CN110922692B - Fast-forming PVC-U pipe and preparation method thereof - Google Patents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- 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
- C08L27/02—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 not modified by chemical after-treatment
- C08L27/04—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 not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention discloses a fast-forming PVC-U pipe and a preparation method thereof, wherein the raw materials for preparing the fast-forming PVC-U pipe comprise the following components in parts by weight: 100 parts of polyvinyl chloride resin, 12-18 parts of modified EVA, 5-18 parts of chlorinated polyethylene, 6-12 parts of plasticizer, 2-6 parts of potassium titanate whisker, 0.1-0.5 part of antioxidant, 2.5-4.0 parts of heat stabilizer, 0.8-1.6 parts of calcium stearate and 1.5-2.5 parts of stearic acid. The fast-forming PVC-U pipe prepared by the invention has excellent thermal stability and impact resistance, small cohesiveness with equipment in the processing process, easy fast processing and forming, simple preparation method, easy operation of preparation process and good economic benefit.
Description
Technical Field
The invention relates to the technical field of plastic pipes, in particular to a fast-forming PVC-U pipe and a preparation method thereof.
Background
The PVC-U pipe is also called hard PVC, and is prepared with PVC resin as main material and proper amount of stabilizer, lubricant, stuffing, plasticizer, etc. and through extrusion in a plastic extruder or injection in an injection molding machine. PVC-U pipe is used as plastic product for building, its development speed is very fast, especially in some developed countries, its total consumption has already accounted for 80% -90% of plastic pipe, but the melt viscosity of PVC-U pipe is high, the mobility is bad, the forming temperature of resin is close to the pyrolysis temperature, the temperature range that can carry on the shaping is very narrow, difficult to shape.
Chinese patent CN109721881A discloses a green environment-friendly low-temperature impact-resistant PVC-U electrical casing, which comprises the following components in parts by mass: 90-110 parts of PVC resin, 4-6 parts of calcium-zinc composite stabilizer, 6-10 parts of AMB resin, 0.1-1 part of PE wax, 0.1-1 part of stearic acid, 10-30 parts of inorganic filler, 2-4 parts of processing modification auxiliary agent and 2-3 parts of titanium dioxide. The patent adopts a calcium-zinc stabilizer to replace the traditional lead salt stabilizing system and adds toughening modified terpolymer resin (AMB resin). However, the PVC-U electrical casing prepared by the patent has poor processing formability.
Chinese patent CN109422954A discloses a carbon fiber ball modified composite material for rapid molding, which is composed of the following raw materials: 100 parts of resin matrix, 10-50 parts of carbon fiber balls, 1-9 parts of toughening agent, 0.2-1 part of compatilizer, 1-3 parts of heat-resistant agent, 0.05-0.25 part of antioxidant and 0.05-0.45 part of lubricant. However, the carbon fiber ball modified composite material prepared by the patent for rapid prototyping has poor impact resistance.
Disclosure of Invention
Aiming at the problems, the invention provides a fast-forming PVC-U pipe and a preparation method thereof.
The technical scheme adopted by the invention for solving the problems is as follows: the quick-forming PVC-U pipe comprises the following raw materials in parts by weight: 100 parts of polyvinyl chloride resin, 12-18 parts of modified EVA, 5-18 parts of chlorinated polyethylene, 6-12 parts of plasticizer, 2-6 parts of potassium titanate whisker, 0.1-0.5 part of antioxidant, 2.5-4.0 parts of heat stabilizer, 0.8-1.6 parts of calcium stearate and 1.5-2.5 parts of stearic acid; the antioxidant is selected from one or at least two of triisodecyl phosphite, antioxidant 1010 and antioxidant 300; the heat stabilizer is prepared by mixing barium ricinoleate, zinc anthranilate and epoxidized soybean oil in a weight ratio of 2:1: 1.
The potassium titanate whisker can supplement and fill the gap of the master batch, so that the strength of the polyvinyl chloride material is uniform; the chlorinated polyethylene is a high polymer material prepared by high-density polyethylene through chlorination substitution reaction, has excellent weather resistance, chemical resistance and aging resistance, has good compatibility with polyvinyl chloride, has higher decomposition temperature, can improve the high-temperature formability of the material and enhance the forming effect when being added into the polyvinyl chloride, and can also be used as an excellent impact modifier for PVC plastics to improve the impact resistance of PVC-U pipes.
Further, the antioxidant is selected from triisodecyl phosphite, antioxidant 1010 and antioxidant 300 mixed in a weight ratio of 1:0.5: 1.2.
Further, the plasticizer is selected from at least two of dioctyl isophthalate, dioctyl adipate, diphenyl isooctyl phosphate and epoxy octyl stearate.
Furthermore, the plasticizer is dioctyl adipate, diphenyl isooctyl phosphate and epoxy octyl stearate in a weight ratio of 1: 2-4: 0.5-1.2.
Further, the preparation method of the modified EVA comprises the following steps: adding 10 parts of EVA, 1.2-2.5 parts of pretreated calcium carbonate, 0.2-0.5 part of ethylene/octene copolymer and 0.15-0.35 part of lubricating dispersant into a high-speed mixer for high-speed stirring, heating to 85 ℃ at the heating rate of 2 ℃/min, and keeping the temperature for 3 minutes to obtain the modified EVA.
The modified EVA prepared by mixing calcium carbonate in the EVA has good intermiscibility with the polyvinyl chloride, can improve the processability of the polyvinyl chloride, and enhances the plasticity, toughness and elasticity of the plastic.
Further, the preparation method of the pretreated calcium carbonate comprises the following steps: the calcium carbonate is put into an oven with the temperature of 95 ℃ for drying for 2 hours, put into a high-speed mixer, added with a silane coupling agent KH-550 and mixed for 5 minutes at high speed. Calcium carbonate belongs to inorganic materials, EVA belongs to organic polymers, the interfacial surface tension of the blend of the calcium carbonate and the EVA is large and is incompatible with each other, and the compatibility of the calcium carbonate and an organic polymer material interfacial layer can be improved and the impact strength and the tensile property of the material can be improved by blending the calcium carbonate and a silane coupling agent.
Furthermore, the addition amount of the silane coupling agent KH-550 is 0.7-1.0 percent of the weight of the calcium carbonate.
Further, the raw materials for preparing the fast-forming PVC-U pipe comprise the following components in parts by weight: 100 parts of polyvinyl chloride resin, 15 parts of modified EVA, 11.5 parts of chlorinated polyethylene, 9 parts of plasticizer, 4 parts of potassium titanate whisker, 0.3 part of antioxidant, 3.2 parts of heat stabilizer, 1.2 parts of calcium stearate and 2.0 parts of stearic acid.
The invention also aims to provide a preparation method of the fast-forming PVC-U pipe, which comprises the following steps:
step S10, weighing the raw materials for preparing the rapidly molded PVC-U pipe according to the weight parts;
step S20, mixing the polyvinyl chloride resin, the modified EVA, the chlorinated polyethylene, the plasticizer, the potassium titanate whisker, the antioxidant, the heat stabilizer, the calcium stearate and the stearic acid in parts by weight, and placing the mixture in a high-speed mixer for dispersing for 10 to 25 minutes to obtain a premix;
and S30, putting the premix obtained in the step S20 into a double-screw extruder for extrusion molding to obtain the rapidly molded PVC-U pipe.
Further, in step S30, the extrusion temperature of the twin-screw extruder is 165 ℃ to 195 ℃.
The invention has the advantages that:
(1) the PVC-U pipe prepared by the invention has strong interface bonding property between the polyvinyl chloride resin and the modified EVA, can improve the processing property of the polyvinyl chloride, enhances the plasticity, toughness and elasticity of plastics, can effectively improve the anti-damage capability of the pipe, and greatly improves the mechanical property;
(2) the potassium titanate whisker is added into the rapidly molded PVC-U pipe prepared by the invention, so that gaps and holes caused by filling master batch in the molding process can be effectively filled, the pipe is molded more compactly, the strength of the material is more uniform, and the molding speed of the pipe is accelerated;
(3) according to the fast-forming PVC-U pipe prepared by the invention, the formula of the plasticizer and the antioxidant is added in a multi-element synergistic manner, so that the synergistic effect among the plasticizers is fully exerted, and the plasticity of the PVC pipe is greatly improved; barium ricinoleate, zinc anthranilate and epoxidized soybean oil in a specific ratio are added to serve as a composite heat stabilizer, so that the heat stability of the material is improved, the material can also play a role in lubricating with added calcium stearate and stearic acid, the flowability of the material is improved, the retention time of the material in extrusion equipment is reduced, and the extrusion rate is improved;
(4) the fast-forming PVC-U pipe prepared by the invention has excellent thermal stability and impact resistance, small cohesiveness with equipment in the processing process, easy fast processing and forming, simple preparation method, easy operation of preparation process and good economic benefit.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention is described in further detail below.
Detailed Description
The following detailed description of embodiments of the invention, but the invention can be practiced in many different ways, as defined and covered by the claims.
The formulations of examples 1-5 and comparative examples of a rapidly formed PVC-U pipe of the invention are shown in Table 1:
TABLE 1
Example 1
A fast-forming PVC-U pipe is prepared by the following steps:
step S10, preparing pretreated calcium carbonate: drying calcium carbonate in an oven at 95 ℃ for 2 hours, putting the calcium carbonate into a high-speed mixer, adding a silane coupling agent KH-550 accounting for 0.7 percent of the weight of the calcium carbonate, and mixing for 5 minutes at a high speed;
step S20, preparing modified EVA: adding 10 parts of EVA, 1.2 parts of pretreated calcium carbonate, 0.3 part of ethylene/octene copolymer and 0.3 part of lubricating dispersant into a high-speed mixer, stirring at a high speed, heating to 85 ℃ at a heating rate of 2 ℃/min, and keeping the temperature for 3 minutes to obtain modified EVA;
step S30, weighing the raw materials for preparing the rapidly molded PVC-U pipe according to the weight parts, wherein the heat stabilizer is mixture of barium ricinoleate, zinc anthranilate and epoxidized soybean oil in a weight ratio of 2:1:1, and the antioxidant is triisodecyl phosphite; the plasticizer is prepared by mixing dioctyl isophthalate and diphenyl isooctyl phosphate in a weight ratio of 1: 2;
step S40, mixing the polyvinyl chloride resin, the modified EVA, the chlorinated polyethylene, the plasticizer, the potassium titanate whisker, the antioxidant, the heat stabilizer, the calcium stearate and the stearic acid in parts by weight, and placing the mixture in a high-speed mixer for dispersing for 10 minutes to obtain a premix;
and S50, putting the premix obtained in the step S40 into a double-screw extruder, and extruding and molding at the temperature of 180 ℃ to obtain the rapidly molded PVC-U pipe.
Example 2
A fast-forming PVC-U pipe is prepared by the following steps:
step S10, preparing pretreated calcium carbonate: drying calcium carbonate in an oven at 95 ℃ for 2 hours, putting the calcium carbonate into a high-speed mixer, adding a silane coupling agent KH-550 accounting for 0.8 percent of the weight of the calcium carbonate, and mixing for 5 minutes at a high speed;
step S20, preparing modified EVA: adding 10 parts of EVA, 1.5 parts of pretreated calcium carbonate, 0.5 part of ethylene/octene copolymer and 0.15 part of lubricating dispersant into a high-speed mixer, stirring at a high speed, heating to 85 ℃ at a heating rate of 2 ℃/min, and keeping the temperature for 3 minutes to obtain modified EVA;
step S30, weighing the raw materials for preparing the rapidly molded PVC-U pipe according to the weight parts, wherein the heat stabilizer is the mixture of barium ricinoleate, zinc anthranilate and epoxidized soybean oil in a weight ratio of 2:1:1, and the antioxidant is the mixture of triisodecyl phosphite, antioxidant 1010 and antioxidant 300 in a weight ratio of 1:0.5: 1.2; the plasticizer is dioctyl adipate, diphenyl isooctyl phosphate and epoxy octyl stearate in a weight ratio of 1:2: 0.5;
step S40, mixing the polyvinyl chloride resin, the modified EVA, the chlorinated polyethylene, the plasticizer, the potassium titanate whisker, the antioxidant, the heat stabilizer, the calcium stearate and the stearic acid in parts by weight, and placing the mixture in a high-speed mixer for dispersing for 20 minutes to obtain a premix;
and S50, putting the premix obtained in the step S40 into a double-screw extruder, and extruding and molding at 165 ℃ to obtain the rapidly molded PVC-U pipe.
Example 3
A fast-forming PVC-U pipe is prepared by the following steps:
step S10, preparing pretreated calcium carbonate: drying calcium carbonate in an oven at 95 ℃ for 2 hours, putting the calcium carbonate into a high-speed mixer, adding a silane coupling agent KH-550 accounting for 0.9 percent of the weight of the calcium carbonate, and mixing for 5 minutes at a high speed;
step S20, preparing modified EVA: adding 10 parts of EVA, 2.5 parts of pretreated calcium carbonate, 0.4 part of ethylene/octene copolymer and 0.2 part of lubricating dispersant into a high-speed mixer, stirring at a high speed, heating to 85 ℃ at a heating rate of 2 ℃/min, and keeping the temperature for 3 minutes to obtain modified EVA;
step S30, weighing the raw materials for preparing the fast-forming PVC-U pipe according to the weight parts, wherein the heat stabilizer is mixture of barium ricinoleate, zinc anthranilate and epoxidized soybean oil in a weight ratio of 2:1:1, the antioxidant is mixture of triisodecyl phosphite, antioxidant 1010 and antioxidant 300 in a weight ratio of 1:0.5:1.2, and the plasticizer is dioctyl adipate, diisooctyl diphenyl phosphate and octyl epoxy stearate in a weight ratio of 1:4: 1.2;
step S40, mixing the polyvinyl chloride resin, the modified EVA, the chlorinated polyethylene, the plasticizer, the potassium titanate whisker, the antioxidant, the heat stabilizer, the calcium stearate and the stearic acid in parts by weight, and placing the mixture in a high-speed mixer for dispersing for 25 minutes to obtain a premix;
and S50, putting the premix obtained in the step S40 into a double-screw extruder, and extruding and molding at the temperature of 175 ℃ to obtain the rapidly molded PVC-U pipe.
Example 4
A fast-forming PVC-U pipe is prepared by the following steps:
step S10, preparing pretreated calcium carbonate: putting calcium carbonate into an oven at 95 ℃ for drying for 2 hours, putting the calcium carbonate into a high-speed mixer, adding a silane coupling agent KH-550 accounting for 1.0 percent of the weight of the calcium carbonate, and mixing for 5 minutes at a high speed;
step S20, preparing modified EVA: adding 10 parts of EVA, 2.0 parts of pretreated calcium carbonate, 0.2 part of ethylene/octene copolymer and 0.35 part of lubricating dispersant into a high-speed mixer, stirring at a high speed, heating to 85 ℃ at a heating rate of 2 ℃/min, and keeping the temperature for 3 minutes to obtain modified EVA;
step S30, weighing the raw materials for preparing the rapidly molded PVC-U pipe according to the weight parts, wherein the heat stabilizer is the mixture of barium ricinoleate, zinc anthranilate and epoxidized soybean oil in a weight ratio of 2:1:1, and the antioxidant is the mixture of triisodecyl phosphite and antioxidant 1010 in a weight ratio of 2: 1.2; the plasticizer is dioctyl isophthalate, dioctyl adipate, diphenyl isooctyl phosphate and epoxy octyl stearate in a weight ratio of 1:0.4:0.5: 1.2;
step S40, mixing the polyvinyl chloride resin, the modified EVA, the chlorinated polyethylene, the plasticizer, the potassium titanate whisker, the antioxidant, the heat stabilizer, the calcium stearate and the stearic acid in parts by weight, and placing the mixture in a high-speed mixer for dispersing for 15 minutes to obtain a premix;
and S50, putting the premix obtained in the step S40 into a double-screw extruder, and extruding and molding at the temperature of 190 ℃ to obtain the rapidly molded PVC-U pipe.
Example 5
A fast-forming PVC-U pipe is prepared by the following steps:
step S10, preparing pretreated calcium carbonate: drying calcium carbonate in an oven at 95 ℃ for 2 hours, putting the calcium carbonate into a high-speed mixer, adding a silane coupling agent KH-550 accounting for 0.8 percent of the weight of the calcium carbonate, and mixing for 5 minutes at a high speed;
step S20, preparing modified EVA: adding 10 parts of EVA, 2.0 parts of pretreated calcium carbonate, 0.3 part of ethylene/octene copolymer and 0.25 part of lubricating dispersant into a high-speed mixer, stirring at a high speed, heating to 85 ℃ at a heating rate of 2 ℃/min, and keeping the temperature for 3 minutes to obtain modified EVA;
step S30, weighing the raw materials for preparing the fast-forming PVC-U pipe according to the weight parts, wherein the heat stabilizer is mixture of barium ricinoleate, zinc anthranilate and epoxidized soybean oil in a weight ratio of 2:1:1, the antioxidant is mixture of triisodecyl phosphite, antioxidant 1010 and antioxidant 300 in a weight ratio of 1:0.5:1.2, and the plasticizer is dioctyl adipate, diisooctyl diphenyl phosphate and octyl epoxy stearate in a weight ratio of 1:3: 0.85;
step S40, mixing the polyvinyl chloride resin, the modified EVA, the chlorinated polyethylene, the plasticizer, the potassium titanate whisker, the antioxidant, the heat stabilizer, the calcium stearate and the stearic acid in parts by weight, and placing the mixture in a high-speed mixer for dispersing for 20 minutes to obtain a premix;
and S50, putting the premix obtained in the step S40 into a double-screw extruder, and extruding and molding at 185 ℃ to obtain the rapidly molded PVC-U pipe.
Comparative example 1
A fast-forming PVC-U pipe is prepared by the following steps:
step S10, weighing the raw materials for preparing the fast-forming PVC-U pipe according to the weight parts, wherein the heat stabilizer is mixture of barium ricinoleate, zinc anthranilate and epoxidized soybean oil in a weight ratio of 2:1:1, the antioxidant is mixture of triisodecyl phosphite, antioxidant 1010 and antioxidant 300 in a weight ratio of 1:0.5:1.2, and the plasticizer is dioctyl adipate, diisooctyl diphenyl phosphate and octyl epoxy stearate in a weight ratio of 1:3: 0.85;
step S20, mixing the polyvinyl chloride resin, the calcium carbonate, the chlorinated polyethylene, the plasticizer, the potassium titanate whisker, the antioxidant, the heat stabilizer, the calcium stearate and the stearic acid in parts by weight, and placing the mixture in a high-speed mixer for dispersing for 20 minutes to obtain a premix;
and S30, putting the premix obtained in the step S40 into a double-screw extruder, and performing extrusion molding at 168 ℃ to obtain the rapidly molded PVC-U pipe.
Comparative example 2
A fast-forming PVC-U pipe is prepared by the following steps:
step S10, preparing pretreated calcium carbonate: drying calcium carbonate in an oven at 95 ℃ for 2 hours, putting the calcium carbonate into a high-speed mixer, adding a silane coupling agent KH-550 accounting for 0.8 percent of the weight of the calcium carbonate, and mixing for 5 minutes at a high speed;
step S20, preparing modified EVA: adding 10 parts of EVA, 2.0 parts of pretreated calcium carbonate, 0.3 part of ethylene/octene copolymer and 0.25 part of lubricating dispersant into a high-speed mixer, stirring at a high speed, heating to 85 ℃ at a heating rate of 2 ℃/min, and keeping the temperature for 3 minutes to obtain modified EVA;
step S30, weighing the raw materials for preparing the rapidly molded PVC-U pipe according to the weight parts, wherein the heat stabilizer is mixture of barium ricinoleate, zinc anthranilate and epoxidized soybean oil in a weight ratio of 2:1:1, the antioxidant is antioxidant 1010, and the plasticizer is dioctyl adipate;
step S40, mixing the polyvinyl chloride resin, the modified EVA, the chlorinated polyethylene, the plasticizer, the potassium titanate whisker, the antioxidant, the heat stabilizer, the calcium stearate and the stearic acid in parts by weight, and placing the mixture in a high-speed mixer for dispersing for 20 minutes to obtain a premix;
and S50, putting the premix obtained in the step S40 into a double-screw extruder, and performing extrusion molding at 168 ℃ to obtain the rapidly molded PVC-U pipe.
Examples of the experiments
To further illustrate the technological advancement of the present invention, experiments are now taken to further illustrate it.
The experimental method comprises the following steps: the performance test of the fast-forming PVC-U pipe prepared by the invention is carried out, and the result is shown in Table 2.
TABLE 2 Performance test results of rapidly formed PVC-U tubing
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The fast-forming PVC-U pipe is characterized in that the raw materials for preparing the fast-forming PVC-U pipe comprise, by weight: 100 parts of polyvinyl chloride resin, 12-18 parts of modified EVA, 5-18 parts of chlorinated polyethylene, 6-12 parts of plasticizer, 2-6 parts of potassium titanate whisker, 0.1-0.5 part of antioxidant, 2.5-4 parts of heat stabilizer, 0.8-1.6 parts of calcium stearate and 1.5-2.5 parts of stearic acid; the heat stabilizer is prepared by mixing barium ricinoleate, zinc anthranilate and epoxidized soybean oil in a weight ratio of 2:1: 1; the antioxidant is selected from triisodecyl phosphite, antioxidant 1010 and antioxidant 300 which are mixed according to the weight ratio of 1:0.5: 1.2; the plasticizer is selected from at least two of dioctyl isophthalate, dioctyl adipate, diphenyl isooctyl phosphate and epoxy octyl stearate; the preparation method of the modified EVA comprises the following steps: adding EVA, pretreated calcium carbonate, ethylene/octene copolymer and lubricating dispersant into a high-speed mixer, stirring at high speed, heating to 85 ℃ at a heating rate of 2 ℃/min, and keeping the temperature for 3 minutes to obtain the modified EVA.
2. The fast forming PVC-U tube according to claim 1, wherein the plasticizer is dioctyl adipate, diphenyl isooctyl phosphate, epoxy octyl stearate in a weight ratio of 1: 2-4: 0.5-1.2.
3. The fast-forming PVC-U pipe according to claim 1, characterized in that the preparation method of the pretreated calcium carbonate comprises: the calcium carbonate is put into an oven with the temperature of 95 ℃ for drying for 2 hours, put into a high-speed mixer, added with a silane coupling agent KH-550 and mixed for 5 minutes at high speed.
4. The fast-forming PVC-U pipe according to claim 3, wherein the silane coupling agent KH-550 is added in an amount of 0.7 to 1.0% by weight of calcium carbonate.
5. The fast-forming PVC-U tube according to claim 1, wherein the raw materials for preparing the fast-forming PVC-U tube comprise, in parts by weight: 100 parts of polyvinyl chloride resin, 15 parts of modified EVA, 11.5 parts of chlorinated polyethylene, 9 parts of plasticizer, 4 parts of potassium titanate whisker, 0.3 part of antioxidant, 3.2 parts of heat stabilizer, 1.2 parts of calcium stearate and 2.0 parts of stearic acid.
6. A method for preparing the fast-forming PVC-U pipe according to any one of claims 1 to 5, characterized by comprising the following steps:
step S10, weighing the raw materials for preparing the rapidly molded PVC-U pipe according to the weight parts; step S20, mixing the polyvinyl chloride resin, the modified EVA, the chlorinated polyethylene, the plasticizer, the potassium titanate whisker, the antioxidant, the heat stabilizer, the calcium stearate and the stearic acid in parts by weight, and placing the mixture in a high-speed mixer for dispersing for 10 to 25 minutes to obtain a premix;
and S30, putting the premix obtained in the step S20 into a double-screw extruder for extrusion molding to obtain the rapidly molded PVC-U pipe.
7. The production method according to claim 6, wherein in step S30, the extrusion temperature of the twin-screw extruder is 165 ℃ to 195 ℃.
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