Glass fiber reinforced polypropylene building mute drain pipe and preparation method thereof

Abstract

The invention discloses a glass fiber reinforced polypropylene building mute drain pipe and a preparation method thereof, and relates to the technical field of pipeline manufacturing. The invention discloses a preparation method of a glass fiber reinforced polypropylene building mute drain pipe, which comprises the following steps: uniformly mixing polypropylene, modified glass fiber and an auxiliary agent according to a raw material ratio to obtain a premix; extruding and granulating the premix through a double-screw blending extruder to obtain master batches; and carrying out injection molding on the master batch, cooling and shaping to obtain the glass fiber reinforced polypropylene mute drain pipe. The prepared modified glass fiber is added into pipeline raw materials, and the prepared drainage pipe has the advantages of being resistant to medium corrosion, good in aging resistance and excellent in mechanical property.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline manufacturing, and in particular to a glass fiber reinforced polypropylene building silent drainage pipe and a preparation method thereof. Background Art

[0002] As one of the five general-purpose plastics, polypropylene has the characteristics of low specific gravity, high tensile yield strength, bending modulus and hardness, and good resistance to environmental stress cracking. In addition, the raw material source is abundant and the price is low, which makes it very suitable for the preparation of injection-molded plastic products. It has a wide range of uses in the fields of household appliances, building materials, automobile manufacturing, agricultural production, etc. However, polypropylene has obvious defects, such as high notch sensitivity and low notch impact strength, which makes it difficult to be used as a high-impact material for highway drainage pipes.

[0003] In order to meet the application of polypropylene materials in the field of impact resistance, the common method is to use rubber or thermoplastic elastomer to toughen polypropylene to improve the impact resistance of polypropylene. Currently, the most commonly used materials include ethylene propylene diene monomer rubber (EPDM), silicone rubber (SR), styrene butadiene rubber (SBR), etc. However, since the drainage pipe is in a humid environment for a long time, it is easy to be corroded and damaged. Therefore, it is very necessary to take anti-corrosion measures for the drainage pipe. Summary of the invention

[0004] The purpose of the present invention is to provide a glass fiber reinforced polypropylene building silent drainage pipe and a preparation method thereof, so as to solve the following technical problems: The existing drainage pipes are in a humid environment for a long time and are easily damaged by corrosion.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A method for preparing a glass fiber reinforced polypropylene building silent drainage pipe comprises the following steps: S1: According to the raw material ratio, polypropylene, modified glass fiber and additives are mixed to obtain a premix; S2: Extruding and granulating the premixed material through a twin-screw blending extruder to obtain a masterbatch; S3: injecting and cooling the masterbatch to obtain a glass fiber reinforced polypropylene silent drainage pipe; The preparation method of modified glass fiber comprises the following steps: A1: Add γ-aminopropyltriethoxysilane, succinic anhydride and N,N-dimethylformamide into a reactor and disperse them evenly. Blend glass fiber and deionized water and add them into the reactor. Control the temperature at 50-60°C, keep the reaction warm for 3-6 hours, centrifuge, wash and dry to obtain carboxylated glass fiber. A2: Add carboxylated glass fiber and distilled water into a reaction kettle and disperse them evenly, add potassium persulfate and dimethyldiallylammonium chloride, control the temperature at 50-60°C, keep the reaction for 1-3 hours, filter, wash and dry to obtain component 1; A3: Add component 1, p-hydroxystyrene and N,N-dimethylformamide into a reaction kettle and disperse them evenly. Stir at room temperature for 1-3 hours, filter, wash and dry to obtain modified glass fiber.

[0006] As a further solution of the present invention: the addition ratio of γ-aminopropyltriethoxysilane, succinic anhydride, N,N-dimethylformamide, glass fiber and deionized water in A1 is 5-10g:1-1.2g:50-100mL:10g:10-20mL.

[0007] As a further solution of the present invention: the addition ratio of carboxylated glass fiber, distilled water, potassium persulfate, and dimethyldiallylammonium chloride in A2 is 10 g: 20-40 mL: 0.1-0.2 g: 1-2 mL.

[0008] As a further solution of the present invention: the addition ratio of component 1, p-hydroxystyrene and N,N-dimethylformamide in A3 is 10g:2-4g:50-100mL.

[0009] As a further embodiment of the present invention, the polypropylene is a block polypropylene, the melt mass flow rate of the polypropylene is 0.3 g / 10 min at 230° C. and 2.16 kg, and the melt volume flow rate is 0.33 cm at 230° C. and 2.16 kg. 3 / 10min; This application adjusts the molecular weight of polypropylene to make the pipe density reach 1.2g / cm 3 And above, to achieve silent effect.

[0010] As a further solution of the present invention: the modified glass fiber accounts for 5-15% of the total mass of the glass fiber reinforced polypropylene silent drainage pipe.

[0011] As a further solution of the present invention: the auxiliary agent also includes a lubricant; the lubricant accounts for 0.1-0.3% of the total mass of the glass fiber reinforced polypropylene silent drainage pipe; the lubricant is any one of propylene glycol monostearate and vinyl bisstearamide.

[0012] As a further solution of the present invention: the auxiliary agent also includes an antioxidant; the antioxidant accounts for 0.5-1% of the total mass of the glass fiber reinforced polypropylene silent drainage pipe; the antioxidant is one or more of a phenolic antioxidant and a phosphate antioxidant mixed in any ratio.

[0013] As a further embodiment of the present invention: the phenolic antioxidant is any one of antioxidant 1010, antioxidant 3114, and antioxidant 1330.

[0014] As a further embodiment of the present invention: the phosphate antioxidant is any one of antioxidant 168, antioxidant 622 or antioxidant PEP36.

[0015] As a further solution of the present invention: the extrusion temperature of the twin-screw blending extruder in S2 is 210-240°C.

[0016] A glass fiber reinforced polypropylene silent drainage pipe is made by any one of the above preparation methods.

[0017] Beneficial effects of the present invention: The present application firstly utilizes succinic anhydride to perform carboxyl modification on γ-aminopropyltriethoxysilane to obtain a terminal carboxyl silane coupling agent, and utilizes the hydrolysis reaction of the terminal carboxyl silane coupling agent to perform a condensation reaction with the hydroxyl group on the surface of the glass fiber to graft carboxyl groups on the surface of the glass fiber to obtain carboxylated glass fiber; the present application uses dimethyldiallylammonium chloride as a raw material and utilizes in-situ polymerization to graft a cationic polymer on the surface of the carboxylated glass fiber to obtain component one; finally, the hydroxyl group of p-hydroxystyrene is reacted with the cationic group of component one to obtain a modified glass fiber.

[0018] The present application coats the glass fiber surface with an organic material by chemical grafting, and utilizes the organic long chain on the surface of the modified glass fiber to coat the surface to form a barrier layer through the van der Waals force between molecules and the physical entanglement or cross-linking of the polymer chain, thereby obtaining an organic glass fiber. The present application forms a resin coating on the surface of the glass fiber, which not only improves the dispersion of the glass fiber in the matrix and improves the interfacial bonding force between the glass fiber and the polypropylene matrix, but also improves the tensile strength and notched impact strength of the composite material. When preparing the drainage pipe, the present application melt-grafts the polypropylene and the modified glass fiber, and the interfacial stress and strain generated between the modified glass fiber and the polypropylene material induce the crystallization of the matrix resin cross-linked with the resin coated on the surface of the glass fiber, refines the resin crystallization, effectively adjusts the structural properties of the matrix resin, improves the mechanical properties of the polypropylene, and improves the material's aging resistance and medium aging resistance. DETAILED DESCRIPTION

[0019] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1 The preparation method of modified glass fiber comprises the following steps: A1: 5g of γ-aminopropyltriethoxysilane, 1g of succinic anhydride, and 50mL of N,N-dimethylformamide were added to a reactor and dispersed evenly. 10g of glass fiber (chopped length 4mm, single fiber diameter 13μm) and 10mL of deionized water were mixed and added to the reactor. The temperature was controlled at 50℃, and the reaction was kept warm for 3h. The reaction was centrifuged, washed, and dried to obtain carboxylated glass fiber. A2: Add 10g of carboxylated glass fiber and 20mL of distilled water into a reaction kettle and disperse evenly, add 0.1g of potassium persulfate and 1mL of dimethyldiallylammonium chloride, control the temperature at 50-60℃, keep the reaction for 1h, filter, wash and dry to obtain component 1; A3: Add 10g of component 1, 2g of p-hydroxystyrene and 50mL of N,N-dimethylformamide into a reaction kettle and disperse them evenly. Stir at room temperature for 1-3h, filter, wash and dry to obtain modified glass fiber.

[0021] Example 2 The preparation method of modified glass fiber comprises the following steps: A1: 7g of γ-aminopropyltriethoxysilane, 1g of succinic anhydride, and 50mL of N,N-dimethylformamide were added to a reactor and dispersed evenly. 10g of glass fiber (chopped length 4mm, single fiber diameter 13μm) and 10mL of deionized water were mixed and added to the reactor. The temperature was controlled at 55℃, and the reaction was kept warm for 6h. The reaction was centrifuged, washed, and dried to obtain carboxylated glass fiber. A2: 10g carboxylated glass fiber and 30mL distilled water were added to the reaction kettle and dispersed evenly, 0.1g potassium persulfate and 2mL dimethyldiallylammonium chloride were added, the temperature was controlled at 55°C, the reaction was kept warm for 2h, and then filtered, washed and dried to obtain component 1; A3: Add 10g of component 1, 3g of p-hydroxystyrene and 50mL of N,N-dimethylformamide into a reaction kettle and disperse them evenly. Stir at room temperature for 1h, filter, wash and dry to obtain modified glass fiber.

[0022] Example 3 The preparation method of modified glass fiber comprises the following steps: A1: 10g of γ-aminopropyltriethoxysilane, 1.2g of succinic anhydride, and 100mL of N,N-dimethylformamide were added to a reactor and dispersed evenly. 10g of glass fiber (chopped length 4mm, single fiber diameter 13μm) and 20mL of deionized water were mixed and added to the reactor. The temperature was controlled at 60℃, and the reaction was kept warm for 6h. The mixture was centrifuged, washed, and dried to obtain carboxylated glass fiber. A2: Add 10g carboxylated glass fiber and 40mL distilled water into a reaction kettle and disperse evenly, add 0.2g potassium persulfate and 2mL dimethyldiallylammonium chloride, control the temperature at 60℃, keep the reaction for 1-3h, filter, wash and dry to obtain component 1; A3: Add 10g of component 1, 4g of p-hydroxystyrene and 100mL of N,N-dimethylformamide into a reaction kettle and disperse them evenly. Stir at room temperature for 1-3h, filter, wash and dry to obtain modified glass fiber.

[0023] Example 4 A method for preparing a glass fiber reinforced polypropylene building silent drainage pipe comprises the following steps: S1: 88.7 g of polypropylene, 10 g of the modified glass fiber prepared in Example 1, 0.3 g of glycerol monostearate, 0.5 g of antioxidant 1010, and 0.5 g of antioxidant 168 were mixed to obtain a premix; S2: Extruding and granulating the premixed material through a twin-screw blending extruder at an extrusion temperature of 240° C. to obtain a masterbatch; S3: Injection molding the masterbatch, cooling and shaping it to obtain a glass fiber reinforced polypropylene silent drainage pipe.

[0024] Example 5 A method for preparing a glass fiber reinforced polypropylene building silent drainage pipe comprises the following steps: S1: 88.7 g of polypropylene, 10 g of the modified glass fiber prepared in Example 2, 0.3 g of glycerol monostearate, 0.5 g of antioxidant 1010, and 0.5 g of antioxidant 168 were mixed to obtain a premix; S2: Extruding and granulating the premixed material through a twin-screw blending extruder at an extrusion temperature of 240° C. to obtain a masterbatch; S3: Injection molding the masterbatch, cooling and shaping it to obtain a glass fiber reinforced polypropylene silent drainage pipe.

[0025] Example 6 A method for preparing a glass fiber reinforced polypropylene building silent drainage pipe comprises the following steps: S1: 88.7 g of polypropylene, 10 g of the modified glass fiber prepared in Example 3, 0.3 g of glycerol monostearate, 0.5 g of antioxidant 1010, and 0.5 g of antioxidant 168 were mixed to obtain a premix; S2: Extruding and granulating the premixed material through a twin-screw blending extruder at an extrusion temperature of 240° C. to obtain a masterbatch; S3: Injection molding the masterbatch, cooling and shaping it to obtain a glass fiber reinforced polypropylene silent drainage pipe.

[0026] Comparative Example 1 The preparation method of modified glass fiber comprises the following steps: 7 g of γ-aminopropyltriethoxysilane, 1 g of succinic anhydride, and 50 mL of N,N-dimethylformamide were added into a reactor and dispersed evenly. 10 g of glass fiber (chopped length 4 mm, single fiber diameter 13 μm) and 10 mL of deionized water were blended and added into the reactor. The temperature was controlled at 55°C, and the reaction was kept warm for 6 hours. The mixture was centrifuged, washed, and dried to obtain modified glass fiber.

[0027] Comparative Example 2 The preparation method of modified glass fiber comprises the following steps: A1: 7g of γ-aminopropyltriethoxysilane, 1g of succinic anhydride, and 50mL of N,N-dimethylformamide were added to a reactor and dispersed evenly. 10g of glass fiber (chopped length 4mm, single fiber diameter 13μm) and 10mL of deionized water were mixed and added to the reactor. The temperature was controlled at 55℃, and the reaction was kept warm for 6h. The reaction was centrifuged, washed, and dried to obtain carboxylated glass fiber. A2: Add 10g carboxylated glass fiber and 30mL distilled water into the reactor and disperse evenly, add 0.1g potassium persulfate and 2mL dimethyldiallylammonium chloride, control the temperature at 55℃, keep the reaction for 2h, filter, wash and dry to obtain modified glass fiber.

[0028] Comparative Example 3 Compared with Example 4, Comparative Example 3 is only that the modified glass fiber prepared in Example 1 added in Example 4 is replaced by the modified glass fiber prepared in Comparative Example 1 in equal amount, and the other components and preparation method are completely the same as those in Example 4.

[0029] Comparative Example 4 Compared with Example 4, Comparative Example 4 is only that the modified glass fiber prepared in Example 1 added in Example 4 is replaced by the modified glass fiber prepared in Comparative Example 2 in equal amount, and the other components and preparation method are completely the same as those in Example 4.

[0030] Performance Testing (1) Tensile strength: tested according to GB / T 1040.2-2018 "Test method for tensile properties of plastics", with a tensile rate of 50 mm / min. The test results are shown in Table 1; (2) Simple supported beam notched impact strength: tested according to GB / T 1043.1-2008 “Simple supported beam impact test method for rigid plastics”, with a tensile rate of 50 mm / min. The test results are shown in Table 1. (3) Thermal aging performance test: The test was conducted in accordance with GB / T 7141-2008 "Test methods for thermal aging of plastics". The test conditions were: test temperature 150°C, time 120h. The test results are shown in Table 1. Table 1: Statistical table of mechanical properties test data of Examples 4-6 and Comparative Examples 3-4

[0031] (4) Ring flexibility and ring stiffness: tested according to GB / T 9647-2015 "Determination of Ring Stiffness of Thermoplastic Pipes", with a tensile rate of 50 mm / min. The test results are shown in Table 2; Table 2: Statistical table of pipe performance test data for Examples 4-6 and Comparative Examples 3-4

[0032] It can be seen from Table 1-2 that the modified glass fiber prepared in the present application is added to the raw material of the drainage pipe, which not only improves the aging resistance of the drainage pipe, but also maintains the mechanical properties of the drainage pipe.

[0033] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for preparing a glass fiber reinforced polypropylene building silent drainage pipe, characterized in that: The following steps are involved: S1: According to the raw material ratio, polypropylene, modified glass fiber and additives are mixed to obtain a premix; S2: Extruding and granulating the premixed material through a twin-screw blending extruder to obtain a masterbatch; S3: injecting and cooling the masterbatch to obtain a glass fiber reinforced polypropylene silent drainage pipe; The preparation method of modified glass fiber comprises the following steps: A1: Add γ-aminopropyltriethoxysilane, succinic anhydride and N,N-dimethylformamide into a reactor and disperse them evenly. Blend glass fiber and deionized water and add them into the reactor. Control the temperature at 50-60°C, keep the reaction warm for 3-6 hours, centrifuge, wash and dry to obtain carboxylated glass fiber. A2: Add carboxylated glass fiber and distilled water into a reaction kettle and disperse them evenly, add potassium persulfate and dimethyldiallylammonium chloride, control the temperature at 50-60°C, keep the reaction for 1-3 hours, filter, wash and dry to obtain component 1; A3: Add component 1, p-hydroxystyrene and N,N-dimethylformamide into a reaction kettle and disperse them evenly. Stir at room temperature for 1-3 hours, filter, wash and dry to obtain modified glass fiber.

2. The method for preparing a glass fiber reinforced polypropylene building silent drainage pipe according to claim 1, characterized in that: The addition ratio of γ-aminopropyltriethoxysilane, succinic anhydride, N,N-dimethylformamide, glass fiber and deionized water in A1 is 5-10 g: 1-1.2 g: 50-100 mL: 10 g: 10-20 mL.

3. The method for preparing a glass fiber reinforced polypropylene building silent drainage pipe according to claim 1, characterized in that: The addition ratio of carboxylated glass fiber, distilled water, potassium persulfate, and dimethyldiallylammonium chloride in A2 is 10 g: 20-40 mL: 0.1-0.2 g: 1-2 mL.

4. The method for preparing a glass fiber reinforced polypropylene building silent drainage pipe according to claim 1, characterized in that: The addition ratio of component 1, p-hydroxystyrene and N,N-dimethylformamide in A3 is 10g:2-4g:50-100mL.

5. The method for preparing a glass fiber reinforced polypropylene building silent drainage pipe according to claim 1, characterized in that: The polypropylene is a block polypropylene, and the melt mass flow rate of the polypropylene is 0.3 g / 10 min at 230° C. and 2.16 kg, and the melt volume flow rate is 0.33 cm at 230° C. and 2.16 kg. 3 / 10min.

6. The method for preparing a glass fiber reinforced polypropylene building silent drainage pipe according to claim 1, characterized in that: The modified glass fiber accounts for 5-15% of the total mass of the glass fiber reinforced polypropylene silent drainage pipe.

7. The method for preparing a glass fiber reinforced polypropylene building silent drainage pipe according to claim 1, characterized in that: The auxiliary agent also includes a lubricant; the lubricant accounts for 0.1-0.3% of the total mass of the glass fiber reinforced polypropylene silent drainage pipe; the lubricant is any one of propylene glycol monostearate and vinyl bisstearamide.

8. The method for preparing a glass fiber reinforced polypropylene building silent drainage pipe according to claim 1, characterized in that: The auxiliary agent also includes an antioxidant; the antioxidant accounts for 0.5-1% of the total mass of the glass fiber reinforced polypropylene silent drainage pipe; the antioxidant is one or more of a phenolic antioxidant and a phosphate antioxidant mixed in any ratio.

9. The method for preparing a glass fiber reinforced polypropylene building silent drainage pipe according to claim 1, characterized in that: The extrusion temperature of the twin-screw compounding extruder in S2 is 210-240°C.

10. A glass fiber reinforced polypropylene building silent drainage pipe, characterized in that: Prepared by the preparation method described in any one of claims 1 to 9.

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