CN111393777A - Formula and forming technology of PVC-C alloy material for clean and antibacterial direct drinking water household branch pipeline - Google Patents
Formula and forming technology of PVC-C alloy material for clean and antibacterial direct drinking water household branch pipeline Download PDFInfo
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- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/22—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers modified by chemical after-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/7461—Combinations of dissimilar mixers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2791/00—Shaping characteristics in general
- B29C2791/004—Shaping under special conditions
- B29C2791/006—Using vacuum
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
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- B29C2948/92504—Controlled parameter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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Abstract
The invention discloses a PVC-C alloy material formula for a clean bacteriostatic direct drinking water household branch pipeline and a forming technology, wherein the formula comprises the following components in parts by weight: 85-92 parts of PVC-C resin, 8-15 parts of interpenetrating network copolymer formed by grafting slightly chlorinated HDPE and acrylate, 0.3-0.8 part of organic silicon dispersing agent, 3-6 parts of composite stabilizer without heavy metal substances, 0.5-1.5 parts of lubricant and 2-4 parts of anti-aging agent. The raw materials and the processing aid used in the formula do not contain lead, tin and cadmium heavy metal substances, and no heavy metal substances are dissolved out in the pipeline in the using process, so that the secondary pollution of the heavy metal substances to the direct drinking water pipeline is effectively eliminated. The PVC-C alloy formula material is suitable for extruding and processing direct drinking water household branch pipes with the specifications of DN15 mm-DN 80mm, so that the bacteriostatic, cleaning, environmental, sanitary, safety and other performances of the direct drinking water household branch pipes are comprehensively improved.
Description
Technical Field
The invention relates to the technical field of drinking water pipelines, in particular to a formula and a forming technology of a PVC-C alloy material for a clean antibacterial direct drinking water household branch pipeline.
Background
As a novel drinking water mode, the pipeline direct drinking water system has the great advantages of sanitation, safety, controllability, energy conservation and environmental protection in operation, healthy and convenient drinking and the like. Therefore, the promotion of urban sanitary safe drinking water is necessary, and the promotion of high-quality healthy direct drinking water engineering is necessary. When a direct drinking water system is introduced, the operation and maintenance problems of direct drinking water need to be concerned, the problem of secondary pollution of a pipeline in the water quality conveying process is avoided, and the direct drinking water engineering is healthily and steadily developed.
Unlike the water in the main pipeline of the water supply system which is in a flowing state all the time, the domestic water consumption time period is relatively centralized, so the water in the pipeline which branches into the house is not in a flowing state all the time. Generally speaking, the longer the retention time of the water in the pipeline is, the more bacteria are easy to grow due to the still water, and the secondary pollution of the water quality of the household is brought. Therefore, in order to meet the large-scale, high-efficiency and low-cost direct drinking water conveying task, the improvement of the antibacterial performance of the household water conveying branch pipeline is more important besides the improvement of the water quality of a municipal water plant or the secondary ultrafiltration purification of water bodies entering a household.
The existing PVC-C material has high melt viscosity, the material is easy to decompose in the processing process, and the prior PVC-C pipeline processing formula often uses heavy metal salt stabilizers with high toxicity of lead and cadmium, so that the pipeline is polluted by heavy metal, and the PVC-C pipeline processing formula has the defects of environmental protection, sanitation and safety. In the material formula of the PVC-C cold and hot water pipeline, although lead and cadmium heavy metal salts with high toxicity are abandoned, organic tin stabilizers with low toxicity are used, so that the sanitary safety of the PVC-C cold and hot water pipeline is relatively improved. However, the problem of excessive use of organic tin stabilizers also exists, the environmental toxicity of part of organic tin stabilizers still has technical disputes, and people prefer to use nontoxic calcium-zinc composite salt stabilizers. However, in the processing of PVC-C materials, the common calcium-zinc salt composite stabilizer is difficult to meet the requirements of the forming processing of PVC-C materials.
Therefore, the technical problem to be solved by the technical staff in the field is how to provide a formulation and a forming technology of a PVC-C alloy material for a clean bacteriostatic direct drinking water inlet branch pipe, which can solve the above problems.
Disclosure of Invention
In view of the above, the invention provides a formula and a forming technology of a PVC-C alloy material for a clean bacteriostatic direct drinking water inlet branch pipeline, which can meet the large-scale, high-efficiency and low-cost direct drinking water conveying task and can improve the antibacterial performance of the household water conveying branch pipeline more importantly.
In order to achieve the purpose, the invention provides the following technical scheme:
a formula of a PVC-C alloy material for a clean antibacterial direct drinking water household branch pipeline is characterized by comprising the following components in parts by weight: 85-92 parts of PVC-C resin, 8-15 parts of interpenetrating network copolymer formed by grafting slightly chlorinated HDPE and acrylate, 0.3-0.8 part of organic silicon dispersing agent, 3-6 parts of composite stabilizer without heavy metal substances, 0.5-1.5 parts of lubricant and 2-4 parts of anti-aging agent.
Preferably, the PVC-C resin is PVC-C resin with chlorine content of 67-69%.
Preferably, the dispersing agent is at least 1 of powdery or liquid organosilicon additives.
Preferably, in the formula and the molding technology of the PVC-C alloy material for the clean bacteriostatic direct drinking water inlet branch pipeline, the composite stabilizer without heavy metal substances is compounded by at least 7 materials of calcium stearate, magnesium stearate, barium stearate, a glycerol zinc complex, diglycerol calcium, layered double metal (aluminum magnesium) composite hydroxide, crystalline aluminosilicate, calcium oxide, magnesium oxide, stearoylbenzoylmethane, dipentaerythritol, sorbitan monostearate, epoxidized soybean oil, triphenyl phosphite, adipic acid glyceride and 1010 antioxidant.
Preferably, the lubricant is 1-3 of solid lubricants of PE wax, OPE wax and neutral hydroxy fatty acid complex alcohol ester.
Preferably, the anti-aging agent is a composite auxiliary agent of rutile titanium dioxide and toner.
Preferably, the molding technique adopts the following working steps:
step one, premixing the composite stabilizer without the heavy metal substances uniformly according to the mixture ratio of the components by using a medium-speed mixer C1, and weighing the mixture for use after cooling;
secondly, sequentially adding PVC-C resin, the interpenetrating network copolymer formed by grafting the lightly chlorinated HDPE and the acrylic ester and the organic silicon dispersing agent into a high-low speed mixer C2, uniformly stirring at a low speed, continuously adding processing aids such as a composite stabilizer, a lubricant, an anti-aging agent and the like, uniformly mixing at a high speed, cooling to obtain PVC-C alloy resin, and storing for at least 8-24 hours for post-curing materials;
step three, extruding the PVC-C alloy resin prepared in the step two into a PVC-C pipe blank through a forming die by using a double-screw extruder J3, and rapidly feeding the pipe blank into a vacuum box to form a PVC-C alloy direct drinking water household branch pipe, wherein the nominal diameter (mm) range is as follows: DN15 mm-DN 80mm, and the wall thickness is S4-S6.3.
Preferably, the specification of the medium-speed mixer C1 is 100-150L, the rotating speed is 200-500 r/min, the premixing temperature is 45-50 ℃, the heavy metal-free composite stabilizer is uniformly premixed according to the component proportion, and the mixture is weighed after being cooled.
Preferably, the specification of the high-low speed mixer C2 is 300/500L, the hot mixing temperature is 110-120 ℃, the cold mixing temperature is 45-55 ℃, the interpenetrating network copolymer formed by grafting the PVC-C resin, the lightly chlorinated HDPE and the acrylic ester and the organic silicon dispersing agent are sequentially added, the mixture is uniformly stirred at a low speed, the stirring temperature is 40-65 ℃, the processing aids such as the composite stabilizer, the lubricant and the anti-aging agent are continuously added, the mixture is uniformly mixed at a high speed, the stirring temperature is 110-120 ℃, the mixture is cooled to 45-55 ℃, the PVC-C alloy resin is prepared, and the PVC-C alloy resin is stored for post-curing for at least 8-24 hours.
Preferably, the double-screw extruder J3 is a 045-cone double-extruder, the double screws are provided with a heat-conducting oil cooling system, the middle forming parts of a neck mold and a core rod of the forming mold M4 are of an inner curved surface pressurizing structure, the radial ratio of the inner curved surface is 1.05-1.15, the length-diameter ratio is 1.5-2.5, and the maximum vacuum adsorption force of a vacuum box Y5 is not lower than 0.06 MPa; the prepared PVC-C alloy resin is extruded into a PVC-C pipe blank through a forming die, and the pipe blank is rapidly put into a vacuum box to be formed into a PVC-C alloy direct drinking water household branch pipe, wherein the extrusion temperature of the PVC-C alloy pipe blank is 145-205 ℃, the pressure of a forming die is controlled at 20-27 Mpa, and the vacuum of a main machine of the extruder is more than or equal to 0.08 MP.
Preferably, the size and physical properties of the sampling and measuring pipeline of the clean bacteriostatic direct drinking water household branch pipeline meet the requirements of relevant standards.
According to the technical scheme, compared with the prior art, the invention has the following characteristics:
(1) the used raw materials and processing aids do not contain lead, tin and cadmium heavy metal substances, and no heavy metal substances are dissolved out in the pipeline in the using process, so that the secondary pollution of the heavy metal substances to the direct drinking water pipeline is effectively eliminated;
(2) the direct drinking water household branch pipe is suitable for extruding and processing direct drinking water household branch pipes with the specifications of DN15 mm-DN 80mm, so that the bacteriostatic, cleaning, environmental, sanitary, safety and other performances of the direct drinking water household branch pipe are comprehensively improved;
(3) the PVC-C has unique capacity of inhibiting the growth of bacteria, can not provide nutrients required by the bacteria, and can effectively inhibit the propagation speed of pathogenic bacteria in a water body. The growth rate of bacteria in the PVC-C pipeline is PP-R pipe 1/45, PE-X pipe 1/60, copper pipe 1/6 and steel pipe 1/4, so that secondary pollution to water quality in the pipeline system can not be caused, and the PVC-C pipeline is an excellent pipeline for conveying domestic cold and hot water and direct drinking water;
(4) the interpenetrating network copolymer formed by grafting the lightly chlorinated HDPE and the acrylate has unique flexible elastic function and good fluidity, is the same as the PVC-C material in polarity, and has excellent compatibility between the two materials;
(5) the antibacterial, clean, environmental, sanitary and safety performance of the pipeline is met, and the performances of the pipeline in the aspects of water pressure resistant strength, impact resistant toughness, heat resistant Vicat softening degree and the like are comprehensively guaranteed;
(6) calcium salt, zinc salt, aluminum salt, magnesium salt and fatty acid ester environment-friendly sanitary materials are selected to be compounded with the stabilizer. The composite stabilizer does not contain lead, tin and cadmium heavy metal substances, and eliminates the pollution of the heavy metal substances to the PVC-C (alloy) material. The composite stabilizer effectively blocks and delays the decomposition rate of the PVC-C melt material in the processing process by means of inhibition, complexation, neutralization, adsorption and the like, and a stable product forming period is obtained. Meanwhile, the improvement of the fluidity of the PVC-C melt is emphasized in the use of alloy materials, anti-aging agents and lubricants, and the PVC-C (alloy) clean bacteriostatic direct drinking water inlet branch pipeline with the specification of DN15 mm-DN 80mm is suitable for extrusion processing;
(7) the invention has unique capability of inhibiting bacteria growth, smooth inner and outer walls of the pipeline and a friction coefficient of 150, can greatly reduce the accumulation of trace impurities in water and the opportunity of fungus algae adhesion and breeding, so that the clean bacteriostatic direct drinking water of PVC-C alloy is comprehensively promoted and improved in the aspects of cleanness, bacteriostasis, environment, sanitation, safety and the like, and the water quality of branches entering the household is cleaner, safer and more sanitary.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the formula comprises the following components in parts by mass: 87.5 parts of PVC-C resin, 12.5 parts of interpenetrating network copolymer formed by grafting of lightly chlorinated HDPE and acrylic ester, 0.5 part of organic silicon dispersing agent, 4.8 parts of composite stabilizer without heavy metal substances, 1.2 parts of lubricant and 2.7 parts of anti-aging agent;
the forming process adopts the following operation steps:
step one, premixing the composite stabilizer without the heavy metal substances uniformly according to the mixture ratio of the components by using a medium-speed mixer C1, and weighing the mixture for use after cooling;
secondly, sequentially adding PVC-C resin, the interpenetrating network copolymer formed by grafting the lightly chlorinated HDPE and the acrylic ester and the organic silicon dispersing agent into a high-low speed mixer C2, uniformly stirring at a low speed, continuously adding processing aids such as a composite stabilizer, a lubricant, an anti-aging agent and the like, uniformly mixing at a high speed, cooling to obtain PVC-C alloy resin, and storing for 16 hours for post-curing materials;
step three, extruding the PVC-C alloy resin prepared in the step two into a PVC-C pipe blank by a double-screw extruder J3 through a forming die, rapidly feeding the pipe blank into a vacuum box to form a PVC-C alloy direct drinking water household branch pipe with DN20mm, wherein the nominal diameter is DN20mm, and the average outer diameter of the pipe is standard: 20.05-20.3 mm, standard wall thickness: 2.3-2.8 mm; the indexes of the sampling measurement pipeline such as size, physical property, water quality, bacteriostatic ability and the like are shown in the following table, and the result meets the requirements of relevant standards;
wherein the PVC-C resin is extrusion grade PVC-C resin with chlorine content of 67.3 percent;
an interpenetrating network copolymer ACM-P1 formed by grafting slightly chlorinated HDPE and acrylate;
the dispersing agent is a powdery organic silicon additive Tegomer E525;
the composite stabilizer without heavy metal substances is compounded by 9 materials of calcium stearate, magnesium stearate, a glycerol zinc complex, layered double metal (aluminum magnesium) composite hydroxide, crystalline aluminosilicate, calcium oxide, stearoylbenzoylmethane, dipentaerythritol and 1010 antioxidant;
the lubricant is a solid lubricant G12 of PE wax, OPE wax and neutral hydroxy fatty acid complex alcohol ester;
the anti-aging agent is a composite auxiliary agent of rutile titanium dioxide and toner;
the medium-speed mixer C1 is 100L in specification, the rotating speed is 350r/min, the premixing temperature is 50 ℃, the compound stabilizer without the heavy metal substances is uniformly premixed according to the component proportion, and the mixture is weighed and used as required after being cooled;
the specification of a high-low speed mixer C2 is 300/500L and 300/500L, the hot mixing temperature is 112 ℃, the cold mixing temperature is 48 ℃, PVC-C resin, interpenetrating network copolymer formed by grafting of slightly chlorinated HDPE and acrylic ester and organic silicon dispersing agent are sequentially added and uniformly stirred at a low speed, the stirring temperature reaches 55 ℃, processing aids such as composite stabilizer, lubricant and anti-aging agent are continuously added, the PVC-C alloy resin is prepared after the high-speed mixing is uniformly carried out, the stirring temperature reaches 112 ℃, the cooling is carried out to 48 ℃, and the material is cured after being stored for 16 hours in a sealed manner.
Twin-screw extruder J3 is a 045 cone twin-extruder, twin-screw mounted heat-conducting oil cooling system. The middle forming part of the neck mold and the core rod of the DN20mm forming mold M4 is of an inner curved surface pressurizing structure, the radial ratio of the inner curved surface is 1.05, the length-diameter ratio is 1.8, and the vacuum adsorption force of a vacuum box Y5 is 0.06 MPa. The prepared PVC-C alloy resin is extruded into a PVC-C pipe blank through a forming die, and the pipe blank is quickly put into a vacuum box to be formed into a PVC-C (alloy) direct drinking water household branch pipe with DN20 mm. The extrusion temperature of the PVC-C alloy pipe blank is 145-205 ℃, the pressure of a forming die is controlled at 23-24 Mpa, and the vacuum of a main machine of the extruder is 0.09 Mpa.
DN20mm PVC-C alloy clean bacteriostatic direct drinking water household branch pipe physical property test results (as shown in the following table).
DN20mm PVC-C (alloy) novel clean bacteriostatic direct drinking water household branch pipe water quality test results (as shown in the following table).
DN20mm PVC-C (alloy) novel clean bacteriostatic direct drinking water household branch pipe bacteriostatic test results (as shown in the following table).
From the above table, it can be seen that: the invention can improve the performance of bacteriostasis, cleanness, environment, sanitation, safety and the like.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A formula of a PVC-C alloy material for a clean antibacterial direct drinking water household branch pipeline is characterized by comprising the following components in parts by weight: 85-92 parts of PVC-C resin, 8-15 parts of interpenetrating network copolymer formed by grafting slightly chlorinated HDPE and acrylate, 0.3-0.8 part of organic silicon dispersing agent, 3-6 parts of composite stabilizer without heavy metal substances, 0.5-1.5 parts of lubricant and 2-4 parts of anti-aging agent.
2. The formula of the PVC-C alloy material for the clean bacteriostatic direct drinking water household branch pipe according to claim 1, wherein the PVC-C resin is PVC-C resin with chlorine content of 67-69%.
3. The PVC-C alloy material formula for the clean bacteriostatic direct drinking water household branch pipeline according to claim 1, wherein the dispersing agent is at least 1 of powdery or liquid organosilicon additives.
4. The PVC-C alloy material formula for the clean and bacteriostatic direct drinking water household branch pipe according to claim 1, wherein the compound stabilizer without heavy metal substances is at least 7 of calcium stearate, magnesium stearate, barium stearate, zinc glycerolate complex, diglycerol calcium, layered double metal (aluminum magnesium) composite hydroxide, crystalline aluminosilicate, calcium oxide, magnesium oxide, stearoylbenzoylmethane, dipentaerythritol, sorbitan monostearate, epoxidized soybean oil, triphenyl phosphite, adipic acid glyceride and 1010 antioxidant.
5. The formula of the PVC-C alloy material for the clean bacteriostatic direct drinking water household branch pipeline according to claim 1, wherein the lubricant is 1-3 of solid lubricants of PE wax, OPE wax and neutral hydroxy fatty acid complex alcohol ester.
6. The PVC-C alloy material formula for the clean and bacteriostatic direct drinking water inlet and branch pipelines according to claim 1, wherein the anti-aging agent is a composite auxiliary agent of rutile titanium dioxide and toner.
7. A forming technology of a PVC-C alloy material formula for a clean bacteriostatic direct drinking water household branch pipeline is characterized by comprising the following operation steps:
step one, premixing the composite stabilizer without the heavy metal substances uniformly according to the mixture ratio of the components by using a medium-speed mixer C1, and weighing the mixture for use after cooling;
secondly, sequentially adding PVC-C resin, the interpenetrating network copolymer formed by grafting the lightly chlorinated HDPE and the acrylic ester and the organic silicon dispersing agent into a high-low speed mixer C2, uniformly stirring at a low speed, continuously adding processing aids such as a composite stabilizer, a lubricant, an anti-aging agent and the like, uniformly mixing at a high speed, cooling to obtain PVC-C alloy resin, and storing for at least 8-24 hours for post-curing materials;
step three, extruding the PVC-C alloy resin prepared in the step two into a PVC-C pipe blank through a forming die by using a double-screw extruder J3, and rapidly feeding the pipe blank into a vacuum box to form a PVC-C alloy direct drinking water household branch pipe, wherein the nominal diameter (mm) range is as follows: DN15 mm-DN 80mm, and the wall thickness is S4-S6.3.
8. The forming technology of the PVC-C alloy material formula for the clean bacteriostatic direct drinking water household branch pipeline according to claim 7 is characterized in that the specification of the medium-speed mixer C1 is 100-150L, the rotating speed is 200-500 r/min, the premixing temperature is 45-50 ℃, the heavy metal-free composite stabilizer is uniformly premixed according to the component proportion, and the mixture is weighed according to the requirement after being cooled.
9. The forming technology of the PVC-C alloy material formula for the clean bacteriostatic direct drinking water inlet branch pipeline according to claim 7 is characterized in that the specification of the high-low speed mixer C2 is 300/500L, the hot mixing temperature is 110-120 ℃, the cold mixing temperature is 45-55 ℃, the interpenetrating network copolymer formed by grafting PVC-C resin, slightly chlorinated HDPE and acrylate and the organic silicon dispersing agent are sequentially added and uniformly stirred at a low speed, the stirring temperature is 40-65 ℃, the processing aids such as the composite stabilizer, the lubricant, the anti-aging agent and the like are continuously added, the PVC-C alloy resin is uniformly mixed at a high speed, the stirring temperature is 110-120 ℃, the PVC-C alloy resin is prepared after cooling to 45-55 ℃, and the PVC-C alloy resin is stored for at least 8-24 hours and is used for post-curing materials.
10. The forming technology of the PVC-C alloy material formula for the clean bacteriostatic direct drinking water household branch pipeline according to claim 7, characterized in that the double-screw extruder J3 is a 045-cone double extruder, the double screws are provided with a heat-conducting oil cooling system, the middle forming part of a neck mold and a core rod of a forming mold M4 is of an inner curved surface pressurizing structure, the radial ratio of the inner curved surface is 1.05-1.15, the length-diameter ratio is 1.5-2.5, and the vacuum maximum adsorption force of a vacuum box Y5 is not lower than 0.06 MPa; the prepared PVC-C alloy resin is extruded into a PVC-C pipe blank through a forming die, and the pipe blank is rapidly put into a vacuum box to be formed into a PVC-C alloy direct drinking water household branch pipe, wherein the extrusion temperature of the PVC-C alloy pipe blank is 145-205 ℃, the pressure of a forming die is controlled at 20-27 Mpa, and the vacuum of a main machine of the extruder is more than or equal to 0.08 MP.
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