Preparation method of environment-friendly PVC plate

Abstract

The invention discloses a preparation method of an environment-friendly PVC plate. The preparation method comprises the following steps: S1, preparing production raw materials; s2, segmented feeding and mixing are conducted, specifically, polyvinyl chloride resin and a calcium-zinc stabilizer are mixed firstly, and then ground calcium carbonate, dioctyl terephthalate and a flame retardant are sequentially added; s3, stirring the mixture at a high speed to ensure full melting; s4, extruding and feeding the uniformly mixed raw materials into a press, and pressing the mixture into a PVC board with a set specification at high temperature and high pressure; s5, cooling the PVC plate discharged from the pressing machine; s6, the cooled PVC plate is cut according to the set size; s7, the edge of the PVC plate is trimmed, so that the edge of the PVC plate is smooth; in the production process, no toxic gas is released when the PVC board is used, the environmental protection standard is met, and personal health and safety are ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of PVC plate, and particularly relates to a preparation method of environment-friendly PVC plate. BACKGROUND

[0002] PVC plate is used for surface packaging of various types of panels, and is also called decorative film or adhesive film, and is applied to building materials, packaging, medicine and many other industries. The building material industry accounts for the largest proportion, followed by the packaging industry, and then other small range of application industries. According to the softness and hardness, it can be divided into soft PVC plate and hard PVC plate; according to the manufacturing process, it can be divided into PVC skin foaming plate and PVC free foaming plate; according to the transparency and opacity, it can be divided into PVC transparent plate and PVC plate.

[0003] The existing PVC plate uses additives containing formaldehyde, such as plasticizers and stabilizers, in the production process. When high-temperature shaping, these additives will decompose and release formaldehyde. If the production environment is poorly ventilated or the temperature is not properly controlled, the formaldehyde content will exceed the standard. The resin and plasticizer in the PVC plate will volatilize chloroethylene, benzene, toluene and other volatile organic compounds at high temperatures. These volatile organic compounds have a stimulating effect on the respiratory system, and long-term contact will affect health. The plasticizer (such as phthalate) used in the production of PVC plate will partially volatilize at high temperatures, which will interfere with the endocrine system of the human body. SUMMARY

[0004] The purpose of the present application is to solve the problems in the prior art and provide a preparation method of environment-friendly PVC plate.

[0005] Technical scheme: A preparation method of environment-friendly PVC plate, characterized by the following steps during preparation: S1. Prepare the production raw materials. The production raw material formula includes the following components in mass parts: polyvinyl chloride resin 50-70 parts, calcium-zinc stabilizer 2-3 parts, dioctyl terephthalate DOTP 5-8 parts; heavy calcium carbonate 20-40 parts; flame retardant 6-8 parts, the flame retardant including antimony trioxide and chlorinated paraffin; S2. Subsection feeding and mixing, first mix the polyvinyl chloride resin and the calcium-zinc stabilizer, then add the heavy calcium carbonate, the dioctyl terephthalate, and the flame retardant in turn; S3. High-speed stirring of the mixed material to ensure that the polyvinyl chloride resin and the calcium-zinc stabilizer, the heavy calcium carbonate, the dioctyl terephthalate, and the flame retardant are fully melted; S4. Press the plate. The uniformly mixed raw materials are extruded into the press, and the mixed material is pressed into a PVC plate of a specified specification under high temperature and high pressure; S5. Cooling and shaping. The PVC plate coming out of the press is cooled, and the PVC plate is stable in shape during cooling; S6. Cutting, the PVC plate after cooling is cut according to the set size; S7. Trimming, the edge of the PVC plate is trimmed to make the edge of the PVC plate smooth; S8. Surface treatment, the surface of the PVC plate is cleaned.

[0006] The further improvement of the present application is that in the step S2, the mixing time of the polyvinyl chloride resin and the calcium-zinc stabilizer is 2 minutes.

[0007] The further improvement of the present application is that in the step S2, the total time of the segmented feeding and mixing is 9-15 minutes.

[0008] The further improvement of the present application is that in the step S3, the temperature of the high-speed stirring of the mixed material is 100-125 degrees Celsius.

[0009] The further improvement of the present application is that in the step S4, the temperature of the pressing plate is 160-180 degrees Celsius.

[0010] The further improvement of the present application is that in the step S6, the cut PVC plate is pasted with a PE protective film.

[0011] The further improvement of the present application is that in the step S8, the surface of the PVC plate is covered with a wear-resistant layer.

[0012] The further improvement of the present application is that the thickness of the wear-resistant layer is 0.1-0.5 mm.

[0013] Compared with the prior art, the preparation method of the environment-friendly PVC plate provided by the present application at least achieves the following beneficial effects: The calcium-zinc stabilizer added during the preparation of the present application has good dispersibility and fluidity in PVC processing, which improves the surface smoothness of the product; the dioctyl terephthalate added has the advantages of heat resistance, cold resistance, non-volatility, softness and good electrical insulation performance; the heavy calcium carbonate added has good affinity with PVC resin and high dispersity, which does not easily damage the surface smoothness of the product; the flame retardant added has good compatibility with PVC, and does not easily appear agglomeration phenomenon during processing, which ensures the stability of the comprehensive performance of the material, does not burn when encountering fire and has good flame retardant performance; the PVC plate of the present application does not involve harmful substances such as formaldehyde, volatile organic compounds and volatile plasticizers during production, and does not release toxic gases during use, which meets the environmental protection standard and ensures personal health and safety. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The flow chart of the preparation method of the environment-friendly PVC plate of the present application. DETAILED DESCRIPTION

[0015] Various exemplary embodiments of the present application will now be described in detail. It should be noted that the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments are not limiting of the scope of the present application unless specifically stated otherwise. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application or its application or uses.

[0016] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, the techniques, methods, and apparatus should be construed as being a part of this specification, where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative and not as a limitation. Other examples of the exemplary embodiments can therefore have different values.

[0017] Referring to Figure 1 A method for preparing an environmentally friendly PVC plate, characterized in that the preparation comprises the following steps: S1. Prepare the production raw materials, the production raw material formula comprises the following components by mass fraction: polyvinyl chloride resin 50-70 parts, calcium-zinc stabilizer 2-3 parts, dioctyl terephthalate DOTP 5-8 parts; heavy calcium carbonate 20-40 parts; flame retardant 6-8 parts, the flame retardant comprises antimony trioxide, chlorinated paraffin; S2. Subsection feeding and mixing, first mix polyvinyl chloride resin and calcium-zinc stabilizer, then add heavy calcium carbonate, dioctyl terephthalate, and flame retardant in turn; S3. High-speed stirring of the mixed material to ensure that the polyvinyl chloride resin and calcium-zinc stabilizer, heavy calcium carbonate, dioctyl terephthalate, and flame retardant are fully melted; S4. Press the plate, the uniformly mixed raw materials are extruded into the press, and the mixed material is pressed into a PVC plate of a specified specification under high temperature and high pressure; S5. Cooling and shaping, the PVC plate coming out of the press is cooled, and the PVC plate stabilizes its shape during cooling; S6. Cutting, the cooled PVC plate is cut according to the specified size; S7. Finishing, the edges of the PVC plate are trimmed to make the edges of the PVC plate smooth; S8. Surface treatment, the surface of the PVC plate is cleaned.

[0018] The mixing time of the polyvinyl chloride resin and the calcium-zinc stabilizer in step S2 is 2 minutes; the total mixing time of the stepwise feeding in step S2 is 9-15 minutes; the temperature during the high-speed stirring of the mixed material in step S3 is 100-125 DEG C; the temperature during the pressing of the plate in step S4 is 160-180 DEG C; the PE protective film is attached to the surface of the cut PVC plate in step S6, the PE protective film can effectively isolate dust, stains and scratches, prevent the PVC plate from being damaged during transportation, storage or installation, and has stable adhesion and holding stability, which can reduce surface pollution and scratches, and maintain the original gloss and texture of the PVC plate; the surface of the PVC plate is covered with a wear-resistant layer in step S8, the wear-resistant layer can withstand high-strength treading and friction, and prolong the service life of the PVC plate; the thickness of the wear-resistant layer is 0.1-0.5 mm.

[0019] The calcium-zinc stabilizer added during the preparation of the application has good dispersibility and fluidity in PVC processing, which improves the surface smoothness of the product; the dioctyl terephthalate added has the advantages of heat resistance, cold resistance, non-volatility, softness and good electrical insulation performance; the heavy calcium carbonate added has good affinity with PVC resin, high dispersity and is not easy to damage the smoothness of the product surface, the flame retardant added has good compatibility with PVC, and is not easy to appear agglomeration phenomenon during processing, which ensures the stability of the comprehensive performance of the material, does not burn when encountering fire and has good flame retardant performance; the PVC plate of the application does not involve harmful substances such as formaldehyde, volatile organic compounds and volatile plasticizers during production, and does not release toxic gases during use, which meets the environmental protection standard and ensures personal health and safety.

[0020] The specific embodiments described herein are merely illustrative of the present application. Those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A method for preparing an environmentally friendly PVC sheet, characterized in that: The preparation comprises the following steps: S1. Prepare the raw materials for production. The raw material formula includes the following components in parts by weight: 50 to 70 parts of polyvinyl chloride resin, 2 to 3 parts of calcium zinc stabilizer, 5 to 8 parts of dioctyl terephthalate (DOTP), 20 to 40 parts of heavy calcium carbonate, and 6 to 8 parts of flame retardant, wherein the flame retardant includes antimony trioxide and chlorinated paraffin. S2. Mix the materials in stages, first mixing the polyvinyl chloride resin and calcium zinc stabilizer, then adding heavy calcium carbonate, dioctyl terephthalate, and flame retardant in sequence; S3. Stir the mixture at high speed to ensure that the polyvinyl chloride resin, calcium zinc stabilizer, heavy calcium carbonate, dioctyl terephthalate, and flame retardant are fully melted; S4 pressed sheet, the mixed raw materials are extruded into the press, the mixture is pressed into a set specification PVC board under high temperature and high pressure; S5. Cooling and shaping: the PVC sheet coming out of the press is cooled, and the shape of the PVC sheet stabilizes during cooling; S6. Cutting: The cooled PVC sheet is cut according to the set size; S7. Trimming: trimming the edges of the PVC sheet to make the edges of the PVC sheet smooth; S8. Surface treatment: clean the surface of the PVC sheet.

2. The method for preparing an environmentally friendly PVC sheet according to claim 1, characterized in that: In step S2, the mixing time of the polyvinyl chloride resin and the calcium zinc stabilizer is 2 minutes.

3. The method for preparing an environmentally friendly PVC sheet according to claim 1, characterized in that: In step S2, the total time for mixing the materials in stages is 9 to 15 minutes.

4. The method for preparing an environmentally friendly PVC sheet according to claim 1, characterized in that: In step S3, the temperature of the mixture during high-speed stirring is 100 to 125 degrees Celsius.

5. The method for preparing an environmentally friendly PVC sheet according to claim 1, characterized in that: In step S4, the temperature during pressing of the plate is 160-180 degrees Celsius.

6. The method for preparing an environmentally friendly PVC sheet according to claim 1, characterized in that: In step S6, a PE protective film is affixed to the surface of the cut PVC sheet.

7. The method for preparing an environmentally friendly PVC sheet according to claim 1, characterized in that: In step S8, the surface of the PVC plate is covered with a wear-resistant layer.

8. The method for preparing an environmentally friendly PVC sheet according to claim 7, characterized in that: The thickness of the wear-resistant layer is 0.1 to 0.5 mm.

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