Preparation method of self-adhesive protective film for real stone paint thermal insulation decorative integrated board

Abstract

The present invention belongs to the technical field of polymer material preparation, and discloses a method for preparing a self-adhesive protective film for a real stone paint thermal insulation decorative integrated board, wherein LDPE, TPE, tackifying resin, masterbatch and opening agent are first mixed in certain mass fractions and then added into a three-layer co-extrusion blow molding machine or a casting machine hopper, and the raw materials are stirred and melted and extruded by the screw of the three-layer co-extrusion blow molding machine or the casting machine; then the extruded material is extruded through an extrusion die head, and then cooled to form a preliminary film, and after cooling to room temperature, the film is trimmed by a cutter and then wound by a winder to obtain a formed product. The present invention only needs one film-making process to be made, which improves processing efficiency, is environmentally friendly, and has excellent coating effect.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a method for preparing a self-adhesive protective film for a real stone paint thermal insulation decorative integrated board. Background Art

[0002] Protective film is a film-like material that has a protective function for other materials. It is usually made of polyolefin plastic film or kraft paper as the base material and rubber or acrylic resin as the pressure-sensitive adhesive through a special process. It is attached to the surface of the protected material such as metal plates, plastic plates, stone, wood, glass, etc. to protect it from corrosion by harmful gases and microorganisms during manufacturing, transportation, storage and processing, and to prevent dust pollution and mechanical scratches. In addition, during the bending and stretching process, it provides lubrication for the material and the mold, thereby improving processing operability.

[0003] Because the real stone paint insulation integrated board contains natural stone powder, the board surface is relatively rough, which requires that the pressure-sensitive adhesive used in the protective film must have the characteristics of high cohesive strength and high viscosity. Although the solvent-based (oily) acrylic pressure-sensitive adhesive can meet the above requirements, a large amount of volatile organic gas is generated during the production process, resulting in high VOC emissions, which not only causes serious pollution to the environment, but also brings great harm to the health of production employees.

[0004] With the strengthening of environmental awareness, emulsion (water-based) pressure-sensitive adhesives have developed rapidly. However, the cohesive strength and viscosity of the general emulsion acrylic pressure-sensitive adhesive protective film cannot reach the performance of solvent-based glue. The protective film is easily peeled off when pasting the real stone paint thermal insulation integrated board surface, which cannot effectively protect the board surface.

[0005] Moreover, both emulsion-type and solvent-type pressure-sensitive adhesive protective films require two steps of preparing a base film and then coating the corresponding pressure-sensitive adhesive, and the production process is cumbersome. Therefore, new products that overcome the above defects are urgently needed to meet market needs. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a method for preparing a self-adhesive protective film for a real stone paint thermal insulation decorative integrated panel, which overcomes the defects in the prior art and can be made by only one film-making process, thereby improving processing efficiency, being environmentally friendly, and having excellent coating effect.

[0007] In order to solve the above technical problems, the technical solution of the present invention is:

[0008] A method for preparing a self-adhesive protective film for a real stone paint thermal insulation decorative integrated board, wherein the self-adhesive protective film comprises a TPE (thermoplastic elastomer) layer, a first LDPE (low-density polyethylene) layer and a second LDPE (low-density polyethylene) layer, wherein the first LDPE layer is located between the TPE layer and the second LDPE layer; the TPE layer is composed of 70 parts by mass of TPE and 30 parts by mass of a tackifying resin, the first LDPE layer is composed of 95-100 parts by mass of LDPE and 0-5 parts by mass of a black masterbatch, and the second LDPE layer is composed of 66-97 parts by mass of LDPE, 0-30 parts by mass of a white masterbatch and 1.5-3 parts of an opening agent;

[0009] The method for preparing the self-adhesive protective film comprises the following steps:

[0010] a. LDPE, TPE, tackifying resin, masterbatch and anti-blocking agent are mixed in certain mass proportions and added into the hopper of a three-layer co-extrusion blow molding machine or a casting machine. The raw materials are stirred and melted and extruded by the screw of the three-layer co-extrusion blow molding machine or the casting machine;

[0011] b. The extruded material is extruded through a blow molding die and then cooled to form a preliminary film;

[0012] c. After the initial forming, the film is fully cooled, trimmed by a cutter, and then wound by a winder to obtain a formed product.

[0013] Preferably, the thickness of the self-adhesive protective film is 60-100 μm, wherein the thickness of the TPE layer accounts for 20-30% of the total thickness, and the thickness of the first LDPE layer and the second LDPE layer respectively account for 30-40% of the total thickness.

[0014] Furthermore, the thickness of the self-adhesive protective film is 80 μm, wherein the thickness of the TPE layer is 20 μm, and the thickness of the first LDPE layer and the second LDPE layer are 30 μm respectively.

[0015] Preferably, the first LDPE layer is composed of 97 parts by weight of LDPE and 3 parts by weight of black masterbatch; the second LDPE layer is composed of 78 parts by weight of LDPE, 20 parts by weight of white masterbatch and 2 parts of opening agent. The opening agent is added to the second LDPE layer, which contacts the TPE adhesive layer after winding, so that it is convenient to unwind when the product is used.

[0016] Preferably, the TPE is MD6700TPE (produced by PolyOne Polymers (Suzhou) Co., Ltd.), the tackifying resin is tackifying resin T100, the LDPE is Huizhou CNOOC Shell 2420H LDPE, the black masterbatch is E0005C black masterbatch (Jiangsu Pleco Hongmei Masterbatch Co., Ltd.), the white masterbatch is SE8665 white masterbatch (Jiangsu Pleco Hongmei Masterbatch Co., Ltd.), and the opening agent is SAB-8238 opening agent.

[0017] Preferably, in step a, the temperature of each section of the screw of the three-layer co-extrusion blow molding machine or the casting machine is gradually increased from 140°C to 180°C, and the screw stirring speed is 20-100 rpm. The material extrusion speed varies with the stirring speed.

[0018] Preferably, in step b, the material extrusion speed is 20-40 m / min, and the material is cooled to 40-60°C.

[0019] Preferably, the temperature in step c is fully cooled to room temperature.

[0020] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] The invention only needs one process to be manufactured, the production is easy to control, the production cost is low, and the production efficiency is improved; and there is no VOC emission during the preparation process, which is environmentally friendly; compared with the existing adhesive protective film, the manufactured product has a good coating effect and will not fall off; therefore, it has broad market prospects.

[0022] In summary, the present invention can be manufactured by only one film-making process, thereby improving processing efficiency, being environmentally friendly, and having excellent lamination effect. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below in conjunction with embodiments:

[0024] Embodiment 1:

[0025] The total thickness of the self-adhesive protective film for the real stone paint thermal insulation decorative integrated board is 60μm, the thickness of the TPE layer accounts for 20% of the total thickness, and the first LDPE layer and the second LDPE layer account for 40% of the total thickness respectively.

[0026] The TPE layer is composed of 70 parts by weight of MD6700 TPE (thermoplastic elastomer) produced by PolyOne and 30 parts by weight of tackifying resin T100; the first LDPE layer is entirely composed of LDPE (low-density polyethylene) CNOOC Shell 2420H; the second LDPE layer is composed of 97 parts by weight of LDPE (low-density polyethylene) and 3 parts by weight of SAB-8238 anti-blocking agent.

[0027] The production of self-adhesive protective film for real stone paint thermal insulation integrated board includes the following steps:

[0028] Step 1: The above LDPE, TPE, tackifying resin and opening agent are mixed in parts by mass and added into the hopper of the tape casting machine. The temperature of each section of the screw is gradually increased from 140°C to 180°C. The raw materials are stirred and melted and extruded through the tape casting machine. The stirring speed is determined according to the selection of the tape casting machine.

[0029] Step 2: The extruded material flows out through a blow molding die, and then is cooled to 40°C to initially form a film, which includes a TPE layer, a first LDPE layer, and a second LDPE layer;

[0030] Step 3: The initially formed film is fully cooled to room temperature, then trimmed by a trimming machine and then rolled up by a winder to form a self-adhesive protective film.

[0031] Because no masterbatch raw materials are added during the production process, the finished product is a transparent protective film.

[0032] Embodiment 2:

[0033] The self-adhesive protective film for the real stone paint thermal insulation decorative integrated board has a total thickness of 100μm, the thickness of the TPE layer accounts for 30% of the total thickness, and the first LDPE layer and the second LDPE layer account for 35% of the total thickness respectively.

[0034] The TPE layer is composed of 70 parts by weight of MD6700 TPE produced by PolyOne and 30 parts by weight of tackifying resin T100; the first LDPE layer is composed of 95 parts by weight of LDPE CNOOC Shell 2420H and 5 parts by weight of E0005C black masterbatch; the second LDPE layer is composed of 68.5 parts by weight of LDPE, 30 parts of SE8665 white masterbatch and 1.5 parts by weight of SAB-8238 anti-blocking agent.

[0035] The production of self-adhesive protective film for real stone paint thermal insulation integrated board includes the following steps:

[0036] Step 1: The above LDPE, TPE, tackifying resin and anti-blocking agent are mixed in parts by mass and added into a three-layer co-extrusion blow molding machine. The temperature of each section of the screw is gradually increased from 140°C to 180°C. The raw materials are stirred and melted and extruded by the three-layer co-extrusion blow molding machine. The stirring speed is determined according to the selection of the three-layer co-extrusion blow molding machine.

[0037] Step 2: The extruded material flows out through the extrusion die head and then is cooled to 60°C to initially form a film, which includes a TPE layer, a first LDPE layer and a second LDPE layer;

[0038] Step 3: The initially formed film is fully cooled to room temperature, then trimmed by a trimming machine and then rolled up by a winder to form a self-adhesive protective film.

[0039] Because masterbatch raw materials are added during the production process, the finished product is a protective film with one side black and the other side white, and the black side has self-adhesive properties.

[0040] Embodiment 3:

[0041] The self-adhesive protective film for the real stone paint thermal insulation decorative integrated board has a total thickness of 80μm, the thickness of the TPE layer accounts for 25% of the total thickness, and the first LDPE layer and the second LDPE layer account for 37.5% of the total thickness respectively.

[0042] The TPE layer is composed of 70 parts by weight of MD6700 TPE produced by PolyOne and 30 parts by weight of tackifying resin T100; the first LDPE layer is composed of 97 parts by weight of LDPE CNOOC Shell 2420H and 3 parts by weight of E0005C black masterbatch; the second LDPE layer is composed of 78 parts by weight of LDPE, 20 parts of SE8665 white masterbatch and 2 parts by weight of SAB-8238 anti-blocking agent.

[0043] The production of self-adhesive protective film for real stone paint thermal insulation integrated board includes the following steps:

[0044] Step 1: The above LDPE, TPE, tackifying resin and anti-blocking agent are mixed in parts by mass and added into a three-layer co-extrusion blow molding machine. The temperature of each section of the screw is gradually increased from 140°C to 180°C. The raw materials are stirred and melted and extruded by the three-layer co-extrusion blow molding machine. The stirring speed is determined according to the selection of the three-layer co-extrusion blow molding machine.

[0045] Step 2: The extruded material flows out through the extrusion die, and then is cooled to 50°C to initially form a film, which includes a TPE layer, a first LDPE layer and a second LDPE layer;

[0046] Step 3: The initially formed film is fully cooled to room temperature, then trimmed by a trimming machine and then rolled up by a winder to form a self-adhesive protective film.

[0047] Because masterbatch raw materials are added during the production process, the finished product is a protective film with one side black and the other side white, and the black side has self-adhesive properties.

[0048] Comparison example:

[0049] The prior art preparation method is usually to apply a protective film with glue, which is divided into two steps;

[0050] The first process is to use a blow molding machine or a cast film machine to prepare a PE base film of a certain thickness, usually 60 to 80 μm, and the adhesive surface is corona treated. The base film preparation includes the following steps:

[0051] Step 1: LDPE (low-density polyethylene), LLDPE (linear low-density polyethylene), and the opening agent are mixed in certain mass fractions and added into the blow molding machine. The temperature of each section of the screw is gradually increased from 140°C to 180°C. The raw materials are stirred and melted and extruded through the blow molding machine;

[0052] Step 2: The extruded material flows out through the blow molding die, and then is cooled to 50°C to initially form a film. The outer coating surface of the film is treated with corona by a corona machine to make its surface tension reach 40 dynes or above;

[0053] Step 3: After the initial forming, the film is fully cooled to room temperature, then trimmed by a trimming machine and then rolled up by a winder to form a PE base film.

[0054] In the second process, the PE base film prepared in the first process is unwound by a coating machine and coated with a solvent-based pressure-sensitive adhesive (the solvent is generally ethyl acetate or toluene) on the coating head, with a glue amount of 60g / m 2 The glue-coated film is dried in a 7-section oven and then rolled up at the winding part of the coating machine to form a glue-coated protective film.

[0055] Test results of each embodiment and control example product:

[0056] The performance of the 60 μm, 100 μm, and 80 μm self-adhesive protective films made by the present invention in Examples 1 to 3 was compared with the adhesive-coated protective films made by the prior art, and the obtained data are shown in Table 1:

[0057] Table 1 Comparison of product inspection results between the present invention and the prior art

[0058]

[0059] Note: The effect of laminating with the real stone paint board is that the protective film is laminated onto the real stone paint board under the pressure of the laminating roller (2-10kg), and the sample is placed vertically for a period of time after laminating.

[0060] Conclusion: From the above comparison, it can be seen that the product prepared by the present invention optimizes the two-step production process of the prior art to only one step compared with the product of the prior art, and solves the problem of high VOC emissions in the coating process of the prior art; the viscosity of the product prepared by the present invention is significantly higher than that of the prior art product, and the coating effect is better than that of the prior art product.

[0061] It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope limited by the appended claims of the application.

Claims

1. A method for preparing a self-adhesive protective film for a real stone paint thermal insulation decorative integrated board, characterized in that: The self-adhesive protective film comprises a TPE layer, a first LDPE layer and a second LDPE layer, wherein the first LDPE layer is located between the TPE layer and the second LDPE layer; the TPE layer is composed of 70 parts by mass of TPE and 30 parts by mass of a tackifying resin, the first LDPE layer is composed of 97 parts by mass of LDPE and 3 parts by mass of a black masterbatch, and the second LDPE layer is composed of 78 parts by mass of LDPE, 20 parts by mass of a white masterbatch and 2 parts of an anti-blocking agent; the thickness of the self-adhesive protective film is 60 to 100 μm; The thickness of the TPE layer accounts for 20-30% of the total thickness, and the thickness of the first LDPE layer and the second LDPE layer account for 30-40% of the total thickness respectively; The method for preparing the self-adhesive protective film comprises the following steps: a. LDPE, TPE, tackifying resin, masterbatch and anti-blocking agent are mixed in certain mass proportions and added into the hopper of a three-layer co-extrusion blow molding machine or a casting machine. The raw materials are stirred and melted and extruded by the screw of the three-layer co-extrusion blow molding machine or the casting machine; wherein, the temperature of each section of the screw of the three-layer co-extrusion blow molding machine or the casting machine is gradually increased from 140°C to 180°C, and the screw stirring speed is 20-100rpm; b. The extruded material is extruded through an extrusion die, and then cooled to form a preliminary film; wherein the material extrusion speed is 20 to 40 m / min, and cooled to 40 to 60°C; c. After the initial forming, the film is fully cooled to room temperature, trimmed by a cutter, and then wound by a winder to obtain a formed product.

2. The method for preparing the self-adhesive protective film for the real stone paint thermal insulation decorative integrated board according to claim 1, characterized in that: The thickness of the self-adhesive protective film is 80 μm, wherein the thickness of the TPE layer is 20 μm, and the thickness of the first LDPE layer and the second LDPE layer are 30 μm respectively.

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