloss of the paper sample is not changed perceptibly, the paper sample is qualified.
(5) The number of repeated use times is that L arithane A L213 glue is used for secondary coating, the coating thickness is small each time, the coating is dried at the temperature before each coating, then the drying is carried out, the dried leather film is stripped from the paper, the paper surface is cleaned, then the gluing, drying and stripping operations are carried out repeatedly, the stripping strength is measured each time sampling is carried out, the maximum repeated stripping times of the qualified stripping strength are recorded until the stripping strength is unqualified, the number of the maximum repeated stripping times of the qualified stripping strength is recorded, the gloss of the leather film is observed whether visually detectable change exists at the same time, the test is stopped if the gloss visually detectable change exists, and the maximum repeated stripping times of the dull gloss change is recorded.
(6) Solvent resistance: sequentially placing the sample 1, the sample 2 and the sample 3 into Dimethylformamide (DMF) and methyl ethyl ketone solution for soaking for 10min respectively, placing the soaked paper sample at room temperature for natural volatilization, observing whether the surface of the paper sample has the phenomenon of dissolution or swelling after the solvent in the sample 1, the sample 2 and the sample 3 is completely volatilized, and if so, indicating that the performance test result of the sample in the unqualified table 1 is unqualified
The invention has many applications, and the above description is only a preferred embodiment of the invention. It should be noted that the above examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications can be made without departing from the principles of the invention and these modifications are to be considered within the scope of the invention.
Claims (9)
1. The high-temperature-resistant embossing release paper for PU leather production is characterized by comprising a back coating layer (1), base paper (2), a laminating layer (3) and an embossing layer (4) which are sequentially arranged from inside to outside;
the base paper (2) comprises the following components in parts by weight:
70-80 parts of sulfate bleached softwood, 10-20 parts of hardwood pulp board, 8-10 parts of inorganic high-temperature resistant auxiliary agent, 3-5 parts of organic high-temperature resistant auxiliary agent, 1-1.5 parts of high-temperature resistant reinforcing agent, 0.6-0.7 part of sizing agent and 0.3-0.5 part of humidifying reinforcing agent;
the laminating layer (3) is composed of the following components in parts by weight: 50-55 parts of aliphatic polyurethane difunctional acrylate, 10-12 parts of 2 (2-ethoxyethoxy) ethyl acrylate, 6-10 parts of acrylate modified organic silica gel, 6-8 parts of trimethylolpropane triacrylate and 4-5 parts of tripropylene glycol diacrylate.
2. The high-temperature embossing-resistant release paper for producing the PU leather according to claim 1, wherein the inorganic high-temperature-resistant auxiliary agent is SR 004; the organic high-temperature resistant auxiliary agent is a mixture of SR6 and SR 9; the moisturizing enhancer is TH-P50; the sizing agent is AKD.
3. The process for preparing the high-temperature embossing-resistant release paper for producing the PU leather according to any one of claims 1 to 2, which is characterized by sequentially comprising the preparation of base paper, the preparation of a laminating layer, the preparation of an embossing layer and the preparation of a back coating; the preparation of the base paper comprises the following steps:
(1) preparing base paper sizing agent: according to the mass parts of the components of the base paper, soaking a sulfate bleached softwood pulp board and a hardwood pulp board in water for 3-5 hours, pulping by using a pulping machine, concentrating the concentration of the pulp by 10-12%, and pulping in a pulping machine to obtain paper pulp; concentrating the paper pulp, and uniformly dispersing the concentrated paper pulp into a sealed bag to balance moisture for 24 hours at normal temperature;
(2) sheet making: adding a wetting enhancer and an inorganic high-temperature-resistant auxiliary agent into the slurry in sequence, and then fully separating in a fiber separator at the rotation speed of 30000 r/min at the rotation speed of 2900 r/min; making the dispersed slurry into sheets in a sheet making machine;
(3) squeezing and drying: pressing the wet paper sheet obtained by sheet making in an oil press, wherein the pressure is 3.5-4.5MPa, and the pressing time is 30 s; drying the paper sheet obtained after squeezing in a vacuum dryer at the drying temperature of 100 ℃ and 110 ℃ for 2-3min to finally obtain dried base paper;
(4) sizing: sizing the surface of the base paper by using a sizing agent;
(5) pretreatment: drying the sized base paper in a vacuum dryer at the drying temperature of 120 ℃ for 1min, and coating the high-temperature-resistant reinforcing agent and the organic high-temperature-resistant auxiliary agent on the surface of the base paper in a multi-layer coating mode.
4. The process for preparing the high-temperature embossing-resistant release paper for producing the PU leather as claimed in claim 3, wherein the pulping time in the step (1) is 5min, so that the pulping degree of the paper pulp is 30-35 ° SR.
5. The preparation process of the high temperature embossing resistant release paper for producing the PU leather according to claim 3, wherein the preparation of the laminating layer comprises the following steps:
(1) preparing a coating of a laminating layer: weighing aliphatic polyurethane difunctional acrylate, 2 (2-ethoxyethoxy) ethyl acrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate and acrylate-modified organic silica gel according to the mass parts of the components of the curtaining layer, mixing, sealing, putting into a 70 ℃ oven, uniformly stirring, standing to remove bubbles after uniform mixing, and obtaining an acrylate resin mixed solution; adding a photoinitiator into the mixed solution of the acrylate resin, stirring and mixing, placing in a 30 ℃ oven for 4 hours after uniform mixing, and removing bubbles in the mixed solution to obtain the coating of the PE coating;
(2) coating: drying the pretreated base paper in a vacuum drier at 120 ℃ for 1 min; and (3) coating the coating of the laminating layer on the surface of the dried base paper, and then placing the base paper on a pre-opened conveyor belt type UV curing machine for ultraviolet curing to prepare the laminating layer.
6. The process for preparing the high temperature embossing resistant release paper for producing the PU leather according to claim 5, wherein the photoinitiator is a mixture of a photoinitiator 1173 and a photoinitiator 184, and the ratio of the photoinitiator 1173 to the photoinitiator 184 is 1: 1.
7. The preparation process of the high temperature embossing resistant release paper for producing the PU leather according to claim 4, wherein the preparation of the embossing layer comprises the following steps: embossing by using an embossing machine, wherein the speed of the embossing machine is 15m/min, the temperature of the paper surface before entering a pressing area is 160-250 ℃, the temperature of an embossing roller is 30-80 ℃, and a quartz infrared heater of the embossing machine is 15cm away from the paper surface and 5-6cm away from a pressing area.
8. The process for preparing the high-temperature embossing resistant release paper for producing the PU leather according to claim 7, wherein the preparation of the back coating comprises the following steps: carrying out back coating by adopting an air knife coater to obtain the back coating; then, the surface of the electric furnace is pre-dried once at the temperature of 250 ℃ and then is quickly dried in a vacuum drier, wherein the drying temperature is 120 ℃ and the drying time is 1 min.
9. The process for preparing the high temperature embossing resistant release paper for producing the PU leather according to claim 8, wherein the back coating uses acrylamide high molecular substances, the speed of the air knife coater is 200m/min, and the air pressure of the air knife coater is 0.4-0.6Mpa/cm 2.
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| CN114990930A (en) * | 2022-05-28 | 2022-09-02 | 吉翔宝（太仓）离型材料科技发展有限公司 | High-temperature-resistance and solvent-resistance PU leather release paper and preparation process thereof |
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