Heat-resistant, aging-resistant and impact-resistant water supply pipe and preparation method thereof

Abstract

The invention discloses a heat-resistant, aging-resistant and impact-resistant water supply pipe and a preparation method thereof, and relates to the field of pipes. The heat-resistant, aging-resistant and impact-resistant water supply pipe comprises, in terms of raw materials, 100 parts by weight of linear low-density polyethylene resin, 4-8 parts by weight of polyphenylene sulfide, 3-8 parts by weight of vinyl-terminated polysiloxane, 8-15 parts by weight of methacryloxy polysiloxane, 1-4 parts by weight of pentaerythritol triacrylate, 8-12 parts by weight of filler and 1-2 parts by weight of antioxidant. In the present application, a PE water supply pipe is prepared by cross-linking and modifying a linear low-density polyethylene resin with vinyl-terminated polysiloxane, methacryloxy polysiloxane and pentaerythritol triacrylate, which can improve the impact toughness of the PE water supply pipe while improving the thermal stability of the PE water supply pipe, thereby obtaining a PE water supply pipe having both heat aging stability and impact toughness.

Description

Technical Field

[0001] The present application relates to the field of pipes, and in particular to a heat-resistant, aging-resistant and impact-resistant water supply pipe and a preparation method thereof. Background Art

[0002] Water supply pipes are pipes used to transport and distribute water to users in water supply projects. Commonly used water supply pipes include cast iron pipes, steel pipes, prestressed concrete pipes, galvanized iron pipes, plastic pipes, etc. Plastic pipes are widely used due to their light weight and easy construction.

[0003] PE water pipe, also called polyethylene water pipe, is a kind of plastic pipe. Among them, PE water pipe is made of linear low-density polyethylene resin, filler, antioxidant as raw materials, processed by extrusion molding process, and has the characteristics of corrosion resistance and not easy to scale. In addition, in order to improve the toughness of PE water pipe, people usually add ethylene-vinyl acetate elastomer to high-density polyethylene special resin. However, the heat aging resistance of ethylene-vinyl acetate elastomer is poor, which leads to the reduction of the heat aging resistance of PE water pipe. It is difficult to obtain a water pipe with good heat aging resistance and good impact toughness. Summary of the invention

[0004] In order to improve the problem in the related art that it is difficult for PE water supply pipes to have both heat aging resistance and impact toughness, the present application provides a heat aging resistant and impact resistant water supply pipe and a preparation method thereof.

[0005] In the first aspect, the present application provides a heat-resistant, aging-resistant and impact-resistant water supply pipe adopts the following technical solution:

[0006] A heat-resistant, aging-resistant and impact-resistant water supply pipe comprises, based on raw materials, 100 parts by weight of linear low-density polyethylene resin, 4-8 parts by weight of polyphenylene sulfide, 3-8 parts by weight of vinyl-terminated polysiloxane, 8-15 parts by weight of methacryloyloxy polysiloxane, 1-4 parts by weight of pentaerythritol triacrylate, 8-12 parts by weight of filler and 1-2 parts by weight of antioxidant.

[0007] In the present application, the PE water supply pipe uses linear low-density polyethylene resin as the base resin material. By adding polyphenylene sulfide, an organic compound with an aromatic ring structure, the thermal aging stability of the PE water supply pipe can be improved. Secondly, the linear low-density polyethylene resin is cross-linked and modified by vinyl-terminated polysiloxane, methacryloyloxy polysiloxane and pentaerythritol triacrylate to prepare the PE water supply pipe, which can improve the thermal stability of the PE water supply pipe while improving the impact toughness of the water supply pipe, thereby obtaining a PE water supply pipe with both thermal aging stability and impact toughness. The addition of fillers can increase the strength of the PE water supply pipe and reduce costs. The addition of antioxidants can reduce the thermal degradation of linear low-density polyethylene resins, and is also beneficial to improving the thermal aging stability of PE water supply pipes.

[0008] Preferably, the linear low-density polyethylene resin is 100 parts by weight, the polyphenylene sulfide is 4-8 parts by weight, the vinyl-terminated polysiloxane is 3-5 parts by weight, the methacryloxy polysiloxane is 13-15 parts by weight, the pentaerythritol triacrylate is 2 parts by weight, the filler is 8-12 parts by weight, and the antioxidant is 1-2 parts by weight.

[0009] In the present application, when the weight ratio of linear low-density polyethylene resin, polyphenylene sulfide, vinyl-terminated polysiloxane, methacryloyloxy polysiloxane, pentaerythritol triacrylate, filler and antioxidant is within the above range, the fluidity of the melt can be improved, which is beneficial to further improve the surface smoothness of the PE water supply pipe, and a PE water supply pipe with better anti-scaling performance can be obtained.

[0010] Preferably, the vinyl-terminated polysiloxane is at least one of vinyl-terminated methylphenyl polysiloxane and vinyl-terminated polyphenyl siloxane.

[0011] Compared with vinyl-terminated polydimethylsiloxane, when vinyl-terminated polysiloxane adopts vinyl-terminated methylphenyl polysiloxane, vinyl-terminated polyphenyl siloxane or a combination of the two, it is beneficial to further improve the heat aging resistance of PE water supply pipes. The reason is that vinyl-terminated methylphenyl polysiloxane and vinyl-terminated polyphenyl siloxane both have a benzene ring structure, which can further improve the heat aging resistance of PE water supply pipes.

[0012] Preferably, the filler is modified calcium sulfate whisker, which includes 3-6 parts by weight of calcium sulfate whisker, 1-2 parts by weight of sodium polyphosphate, 3-5 parts by weight of polyacrylamide, 4-8 parts by weight of silane coupling agent and 100 parts by weight of water based on raw materials.

[0013] The needle-like structure of calcium sulfate whiskers can effectively absorb and disperse energy when impacted by external forces, reduce the expansion and propagation of cracks, and thus enhance the impact resistance of PE water supply pipes. However, the bonding stability between calcium sulfate whiskers and linear low-density polyethylene resin is poor. After the PE water supply pipe is stored in a low-temperature environment for a long time, tiny gaps will appear between the calcium sulfate whiskers and the linear low-density polyethylene resin, resulting in the inability of the calcium sulfate whiskers to effectively reduce the expansion and propagation of cracks, thereby causing the poor low-temperature impact resistance of the PE water supply pipe. To this end, the inventors modified the calcium sulfate whiskers using sodium polyphosphate, polyacrylamide, and silane coupling agents, wherein sodium polyphosphate can reduce the surface energy of the calcium sulfate whiskers, improve the surface wettability of the calcium sulfate whiskers, and facilitate the uniform dispersion of the modified calcium sulfate whiskers; polyacrylamide and silane coupling agents can synergistically improve the bonding stability between the calcium sulfate whiskers and the linear low-density polyethylene resin, which is beneficial to improving the low-temperature impact resistance of the PE water supply pipe.

[0014] Preferably, the sodium polyphosphate is at least one of sodium pyrophosphate, sodium tripolyphosphate and sodium hexapolyphosphate.

[0015] Preferably, the molecular weight of the polyacrylamide is 300,000-500,000.

[0016] In the present application, the molecular weight of polyacrylamide is controlled at 300,000-500,000, which is beneficial to promote the uniform dispersion of calcium sulfate whiskers in the modified liquid and can also improve the bonding stability between the modified calcium sulfate whiskers and the linear low-density polyethylene resin.

[0017] Preferably, the silane coupling agent is γ-glycidyloxypropyltrimethoxysilane or a combination of γ-glycidyloxypropyltrimethoxysilane and vinyltrimethoxysilane.

[0018] Preferably, the weight ratio of the γ-glycidyloxypropyltrimethoxysilane to vinyltrimethoxysilane is (3-4):1.

[0019] Preferably, the preparation method of the modified calcium sulfate whisker comprises the following steps:

[0020] Step (1), add sodium polyphosphate, polyacrylamide and silane coupling agent into water and stir until

[0021] After being uniformly dissolved, a modified liquid is obtained;

[0022] Step (2), adding calcium sulfate whiskers to the modified solution, stirring evenly, and ultrasonically treating for 2-3 hours,

[0023] Then the solid and liquid are separated, and the solid is dried to obtain modified calcium sulfate whiskers.

[0024] In the present application, the modified calcium sulfate whiskers can be modified by the above method to obtain modified calcium sulfate whiskers with good bonding stability with linear low-density polyethylene resin, and the method has the advantages of simple steps and convenient operation.

[0025] Preferably, the antioxidant is at least one of antioxidant 1010 and antioxidant 168.

[0026] In the present application, the addition of antioxidant 1010, antioxidant 168, etc. can improve the stability of linear low-density polyethylene resin during the processing process, which is beneficial to improving the heat aging resistance of PE water supply pipes.

[0027] In the second aspect, the present application provides a method for preparing a heat-resistant, aging-resistant and impact-resistant water supply pipe using the following technical solution:

[0028] A method for preparing a heat-resistant, aging-resistant and impact-resistant water supply pipe comprises the following steps:

[0029] Uniformly mixing linear low-density polyethylene resin, polyphenylene sulfide, vinyl-terminated polysiloxane, methacryloxy polysiloxane, pentaerythritol triacrylate, filler and antioxidant to obtain a premix;

[0030] The premix is ​​melt-extruded, radiation-crosslinked, and cooled to obtain a heat-resistant, aging-resistant, and impact-resistant water supply pipe.

[0031] Optionally, the premix melting temperature is 180-190° C., the extrusion temperature is controlled at 195-200° C., and the radiation dose is controlled at 60-80 kGy.

[0032] In the present application, the PE water supply pipe prepared by the above method has both heat resistance stability and impact toughness, and has the advantages of simple steps and convenient operation.

[0033] In summary, this application at least includes the following beneficial effects:

[0034] 1. In the present application, the PE water supply pipe uses linear low-density polyethylene resin as the base resin material. By adding polyphenylene sulfide, an organic compound with an aromatic ring structure, the thermal aging stability of the PE water supply pipe can be improved. Secondly, the linear low-density polyethylene resin is cross-linked and modified by vinyl-terminated polysiloxane, methacryloxy polysiloxane and pentaerythritol triacrylate to prepare the PE water supply pipe. This can improve the thermal stability of the PE water supply pipe while improving the impact toughness of the water supply pipe, thereby obtaining a PE water supply pipe with both thermal aging stability and impact toughness.

[0035] 2. The inventors of the present application used sodium polyphosphate, polyacrylamide and silane coupling agent to modify the calcium sulfate whiskers, wherein sodium polyphosphate can reduce the surface energy of the calcium sulfate whiskers, improve the surface wettability of the calcium sulfate whiskers, and is beneficial to the uniform dispersion of the modified calcium sulfate whiskers; polyacrylamide and silane coupling agent can synergistically improve the bonding stability between the calcium sulfate whiskers and the linear low-density polyethylene resin, which is beneficial to improving the low-temperature impact stability of the PE water supply pipe. DETAILED DESCRIPTION

[0036] The present application is further described below in conjunction with specific experiments. Among them, all raw materials in the present application can be obtained from the market.

[0037] Preparation Example

[0038] [Preparation Example 1]

[0039] A modified calcium sulfate whisker comprises the following raw materials:

[0040] Calcium sulfate whiskers: 4.5kg;

[0041] Silane coupling agent: 6 kg; in this preparation example, the silane coupling agent specifically uses γ-glycidyloxypropyltrimethoxysilane; Water: 100 kg.

[0042] In this preparation example, the preparation method of modified calcium sulfate whiskers comprises the following steps:

[0043] Step (1), adding a silane coupling agent into water, stirring until it is uniformly dissolved, and obtaining a modified solution;

[0044] Step (2), adding calcium sulfate whiskers to the modified liquid, stirring evenly, ultrasonically treating for 2.5 hours, the ultrasonic vibration frequency is 60kHz, then solid-liquid separation, and drying the solid to obtain modified calcium sulfate whiskers.

[0045] [Preparation Example 2]

[0046] A modified calcium sulfate whisker comprises the following raw materials:

[0047] Calcium sulfate whiskers: 4.5kg;

[0048] Polyacrylamide: 4 kg; in this preparation example, the molecular weight of polyacrylamide is 350,000;

[0049] Silane coupling agent: 6 kg; in this preparation example, the silane coupling agent specifically uses γ-glycidyloxypropyltrimethoxysilane; Water: 100 kg.

[0050] In this preparation example, the preparation method of modified calcium sulfate whiskers comprises the following steps:

[0051] Step (1), adding polyacrylamide and silane coupling agent into water, stirring until they are uniformly dissolved, and obtaining a modified solution;

[0052] Step (2), adding calcium sulfate whiskers to the modified liquid, stirring evenly, ultrasonically treating for 2.5 hours, the ultrasonic vibration frequency is 60kHz, then solid-liquid separation, and drying the solid to obtain modified calcium sulfate whiskers.

[0053] [Preparation Example 3]

[0054] A modified calcium sulfate whisker comprises the following raw materials:

[0055] Calcium sulfate whiskers: 4.5kg;

[0056] Sodium polyphosphate: 1.5 kg; in this preparation example, sodium polyphosphate is specifically sodium tripolyphosphate;

[0057] Silane coupling agent: 6 kg; in this preparation example, the silane coupling agent specifically uses γ-glycidyloxypropyltrimethoxysilane; Water: 100 kg.

[0058] In this preparation example, the preparation method of modified calcium sulfate whiskers comprises the following steps:

[0059] Step (1), adding sodium polyphosphate and silane coupling agent into water, stirring until they are uniformly dissolved, to obtain a modified solution;

[0060] Step (2), adding calcium sulfate whiskers to the modified liquid, stirring evenly, ultrasonically treating for 2.5 hours, the ultrasonic vibration frequency is 60kHz, then solid-liquid separation, and drying the solid to obtain modified calcium sulfate whiskers.

[0061] [Preparation Example 4]

[0062] A modified calcium sulfate whisker comprises the following raw materials:

[0063] Calcium sulfate whiskers: 4.5kg;

[0064] Sodium polyphosphate: 1.5 kg; in this preparation example, sodium polyphosphate is specifically sodium tripolyphosphate;

[0065] Polyacrylamide: 4 kg; in this preparation example, the molecular weight of polyacrylamide is 350,000;

[0066] Silane coupling agent: 6 kg; in this preparation example, the silane coupling agent specifically uses γ-glycidyloxypropyltrimethoxysilane; Water: 100 kg.

[0067] In this preparation example, the preparation method of modified calcium sulfate whiskers comprises the following steps:

[0068] Step (1), adding sodium polyphosphate, polyacrylamide and silane coupling agent into water, stirring until they are uniformly dissolved, and obtaining a modified solution;

[0069] Step (2), adding calcium sulfate whiskers to the modified liquid, stirring evenly, ultrasonically treating for 2.5 hours, the ultrasonic vibration frequency is 60kHz, then solid-liquid separation, and drying the solid to obtain modified calcium sulfate whiskers.

[0070] Example

[0071] [Example 1]

[0072] A heat-resistant, aging-resistant and impact-resistant water supply pipe, comprising the following raw materials:

[0073] Linear low-density polyethylene resin: 100 kg; in this embodiment, the linear low-density polyethylene resin is a linear low-density polyethylene resin with a brand of XP9000 produced by Dalin, South Korea;

[0074] Polyphenylene sulfide: 4 kg; In this embodiment, the polyphenylene sulfide is polyphenylene sulfide of Japanese Toray model A504X90;

[0075] Vinyl-terminated methylphenyl polysiloxane: 8 kg; in this embodiment, the model of vinyl-terminated methylphenyl polysiloxane is IOTA252;

[0076] Methacryloxy polysiloxane: 8 kg; wherein the structural formula of methacryloxy polysiloxane is as follows:

[0077]

[0078] In this embodiment, the viscosity of methacryloxy polysiloxane is 20 mPa.s;

[0079] Pentaerythritol triacrylate: 4kg;

[0080] Filler: 12 kg; in this embodiment, the filler is specifically modified calcium sulfate whiskers prepared in [Preparation Example 1];

[0081] Antioxidant: 1 kg; in this embodiment, the antioxidant specifically uses antioxidant 1010.

[0082] In this embodiment, a method for preparing a heat-resistant, aging-resistant and impact-resistant water supply pipe comprises the following steps:

[0083] Uniformly mixing linear low-density polyethylene resin, polyphenylene sulfide, vinyl-terminated polysiloxane, methacryloxy polysiloxane, pentaerythritol triacrylate, filler and antioxidant to obtain a premix;

[0084] The premix is ​​melt-extruded, radiation-crosslinked, and cooled to obtain a heat-resistant, aging-resistant, and impact-resistant water supply pipe; wherein the melting temperature of the premix is ​​controlled at 180-190°C, the extrusion temperature is controlled at 195°C, and the radiation dose is controlled at 60kGy.

[0085] [Example 2]

[0086] A heat-resistant, aging-resistant and impact-resistant water supply pipe, comprising the following raw materials:

[0087] Linear low-density polyethylene resin: 100 kg; in this embodiment, the linear low-density polyethylene resin adopts the linear low-density polyethylene resin with a brand of XP9200 produced by Dalin, South Korea;

[0088] Polyphenylene sulfide: 8 kg; in this embodiment, the polyphenylene sulfide is polyphenylene sulfide of Japanese Polyplastics brand 1130A1;

[0089] Vinyl-terminated methylphenyl polysiloxane: 8 kg; in this embodiment, vinyl-terminated polyphenyl siloxane was purchased from Wuhan Kemik Biopharmaceutical Technology Co., Ltd., and the cas is 225927-21-9;

[0090] Methacryloxy polysiloxane: 8 kg; wherein the structural formula of methacryloxy polysiloxane is as follows:

[0091]

[0092] In this embodiment, the viscosity of methacryloxy polysiloxane is 25 mPa.s;

[0093] Pentaerythritol triacrylate: 4kg;

[0094] Filler: 8 kg; in this embodiment, the filler is specifically modified calcium sulfate whiskers prepared in [Preparation Example 1];

[0095] Antioxidant: 2 kg; in this embodiment, the antioxidant includes antioxidant 1010 and antioxidant 168, and the weight ratio of antioxidant 1010 to antioxidant 168 is 3:1.

[0096] In this embodiment, a method for preparing a heat-resistant, aging-resistant and impact-resistant water supply pipe comprises the following steps:

[0097] Uniformly mixing linear low-density polyethylene resin, polyphenylene sulfide, vinyl-terminated polysiloxane, methacryloxy polysiloxane, pentaerythritol triacrylate, filler and antioxidant to obtain a premix;

[0098] The premix is ​​melt-extruded, radiation-crosslinked, and cooled to obtain a heat-resistant, aging-resistant, and impact-resistant water supply pipe; wherein the melting temperature of the premix is ​​controlled at 180-190°C, the extrusion temperature is controlled at 195°C, and the radiation dose is controlled at 80kGy.

[0099] [Example 3]

[0100] A heat-resistant, aging-resistant and impact-resistant water supply pipe, which is different from [Example 1] in that the amounts of vinyl-terminated methylphenyl polysiloxane, methacryloyloxy polysiloxane and pentaerythritol triacrylate are different.

[0101] In this embodiment, the amount of vinyl-terminated methylphenyl polysiloxane used is 3 kg, the amount of methacryloxy polysiloxane used is 15 kg, and the amount of pentaerythritol triacrylate used is 2 kg.

[0102] [Example 4]

[0103] A heat-resistant, aging-resistant and impact-resistant water supply pipe, which is different from [Example 1] in that the amounts of vinyl-terminated methylphenyl polysiloxane, methacryloyloxy polysiloxane and pentaerythritol triacrylate are different.

[0104] In this embodiment, the amount of vinyl-terminated methylphenyl polysiloxane used is 5 kg, the amount of methacryloxy polysiloxane used is 13 kg, and the amount of pentaerythritol triacrylate used is 2 kg.

[0105] [Example 5]

[0106] A heat-resistant, aging-resistant and impact-resistant water supply pipe, which is different from [Example 1] in that the amounts of vinyl-terminated methylphenyl polysiloxane, methacryloyloxy polysiloxane and pentaerythritol triacrylate are different.

[0107] In this embodiment, the amount of vinyl-terminated methylphenyl polysiloxane used is 8 kg, the amount of methacryloxy polysiloxane used is 10 kg, and the amount of pentaerythritol triacrylate used is 2 kg.

[0108] [Example 6]

[0109] A heat-resistant, aging-resistant and impact-resistant water supply pipe, which is different from [Example 1] in that the amounts of vinyl-terminated methylphenyl polysiloxane, methacryloyloxy polysiloxane and pentaerythritol triacrylate are different.

[0110] In this embodiment, the amount of vinyl-terminated methylphenyl polysiloxane used is 6 kg, the amount of methacryloxy polysiloxane used is 10 kg, and the amount of pentaerythritol triacrylate used is 4 kg.

[0111] [Example 7]

[0112] A heat-resistant, aging-resistant and impact-resistant water supply pipe, which differs from [Example 4] in that the filler is different.

[0113] In this embodiment, the filler is the modified calcium sulfate whisker prepared in [Preparation Example 2].

[0114] [Example 8]

[0115] A heat-resistant, aging-resistant and impact-resistant water supply pipe, which differs from [Example 4] in that the filler is different.

[0116] In this embodiment, the filler is the modified calcium sulfate whisker prepared in [Preparation Example 3].

[0117] [Example 9]

[0118] A heat-resistant, aging-resistant and impact-resistant water supply pipe, which differs from [Example 4] in that the filler is different.

[0119] In this embodiment, the filler is the modified calcium sulfate whisker prepared in [Preparation Example 4].

[0120] Comparative Example

[0121] [Comparative Example 1]

[0122] A PE water supply pipe, which differs from [Example 1] in that:

[0123] The methacryloxy polysiloxane was replaced with an equal amount of vinyl terminated polysiloxane.

[0124] [Comparative Example 2]

[0125] A PE water supply pipe, which differs from [Example 1] in that:

[0126] Pentaerythritol triacrylate was replaced by an equal amount of vinyl terminated polysiloxane.

[0127] Performance testing

[0128] 1. Heat aging resistance: The water supply pipe was aged continuously in an oven at 135°C for 7 days, and the hydrostatic strength test results of the water supply pipe before and after heat aging were compared. In the hydrostatic strength test, the total number of water supply pipe samples of each embodiment and comparative example was 10, the test temperature was 20°C, the test time was 6 hours, and the hydrostatic pressure was 16 MPa. After the test, it was recorded whether the water supply pipe samples of each embodiment and comparative example were ruptured or leaked, and the results were recorded in the following Table 1.

[0129] 2. The surface roughness of the inner and outer surfaces of the water supply pipe samples prepared in each embodiment and comparative example was tested, and the results were recorded in the following Table 2. The unit of surface roughness is μm, and the smaller the surface roughness, the better the surface smoothness of the water supply pipe and the better the anti-fouling property.

[0130] 3. Impact resistance: The water supply pipes prepared in each embodiment and comparative example were tested with reference to method A in GB / T 18743.1-2022 Determination of simply supported beam impact strength of thermoplastic plastic pipes. The test results were expressed by the impact breakage rate of the specimens. The total number of pipe samples in each embodiment and comparative example in this application was 20, and the breakage rate test results are shown in Table 3. Among them, the impact breakage rate of the simply supported beam impact test of the water supply pipe is ≤10% to meet the requirements, and the impact resistance of the water supply pipes when stored at different temperatures is compared.

[0131] Table 1

[0132]

[0133]

[0134] Table 2

[0135]

[0136] Table 3

[0137]

[0138] By comparing Example 1 with Comparative Examples 1-2 and combining the data in Tables 1-3, it can be seen that the water supply pipe prepared by cross-linking and modifying the linear low-density polyethylene resin with vinyl-terminated polysiloxane, methacryloyloxy polysiloxane and pentaerythritol triacrylate has both heat aging stability and impact resistance. At the same time, the surface roughness of the inner and outer surfaces of the water supply pipe is low and the scale resistance is good.

[0139] By comparing Example 1 with Examples 3-6 and combining the data in Table 1-3, it can be seen that: by keeping the sum of the weights of vinyl-terminated polysiloxane, methacryloxy polysiloxane and pentaerythritol triacrylate unchanged, and changing the weight of vinyl-terminated polysiloxane, methacryloxy polysiloxane and pentaerythritol triacrylate added, when the weight ratio of linear low-density polyethylene resin, vinyl-terminated polysiloxane, methacryloxy polysiloxane and pentaerythritol triacrylate is 100:(3-5):(13-15):2, the fluidity of the melt can be improved, which is beneficial to further improve the surface smoothness of the PE water pipe, and a PE water pipe with better anti-scaling performance can be obtained.

[0140] By comparing Example 4 with Examples 7-9 and combining the data in Tables 1-3, it can be seen that the calcium sulfate whiskers are modified by sodium polyphosphate, polyacrylamide and silane coupling agent. Sodium polyphosphate can reduce the surface energy of the calcium sulfate whiskers and improve the surface wettability of the calcium sulfate whiskers. Polyacrylamide and silane coupling agent can synergistically improve the bonding stability between the calcium sulfate whiskers and the linear low-density polyethylene resin, which is beneficial to improving the low-temperature impact stability of the PE water supply pipe.

[0141] This specific implementation manner is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the specific implementation manner as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A heat-resistant, aging-resistant and impact-resistant water supply pipe, characterized in that: Calculated by raw materials, it includes 100 parts by weight of linear low-density polyethylene resin, 4-8 parts by weight of polyphenylene sulfide, 3-8 parts by weight of vinyl-terminated polysiloxane, 8-15 parts by weight of methacryloxy polysiloxane, 1-4 parts by weight of pentaerythritol triacrylate, 8-12 parts by weight of filler and 1-2 parts by weight of antioxidant; The vinyl-terminated polysiloxane is at least one of vinyl-terminated methylphenyl polysiloxane and vinyl-terminated polyphenyl siloxane; The filler is modified calcium sulfate whisker. Calculated by raw materials, the modified calcium sulfate whisker includes 3-6 parts by weight of calcium sulfate whisker, 1-2 parts by weight of sodium polyphosphate, 3-5 parts by weight of polyacrylamide, 4-8 parts by weight of silane coupling agent and 100 parts by weight of water.

2. The heat-resistant, aging-resistant and impact-resistant water supply pipe according to claim 1, characterized in that: The linear low-density polyethylene resin is 100 parts by weight, the polyphenylene sulfide is 4-8 parts by weight, the vinyl-terminated polysiloxane is 3-5 parts by weight, the methacryloxy polysiloxane is 13-15 parts by weight, the pentaerythritol triacrylate is 2 parts by weight, the filler is 8-12 parts by weight, and the antioxidant is 1-2 parts by weight.

3. The heat-resistant, aging-resistant and impact-resistant water supply pipe according to claim 1, characterized in that: The sodium polyphosphate is at least one of sodium tripolyphosphate and sodium hexapolyphosphate.

4. The heat-resistant, aging-resistant and impact-resistant water supply pipe according to claim 1, characterized in that: The molecular weight of the polyacrylamide is 300,000-500,000.

5. The heat-resistant, aging-resistant and impact-resistant water supply pipe according to claim 1, characterized in that: The silane coupling agent is γ-glycidyloxypropyltrimethoxysilane or a combination of γ-glycidyloxypropyltrimethoxysilane and vinyltrimethoxysilane.

6. The heat-resistant, aging-resistant and impact-resistant water supply pipe according to claim 1, characterized in that: The preparation method of the modified calcium sulfate whisker comprises the following steps: Step (1), add sodium polyphosphate, polyacrylamide and silane coupling agent into water and stir until After being uniformly dissolved, a modified liquid is obtained; Step (2), add calcium sulfate whiskers to the modified solution, stir evenly, and perform ultrasonic treatment for 2-3 hours. Then the solid and liquid are separated, and the solid is dried to obtain modified calcium sulfate whiskers.

7. A heat-resistant, aging-resistant and impact-resistant water supply pipe according to claim 1 or 2, characterized in that: The antioxidant is at least one of the antioxidant 1010 and the antioxidant 168 .

8. A method for preparing a heat-resistant, aging-resistant and impact-resistant water supply pipe according to any one of claims 1 to 7, characterized in that: The following steps are involved: Linear low-density polyethylene resin, polyphenylene sulfide, vinyl-terminated polysiloxane, methacrylic acid The acyloxy polysiloxane, pentaerythritol triacrylate, filler and antioxidant are uniformly mixed to obtain a premix; The premix is ​​melt-extruded, radiation-crosslinked, and cooled to obtain a heat-resistant, aging-resistant, and impact-resistant water supply pipe.

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