PVC (polyvinyl chloride) pipe and preparation method thereof

Abstract

The invention provides a PVC (Polyvinyl Chloride) pipe and a preparation method thereof. The PVC pipe is prepared from the following raw materials in parts by weight: 100 parts of PVC resin, 1.6 to 4.8 parts of metal stearate, 10.0 to 14.0 parts of nitrile rubber, 0.8 to 1.4 parts of anti-aging agent ABS (Acrylonitrile Butadiene Styrene), 6 to 10 parts of flame retardant, 2.1 to 3.2 parts of lubricant, 9.0 to 9.5 parts of calcium carbonate, 4.0 to 5.0 parts of processing agent ACR, 2.2 to 3.2 parts of EVA (Ethylene-Vinyl Acetate), 0.6 to 0.9 part of plasticizer, 4.0 to 5.0 parts of color master batch, 1.0 to 5.0 parts of silicon rubber and 5.0 to 15.0 parts of heat-resistant filler. By adding the metal stearate into the raw materials, the thermal stability of the PVC pipe can be improved, the thermal degradation process can be delayed, by adding the flame retardant, the flame retardant property of the PVC pipe can be improved, and the flammability in a high-temperature environment can be reduced; by adding the silicone rubber, the heat resistance of the PVC pipe can be improved, and the cold resistance of the PVC pipe can be improved; and by adding the heat-resistant filler, the strength and heat resistance of the PVC pipe can be improved.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of PVC pipes, and in particular to a PVC pipe and a preparation method thereof. Background Art

[0002] Polyvinyl chloride (PVC) has the characteristics of light weight, heat insulation, thermal insulation, moisture resistance, flame retardancy, and simple construction. It has a variety of specifications, colors, and patterns, and is highly decorative. It is widely used in production and life. It has good flame retardancy, wear resistance, chemical corrosion resistance, and low gas and water vapor leakage. In addition, it has good comprehensive mechanical properties, product transparency, electrical insulation, heat insulation, sound absorption, and shock absorption. It is a general-purpose material with the best performance-price ratio. Therefore, it is widely used in industrial pipes. With the continuous development of social economy, the requirements for the quality of polyvinyl chloride pipes are getting higher and higher. However, polyvinyl chloride has poor stability to light and heat, with a softening point of 80°C and begins to decompose at 130°C. Without heating the stabilizer, polyvinyl chloride begins to decompose at 100°C, and decomposes faster above 130°C. Summary of the invention

[0003] 1. Technical problem to be solved by the invention

[0004] The present invention provides a PVC pipe and a preparation method thereof, which are used to solve the technical problems existing in the above-mentioned background technology.

[0005] 2. Technical solution

[0006] To achieve the above purpose, the technical solution provided by the present invention is: a PVC pipe, characterized in that: its raw materials include, by weight: PVC resin: 100 parts, metal stearate: 1.6-4.8 parts, nitrile rubber: 10.0-14.0 parts, anti-aging agent ABS: 0.8-1.4 parts, flame retardant: 6-10 parts, lubricant: 2.1-3.2 parts, calcium carbonate: 9.0-9.5 parts, processing aid ACR: 4.0-5.0 parts, EVA: 2.2-3.2 parts, plasticizer: 0.6-0.9 parts, masterbatch: 4.0-5.0 parts, silicone rubber: 1.0-5.0 parts, heat-resistant filler: 5.0-15.0 parts.

[0007] Preferably, the raw materials include, by weight: 100 parts of PVC resin, 1.8 to 4.5 parts of metal stearate, 12.0 to 13.0 parts of nitrile rubber, 1.0 to 1.2 parts of anti-aging agent, 8 to 9 parts of flame retardant, 2.5 to 3.0 parts of lubricant, 9.2 to 9.4 parts of calcium carbonate, 4.3 to 4.8 parts of processing aid ACR, 2.5 to 3.0 parts of EVA, 0.7 to 0.8 parts of plasticizer, 4.2 to 4.8 parts of masterbatch, 2.0 to 4.0 parts of silicone rubber, and 8.0 to 13.0 parts of heat-resistant filler.

[0008] Preferably, the flame retardant is magnesium oxide, aluminum oxide or aluminum hydroxide, and the heat-resistant filler is glass fiber or inorganic fiber.

[0009] A method for preparing a PVC pipe comprises the following steps:

[0010] S1: Take the materials, accurately weigh and mix the required raw materials according to the formula requirements;

[0011] S2: Mixing: putting PVC resin, metal stearate, nitrile rubber, anti-aging agent, flame retardant, lubricant, calcium carbonate, processing aid ACR, EVA, plasticizer and masterbatch into a mixer, heating and mixing thoroughly;

[0012] S3: Extrusion, feeding the PVC melt mixed in step S2 into the extruder, adding silicone rubber and heat-resistant filler, and extruding the PVC melt into the barrel of the plasticizing screw through the rotation of the screw to melt it and form a uniform tube;

[0013] S4: Cooling: cooling the extruded molten PVC pipe through a cooling water tank to make it solidify and cool quickly to keep the shape and size stable;

[0014] S5: Cutting and packaging: cutting and packaging the cooled PVC pipes to achieve the final product shape and size.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0017] The present invention can improve the thermal stability of PVC pipes and delay the thermal degradation process by adding metal stearate to the raw materials; the flame retardant performance of PVC pipes can be improved by adding flame retardants and the flammability in high temperature environments can be reduced; the heat resistance of PVC pipes can be improved by adding silicone rubber, and the cold resistance can be improved; the strength and heat resistance of PVC pipes can be increased by adding heat-resistant fillers. DETAILED DESCRIPTION

[0018] To facilitate understanding of the present invention, the present invention will be described in more detail below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", "provided with", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] It should be noted that the structures not introduced in the present invention are the same as the prior art or can be implemented by using the prior art, and are not described in detail here because they do not involve the design points and improvement directions of the present invention.

[0023] Example 1

[0024] PVC resin: 100 parts, metal stearate: 1.6 parts, nitrile rubber: 14.0 parts, anti-aging agent ABS: 1.4 parts, flame retardant: 6 parts, lubricant: 2.1 parts, calcium carbonate: 9.5 parts, processing aid ACR: 4.0 parts, EVA: 3.2 parts, plasticizer: 0.9 parts, masterbatch: 4.0 parts, silicone rubber: 5.0 parts, heat-resistant filler: 5.0 parts. The flame retardant is magnesium oxide, and the heat-resistant filler is glass fiber.

[0025] Example 2

[0026] PVC resin: 100 parts, metal stearate: 4.8 parts, nitrile rubber: 10.0 parts, anti-aging agent ABS: 0.8 parts, flame retardant: 10 parts, lubricant: 3.2 parts, calcium carbonate: 9.0 parts, processing aid ACR: 5.0 parts, EVA: 2.2 parts, plasticizer: 0.6 parts, masterbatch: 5.0 parts, silicone rubber: 1.0 parts, heat-resistant filler: 15.0 parts. Flame retardant is aluminum oxide, and heat-resistant filler is inorganic fiber.

[0027] Example 3

[0028] PVC resin: 100 parts, metal stearate: 1.8 parts, nitrile rubber: 13.0 parts, anti-aging agent: 1.2 parts, flame retardant: 9 parts, lubricant: 2.5 parts, calcium carbonate: 9.4 parts, processing aid ACR: 4.3 parts, EVA: 2.5 parts, plasticizer: 0.7 parts, masterbatch: 4.2 parts, silicone rubber: 2.0 parts, heat-resistant filler: 13.0 parts. The flame retardant is aluminum hydroxide, and the heat-resistant filler is glass fiber.

[0029] Example 4

[0030] PVC resin: 100 parts, metal stearate: 4.5 parts, nitrile rubber: 12.0 parts, anti-aging agent: 1.0 parts, flame retardant: 8 parts, lubricant: 3.0 parts, calcium carbonate: 9.2 parts, processing aid ACR: 4.8 parts, EVA: 3.0 parts, plasticizer: 0.8 parts, masterbatch: 4.8 parts, silicone rubber: 4.0 parts, heat-resistant filler: 8.0 parts. Flame retardant is aluminum oxide, and heat-resistant filler is glass fiber.

[0031] A method for preparing a PVC pipe comprises the following steps:

[0032] S1: taking materials, accurately weighing and mixing the required raw materials according to the requirements of the raw material ratios in the above four embodiments;

[0033] S2: Mixing: putting PVC resin, metal stearate, nitrile rubber, anti-aging agent, flame retardant, lubricant, calcium carbonate, processing aid ACR, EVA, plasticizer and masterbatch into a mixer, heating and mixing thoroughly;

[0034] S3: Extrusion, feeding the PVC melt mixed in step S2 into the extruder, adding silicone rubber and heat-resistant filler, and extruding the PVC melt into the barrel of the plasticizing screw through the rotation of the screw to melt it and form a uniform tube;

[0035] S4: Cooling: cooling the extruded molten PVC pipe through a cooling water tank to make it solidify and cool quickly to keep the shape and size stable;

[0036] S5: Cutting and packaging: cutting and packaging the cooled PVC pipes to achieve the final product shape and size.

[0037] The samples obtained in the above examples 1 to 4 were subjected to relevant performance tests, and the test process was as follows:

[0038] Sampling: According to the relevant standard (ISO 306), the finished PVC pipes in the above four embodiments are sampled to prepare PVC pipes that meet the specified size.

[0039] Heating device setting: Preheat the heating device of the VICAT tester to the test temperature. According to the required temperature, adjust the control system of the test equipment.

[0040] Place the sample: Place the PVC sample in the test position of the heating device, ensuring that the sample is in full contact with the thermometer and loader. The sample should be located between the load rod and the heated baffle.

[0041] Apply load: Apply a predetermined load to the specimen. According to the standard, a common load is 10 Newtons (N). The load should be applied before the specimen reaches the test temperature.

[0042] Heating: Start heating the device and increase the temperature at a certain heating rate. Usually, the heating rate is 50℃ / h or 120℃ / h.

[0043] Observe deformation: Observe the deformation of the sample during heating. When the sample begins to soften and deform, the observed deformation is regarded as the heat deformation temperature of PVC.

[0044] Record results: Record the temperature at which the sample begins to soften and deform. Depending on the sample, you can record the initial softening temperature and the initial deformation temperature separately.

[0045] The test results are as follows:

[0046] VICAT softening temperature(℃) Example 1 Example 2 Example 3 Example 4 Test 1 100.5 105.6 103.6 108.6 Test 2 101.3 104.9 104.0 110.1 Test 3 101.1 105.1 103.8 109.5

[0047] The above-described embodiments only express a certain implementation mode of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A PVC pipe, characterized in that: The raw materials include, by weight: 100 parts of PVC resin, 1.6-4.8 parts of metal stearate, 10.0-14.0 parts of nitrile rubber, 0.8-1.4 parts of anti-aging agent ABS, 6-10 parts of flame retardant, 2.1-3.2 parts of lubricant, 9.0-9.5 parts of calcium carbonate, 4.0-5.0 parts of processing aid ACR, 2.2-3.2 parts of EVA, 0.6-0.9 parts of plasticizer, 4.0-5.0 parts of masterbatch, 1.0-5.0 parts of silicone rubber and 5.0-15.0 parts of heat-resistant filler.

2. A PVC pipe according to claim 1, characterized in that: The raw materials include, by weight: 100 parts of PVC resin, 1.8-4.5 parts of metal stearate, 12.0-13.0 parts of nitrile rubber, 1.0-1.2 parts of anti-aging agent, 8-9 parts of flame retardant, 2.5-3.0 parts of lubricant, 9.2-9.4 parts of calcium carbonate, 4.3-4.8 parts of processing aid ACR, 2.5-3.0 parts of EVA, 0.7-0.8 parts of plasticizer, 4.2-4.8 parts of masterbatch, 2.0-4.0 parts of silicone rubber and 8.0-13.0 parts of heat-resistant filler.

3. A PVC pipe according to claim 1 or 2, characterized in that: The flame retardant is magnesium oxide, aluminum oxide or aluminum hydroxide, and the heat-resistant filler is glass fiber or inorganic fiber.

4. A method for preparing a PVC pipe, characterized in that: The steps include: S1: Take the materials, accurately weigh and mix the required raw materials according to the formula requirements; S2: Mixing: putting PVC resin, metal stearate, nitrile rubber, anti-aging agent, flame retardant, lubricant, calcium carbonate, processing aid ACR, EVA, plasticizer and masterbatch into a mixer, heating and mixing thoroughly; S3: Extrusion, feeding the PVC melt mixed in step S2 into the extruder, adding silicone rubber and heat-resistant filler, and extruding the PVC melt into the barrel of the plasticizing screw through the rotation of the screw to melt it and form a uniform tube; S4: Cooling: cooling the extruded molten PVC pipe through a cooling water tank to make it solidify and cool quickly to keep the shape and size stable; S5: Cutting and packaging: cutting and packaging the cooled PVC pipes to achieve the final product shape and size.