CN108909119B - PVC (polyvinyl chloride) pre-coating film suitable for vacuum plastic-absorbing process and preparation method and application thereof - Google Patents
PVC (polyvinyl chloride) pre-coating film suitable for vacuum plastic-absorbing process and preparation method and application thereof Download PDFInfo
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- CN108909119B CN108909119B CN201810317722.8A CN201810317722A CN108909119B CN 108909119 B CN108909119 B CN 108909119B CN 201810317722 A CN201810317722 A CN 201810317722A CN 108909119 B CN108909119 B CN 108909119B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/10—Removing layers, or parts of layers, mechanically or chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/06—Interconnection of layers permitting easy separation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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Abstract
The invention discloses a PVC pre-coating film suitable for a vacuum plastic-absorbing process and a preparation method and application thereof. The PVC precoating film suitable for the vacuum forming process comprises a polyvinyl chloride film layer, a double-component polyurethane hot melt adhesive layer and a release film layer which are arranged in sequence and can adjust the melting point. Simultaneously discloses a preparation method of the PVC precoating film suitable for the vacuum forming process and also discloses application of the PVC precoating film suitable for the vacuum forming process. The PVC pre-coating film provided by the invention avoids the complex procedures of gluing and airing single composite base materials one by one in the vacuum plastic-absorbing composite process in the prior art, avoids the pollution of a solvent in glue solution to the operating environment, reduces the labor intensity of workers and improves the production efficiency.
Description
Technical Field
The invention relates to a PVC pre-coating film suitable for a vacuum plastic-absorbing process and a preparation method and application thereof.
Background
The plastic-absorbing board as a novel green environment-friendly material has been widely applied to the aspects of advertisement decoration, interior decoration, automobile interior decoration, refrigerator linings, household electrical housings, movable board doors, movable toilet doors and the like by virtue of the characteristics of light weight, glossy surface, rich colors, flame retardance, heat resistance, moisture resistance, water resistance, heat preservation, sound insulation, shock absorption, static resistance and the like. The plastic-absorbing board has base material comprising density board, fireproof board, shaving board, plywood, fiber board, wood board, etc. and surface vacuum sucking PVC film. The plastic-absorbing board production process in the market at present generally comprises the steps of manually spraying a layer of solvent-type adhesive or water-based adhesive on the surface of a base material, and vacuum-absorbing a PVC film on a board after the solvent is volatilized or the moisture is dried.
The hot melt adhesive is an environment-friendly adhesive which is widely popularized in recent years, has wide application and is deeply welcomed by various industries, and if a PVC pre-coating film suitable for a vacuum plastic suction process can be developed in a hot melt adhesive mode, the hot melt adhesive is a beneficial way for improving the quality of a plastic suction plate, improving the production efficiency and reducing the environmental pollution, and the plastic suction plate has better market prospect. However, the melting points of the hot melt adhesives sold in the current market are higher, and the softening points of the PVC films adopted in the vacuum forming process are lower, so that the hot melt adhesives are not suitable for manufacturing the vacuum forming PVC pre-coating films.
Disclosure of Invention
The invention aims to provide a PVC pre-coating film suitable for a vacuum plastic-suction process and a preparation method and application thereof, which can replace the manual gluing process on the surface of a plastic-suction substrate in the traditional vacuum plastic-suction process, solve various defects generated by manual gluing and improve the production efficiency and the product quality.
The technical scheme adopted by the invention is as follows:
a PVC pre-coated film suitable for vacuum plastic-sucking process is composed of polyvinyl chloride film layers, dual-component hot-melt polyurethane adhesive layer with adjustable smelting point and release film layer.
In the PVC pre-coating film, the adjustable melting point range of the double-component polyurethane hot melt adhesive is 50-110 ℃.
In the PVC pre-coating film, the double-component polyurethane hot melt adhesive capable of adjusting the melting point consists of a component A containing hydroxyl and a component B containing isocyanate; the hydroxyl-containing component A consists of a hydroxyl-terminated base-line polyurethane prepolymer and a multi-component resin mixture; the isocyanate-containing component B is a linear prepolymer with isocyanate groups at two ends.
In the PVC pre-coating film, the release film is one of a polyethylene film, a polypropylene film and release paper which are not subjected to corona treatment.
The preparation method of the PVC precoating film suitable for the vacuum forming process comprises the following steps: the method comprises the following steps:
a) preparing a double-component polyurethane hot melt adhesive with an adjustable melting point: mixing and stirring the component A and the component B of the polyurethane hot melt adhesive to obtain a double-component polyurethane hot melt adhesive with adjustable melting point;
b) preparing a PVC pre-coating film: coating the double-component polyurethane hot melt adhesive with adjustable melting point on a release film, drying the solvent, compounding the PVC film and the release film, rolling and curing to obtain the PVC pre-coated film suitable for the vacuum plastic uptake process.
In the step a) of the preparation method of the PVC pre-coating film, the mass ratio of the component A to the component B of the polyurethane hot melt adhesive is (40-80): (20-60).
In the step b) of the preparation method of the PVC precoating film, the coating thickness is controlled to be 0.01 mm-0.08 mm.
In the step b) of the preparation method of the PVC precoating film, the curing is carried out for 60 to 80 hours at normal temperature or for 24 hours at 50 to 60 ℃.
The PVC pre-coated film suitable for the vacuum plastic-absorbing process is applied to preparing a vacuum plastic-absorbing plate or a vacuum plastic-absorbing film.
Such applications are in particular: cutting the PVC pre-coating film into membranes with the same size as the base material to be compounded, removing the release film, laying the PVC pre-coating film on the base material to be compounded, and performing vacuum plastic-suction compounding and hot-press bonding to obtain the vacuum plastic-suction board.
The invention has the beneficial effects that:
the PVC pre-coating film provided by the invention avoids the complex procedures of gluing and airing single composite base materials one by one in the vacuum plastic-absorbing composite process in the prior art, avoids the pollution of a solvent in glue solution to the operating environment, reduces the labor intensity of workers and improves the production efficiency.
Compared with the prior art, the invention has the following advantages:
1) the plastic suction process is simple, environment-friendly and pollution-free. The vacuum plastic suction process adopting the PVC pre-coating film can carry out plastic suction compounding only by adjusting the compounding temperature to the melting point of the hot melt adhesive, does not need procedures of glue brushing, air drying and the like, and the PVC pre-coating film can not generate any toxic, harmful and volatile substances in the plastic suction process.
2) The production efficiency is high. The PVC pre-coating film is processed by a coating machine in a coiling way, and the production efficiency is improved by times compared with the working procedures of single-piece gluing and airing of the PVC film on the base material.
3) The plastic-absorbing plate made of the PVC precoating film has good appearance quality. The PVC pre-coating film is coated by a coating machine, the coating is uniform, the thickness is consistent, the phenomena of manual spraying, uneven thickness of a glue layer formed by coating glue, flow marks and the like can not occur, and the appearance quality of the plastic suction plate is greatly improved.
4) The PVC film is firmly bonded with the base material. The double-component polyurethane adhesive has strong adhesive force to PVC films, density boards, fireproof boards, shaving boards, plywood, fiber boards, wood boards and other boards, the base materials can be firmly combined together after the hot melt adhesive is melted, the film layer of the prepared PVC plastic suction board is not easy to fall off, and the water-based adhesive used in the existing PVC vacuum plastic suction process often has the phenomenon of adhesion and falling off.
5) Can be used for preparing a PVC precoating film with low softening point. Because the melting point range of the adopted hot melt adhesive is adjustable, the PVC film with low softening point can be coated, and the application range is wide.
Detailed Description
The PVC precoating film suitable for the vacuum plastic suction process comprises a polyvinyl chloride film layer, a double-component polyurethane hot melt adhesive layer with adjustable melting point and a release film layer which are sequentially arranged.
Preferably, in the PVC pre-coating film, the adjustable melting point range of the two-component polyurethane hot melt adhesive is 50-110 ℃; furthermore, the adjustable melting point range of the double-component polyurethane hot melt adhesive is 60-90 ℃.
Preferably, in the PVC precoating film, the double-component polyurethane hot melt adhesive capable of adjusting the melting point consists of a component A containing hydroxyl and a component B containing isocyanate; the specific technical content of the hot melt adhesive of the double-component polyurethane hot melt adhesive layer with the adjustable melting point is disclosed in CN107418478A, which is produced by Jinghui Ming science and technology Limited in Fushan City.
Preferably, in the PVC precoating film, the release film is one of a polyethylene film, a polypropylene film and a release paper which are not subjected to corona treatment.
The preparation method of the PVC precoating film suitable for the vacuum forming process comprises the following steps: the method comprises the following steps:
a) preparing a double-component polyurethane hot melt adhesive with an adjustable melting point: mixing and stirring the component A and the component B of the polyurethane hot melt adhesive to obtain a double-component polyurethane hot melt adhesive with adjustable melting point;
b) preparing a PVC pre-coating film: coating the double-component polyurethane hot melt adhesive with adjustable melting point on a release film, drying the solvent, compounding the PVC film and the release film, rolling and curing to obtain the PVC pre-coated film suitable for the vacuum plastic uptake process.
Preferably, in the step a) of the preparation method of the PVC precoating film, the mass ratio of the component A to the component B of the polyurethane hot melt adhesive is (40-80): (20-60).
Further, the step b) of the preparation method of the PVC pre-coating film is specifically that the double-component polyurethane hot melt adhesive obtained in the step a) is added into a glue applying groove, the glue solution is uniformly coated on the release film by a rubber roller rolled by a coating machine, the solvent is dried through a drying channel, the PVC film and the release film are compounded by rolling by a hot pressing roller, and the PVC pre-coating film suitable for the vacuum plastic uptake process is obtained after rolling and curing.
Preferably, in the step b) of the preparation method of the PVC precoating film, the coating thickness of the double-component polyurethane hot melt adhesive with adjustable melting point is controlled to be 0.01-0.08 mm; more preferably 0.02mm to 0.06 mm.
Preferably, in the step b) of the preparation method of the PVC precoating film, the curing is performed for 60 to 80 hours at normal temperature, and more preferably for 72 hours at normal temperature; or curing for 24 hours at 50-60 ℃.
Furthermore, the set melting point of the two-component polyurethane hot melt adhesive is determined according to the softening point of a PVC film required by the plastic suction plate and the using process of the coating machine, and the melting point can be adjusted through different proportions of the component A and the component B.
The PVC pre-coated film suitable for the vacuum plastic-absorbing process is applied to preparing a vacuum plastic-absorbing plate or a vacuum plastic-absorbing film.
Furthermore, the PVC precoating film is suitable for a vacuum plastic-sucking machine to heat, vacuum and suck the PVC precoating film to compound the PVC precoating film on plates such as density boards, fireproof boards, shaving boards, plywood, fiberboards, wood boards and the like to manufacture various plastic-sucking plates, and vacuum hot-pressing, sucking and compounding to manufacture films of various special-shaped materials.
Such applications are in particular: cutting the PVC pre-coating film into membranes with the same size as the base material to be compounded, removing the release film, laying the PVC pre-coating film on the base material to be compounded, and performing vacuum plastic-suction compounding and hot-press bonding to obtain the vacuum plastic-suction board.
Preferably, in the application, the substrate to be compounded is one of density boards, fireproof boards, shaving boards, plywood, fiber boards and wood boards.
Preferably, in application, the temperature of vacuum plastic-suction compounding is 170-220 ℃ and the time is 90-180 s.
The contents of the present invention are further explained below:
the PVC precoating film of the invention is a film type material specially used for manufacturing PVC plastic suction plates. When the PVC plastic-absorbing plate is processed, the PVC pre-coating film is cut into a film sheet with the same size as the substrate (plate), the release film covered on the surface of the PVC pre-coating film is removed, the PVC pre-coating film is flatly laid on the plate and placed in a vacuum plastic-absorbing machine, the PVC pre-coating film is heated to the melting point of the hot melt adhesive, the vacuum pumping is performed for hot-pressing compounding, and the PVC plastic-absorbing plate is prepared after cooling to the room temperature. The whole PVC plastic-absorbing plate is not glued manually in the manufacturing process, so that the procedures of drying solvents and moisture are avoided, the environmental pollution is reduced, and the production efficiency is improved.
The heating temperature of the vacuum plastic-absorbing machine is determined by the melting point of the double-component polyurethane hot melt adhesive coated on the PVC precoating film, and in order to ensure that the PVC film can be well and plastically deformed to be tightly attached to the plate, the melting point of the hot melt adhesive is close to the softening point of the PVC film. Therefore, after the type (softening point) of the PVC film is determined, the melting point of the hot melt adhesive is determined by adjusting the ratio of the two components of the two-component polyurethane hot melt adhesive.
The PVC precoating film can be processed at room temperature by a common coating compound machine, and a special hot melt adhesive heating and melting machine head is not needed.
The preparation of the PVC pre-coating film is carried out at room temperature, the rolling rubber roll uniformly coats the glue solution in the glue tank on the release film, the solvent is dried through the drying channel, the hot-pressing roll rolls and compounds the PVC film and the release film, the glue on the release film is transferred to the PVC film, and the release film plays a role of an isolation film layer when being rolled. The PVC pre-coated film is stored for 72 hours at room temperature or cured for 24 hours at 50-60 ℃ after being wound, so that the adhesive is cured; the solvent of the release film passing through the drying tunnel can be collected for the next use.
The PVC pre-coating film is prepared by pre-coating glue solution on a coiled PVC film, drying and rolling, and the subsequent processes can realize firm bonding of the PVC film and a base material only by heating the PVC pre-coating film to be more than the melting point of the glue solution, so that the processes of gluing and airing a single base material are avoided, the production efficiency is greatly improved, the product quality is improved, and the environmental pollution and the physical injury to production operators are reduced.
The present invention will be described in further detail with reference to specific examples. The starting materials used in the examples are, unless otherwise specified, commercially available from conventional sources.
Example 1:
a. preparation of double-component polyurethane hot melt adhesive with set melting point
100Kg of the component A and 33Kg of the component B of the polyurethane hot melt adhesive are added into a mixer, fully and uniformly stirred, and the two-component polyurethane hot melt adhesive with the melting point of 70 ℃ is obtained after coating, drying and curing.
b. Preparation of PVC precoating film
And (b) adding the double-component polyurethane hot melt adhesive obtained in the step a into an adhesive applying groove, uniformly coating the adhesive solution on a PP (polypropylene) film by a rolling rubber roll, controlling the coating thickness to be 0.02mm, drying the solvent by a drying tunnel, controlling the temperature of the drying tunnel to be 100 ℃, rolling and compounding the PVC film and the PP film by a hot pressing roller, rolling, and curing at room temperature for 72 hours to obtain the PVC pre-coating film suitable for the vacuum plastic uptake process.
c. Preparing PVC plastic uptake density board
Cutting the PVC pre-coating film into a film sheet with the size basically the same as that of the density board to be compounded, removing the PP film covered on the surface of the PVC pre-coating film, flatly paving the PVC pre-coating film on the density board, putting the density board into a vacuum plastic uptake machine, controlling the temperature to be 180 ℃, heating for 170 seconds, vacuumizing, carrying out plastic uptake and hot pressing, and cooling to room temperature to obtain the density board type PVC plastic uptake board. The 180 degree peel strength test was performed according to/T2790-1995 "adhesive 180 degree peel strength test method flexible material vs. rigid material" and the PVC film was torn.
Example 2:
a. preparation of double-component polyurethane hot melt adhesive with set melting point
100Kg of the component A and 45Kg of the component B of the polyurethane hot melt adhesive are added into a mixer, fully and uniformly stirred, and the two-component polyurethane hot melt adhesive with the melting point of 80 ℃ is obtained after coating, drying and curing.
b. Preparation of PVC precoating film
And (b) adding the double-component polyurethane hot melt adhesive obtained in the step a into a glue application tank, uniformly coating the glue solution on a PP (polypropylene) film by a rolling rubber roll, controlling the coating thickness to be 0.025mm, drying the solvent by a drying tunnel, controlling the temperature of the drying tunnel to be 95 ℃, rolling and compounding the PVC film and the PP film by a hot pressing roll, rolling, curing in a drying room at 50 ℃ for 24 hours, and obtaining the PVC pre-coated film suitable for the vacuum plastic uptake process.
c. Preparation of PVC plastic uptake fire-proof plate
Cutting the PVC pre-coating film into a film sheet with the size basically the same as that of the fireproof plate to be compounded, removing the PP film covered on the surface of the PVC pre-coating film, flatly laying the PVC pre-coating film on the fireproof plate and putting the fireproof plate into a vacuum plastic uptake machine, controlling the temperature to be 185 ℃, heating for 150 seconds, vacuumizing, carrying out plastic uptake and hot pressing, and cooling to room temperature to obtain the fireproof plate type PVC plastic uptake plate. The 180 degree peel strength test was performed according to/T2790-1995 "adhesive 180 degree peel strength test method flexible material vs. rigid material" and the PVC film was torn.
Example 3:
a. preparation of double-component polyurethane hot melt adhesive with set melting point
100Kg of the component A and 50Kg of the component B of the polyurethane hot melt adhesive are added into a mixer, fully and uniformly stirred, and the two-component polyurethane hot melt adhesive with the melting point of 84.5 ℃ is obtained after coating, drying and curing.
b. Preparation of PVC precoating film
And (b) adding the double-component polyurethane hot melt adhesive obtained in the step a into an adhesive applying tank, uniformly coating the adhesive solution on a PE (polyethylene) film by a rolling rubber roll, controlling the coating thickness to be 0.05mm, drying the solvent by a drying tunnel, controlling the temperature of the drying tunnel to be 70 ℃, rolling and compounding the PVC film and the PE film by a hot pressing roller, rolling, curing at room temperature for 72 hours, and obtaining the PVC precoating film suitable for the vacuum plastic uptake process.
c. Preparation of PVC plastic-absorbing shaving board
Cutting the PVC precoating film into sheets with the size basically the same as that of a shaving board to be compounded, removing the PE film covered on the surface of the PVC precoating film, then flatly laying the PVC precoating film on the shaving board and putting the shaving board into a vacuum plastic uptake machine, controlling the temperature to be 190 ℃, heating for 120 seconds, vacuumizing for plastic uptake thermal compounding, and cooling to room temperature to obtain the shaving board type PVC plastic uptake board. The 180 degree peel strength test was performed according to/T2790-1995 "adhesive 180 degree peel strength test method flexible material vs. rigid material" and the PVC film was torn.
Example 4:
a. preparation of double-component polyurethane hot melt adhesive with set melting point
100Kg of the component A and 60Kg of the component B of the polyurethane hot melt adhesive are added into a mixer, fully and uniformly stirred, and the two-component polyurethane hot melt adhesive with the melting point of 90 ℃ is obtained after coating, drying and curing.
b. Preparation of PVC precoating film
And (b) adding the double-component polyurethane hot melt adhesive obtained in the step a into an adhesive applying groove, uniformly coating the adhesive solution on release paper by a rolling rubber roll, controlling the coating thickness to be 0.06mm, drying the solvent by a drying tunnel, controlling the temperature of the drying tunnel to be 60 ℃, rolling and compounding the PVC film and the release paper by a hot pressing roll, rolling, curing in a drying room at the temperature of 60 ℃ for 24 hours, and obtaining the PVC precoating film suitable for the vacuum plastic uptake process.
c. Preparation of PVC plastic uptake wooden door plate
Cutting the PVC pre-coating film into sheets with the size basically the same as that of the wood door plate to be compounded, removing release paper covered on the surface of the PVC pre-coating film, flatly laying the PVC pre-coating film on the wood door plate, putting the wood door plate into a vacuum plastic sucking machine, controlling the temperature to be 200 ℃, heating for 100 seconds, vacuumizing, carrying out plastic sucking and hot pressing, and cooling to room temperature to obtain the wood plate type PVC plastic sucking plate. The 180 degree peel strength test was performed according to/T2790-1995 "adhesive 180 degree peel strength test method flexible material vs. rigid material" and the PVC film was torn.
Example 5:
a. preparation of double-component polyurethane hot melt adhesive with set melting point
100Kg of the component A and 55Kg of the component B of the polyurethane hot melt adhesive are added into a mixer, fully and uniformly stirred, and the two-component polyurethane hot melt adhesive with the melting point of 87 ℃ is obtained after coating, drying and curing.
b. Preparation of PVC precoating film
And (b) adding the double-component polyurethane hot melt adhesive obtained in the step a into an adhesive applying groove, uniformly coating the adhesive solution on release paper by a rolling rubber roll, controlling the coating thickness to be 0.05mm, drying the solvent by a drying tunnel, controlling the temperature of the drying tunnel to be 60 ℃, rolling and compounding the PVC film and the release paper by a hot pressing roll, rolling, curing in a drying room at the temperature of 60 ℃ for 24 hours, and obtaining the PVC precoating film suitable for the vacuum plastic uptake process.
c. Preparation of PVC-coated Density Board
Cutting the PVC pre-coating film into sheets with the size basically the same as that of the wood door sheet to be compounded, removing release paper covered on the surface of the PVC pre-coating film, then spreading the PVC pre-coating film on a density batten, controlling the temperature of a coating machine to be 200 ℃, carrying out hot-pressing compounding, and cooling to room temperature to obtain the density board type PVC skirting. The 180 degree peel strength test was performed according to/T2790-1995 "adhesive 180 degree peel strength test method flexible material vs. rigid material" and the PVC film was torn.
Claims (5)
1. The utility model provides a PVC membrane of precoating suitable for vacuum plastic uptake technology which characterized in that: the adhesive is composed of a polyvinyl chloride film layer, a double-component polyurethane hot melt adhesive layer with adjustable melting point and a release film layer which are arranged in sequence;
the double-component polyurethane hot melt adhesive with the adjustable melting point consists of a component A containing hydroxyl and a component B containing isocyanic acid radical; the hydroxyl-containing component A consists of a hydroxyl-terminated base-line polyurethane prepolymer and a multi-component resin mixture; the isocyanate-containing component B is a linear prepolymer with isocyanate groups at two ends; the adjustable melting point range of the two-component polyurethane hot melt adhesive is 50-110 ℃;
the PVC pre-coating film suitable for the vacuum plastic-absorbing process is prepared by the following preparation method:
a) preparing a double-component polyurethane hot melt adhesive with an adjustable melting point: mixing and stirring the component A and the component B of the polyurethane hot melt adhesive to obtain a double-component polyurethane hot melt adhesive with adjustable melting point;
b) preparing a PVC pre-coating film: coating the double-component polyurethane hot melt adhesive with adjustable melting point on a release film, drying the solvent, compounding the PVC film and the release film, rolling and curing to obtain a PVC pre-coating film suitable for a vacuum plastic uptake process;
in the step a), the mass ratio of the component A to the component B of the polyurethane hot melt adhesive is (40-80): (20-60);
in the step b), curing is carried out for 60-80 h at normal temperature, or curing is carried out for 24h at 50-60 ℃;
in the step b), the coating thickness is controlled to be 0.01 mm-0.08 mm;
the plastic uptake board base material of the PVC precoating film is a density board, a fireproof board, a shaving board, a plywood, a fiberboard and a wood board.
2. The PVC precoating film suitable for vacuum forming process according to claim 1, characterized in that: the release film is one of polyethylene film, polypropylene film and release paper which are not subjected to corona treatment.
3. The method for preparing the PVC precoating film suitable for the vacuum forming process of claim 1 or 2, wherein the method comprises the following steps: the method comprises the following steps:
a) preparing a double-component polyurethane hot melt adhesive with an adjustable melting point: mixing and stirring the component A and the component B of the polyurethane hot melt adhesive to obtain a double-component polyurethane hot melt adhesive with adjustable melting point;
b) preparing a PVC pre-coating film: coating the double-component polyurethane hot melt adhesive with adjustable melting point on a release film, drying the solvent, compounding the PVC film and the release film, rolling and curing to obtain a PVC pre-coating film suitable for a vacuum plastic uptake process;
in the step a), the mass ratio of the component A to the component B of the polyurethane hot melt adhesive is (40-80): (20-60);
in the step b), curing is carried out for 60-80 h at normal temperature, or curing is carried out for 24h at 50-60 ℃;
in the step b), the coating thickness is controlled to be 0.01 mm-0.08 mm.
4. Use of a PVC precoat film according to claim 1 or 2 suitable for vacuum forming process for the preparation of vacuum formed sheets.
5. Use according to claim 4, characterized in that: cutting the PVC pre-coating film into membranes with the same size as the base material to be compounded, removing the release film, laying the PVC pre-coating film on the base material to be compounded, and performing vacuum plastic-suction compounding and hot-press bonding to obtain the vacuum plastic-suction board.
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| CN112961640B (en) * | 2021-02-05 | 2023-01-24 | 华威粘结材料（上海）股份有限公司 | Polyurethane adhesive film used as absorbent plastic and preparation method and application thereof |
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