PVC (polyvinyl chloride) pipe as well as preparation method and application thereof

Abstract

The invention discloses a PVC pipe and a preparation method and application thereof, and belongs to the technical field of plastic pipes, the PVC pipe comprises an inner layer and an outer layer, the inner layer comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin, 4-5 parts of a stabilizer, 5-8 parts of calcium carbonate, 0.6-1 part of a first lubricant, 0.2-0.6 part of a second lubricant, 0.28-0.5 part of glycerol monostearate, 15-35 parts of an auxiliary agent, 1-1.5 parts of a titanate coupling agent, and 0.2-0.5 part of carbon black. The PVC pipe has excellent wear resistance and thermal deformation resistance, when fluid passes through the inner layer, the pipe is not prone to damage and deformation, and the PVC pipe has wide application prospects.

Description

Technical Field

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

[0002] PVC pipes are widely used in water supply, building drainage, sewage disposal, chemical industry and other technical fields because of their low cost, easy processing, strong corrosion resistance, high strength and good rigidity.

[0003] However, most PVC pipes on the market have average wear resistance and low Vicat softening temperature. The transported fluid is easily worn and easily deformed at high temperatures. When used outdoors to transport liquids containing waste slag produced by power plants, calcium carbide plants, lead mines, and other industrial and mining enterprises, as well as to transport excrement liquids in animal husbandry, the pipes are easily damaged, brittle, and easily deformed, requiring manual maintenance, which is more troublesome.

[0004] In view of this, this application is filed. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a PVC pipe and a preparation method and application thereof, wherein the PVC pipe has excellent wear resistance and heat deformation resistance.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A PVC pipe comprises an inner layer and an outer layer, wherein the inner layer comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin, 4 to 5 parts of a stabilizer, 5 to 8 parts of calcium carbonate, 0.6 to 1 part of a first lubricant, 0.2 to 0.6 parts of a second lubricant, 0.28 to 0.5 parts of glyceryl monostearate, 15 to 35 parts of an auxiliary agent, 1 to 1.5 parts of a titanate coupling agent, and 0.2 to 0.5 parts of carbon black.

[0008] The present invention creatively combines the above-mentioned raw materials to obtain a PVC pipe with excellent wear resistance and heat deformation resistance. When the fluid passes through the inner layer, the pipe is not easy to be damaged or deformed.

[0009] As a preferred embodiment of the present invention, the outer layer includes the following components in parts by weight: 100 parts of polyvinyl chloride resin, 4 to 5 parts of stabilizer, 5 to 8 parts of calcium carbonate, 8 to 10 parts of titanium dioxide, 0.5 to 1 part of a first lubricant, 0.3 to 0.8 parts of a second lubricant, 0.2 to 0.6 parts of monostearate glycerol, 1 to 1.5 parts of a titanate coupling agent, 15 to 35 parts of an auxiliary agent, 0 to 12 parts of ABS resin, 0.8 to 1 parts of a compatibilizer, and 0.5 to 1 parts of carbon black.

[0010] The pipe of the present invention has good compatibility between the inner layer and the outer layer, and has adhesion between the inner layer and the outer layer, and does not require an intermediate adhesive layer, thereby obtaining a PVC pipe with excellent wear resistance and excellent heat deformation resistance of the inner and outer layers.

[0011] As a preferred embodiment of the present invention, the auxiliary agent includes the following components in parts by weight: 20 to 55 parts of silicon dioxide, 40 to 75 parts of polymethyl methacrylate, 2 to 2.5 parts of ethylene bisstearamide, 1 to 1.5 parts of zinc stearate, 1 to 1.5 parts of calcium stearate, and 0.2 to 0.5 parts of titanate coupling agent.

[0012] The present invention significantly improves the wear resistance and heat deformation resistance of the pipe by adding the additives containing silicon dioxide, polymethyl methacrylate, ethylene bisstearamide, zinc stearate, calcium stearate, and titanate coupling agent, reduces the risk of wear on the inner wall of the pipe when transporting liquids such as waste slag and excrement, and increases the service life of the pipe.

[0013] The inventors of the present invention have found that the amount and composition of the additive have a significant effect on the heat deformation resistance and wear resistance of the pipe. By controlling the amount within the scope of the present invention, the wear resistance and heat deformation resistance are significantly improved. When the amount of the additive deviates from the scope of the present invention, the wear resistance and heat deformation resistance will be significantly reduced. At the same time, the inventors of the present invention have found that the silica and the PMMA are both indispensable. The present invention uses silica and the PMMA in combination, and under the joint action of the two, the wear resistance and heat deformation resistance are synergistically improved.

[0014] As a preferred embodiment of the present invention, the auxiliary agent includes the following components in parts by weight: 30 to 45 parts of silicon dioxide, 50 to 65 parts of polymethyl methacrylate, 2 to 2.5 parts of ethylene bisstearamide, 1 to 1.5 parts of zinc stearate, 1 to 1.5 parts of calcium stearate, and 0.2 to 0.5 parts of titanate coupling agent.

[0015] As a preferred embodiment of the present invention, the melt flow rate of the polymethyl methacrylate at 230°C / 3.8kg is 2.3-3.7g / 10min; and / or

[0016] The particle size of the silicon dioxide is 2000-4000 meshes.

[0017] The inventors of the present invention have found that the use of PMMA with a melt flow rate of 2.3 to 3.7 g / 10 min and silica with a mesh size of 2000 to 4000 can significantly improve the wear resistance and heat deformation resistance.

[0018] As a preferred embodiment of the present invention, the melting point of the first lubricant is 108-112°C, and the melting point of the second lubricant is 92-98°C.

[0019] As a preferred embodiment of the present invention, the first lubricant is PE wax, and the second lubricant is Fischer-Tropsch wax.

[0020] As a preferred embodiment of the present invention, the melt flow rate of the ABS resin at 200° C. / 10 kg is 16 to 26 g / 10 min.

[0021] As a preferred embodiment of the present invention, the compatibilizer is maleic anhydride grafted ABS.

[0022] As a preferred embodiment of the present invention, the stabilizer is a zinc-calcium stabilizer.

[0023] As a preferred embodiment of the present invention, the thickness ratio of the inner layer and the outer layer is (0.6-0.75): (0.25-0.4); the composite tube D75*4mm: comprises an inner layer and an outer layer; the inner layer thickness is 2-3mm, and the outer layer wall thickness is 1-2mm.

[0024] The present invention also provides a method for preparing a PVC pipe, comprising the following steps:

[0025] The components of the inner layer tube are mixed and stirred to obtain an inner layer mixed material; the components of the outer layer tube are mixed and stirred to obtain an outer layer mixed material;

[0026] After the inner layer mixed materials and the outer layer mixed materials are loaded into the co-extrusion equipment, the co-extrusion is carried out, and the extruded materials are placed in a forming mold for forming, and the PVC pipe is obtained after shaping, cooling, pulling and cutting.

[0027] The invention also provides an application of a PVC pipe in preparing a drainage pipe.

[0028] The beneficial effects of the present invention are: (1) the PVC pipe described in the present invention has excellent wear resistance and heat deformation resistance. When the fluid passes through the inner layer, the pipe is not easy to be damaged or deformed, and has broad application prospects; (2) the present invention significantly improves the wear resistance and heat deformation resistance of the pipe by adding the additives containing silica, polymethyl methacrylate, ethylene bisstearamide, zinc stearate, calcium stearate, and titanate coupling agent, reduces the risk of wear on the inner wall of the pipe when transporting liquids such as waste slag and excrement, and increases the service life of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of the PVC pipe of the present invention.

[0030] Markings in the figure: 1, outer layer; 2, inner layer. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0032] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0033] 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 at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In this application, when it comes to numerical ranges, unless otherwise specified, the above numerical ranges are deemed to be continuous and include the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0035] The raw materials used in the embodiments and comparative examples are described as follows:

[0036] Polyvinyl chloride resin: Xinjiang Zhongtai, brand PVCsg5.

[0037] Stabilizer: Zinc-calcium stabilizer, Guangdong Xinda, brand QY-20318D.

[0038] First lubricant: PE wax, melting point 110°C, Qingdao Bangni, BN110 brand.

[0039] Second lubricant: Fischer-Tropsch wax, melting point 95°C, Shanxi Lu'an, LA-W95 brand.

[0040] Glyceryl Monostearate: Hangzhou Oil and Fat Chemical Industry.

[0041] Titanate coupling agent: isopropyl tri(dioctylphosphoyl) titanate, Jinan Rongzheng Chemical, brand KR-12.

[0042] Carbon black: Cabot, brand 250R.

[0043] Calcium carbonate: 1250 mesh, Jiangxi Guangyuan.

[0044] Titanium dioxide: Nanjing titanium dioxide, brand R950.

[0045] Compatibilizer: Maleic anhydride grafted ABS, Shenyang Ketong, KT-2.

[0046] PMMA-1: melt flow rate at 230°C / 3.8kg is 3.7 g / 10 min (Arkema, brand V825).

[0047] PMMA-2: melt flow rate at 230°C / 3.8kg is 2.3 g / 10 min (Arkema, brand V405).

[0048] PMMA-3: melt flow rate at 230°C / 3.8kg is 1.6 g / 10 min (Arkema, brand V826).

[0049] PMMA-4: melt flow rate at 230°C / 3.8kg is 8 g / 10 min (Arkema, brand V920).

[0050] Silica: 3000 mesh, DeLan Chemical.

[0051] Ethylene bisstearamide: Kao Corporation, brand EB-FF.

[0052] Zinc stearate: Zhongshan Huamingtai.

[0053] Calcium stearate: Zhongshan Huamingtai.

[0054] ABS-1: melt flow rate at 200℃ / 10kg is 20g / 10min, Jilin Petrochemical, brand 0215A.

[0055] ABS-2: melt flow rate at 200℃ / 10kg is 16g / 10min, Jilin Petrochemical, brand 9715A.

[0056] ABS-3: melt flow rate at 200℃ / 10kg is 26g / 10min, Jilin Petrochemical, brand 9815A.

[0057] ABS-4: melt flow rate at 200℃ / 10kg is 9g / 10min, Jilin Petrochemical, brand 9710A.

[0058] ABS-5: melt flow rate at 200℃ / 10kg is 35g / 10min, Jilin Petrochemical, brand 0215F.

[0059] Unless otherwise specified, the components and raw materials used in the embodiments and comparative examples of the present invention are all commercially available raw materials, and the components and raw materials used in each parallel experiment are all of the same kind.

[0060] Additives 1~10

[0061] The proportions of the additives 1 to 10 are shown in Table 1 (all parts in Table 1 are by weight).

[0062] The preparation methods of the additives 1 to 10 all include the following steps: adding the raw materials according to the proportion into a low-speed mixer and stirring at 200 rpm / min for 20 minutes to obtain the additives.

[0063] Table 1

[0064]

[0065] Examples 1 to 10, Comparative Examples 1 to 4

[0066] Examples 1 to 10 and Comparative Examples 1 to 4 investigate the effect of the inner layer formulation on the performance. The formulations of Examples 1 to 10 and Comparative Examples 1 to 4 are shown in Table 2 (all parts by weight in the table).

[0067] The inner layer preparation methods of Examples 1 to 10 and Comparative Examples 1 to 4 are as follows:

[0068] The components of the inner layer tube are mixed and stirred to obtain an inner layer mixed material; the inner layer mixed material is extruded and formed to obtain an inner layer.

[0069] Table 2

[0070]

[0071]

[0072] Performance Tests of Examples 1 to 10 and Comparative Examples 1 to 4

[0073] Wear resistance: Jiangsu Mingzhu MZ-4602 wear tester was used to make 9 kinds of flat samples (100×100×2mm samples), and the wear tester was used to test them for 15 minutes respectively.

[0074] Vicat softening temperature test method: GB / T8802-2001.

[0075] Table 3

[0076] Wear amount (g) Vicat softening temperature(℃) Example 1 1.2314 84.2 Example 2 1.0188 86.6 Example 3 1.2112 87.5 Example 4 1.2114 86.7 Example 5 1.1117 86.2 Example 6 1.1126 86.5 Example 7 1.2239 85.8 Example 8 1.1112 85.9 Example 9 1.2001 88.5 Example 10 1.2201 83.2 Comparative Example 1 1.3111 88.9 Comparative Example 2 1.3221 88.1 Comparative Example 3 1.7564 81.4 Comparative Example 4 1.3455 88.3

[0077] It can be seen from Table 3 that as the amount of wear-resistant agent increases, the Vicat softening point of the material increases slightly, and the wear amount decreases slightly.

[0078] Examples 11 to 17

[0079] Examples 11 to 17 investigate the effect of the outer layer formulation on the performance. The formulations of Examples 11 to 17 are shown in Table 4 (all parts by weight in the table).

[0080] The outer layer preparation method of Examples 11 to 17 is:

[0081] The components of the outer layer tube are mixed and stirred to obtain the inner layer mixed material; the outer layer mixed material is extruded and formed to obtain the outer layer.

[0082] Table 4

[0083]

[0084] Wear resistance: Jiangsu Mingzhu MZ-4602 wear tester was used to make 9 kinds of flat samples (100×100×2mm samples), and the wear tester was used to test them for 15 minutes respectively.

[0085] Vicat softening temperature:

[0086] Table 5

[0087]

[0088]

[0089] It can be seen from Table 5 that the formulation of the outer layer of the present invention has excellent wear resistance and excellent heat deformation resistance.

[0090] Embodiment 18

[0091] like Figure 1 As shown, Example 2 is used as the inner layer formula, Example 13 is used as the outer layer formula, according to the thickness ratio of 0.7:0.3, the total thickness is 4 mm, the inner layer mixed materials and the outer layer mixed materials are loaded into the co-extrusion equipment, co-extruded, and the extruded material is placed in a molding die for molding, and after shaping, cooling, pulling and cutting, a PVC pipe is obtained.

[0092] Wear resistance: Jiangsu Mingzhu MZ-4602 wear tester was used to make 9 kinds of flat samples (100×100×2mm samples). The wear tester was tested for 15 minutes respectively, and three groups were tested.

[0093] Vicat softening temperature: GB / T8802-2001.

[0094] Tensile strength: GB / T8804.2-2003.

[0095] Elongation at break: GB / T8804.1-2003.

[0096] Longitudinal shrinkage rate: GB / T6671-2001.

[0097] Table 6

[0098]

[0099] It can be seen that the PVC pipe of the present invention has excellent wear resistance, heat deformation resistance and mechanical properties, and has broad application prospects.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A PVC pipe, characterized in that: The invention comprises an inner layer and an outer layer, wherein the inner layer comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin, 4 to 5 parts of stabilizer, 5 to 8 parts of calcium carbonate, 0.6 to 1 part of a first lubricant, 0.2 to 0.6 parts of a second lubricant, 0.28 to 0.5 parts of glyceryl monostearate, 15 to 35 parts of an auxiliary agent, 1 to 1.5 parts of a titanate coupling agent, and 0.2 to 0.5 parts of carbon black.

2. The PVC pipe according to claim 1, characterized in that: The outer layer includes the following components in parts by weight: 100 parts of polyvinyl chloride resin, 4 to 5 parts of stabilizer, 5 to 8 parts of calcium carbonate, 8 to 10 parts of titanium dioxide, 0.5 to 1 part of a first lubricant, 0.3 to 0.8 parts of a second lubricant, 0.2 to 0.6 parts of monostearate glycerol, 1 to 1.5 parts of a titanate coupling agent, 15 to 35 parts of an auxiliary agent, 0 to 12 parts of ABS resin, 0.8 to 1 part of a compatibilizer, and 0.5 to 1 part of carbon black.

3. The PVC pipe according to any one of claims 1 to 2, characterized in that: The auxiliary agent comprises the following components in parts by weight: 20 to 55 parts of silicon dioxide, 40 to 75 parts of polymethyl methacrylate, 2 to 2.5 parts of ethylene bisstearamide, 1 to 1.5 parts of zinc stearate, 1 to 1.5 parts of calcium stearate, and 0.2 to 0.5 parts of titanate coupling agent.

4. The PVC pipe according to claim 3, characterized in that: The auxiliary agent comprises the following components in parts by weight: 30 to 45 parts of silicon dioxide, 50 to 65 parts of polymethyl methacrylate, 2 to 2.5 parts of ethylene bisstearamide, 1 to 1.5 parts of zinc stearate, 1 to 1.5 parts of calcium stearate, and 0.2 to 0.5 parts of titanate coupling agent.

5. The PVC pipe according to claim 3, characterized in that: The melt flow rate of the polymethyl methacrylate at 230° C. / 3.8 kg is 2.3 to 3.7 g / 10 min; and / or The particle size of the silicon dioxide is 2000-4000 meshes.

6. The PVC pipe according to claim 1, characterized in that: The melting point of the first lubricant is 108-112°C, and the melting point of the second lubricant is 92-98°C.

7. The PVC pipe according to claim 1, characterized in that: The melt flow rate of the ABS resin at 200°C / 10kg is 16-26g / 10min.

8. The PVC pipe according to claim 1, characterized in that: The compatibilizer is maleic anhydride grafted ABS.

9. The method for preparing a PVC pipe according to any one of claims 1 to 8, characterized in that: The following steps are involved: The components of the inner layer tube are mixed and stirred to obtain an inner layer mixed material; the components of the outer layer tube are mixed and stirred to obtain an outer layer mixed material; After the inner layer mixed materials and the outer layer mixed materials are loaded into the co-extrusion equipment, the co-extrusion is carried out, and the extruded materials are placed in a forming mold for forming, and the PVC pipe is obtained after shaping, cooling, pulling and cutting.

10. Use of the PVC pipe according to any one of claims 1 to 8 in the preparation of drainage pipes.

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