CN112644096A - High-temperature-resistant oleophobic PVC (polyvinyl chloride) material and pipe capable of being repeatedly processed and preparation method thereof - Google Patents

High-temperature-resistant oleophobic PVC (polyvinyl chloride) material and pipe capable of being repeatedly processed and preparation method thereof Download PDF

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Publication number
CN112644096A
CN112644096A CN202110047332.5A CN202110047332A CN112644096A CN 112644096 A CN112644096 A CN 112644096A CN 202110047332 A CN202110047332 A CN 202110047332A CN 112644096 A CN112644096 A CN 112644096A
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parts
pvc
oleophobic
talcum powder
temperature
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崔成华
邵逸杭
徐辛
钱功海
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Zhejiang Tongzheng Pipe Technology Co ltd
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Zhejiang Tongzheng Pipe Technology Co ltd
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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
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • 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
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08L27/06—Homopolymers or copolymers of vinyl chloride
    • 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
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/104—Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • 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
    • B32B2597/00—Tubular articles, e.g. hoses, pipes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/18—Applications used for pipes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The invention provides a high-temperature-resistant oleophobic PVC material capable of being repeatedly processed, a pipe and a preparation method thereof, and relates to the technical field of new materials and processing. Realize the even cladding of polytetrafluoroethylene emulsion to the talcum powder through high-speed mechanical mixing, then through high temperature treatment, the polytetrafluoroethylene emulsion solidification of even cladding on the talcum powder surface, utilize the characteristic that slice talcum powder formed orientation structure when extruding the machine-shaping, the talcum powder that makes cladding polytetrafluoroethylene layer is the lamellar distribution in oleophobic PVC material, and then the realization is extruded the abundant distribution on PVC material surface polytetrafluoroethylene layer, the material of preparing from this is after high temperature treatment, the surface still has good oleophobic nature, and this material is after breakage and machine-shaping once more, still keep better oleophobic characteristic, can repeat processing.

Description

High-temperature-resistant oleophobic PVC (polyvinyl chloride) material and pipe capable of being repeatedly processed and preparation method thereof
Technical Field
The invention relates to a new material and a processing method, in particular to a high-temperature-resistant oleophobic PVC material capable of being repeatedly processed, a pipe and a preparation method.
Background
Reducing the surface energy of the plastic and controlling the surface microstructure can effectively improve the oleophobic properties of the material. However, plastics such as PVC, PE, PP, ABS, etc. have difficulty in controlling the surface microstructure by conventional extrusion processing methods, and especially when these materials are processed into plastic pipes, the inner wall has more difficulty in controlling the surface microstructure. Moreover, the hardness of the plastic is relatively low, the microstructure on the surface of the plastic is easy to damage under the action of external force or under the condition of heating, and the service life is short. Therefore, for plastic pipe structures, reducing the surface energy of the plastic is the main method for improving the oleophobicity of the plastic. In addition, the polymer-based oleophobic material also needs to meet the repeatable processing characteristic, namely, the oleophobic material still meets certain oleophobic characteristic after being processed after being crushed, thereby facilitating the recycling of the material and reducing the environmental pollution.
At present, the oleophobic performance of a macromolecular base oleophobic material is realized by coating or by improving the surface structure of the material, and the oleophobic performance of PVC and other plastics is difficult to realize by a conventional extrusion processing method.
The present application was made based on this.
Disclosure of Invention
In order to solve the above-mentioned drawbacks of the prior art, a first object of the present invention is to provide a high temperature and oleophobic PVC material that can be repeatedly processed.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high-temperature-resistant oleophobic PVC material capable of being repeatedly processed comprises the following components in parts by weight: 100 parts of PVC, 10-100 parts of talcum powder, 5-50 parts of polytetrafluoroethylene emulsion, 3-5 parts of heat stabilizer, 1-2 parts of lubricant, 3-8 parts of flexibilizer and 0.5-2 parts of processing aid.
Preferably, the mesh number of the talcum powder is 1500-2000 meshes, and the proper particle size of the talcum powder can keep good mechanical properties of the material.
Preferably, the water content of the polytetrafluoroethylene emulsion is 40-45%.
The invention also provides a pipe made of the high-temperature-resistant and oleophobic PVC material capable of being repeatedly processed.
Preferably, the thickness of the inner layer is 0.1-0.5 mm, and the lower thickness of the inner layer is beneficial to reducing the production cost of the pipe.
Preferably, calcium carbonate or titanium dioxide is not added to the inner layer. Although calcium carbonate and titanium dioxide are inorganic materials commonly added to hard PVC, the particle surfaces of the calcium carbonate and the titanium dioxide are not smooth and have large specific surface area, and a large amount of polytetrafluoroethylene emulsion is easily adsorbed, so that the oleophobic performance of the material is greatly reduced, and therefore, the calcium carbonate and the titanium dioxide cannot be added to the oleophobic material.
Preferably, the outer layer comprises the following components in parts by weight: 100 parts of PVC, 4 parts of heat stabilizer, 3 parts of lubricant, 5 parts of flexibilizer and 15 parts of calcium carbonate.
The third purpose of the invention is to provide a method for manufacturing a pipe by using a high-temperature-resistant oleophobic PVC material capable of being repeatedly processed, which comprises the following steps:
(1) mixing talcum powder and polytetrafluoroethylene emulsion: mixing the talcum powder and the polytetrafluoroethylene emulsion at a high speed to uniformly coat the talcum powder by the polytetrafluoroethylene emulsion to obtain a mixed material of the talcum powder and the polytetrafluoroethylene emulsion;
(2) and (3) drying treatment: drying the mixed material of the talcum powder and the polytetrafluoroethylene emulsion obtained in the step (1) at the temperature of 110-150 ℃;
(3) high-temperature treatment: treating the mixed material of the talcum powder and the polytetrafluoroethylene emulsion obtained by drying in the step (2) at the temperature of 260 ℃ and 280 ℃ for 50-80 min to realize the solidification of the polytetrafluoroethylene emulsion on the surface of the sheet talcum powder;
(4) inner layer material mixing: adding PVC, a heat stabilizer, a lubricant, a flexibilizer and a processing aid into a high-speed mixer according to the proportion for high-speed mixing, heating to 110-120 ℃, then cooling to 50-60 ℃, discharging, and then uniformly stirring with the material obtained by the high-temperature treatment in the step (3) at a low speed;
(5) mixing outer layer materials: mixing PVC, a heat stabilizer, a lubricant, a flexibilizer and calcium carbonate at a high speed according to the proportion, heating to 110-120 ℃, cooling to 50-60 ℃, and discharging;
(6) extruding: double-layer extrusion molding is adopted, one extruder extrudes a PVC layer, and the other extruder extrudes an oleophobic PVC material layer.
The invention has the advantages of oleophobic principle and realized beneficial technical effect:
(1) the invention realizes the uniform coating of the polytetrafluoroethylene emulsion on the talcum powder by high-speed mechanical mixing.
(2) The invention solidifies the polytetrafluoroethylene emulsion uniformly coated on the surface of the talcum powder through high-temperature treatment, namely, a uniform polytetrafluoroethylene coating layer is formed on the surface of the talcum powder.
(3) The invention realizes the solidification treatment of the polytetrafluoroethylene emulsion by utilizing the high temperature resistance of the talcum powder inorganic material.
(4) The invention utilizes the characteristic that the sheet talcum powder forms an oriented structure during extrusion processing molding, so that the talcum powder coated with the polytetrafluoroethylene layer is distributed in a layered manner in the oleophobic PVC material, and further, the polytetrafluoroethylene layer on the surface of the extruded PVC material is fully distributed.
(5) The surface of the high-temperature-resistant oleophobic PVC material which can be repeatedly processed and is prepared by the invention still has good oleophobic property after high-temperature (80 ℃) treatment, which shows that the material can be used in high-temperature environment, and the material still keeps good oleophobic property after being crushed and processed and formed again.
(6) The raw materials required by the high-temperature-resistant oleophobic PVC material capable of being repeatedly processed are sold in the market, are easy to obtain, have simple preparation process and are easy to realize industrial continuous production.
In conclusion, the high-temperature-resistant oleophobic PVC material capable of being repeatedly processed and the pipe thereof prepared by the invention adopt the traditional extrusion molding mode, have simple and convenient method, are green and environment-friendly, can be processed and molded at one time, and are suitable for industrial production.
Detailed Description
In order to make the technical means of the present invention and the technical effects achieved by the technical means clearer and more complete, three specific examples and two comparative examples are provided:
example 1
The high-temperature-resistant oleophobic PVC pipe capable of being repeatedly processed comprises an inner layer and an outer layer: the inner layer is a high-temperature-resistant super-oleophobic PVC material capable of being repeatedly processed, and comprises the following components in parts by weight: 100 parts of PVC resin, 50 parts of talcum powder, 15 parts of polytetrafluoroethylene emulsion, 3 parts of heat stabilizer, 1 part of lubricant, 5 parts of flexibilizer and 0.5 part of processing aid; the outer layer is a PVC material layer and comprises the following components in parts by weight: 100 parts of PVC resin, 4 parts of heat stabilizer, 3 parts of lubricant, 5 parts of flexibilizer and 15 parts of calcium carbonate.
The water content of the polytetrafluoroethylene emulsion used was 40%.
The mesh number of the used talcum powder is 1500 meshes.
The thickness of the inner layer of the pipe is 0.1 mm.
The preparation method of the high-temperature-resistant oleophobic PVC material capable of being repeatedly processed and the pipe thereof comprises the following steps:
(1) mixing talcum powder and polytetrafluoroethylene emulsion: mixing talcum powder and polytetrafluoroethylene emulsion at high speed;
(2) and (3) drying treatment: drying the mixed materials in the step (1) at 110 ℃;
(3) high-temperature treatment: treating the dried material in the step (2) at a high temperature of 260 ℃ for 50 min to realize the solidification of the polytetrafluoroethylene emulsion on the surface of the flaky talcum powder;
(4) inner layer material mixing: adding PVC, a heat stabilizer, a lubricant, a toughening agent and a processing aid into a high-speed mixer according to a ratio for high-speed mixing, heating to 110 ℃, cooling to 50 ℃, and discharging; uniformly stirring the mixed material and the material in the step (3) at a low speed;
(5) mixing outer layer materials: mixing PVC, a heat stabilizer, a lubricant, a flexibilizer, calcium carbonate and other materials at a high speed according to the proportion, heating to 120 ℃, cooling to 50 ℃, and discharging;
(6) extruding: double-layer extrusion molding is adopted, one extruder extrudes a PVC layer, and the other extruder extrudes an oleophobic PVC material layer.
Example 2
This is the oily PVC material of high temperature resistant of a reworkable and tubular product thereof of embodiment, tubular product includes inlayer and skin: the inner layer is a high-temperature-resistant super-oleophobic PVC material capable of being repeatedly processed, and comprises the following components in parts by weight: 100 parts of PVC resin, 80 parts of talcum powder, 35 parts of polytetrafluoroethylene emulsion, 4 parts of heat stabilizer, 2 parts of lubricant and the like, 5 parts of flexibilizer and 1 part of processing aid; the outer layer is a PVC material layer and comprises the following components in parts by weight: 100 parts of PVC resin, 4 parts of heat stabilizer, 3 parts of lubricant, 5 parts of flexibilizer and 15 parts of calcium carbonate.
The water content of the polytetrafluoroethylene emulsion used was 40%.
The mesh number of the used talcum powder is 1500 meshes.
The thickness of the inner layer of the pipe is 0.3 mm.
The preparation method of the high-temperature-resistant oleophobic PVC material capable of being repeatedly processed and the pipe thereof comprises the following steps:
(1) mixing talcum powder and polytetrafluoroethylene emulsion: mixing talcum powder and polytetrafluoroethylene emulsion at high speed;
(2) and (3) drying treatment: drying the mixed materials in the step (1) at 120 ℃;
(3) high-temperature treatment: treating the dried material in the step (2) at a high temperature of 270 ℃ for 60 min to realize the solidification of the polytetrafluoroethylene emulsion on the surface of the flaky talcum powder;
(4) inner layer material mixing: adding PVC, a heat stabilizer, a lubricant, a toughening agent and a processing aid into a high-speed mixer according to a ratio for high-speed mixing, heating to 110 ℃, cooling to 55 ℃, and discharging; uniformly stirring the mixed material and the material in the step (3) at a low speed;
(5) mixing outer layer materials: mixing PVC, a heat stabilizer, a lubricant, a flexibilizer, calcium carbonate and other materials at a high speed according to the proportion, heating to 120 ℃, cooling to 55 ℃, and discharging;
(6) extruding: double-layer extrusion molding is adopted, one extruder extrudes a PVC layer, and the other extruder extrudes an oleophobic PVC material layer.
Example 3
The high-temperature-resistant oleophobic PVC pipe capable of being repeatedly processed comprises an inner layer and an outer layer: the inner layer is a high-temperature-resistant super-oleophobic PVC material capable of being repeatedly processed, and comprises the following components in parts by weight: 100 parts of PVC resin, 100 parts of talcum powder, 50 parts of polytetrafluoroethylene emulsion, 5 parts of heat stabilizer, 2 parts of lubricant, 8 parts of flexibilizer and 1.2 parts of processing aid; the outer layer is a PVC material layer and comprises the following components in parts by weight: 100 parts of PVC resin, 4 parts of heat stabilizer, 3 parts of lubricant, 5 parts of flexibilizer and 15 parts of calcium carbonate.
The water content of the polytetrafluoroethylene emulsion used was 40%.
The mesh number of the used talcum powder is 2000 meshes.
The thickness of the inner layer of the pipe is 0.4 mm.
The preparation method of the high-temperature-resistant oleophobic PVC material capable of being repeatedly processed and the pipe thereof comprises the following steps:
(1) mixing talcum powder and polytetrafluoroethylene emulsion: mixing talcum powder and polytetrafluoroethylene emulsion at high speed;
(2) and (3) drying treatment: drying the mixed material in the step (1) at 150 ℃;
(3) high-temperature treatment: treating the dried material in the step (2) at a high temperature of 280 ℃ for 80 min to realize the solidification of the polytetrafluoroethylene emulsion on the surface of the flaky talcum powder;
(4) inner layer material mixing: adding PVC, a heat stabilizer, a lubricant, a toughening agent and a processing aid into a high-speed mixer according to a ratio for high-speed mixing, heating to 120 ℃, cooling to 60 ℃, and discharging; uniformly stirring the mixed material and the material in the step (3) at a low speed;
(5) mixing outer layer materials: mixing PVC, a heat stabilizer, a lubricant, a flexibilizer, calcium carbonate and other materials at a high speed according to the proportion, heating to 120 ℃, cooling to 60 ℃, and discharging;
(6) extruding: double-layer extrusion molding is adopted, one extruder extrudes a PVC layer, and the other extruder extrudes an oleophobic PVC material layer.
Comparative example 1
The comparative example is a single-layer PVC pipe, which comprises the following components in parts by weight: 100 parts of PVC, 20 parts of calcium carbonate, 3.5 parts of heat stabilizer, 3 parts of toughener, 1.5 parts of lubricant and 1 part of processing aid.
The preparation method comprises the steps of material mixing and extrusion molding.
Comparative example 2
The comparative example is a double-layer PVC pipe, and the outer layer comprises the following components in parts by weight: 100 parts of PVC resin, 4 parts of heat stabilizer, 3 parts of lubricant, 5 parts of flexibilizer and 15 parts of calcium carbonate; the inner layer comprises the following components in parts by weight: 100 parts of PVC resin, 4 parts of heat stabilizer, 5 parts of flexibilizer, 50 parts of polytetrafluoroethylene powder and 3 parts of lubricant and other auxiliary agents.
The preparation method comprises material mixing and double-layer extrusion molding.
Table 1: results of oil contact angle tests of example 1, example 2, example 3, comparative example 1 and comparative example 2 (the test used oil was rapeseed oil).
Figure 370144DEST_PATH_IMAGE002
Through the examples 1, 2 and 3, the polytetrafluoroethylene emulsion is coated on the surface of the talcum powder through mechanical dispersion and high-temperature curing, and the surface energy of the material can be reduced and the oleophobic property of the PVC material can be improved when the polytetrafluoroethylene emulsion is added into the PVC material; and the material still keeps good oleophobic property after being crushed and processed and formed again, so the material can be processed repeatedly. Comparative example 2 shows that the oleophobic property of the PVC material is not obviously improved by only adding the polytetrafluoroethylene solid particles even if the adding amount is high. It is proved again that the structure that the polytetrafluoroethylene is coated on the surface of the layered talcum powder greatly improves the oleophobic property of the extruded PVC material.
The above description is provided for the purpose of further elaboration of the technical solutions provided in connection with the preferred embodiments of the present invention, and it should not be understood that the embodiments of the present invention are limited to the above description, and it should be understood that various simple deductions or substitutions can be made by those skilled in the art without departing from the spirit of the present invention, and all such alternatives are included in the scope of the present invention.

Claims (8)

1. The high-temperature-resistant oleophobic PVC material capable of being repeatedly processed is characterized by comprising the following components in parts by weight: 100 parts of PVC, 10-100 parts of talcum powder, 5-50 parts of polytetrafluoroethylene emulsion, 3-5 parts of heat stabilizer, 1-2 parts of lubricant, 3-8 parts of flexibilizer and 0.5-2 parts of processing aid.
2. The reworkable, high temperature resistant, oleophobic PVC pipe of claim 1, wherein: the mesh number of the talcum powder is 1500-2000 meshes.
3. The reworkable, high temperature resistant, oleophobic PVC pipe of claim 1, wherein: the water content of the polytetrafluoroethylene emulsion is 40-45%.
4. A pipe made of a reprocessable high temperature resistant oleophobic PVC material according to any one of claims 1-3, comprising an inner layer and an outer layer, the outer layer being a PVC layer and the inner layer being a reprocessable high temperature resistant oleophobic PVC material layer.
5. The tubing made of the reworkable, high temperature and oleophobic PVC material of claim 4, wherein: the thickness of the inner layer is 0.1-0.5 mm.
6. The tubing made of the reworkable, high temperature and oleophobic PVC material of claim 4, wherein: the inner layer is not added with calcium carbonate or titanium dioxide.
7. The tubing made of the reworkable, high temperature and oleophobic PVC material of claim 4, wherein: the outer layer comprises the following components in parts by weight: 100 parts of PVC, 4 parts of heat stabilizer, 3 parts of lubricant, 5 parts of flexibilizer and 15 parts of calcium carbonate.
8. A method for manufacturing a tube by using a high-temperature-resistant and oleophobic PVC material capable of being repeatedly processed comprises the following steps:
(1) mixing talcum powder and polytetrafluoroethylene emulsion: mixing the talcum powder and the polytetrafluoroethylene emulsion at a high speed to uniformly coat the talcum powder by the polytetrafluoroethylene emulsion to obtain a mixed material of the talcum powder and the polytetrafluoroethylene emulsion;
(2) and (3) drying treatment: drying the mixed material of the talcum powder and the polytetrafluoroethylene emulsion obtained in the step (1) at the temperature of 110-150 ℃;
(3) high-temperature treatment: treating the mixed material of the talcum powder and the polytetrafluoroethylene emulsion obtained by drying in the step (2) at the temperature of 260 ℃ and 280 ℃ for 50-80 min to realize the solidification of the polytetrafluoroethylene emulsion on the surface of the sheet talcum powder;
(4) inner layer material mixing: adding PVC, a heat stabilizer, a lubricant, a flexibilizer and a processing aid into a high-speed mixer according to the proportion for high-speed mixing, heating to 110-120 ℃, then cooling to 50-60 ℃, discharging, and then uniformly stirring with the material obtained by the high-temperature treatment in the step (3) at a low speed;
(5) mixing outer layer materials: mixing PVC, a heat stabilizer, a lubricant, a flexibilizer and calcium carbonate at a high speed according to the proportion, heating to 110-120 ℃, cooling to 50-60 ℃, and discharging;
(6) extruding: double-layer extrusion molding is adopted, one extruder extrudes a PVC layer, and the other extruder extrudes an oleophobic PVC material layer.
CN202110047332.5A 2021-01-14 2021-01-14 High-temperature-resistant oleophobic PVC (polyvinyl chloride) material and pipe capable of being repeatedly processed and preparation method thereof Pending CN112644096A (en)

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