A super-strong soundproof building drain pipe and its preparation method

Abstract

The present invention discloses a super-silent building drain pipe and a preparation method thereof, relating to the technical field of polymer materials. The raw materials include the following parts by mass: 100 parts of high-density polyethylene, 5-7 parts of cold-resistant toughening agent, 8-12 parts of synergist, 8-10 parts of sound insulation filler, and 0.3-0.5 parts of antioxidant. The introduction of the synergist prepared from components such as polyamino polyether methylene phosphonic acid, zinc nitrate hexahydrate, and magnesium nitrate hexahydrate in the present invention can effectively improve the sound insulation, flame retardancy, and smoke suppression capabilities of the drain pipe; while the introduction of the sound insulation filler prepared from components such as modified halloysite nanotubes, hydroxyl-terminated polydimethylsiloxane, and aziridine crosslinking agent in the present invention further improves the sound insulation, flame retardancy, and smoke suppression capabilities of the drain pipe. Therefore, the drain pipe prepared by the present invention has a broader application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and particularly relates to a super-silent building drain pipe and a preparation method thereof. Background Art

[0002] High-density polyethylene is a general-purpose plastic with non-polarity and high crystallinity. Due to its low price, light weight, strong rigidity, and excellent processing performance, after long-term development, it has shown great application prospects in the fields of pipe materials such as gas pipes, water supply pipes, and sewage pipes. However, when the existing high-density polyethylene-based drain pipes drain water, the noise generated by the water flow impacting the pipe wall is easily transmitted to the room through the wall, which will seriously affect the comfort of the living and working environments; and the drain pipes are prone to burning and spreading flames during a fire, and a large amount of black smoke and toxic gases will be released during combustion.

[0003] Therefore, the sound insulation ability and flame retardant and smoke suppression ability of high-density polyethylene-based drain pipes still need to be improved. Summary of the Invention

[0004] The purpose of the present invention is to provide a super-silent building drain pipe and a preparation method thereof, and solve the following technical problems:

[0005] The existing high-density polyethylene-based drain pipes still have problems of relatively poor sound insulation, flame retardancy, and smoke suppression ability.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A super-silent building drain pipe, comprising the following raw materials in parts by mass: 100 parts of high-density polyethylene, 5 - 7 parts of cold-resistant toughening agent, 8 - 12 parts of synergist, 8 - 10 parts of sound insulation filler, and 0.3 - 0.5 part of antioxidant.

[0008] Preferably, the preparation method of the synergist is as follows:

[0009] A1: Add polyamino polyether methylene phosphonic acid and sodium dodecyl sulfate to deionized water, and stir at 50 - 60 °C for 15 - 25 min to obtain an organic dispersion;

[0010] A2: Add sodium molybdate dihydrate to deionized water and perform ultrasonic dispersion for 8 - 10 min to obtain a sodium molybdate solution;

[0011] A3: Dissolve zinc nitrate hexahydrate, magnesium nitrate hexahydrate, and citric acid in deionized water. Then, while stirring at 50 - 80 °C, slowly drip in the sodium molybdate solution. After stirring for 30 - 40 min, while stirring at 60 - 90 °C, adjust the pH to 9 - 11 with 2 mol / L sodium hydroxide solution. After stirring for 1 - 2 h, add stearic acid and stir at 75 - 80 °C for 30 - 40 min. Cool to 25 - 30 °C and centrifuge at 6000 - 7000 r / min for 8 - 10 min. Wash the separated precipitate with deionized water 3 - 5 times, then wash it with 0.1 mol / L ammonium bicarbonate aqueous solution 2 times. Finally, dry it at 60 - 80 °C for 12 - 24 h to obtain composite particles;

[0012] A4: Dissolve the composite particles in deionized water, then add the organic dispersion and stir at 300 - 400 r / min for 30 - 40 min. Then add the sodium hydroxide solution and centrifuge at a speed of 2800 - 3000 r / min for 10 - 15 min. Let it stand for 7 - 9 h, then filter and wash the precipitate with deionized water 4 - 6 times. After drying at 98 - 100 °C for 12 - 14 h, grind it and sieve it through a 400 - mesh sieve to obtain the synergist.

[0013] Preferably, the mass ratio of the polyamino polyether methylene phosphonic acid, sodium dodecyl sulfate, and deionized water described in A1 is 25 - 30: 0.4 - 0.5: 25 - 30;

[0014] The mass ratio of the deionized water and sodium molybdate dihydrate described in A2 is 200 - 300: 2.4 - 7.2;

[0015] The power during ultrasonic dispersion described in A2 is 300 - 400 W, and the frequency is 38 - 40 kHz.

[0016] Preferably, the mass ratio of the zinc nitrate hexahydrate, magnesium nitrate hexahydrate, citric acid, deionized water, sodium molybdate solution, and stearic acid described in A3 is 3 - 9: 5.1 - 30.6: 1 - 2: 200 - 300: 202.4 - 307.2: 1 - 3; [[ID=!7]]

[0017] The mass ratio of the composite particles, deionized water, organic dispersion, and sodium hydroxide solution described in A4 is 10 - 12: 40 - 48: 50 - 60: 100 - 120;

[0018] The mass fraction of the sodium hydroxide solution described in A4 is 10%.

[0019] Preferably, the preparation method of the sound insulation filler is as follows:

[0020] B1: Calcinate halloysite nanotubes at 340 - 350 °C for 2 - 2.5 h, then cool to 25 - 35 °C. After that, add them to a hydrochloric acid solution and perform ultrasonic treatment for 30 - 40 min. Filter and wash the precipitate with deionized water 3 - 5 times, then vacuum dry at 78 - 82 °C for 12 - 15 h to obtain pretreated halloysite nanotubes;

[0021] B2: Mix silane coupling agent KH550 and absolute ethanol evenly, then adjust the pH to 5 - 6. After reacting for 45 - 50 min, add the pretreated halloysite nanotubes and stir - react at 68 - 72 °C at 580 - 600 r / min for 4 - 4.5 h. After centrifugal separation, wash with absolute ethanol 3 - 5 times, then vacuum dry at 78 - 82 °C for 12 - 15 h to obtain modified halloysite nanotubes;

[0022] B3: Mix the modified halloysite nanotubes and hydroxyl - terminated polydimethylsiloxane and ball - mill at 400 r / min for 5 - 6 h. Then add aziridine cross - linker and cross - link at 58 - 62 °C for 2 - 2.2 h. Filter and wash with deionized water 4 - 6 times, then add to absolute ethanol and perform high - pressure homogenization treatment. Finally, vacuum dry at 58 - 62 °C for 20 - 24 h and pass through a 200 - mesh sieve to obtain sound - insulating filler.

[0023] Preferably, the mass ratio of the halloysite nanotubes to the hydrochloric acid solution in B1 is 80 - 100:100 - 150;

[0024] The concentration of the hydrochloric acid solution in B1 is 1 mol / L;

[0025] The power during the ultrasonic treatment in B1 is 300 - 400 W, and the frequency is 38 - 40 kHz.

[0026] Preferably, the mass ratio of the silane coupling agent KH550, absolute ethanol, and pretreated halloysite nanotubes in B2 is 1.5 - 2.3:80 - 125:10 - 15.

[0027] Preferably, the mass ratio of the modified halloysite nanotubes, hydroxyl - terminated polydimethylsiloxane, aziridine cross - linker, and absolute ethanol in B3 is 10 - 12:30 - 36:0.4 - 0.5:160 - 240;

[0028] The pressure during the high - pressure homogenization treatment in B3 is 100 - 110 MPa, the number of times is 3 times, and the duration of each time is 1 - 3 min.

[0029] Preferably, the preparation method of the antioxidant is as follows:

[0030] Mix antioxidant 1010 and antioxidant 168 evenly to obtain the antioxidant;

[0031] The mass ratio of the antioxidant 1010 to the antioxidant 168 is 1 - 2:1 - 2.

[0032] A preparation method of a super - quiet building drain pipe includes the following steps:

[0033] Add a cold - resistant toughening agent, a synergist, a sound - insulating filler, and an antioxidant into high - density polyethylene, stir at 300 - 400 r / min for 4 - 6 min, then feed it into an extruder. After being compressed, plasticized by the screw and continuously extruded through the die, it is loaded into a sizing sleeve at 18 - 22 °C for cooling. After cooling to 25 - 35 °C, it is cut to a fixed length to obtain the super - quiet building drain pipe.

[0034] As a further scheme of the present invention.

[0035] The beneficial effects of the present invention:

[0036] The present invention provides a super - quiet building drain pipe and its preparation method. The present invention effectively improves the sound - insulation, flame - retardant and smoke - suppression capabilities of the high - density polyethylene - based drain pipe through the following method.

[0037] (1) When the polyamino polyether methylene phosphonic acid in the synergist of the present invention decomposes by heating, a carbon layer containing phosphoric anhydride / phosphoric acid will be formed, isolating oxygen and heat, and inhibiting the release of combustible gases; at the same time, phosphorus-containing free radicals are released to capture the active groups in the combustion chain reaction, slowing down the combustion rate; it will also produce a synergistic effect with the metal oxides generated by the decomposition of zinc nitrate hexahydrate and magnesium nitrate, promoting the formation of the carbon layer and enhancing its compactness, inhibiting melting and dripping, and improving the flame retardancy efficiency. The metal oxide generated by the decomposition of sodium molybdate dihydrate can adsorb soot precursors such as carbon free radicals generated during combustion, inhibiting the formation of soot; at the same time, it can catalyze the oxidation of carbon to carbon dioxide, reducing the smoke generated by incomplete combustion; it will also produce a synergistic effect with the metal oxides generated by the decomposition of zinc nitrate hexahydrate and magnesium nitrate, regulating the combustion reaction path, reducing the generation of smoke components, effectively reducing the smoke release amount during material combustion, and improving the smoke suppression property. The metal oxides and stearic acid-modified particles in the synergist have relatively high density and rigidity. Dispersed in the high-density polyethylene matrix, they increase the material density and improve the barrier ability to medium and high-frequency sound waves; they can also dissipate vibration energy due to the modulus difference between the particles and the matrix, enhancing the absorption of low-frequency sound waves; the dispersing effect of sodium dodecyl sulfate and citric acid can also ensure the uniform distribution of the particles, avoiding structural defects caused by agglomeration and optimizing the sound insulation effect. The phosphorus-based compound and the metal oxide can inhibit the thermal oxidative degradation of high-density polyethylene and delay the thermal decomposition temperature; the stearic acid-modified particles can reduce the interfacial defects between the filler and the matrix and reduce the thermal stress concentration. The nano-scale composite particles, as rigid fillers, can bear part of the load after being uniformly dispersed, increasing the tensile strength and elastic modulus; the surface modification of citric acid and stearic acid improves the compatibility between the particles and high-density polyethylene, reducing stress concentration and avoiding brittle fracture caused by filler agglomeration; at the same time, the flexible chain segments of polyamino polyether methylene phosphonic acid may enhance the toughness of the matrix.

[0038] (2) The hollow tubular structure and high aspect ratio of halloysite nanotubes in the sound insulation filler of the present invention can effectively scatter and absorb acoustic energy, especially having a good blocking effect on medium and high frequency noises. After specific high-temperature treatment and hydrochloric acid treatment, their polarity, dispersibility, and reactivity are improved, thereby further enhancing the sound insulation and mechanical properties of the pipe. Polydimethylsiloxane will form a network structure with aziridine crosslinking agent, dissipate energy through vibration damping, and reduce the vibration transmission of the pipe. The flexible chain segments and crosslinked network of siloxane can also improve the impact resistance of the composite material, avoiding the increase in brittleness caused by the agglomeration of nano-fillers. Especially in a low-temperature environment, combined with a cold-resistant toughening agent, the impact resistance can be greatly improved. The layered structure of halloysite nanotubes can form a physical barrier during combustion, inhibit the transfer of heat and oxygen, and slow down the combustion rate. When polydimethylsiloxane burns, it will generate a "silica-silicon carbide" carbon layer, isolating combustibles and inhibiting smoke generation. The high specific surface area of nano-fillers can adsorb free radicals generated during the combustion process, and cooperate with antioxidants to enhance the flame retardancy and smoke suppression effect. The rigidity and uniform dispersion of nano-fillers will reduce the deformation at high temperature, and the crosslinked structure restricts the movement of molecular chains, improving the heat resistance deformation ability. The surface silanization of modified halloysite reduces polar groups, lowering the hygroscopicity and the risk of chemical corrosion.

[0039] (3) The cold-resistant toughening agent (polyolefin elastomer grafted with maleic anhydride) in the present invention can improve the toughness and impact resistance of the material, especially in a low-temperature environment. The elastic structure of the polyolefin elastomer molecular chain can absorb external impact energy, reduce crack propagation, and significantly improve the elongation at break and low-temperature impact strength of the material. In addition, the maleic anhydride grafted group can enhance the interfacial compatibility with high-density polyethylene and other polar components through polar interactions, further optimizing the overall mechanical uniformity. The elastomer characteristics of the cold-resistant toughening agent can improve the damping performance of the material, enhance the absorption ability of vibration and sound waves, especially having an improvement effect on the low-frequency noise generated by the fluid flow in the pipeline. At the same time, its good compatibility with high-density polyethylene can reduce phase separation, form a uniform blend system, and avoid the decline in sound insulation performance caused by interfacial defects. The polyolefin elastomer itself has excellent low-temperature toughness. After grafting, it can significantly improve the low-temperature resistance and embrittlement temperature of high-density polyethylene, making the material not easy to crack in a low-temperature environment and extending the service life. The polyolefin elastomer has good thermal stability and can cooperate with the antioxidants compounded in the present invention to inhibit oxidative degradation during processing and use, enhancing the long-term thermal stability. The polarity of the maleic anhydride group may enhance the interaction with antioxidants, indirectly optimizing the antioxidant effect.

[0040] Therefore, the high-density polyethylene-based drainage pipe prepared by the present invention has excellent sound insulation, flame retardancy, and smoke suppression capabilities, as well as a broader application prospect. Specific Embodiments

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] Unless otherwise specified, the information of some raw materials used in the following examples and comparative examples of the present invention is as follows:

[0043] Polyamino polyether methylene phosphonic acid was purchased from Shandong Taihe Technology Co., Ltd.; halloysite nanotubes (purity ≥ 95%, tube diameter 50 - 70 nm, length 1 - 2 μm) were purchased from Guangdong Jinna New Materials Technology Co., Ltd.; hydroxyl-terminated polydimethylsiloxane was purchased from Wuhan Shu'er Biotechnology Co., Ltd., product number: 08778; aziridine crosslinking agent was purchased from Wuhan Karnos Technology Co., Ltd.; antioxidant 1010 was purchased from Hubei Yongkuo Technology Co., Ltd., product number: YK0663; antioxidant 168 was purchased from Hubei Widely Chemical Reagent Co., Ltd., product number: HBWS-1778063; high-density polyethylene was purchased from Dongguan Zhangmutou Keruida Plastic Business Department, model: M7100; cold-resistant toughening agent was purchased from Haozheng New Materials Technology (Dongguan) Co., Ltd., product number: R905.

[0044] Example 1: A preparation method of a super-strong soundproof building drainage pipe is as follows:

[0045] S1: Add 25 g of polyamino polyether methylene phosphonic acid and 0.4 g of sodium dodecyl sulfate to 25 mL of deionized water, and stir at 300 r / min for 15 min at 50 °C to obtain an organic dispersion;

[0046] S2: Add 2.4 g of sodium molybdate dihydrate to 200 mL of deionized water and perform ultrasonic dispersion at a power of 300 W and a frequency of 38 kHz for 8 min to obtain a sodium molybdate solution;

[0047] S3: Dissolve 3 g of zinc nitrate hexahydrate, 5.1 g of magnesium nitrate hexahydrate, and 1 g of citric acid in 200 mL of deionized water, then drop 202.4 g of the sodium molybdate solution into it while stirring at 50 °C at a rate of 3 mL / min. After stirring for 30 min, adjust the pH to 9 with 2 mol / L sodium hydroxide solution while stirring at 60 °C, continue stirring for 1 h, then add 1 g of stearic acid and stir at 75 °C for 30 min. After cooling to 25 °C, centrifuge at 6000 r / min for 8 min. The separated precipitate is first washed 3 times with deionized water, then washed 2 times with 0.1 mol / L ammonium bicarbonate aqueous solution, and finally dried at 60 °C for 12 h to obtain composite particles;

[0048] S4: Dissolve 10 g of the composite particles in 40 mL of deionized water, then add 50 g of the organic dispersion and stir at 300 r / min for 30 min. Then add 100 g of a 10% sodium hydroxide solution and centrifuge at 2,800 r / min for 10 min. Let it stand for 7 h, then filter and wash the precipitate with deionized water 4 times. After drying at 98 °C for 12 h, grind it and sieve it through a 400-mesh sieve to obtain the synergist;

[0049] S5: Calcinate 80 g of halloysite nanotubes at 340 °C for 2 h and then cool to 25 °C. Then add them to 100 g of a hydrochloric acid solution with a concentration of 1 mol / L and perform ultrasonic treatment at a power of 300 W and a frequency of 38 kHz for 30 min. Filter and wash the precipitate with deionized water 3 times, and then vacuum dry at 78 °C for 12 h to obtain pretreated halloysite nanotubes;

[0050] S6: Mix 1.5 g of silane coupling agent KH550 with 80 g of absolute ethanol evenly, then adjust the pH to 5 with acetic acid. After reacting for 45 min, add 10 g of pretreated halloysite nanotubes and stir and react at 68 °C at 580 r / min for 4 h. After centrifugal separation, wash with absolute ethanol 3 - 5 times, and then vacuum dry at 78 °C for 12 h to obtain modified halloysite nanotubes;

[0051] S7: Mix 10 g of modified halloysite nanotubes with 30 g of hydroxyl-terminated polydimethylsiloxane and ball mill at 400 r / min for 5 h. Then add 0.4 g of aziridine crosslinking agent and crosslink at 58 °C for 2 h. Filter and wash with deionized water 4 times, then add to 160 g of absolute ethanol and perform high-pressure homogenization treatment at 100 MPa for 1 min each time for 3 times. Finally, vacuum dry at 58 °C for 20 h and sieve through a 200-mesh sieve to obtain the sound insulation filler;

[0052] S8: Mix 1 g of antioxidant 1010 and 1 g of antioxidant 168 evenly to obtain the antioxidant;

[0053] S9: Add 5 g of cold-resistant toughening agent, 8 g of synergist, 8 g of sound insulation filler, and 0.3 g of antioxidant to 100 g of high-density polyethylene. Stir at 300 r / min for 4 min, then feed it into an extruder. After being compressed, plasticized by the screw and continuously extruded through the die, it is loaded into a sizing sleeve at 18 °C for cooling. After cooling to 25 °C, perform fixed-length cutting to obtain the super-strong soundproof building drain pipe.

[0054] Example 2: A preparation method of a super-strong soundproof building drain pipe is as follows:

[0055] S1: Add 27.5 g of polyamino polyether methylene phosphonic acid and 0.45 g of sodium dodecyl sulfate to 28 mL of deionized water, and stir at 55 °C at 330 r / min for 20 min to obtain the organic dispersion;

[0056] S2: Add 4.8 g of sodium molybdate dihydrate to 250 mL of deionized water and perform ultrasonic dispersion at a power of 350 W and a frequency of 39 kHz for 9 min to obtain a sodium molybdate solution;

[0057] S3: Dissolve 6 g of zinc nitrate hexahydrate, 17.9 g of magnesium nitrate hexahydrate, and 1.5 g of citric acid in 250 mL of deionized water. Then, while stirring at 70 °C, slowly drip 254.8 g of the sodium molybdate solution at a rate of 4 mL / min. After stirring for 35 min, adjust the pH to 10 with 2 mol / L sodium hydroxide solution while stirring at 75 °C. Continuously stir for 1.5 h, then add 2 g of stearic acid and stir at 78 °C for 35 min. After cooling to 28 °C, centrifuge at 6500 r / min for 9 min. Wash the separated precipitate 4 times with deionized water, then wash it 2 times with 0.1 mol / L ammonium bicarbonate aqueous solution, and finally dry it at 70 °C for 18 h to obtain composite particles;

[0058] S4: Dissolve 11 g of the composite particles in 44 mL of deionized water, then add 55 g of the organic dispersion and stir at 350 r / min for 35 min. Then add 110 g of 10% sodium hydroxide solution and centrifuge at a speed of 2900 r / min for 13 min. Let it stand for 8 h, then filter and wash the precipitate 5 times with deionized water. After drying at 99 °C for 13 h, grind it and sieve it through a 400-mesh sieve to obtain a synergist;

[0059] S5: Calcinate 90 g of halloysite nanotubes at 345 °C for 2.3 h and then cool to 30 °C. Then add them to 125 g of 1 mol / L hydrochloric acid solution and perform ultrasonic treatment at a power of 350 W and a frequency of 39 kHz for 35 min. After filtration, wash the precipitate 4 times with deionized water, and then vacuum dry it at 80 °C for 14 h to obtain pretreated halloysite nanotubes;

[0060] S6: Mix uniformly 1.9 g of silane coupling agent KH550 with 102.5 g of absolute ethanol, then adjust the pH to 5.5 with acetic acid. After reacting for 48 min, add 12.5 g of the pretreated halloysite nanotubes and stir and react at 590 r / min at 70 °C for 4.2 h. After centrifugal separation, wash it 4 times with absolute ethanol, and then vacuum dry it at 80 °C for 13 h to obtain modified halloysite nanotubes;

[0061] S7: Mix 11 g of modified halloysite nanotubes with 33 g of hydroxyl-terminated polydimethylsiloxane and ball-mill at 400 r / min for 5.5 h. Then add 0.45 g of aziridine crosslinking agent and crosslink at 60 °C for 2.1 h. After filtration, wash with deionized water 5 times, then add to 200 g of absolute ethanol and conduct high-pressure homogenization treatment at 105 MPa for 2 min each time for 3 times. Finally, vacuum dry at 60 °C for 22 h and pass through a 200-mesh sieve to obtain the sound insulation filler;

[0062] S8: Mix 1.5 g of antioxidant 1010 and 1.5 g of antioxidant 168 evenly to obtain the antioxidant;

[0063] S9: Add 6 g of cold-resistant toughening agent, 10 g of synergist, 9 g of sound insulation filler, and 0.4 g of antioxidant to 100 g of high-density polyethylene. Stir at 350 r / min for 5 min and then feed into the extruder. After being compressed, plasticized by the screw and continuously extruded through the die, it is loaded into a sizing sleeve at 20 °C for cooling. After cooling to 30 °C, perform fixed-length cutting to obtain the super-strong soundproof building drain pipe.

[0064] Example 3: A preparation method of a super-strong soundproof building drain pipe is as follows:

[0065] S1: Add 30 g of polyamino polyether methylene phosphonic acid and 0.5 g of sodium dodecyl sulfate to 30 mL of deionized water, and stir at 60 °C at 350 r / min for 25 min to obtain an organic dispersion;

[0066] S2: Add 7.2 g of sodium molybdate dihydrate to 300 mL of deionized water and perform ultrasonic dispersion at a power of 400 W and a frequency of 40 kHz for 10 min to obtain a sodium molybdate solution;

[0067] S3: Dissolve 9 g of zinc nitrate hexahydrate, 30.6 g of magnesium nitrate hexahydrate, and 2 g of citric acid in 300 mL of deionized water. Then, while stirring at 80 °C, drop 307.2 g of the sodium molybdate solution at a rate of 5 mL / min. After stirring for 40 min, while stirring at 90 °C, adjust the pH to 11 with 2 mol / L sodium hydroxide solution, continue stirring for 2 h, then add 3 g of stearic acid and stir at 80 °C for 40 min. After cooling to 30 °C, centrifuge at 7000 r / min for 10 min. Wash the separated precipitate with deionized water 5 times, then wash with 0.1 mol / L ammonium bicarbonate aqueous solution 2 times, and finally dry at 80 °C for 24 h to obtain the composite particles;

[0068] S4: Dissolve 12 g of composite particles in 48 mL of deionized water, then add 60 g of organic dispersion and stir at 400 r / min for 40 min. Then add 120 g of 10% sodium hydroxide solution and centrifuge at 3000 r / min for 15 min. Let it stand for 9 h, then filter and wash the precipitate with deionized water 6 times. After drying at 100 °C for 14 h, grind it and sieve it through a 400-mesh sieve to obtain the synergist;

[0069] S5: Calcinate 100 g of halloysite nanotubes at 350 °C for 2.5 h, then cool to 35 °C. Then add them to 150 g of hydrochloric acid solution with a concentration of 1 mol / L and perform ultrasonic treatment at a power of 400 W and a frequency of 40 kHz for 40 min. Filter and wash the precipitate with deionized water 5 times, and then vacuum dry at 82 °C for 15 h to obtain pretreated halloysite nanotubes;

[0070] S6: Mix 2.3 g of silane coupling agent KH550 with 125 g of absolute ethanol evenly, then adjust the pH to 6 with acetic acid. After reacting for 50 min, add 15 g of pretreated halloysite nanotubes and stir and react at 600 r / min at 72 °C for 4.5 h. After centrifugal separation, wash with absolute ethanol 5 times, and then vacuum dry at 82 °C for 15 h to obtain modified halloysite nanotubes;

[0071] S7: Mix 12 g of modified halloysite nanotubes with 36 g of hydroxyl-terminated polydimethylsiloxane and ball mill at 400 r / min for 6 h. Then add 0.5 g of aziridine crosslinking agent and crosslink at 62 °C for 2.2 h. Filter and wash with deionized water 6 times, then add to 240 g of absolute ethanol and perform high-pressure homogenization treatment at 110 MPa for 3 min each time for 3 times. Finally, vacuum dry at 62 °C for 24 h and sieve through a 200-mesh sieve to obtain the sound insulation filler;

[0072] S8: Mix 2 g of antioxidant 1010 and 2 g of antioxidant 168 evenly to obtain the antioxidant;

[0073] S9: Add 7 g of cold-resistant toughening agent, 12 g of synergist, 10 g of sound insulation filler, and 0.5 g of antioxidant to 100 g of high-density polyethylene. Stir at 400 r / min for 6 min, then feed it into the extruder. After being compressed, plasticized by the screw and continuously extruded through the die, it is loaded into a sizing sleeve at 22 °C for cooling. After cooling to 35 °C, perform fixed-length cutting to obtain the super-strong soundproof building drainage pipe.

[0074] Comparative Example 1:

[0075] Compared with Example 1, this comparative example only did not add "0.4 g of sodium dodecyl sulfate" during the preparation of the organic dispersion in S1, and the remaining steps and parameters are the same. This comparative example will not be repeated here. Finally, a super-strong soundproof building drainage pipe is obtained.

[0076] Comparative Example 2:

[0077] This comparative example is the same as Example 1 except that "1 g of citric acid" was not added during the preparation of the composite particles in S3. The remaining steps and parameters are the same, and this comparative example will not be repeated here. Finally, an ultra-silent building drainage pipe was obtained.

[0078] Comparative Example 3:

[0079] This comparative example is the same as Example 1 except that "50 g of organic dispersion liquid" was not added during the preparation of the synergist in S4. The remaining steps and parameters are the same, and this comparative example will not be repeated here. Finally, an ultra-silent building drainage pipe was obtained.

[0080] Comparative Example 4:

[0081] This comparative example is the same as Example 1 except that "10 g of pretreated halloysite nanotubes" added during the preparation of the modified halloysite nanotubes in S6 was replaced with "10 g of halloysite nanotubes". The remaining steps and parameters are the same, and this comparative example will not be repeated here. Finally, an ultra-silent building drainage pipe was obtained.

[0082] Comparative Example 5:

[0083] This comparative example is the same as Example 1 except that "0.4 g of aziridine crosslinking agent" was not added during the preparation of the sound insulation filler in S7. The remaining steps and parameters are the same, and this comparative example will not be repeated here. Finally, an ultra-silent building drainage pipe was obtained.

[0084] Comparative Example 6:

[0085] This comparative example is the same as Example 1 except that "5 g of cold-resistant toughening agent" was not added during the preparation of the ultra-silent building drainage pipe in S9. The remaining steps and parameters are the same, and this comparative example will not be repeated here. Finally, an ultra-silent building drainage pipe was obtained.

[0086] Comparative Example 7:

[0087] This comparative example is the same as Example 1 except that "8 g of synergist" was not added during the preparation of the ultra-silent building drainage pipe in S9. The remaining steps and parameters are the same, and this comparative example will not be repeated here. Finally, an ultra-silent building drainage pipe was obtained.

[0088] Comparative Example 8:

[0089] This comparative example is the same as Example 1 except that "8 g of sound insulation filler" was not added during the preparation of the ultra-silent building drainage pipe in S9. The remaining steps and parameters are the same, and this comparative example will not be repeated here. Finally, an ultra-silent building drainage pipe was obtained.

[0090] Comparative Example 9:

[0091] This comparative example is the same as Example 1 except that in the preparation process of the super-silent building drainage pipe of S9, "0.3 g of antioxidant" is replaced with "0.3 g of antioxidant 1010", and the remaining steps and parameters are the same. This comparative example will not be repeated here, and finally a super-silent building drainage pipe is obtained.

[0092] Performance testing:

[0093] Determination of sound insulation ability:

[0094] Referring to the standard of CJ / T 312-2009 "Test Method for Noise of Building Drainage Pipe System", simulating the drainage condition, the flowing water noise attenuation value (dB) of the super-silent building drainage pipes prepared in Examples 1-3 and Comparative Examples 1-9 is measured when the drainage flow rate is 1 L / s to reflect the sound insulation ability of the drainage pipes. The test results are shown in Table 1.

[0095] Determination of oxygen index:

[0096] Referring to the standard of GB / T 2406.2-2009 "Plastics - Determination of flammability by oxygen index - Part 2: Ambient temperature test", the oxygen index (%) of the super-silent building drainage pipe materials prepared in Examples 1-3 and Comparative Examples 1-9 is determined by using a JF-5 intelligent oxygen index tester (JYW-74, Motis Combustion Technology Co., Ltd.). The test results are shown in Table 1.

[0097] Determination of smoke suppression ability:

[0098] Referring to the standard of GB / T 8323.2-2008 "Plastics - Smoke generation - Part 2: Determination of the smoke density by a single-chamber test method", cut the pipe materials with a size of 100 mm × 100 mm × 4 mm, and then use a smoke density tester (JYH-90, FTT, UK) to measure the maximum specific optical density (cm) of the super-silent building drainage pipes prepared in Examples 1-3 and Comparative Examples 1-9 within 4 min under the conditions of 25 kW / m 2 irradiated with flame and without flame to reflect the smoke suppression ability of the pipe materials. The test results are shown in Table 1.

[0099] Determination of impact strength:

[0100] Referring to the standard of GB / T 1043.1-2019 "Plastics - Determination of Charpy impact properties - Part 1: Non-instrumented impact test", cut the non-notch pipe materials with a size of 80 mm × 10 mm × 4 mm, and respectively determine the impact strength (KJ·m -2 ) at this temperature after storing at 25 °C and -30 °C for 12 h. According to this method, the impact strength (KJ·m-2 ), and the test results are shown in Table 1.

[0101] Table 1: Performance test results of Examples 1 - 3 and Comparative Examples 1 - 9

[0102]

[0103] Data analysis:

[0104] As can be seen from Table 1, the super - quiet building drain pipe prepared in the embodiment of the present invention has excellent sound insulation ability, flame retardant ability, smoke suppression ability, and impact resistance.

[0105] The above has described a detailed description of an embodiment of the present invention, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A super-silent building drain pipe, characterized in that, It comprises the following raw materials in parts by mass: 100 parts of high-density polyethylene, 5 - 7 parts of cold-resistant toughening agent, 8 - 12 parts of synergist, 8 - 10 parts of sound insulation filler, and 0.3 - 0.5 part of antioxidant; The preparation method of the synergist is as follows: A1: Add polyamino polyether methylene phosphonic acid and sodium dodecyl sulfate to deionized water, and stir at 50 - 60 °C for 15 - 25 min to obtain an organic dispersion; A2: Add sodium molybdate dihydrate to deionized water and perform ultrasonic dispersion for 8 - 10 min to obtain a sodium molybdate solution; A3: Dissolve zinc nitrate hexahydrate, magnesium nitrate hexahydrate, and citric acid in deionized water, then dropwise add the sodium molybdate solution while stirring at 50 - 80 °C. After stirring for 30 - 40 min, adjust the pH to 9 - 11 while stirring at 60 - 90 °C. After stirring for 1 - 2 h, add stearic acid and stir at 75 - 80 °C for 30 - 40 min. Cool to 25 - 30 °C and then centrifuge for 8 - 10 min. The separated precipitate is washed and dried to obtain composite particles; A4: Dissolve the composite particles in deionized water, then add the organic dispersion and stir for 30 - 40 min. Then add sodium hydroxide solution and centrifuge for 10 - 15 min. Let it stand for 7 - 9 h, then filter and wash, dry, grind, and screen the precipitate to obtain the synergist.

2. The super silent building drain pipe according to claim 1, characterized in that, The mass ratio of polyamino polyether methylene phosphonic acid, sodium dodecyl sulfate, and deionized water in A1 is 25 - 30: 0.4 - 0.5: 25 - 30; The mass ratio of deionized water and sodium molybdate dihydrate in A2 is 200 - 300: 2.4 - 7.

2.

3. The super-silent building drain pipe according to claim 1, characterized in that The mass ratio of zinc nitrate hexahydrate, magnesium nitrate hexahydrate, citric acid, deionized water, sodium molybdate solution, and stearic acid in A3 is 3 - 9: 5.1 - 30.6: 1 - 2: 200 - 300: 202.4 - 307.2: 1 - 3; The mass ratio of composite particles, deionized water, organic dispersion, and sodium hydroxide solution in A4 is 10 - 12: 40 - 48: 50 - 60: 100 - 120; The mass fraction of the sodium hydroxide solution in A4 is 10%.

4. The super silent building drain pipe according to claim 1, characterized in that, The preparation method of the sound insulation filler is as follows: B1: Calcinate halloysite nanotubes at 340 - 350 °C for 2 - 2.5 h, then cool to 25 - 35 °C, and then add them to hydrochloric acid solution and perform ultrasonic treatment for 30 - 40 min. After filtration, wash and vacuum dry the precipitate to obtain pretreated halloysite nanotubes; B2: Mix silane coupling agent KH550 and absolute ethanol evenly, then adjust the pH to 5 - 6, react for 45 - 50 min, then add the pretreated halloysite nanotubes and stir at 68 - 72 °C for 4 - 4.5 h. After centrifugal separation, wash and vacuum dry the precipitate to obtain modified halloysite nanotubes; B3: Mix the modified halloysite nanotubes with hydroxyl-terminated polydimethylsiloxane and ball mill for 5 - 6 h. Then add the aziridine crosslinking agent and crosslink at 58 - 62 °C for 2 - 2.2 h. Filter, wash the precipitate first, then add it to anhydrous ethanol and perform high-pressure homogenization treatment. Finally, perform vacuum drying and sieving treatment to obtain the sound insulation filler.

5. The super silent building drain pipe according to claim 4, characterized in that, The mass ratio of the halloysite nanotubes to the hydrochloric acid solution described in B1 is 80 - 100:100 - 150; The concentration of the hydrochloric acid solution described in B1 is 1 mol / L.

6. The super silent building drainage pipe according to claim 4, characterized in that The mass ratio of the silane coupling agent KH550, anhydrous ethanol, and pretreated halloysite nanotubes described in B2 is 1.5 - 2.3:80 - 125:10 - 15.

7. The super silent building drain pipe according to claim 4, characterized in that, The mass ratio of the modified halloysite nanotubes, hydroxyl-terminated polydimethylsiloxane, aziridine crosslinking agent, and anhydrous ethanol described in B3 is 10 - 12:30 - 36:0.4 - 0.5:160 - 240.

8. The super silent building drain pipe according to claim 1, wherein The preparation method of the antioxidant is as follows: Mix antioxidant 1010 and antioxidant 168 evenly to obtain the antioxidant; The mass ratio of antioxidant 1010 to antioxidant 168 is 1 - 2:1 - 2.

9. A method for preparing the super silent building drain pipe according to any one of claims 1-8, characterized in that, It includes the following steps: Add the cold-resistant toughening agent, synergist, sound insulation filler, and antioxidant to high-density polyethylene, stir for 4 - 6 min, then feed it into the extruder. After being compressed, plasticized by the screw, and continuously extruded through the die, it is loaded into a sizing sleeve at 18 - 22 °C for cooling. After cooling to 25 - 35 °C, perform fixed-length cutting to obtain the super-strong silent building drainage pipe.

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