WO2023000709A1

WO2023000709A1 - Mixed ingredient of high-performance unplasticized polyvinyl chloride water supply pipe, and preparation method therefor

Info

Publication number: WO2023000709A1
Application number: PCT/CN2022/084276
Authority: WO
Inventors: 王章林; 徐林智; 陈智勇; 孙华丽; 徐军标; 刘良斌; 齐博
Original assignee: 公元股份有限公司
Priority date: 2021-07-21
Filing date: 2022-03-31
Publication date: 2023-01-26
Also published as: CN113337055B; CN113337055A

Abstract

The present invention relates to the technical field of pipeline materials and processing thereof, and relates to a mixed ingredient of a high-performance unplasticized polyvinyl chloride (PVC) water supply pipe, and a preparation method therefor. Provided are a mixed ingredient of a high-performance unplasticized PVC water supply pipe and a preparation method therefor, for use in solving the existing problems of poor heat resistance, etc. The mixed ingredient comprises the following components in parts by weight: PVC-SG 5: 25-50; PVC-SG 3: 50-70; a stabilizer: 1.5-3.0; a compound reinforcement material: 5.0-20; a lubricant: 0.1-5.0; and a coloring agent: 0.1-0.5. The compound reinforcement material is mainly composed of acrylic acid grafted copolymerized PVC, calcium carbonate whiskers, nano active calcium carbonate, and a dispersant. The method comprises mixing the mixed ingredient, performing melt extrusion on same, shaping same, cooling same, and cutting same to obtain the corresponding pipe material. The present invention can achieve the effects of high wear resistance, high heat resistance, high tensile strength, and low longitudinal shrinkage of the material.

Description

Mixing material and preparation method of high-performance rigid polyvinyl chloride water supply pipe

technical field

The invention relates to a compounding material and a preparation method of a high-performance rigid polyvinyl chloride water supply pipe, and belongs to the technical field of pipe materials and processing thereof.

Background technique

Rigid polyvinyl chloride (hereinafter referred to as PVC-U) plastic pipe is widely used in the field of building water supply and drainage due to its light weight, high cost performance, acid and alkali corrosion resistance, and quick installation and maintenance. It is currently the most widely used plastic at home and abroad. tubing.

In the plastic pipe industry, PVC-U pipe matrix resin usually adopts SG5 type PVC resin. During the processing of PVC-U pipe fittings, the fluidity requirements of materials are higher, and SG7 and SG8 with lower degree of polymerization but better fluidity are generally used. Type PVC resin, however, the use of PVC resin with a lower degree of polymerization will cause the mechanical properties and heat resistance of the product to deteriorate, which in turn will affect the overall service life of the pipeline.

With the rapid development of society, the height of buildings such as urban real estate and landmarks is getting higher and higher. At present, the existing rigid PVC water supply pipes on the market have low tensile strength, poor heat resistance, and hydrostatic resistance. Insufficient mechanical properties, etc., the longitudinal shrinkage rate of the pipe after installation is relatively large, especially in summer when the temperature difference is large, and the expansion and contraction of the pipe will easily lead to water seepage at the joint. At the same time, the drag and friction of PVC-U pipes during production, transportation, storage, and installation will also cause certain damage to the outer surface of the pipe, further reducing the performance of the pipe. To sum up, the existing PVC-U water supply pipes can no longer meet the performance requirements of water supply pipes for high-rise and super high-rise buildings. The water supply pipes commonly used in high-rise and super high-rise fields are galvanized steel pipes and PSP steel-plastic composite pipes.

However, galvanized steel pipes are difficult to install and maintain, and the internal joints are prone to rust and blockage over time, affecting water quality and sanitation; PSP steel-plastic composite pipes also have the disadvantages of difficult installation and maintenance, and are not resistant to wear. Therefore, through formula design, a PVC-U water supply pipe with ultra-high performance has been developed to further expand the application field of PVC-U water supply pipe products, so that it can fully meet the water supply needs of high-rise and super high-rise buildings, which is of great significance. commercial value and social benefits. In order to solve some of the above-mentioned problems, there are also different research and improvement methods in the existing literature, such as the existing patent literature (publication number: CN103289223B) disclosed by using PVC and CPVC blending to improve the heat resistance of PVC pipes, However, because CPVC is extremely sensitive to temperature during processing, it is also highly corrosive, which is not conducive to production, and the raw material formula and production costs are relatively high, which is not conducive to popularization.

Contents of the invention

The present invention aims at the defects existing in the above prior art, and provides a high-performance rigid polyvinyl chloride water supply pipe mixing material and a preparation method. The problem to be solved is how to make the PVC-U water supply pipe have high heat resistance, high Hydraulic and high wear resistance performance.

One of the objectives of the present invention is achieved through the following technical solutions, a compound of high-performance rigid polyvinyl chloride water supply pipe, characterized in that the compound comprises the following components by weight:

PVC-SG 5: 25~50; PVC-SG 3: 50~70; Stabilizer: 1.5~3.0; Composite reinforcement: 5.0~20; Lubricant: 0.1~5.0; Colorant: 0.1~0.5; The composite reinforcing material is mainly composed of acrylic acid grafted polyvinyl chloride, calcium carbonate whiskers, nano-active calcium carbonate and dispersant, and the acrylic acid grafted polyvinyl chloride: calcium carbonate whiskers: nano-active calcium carbonate: dispersed The mass ratio of the agent is 1:0.8～1.0:0.8～1.0:0.5～1.0.

When the pipeline is used as a water supply pipeline, it is necessary to consider the hydrostatic performance of the water supply pipeline. The inventor found that when a single PVC-SG5 was used as the matrix resin material, the static pressure resistance of the pipeline was significantly lower than that of the pipeline material formula design comparison. Hydraulic performance gains are extremely limited. Therefore, by adding PVC-SG3 and PVC-SG5 together as a matrix material, the different molecular weight distributions of the two can effectively ensure its processability and high hydrostatic resistance of the final product; at the same time, by grafting and copolymerizing acrylic acid Polyvinyl chloride (acrylic acid grafted polyvinyl chloride copolymer), calcium carbonate whiskers, nano-active calcium carbonate and dispersant are pre-processed into composite reinforcement materials, and the composite reinforcement materials contain acrylic acid graft copolymerized polyvinyl chloride and Calcium carbonate whisker material, which can make the whole compound have high integrity and stability under high temperature friction, so that the material has good wear resistance; and cooperate with the addition of nano-active calcium carbonate and dispersant to make them uniform It is dispersed in the overall system of rigid polyvinyl chloride. Compared with the conventional addition of calcium carbonate materials, it is used as a filler to reduce costs. The combination of nano-active calcium carbonate and calcium carbonate whiskers synergistically enhances the material when it is processed into pipes. Excellent heat resistance, tensile strength, and greatly reduce the longitudinal shrinkage of pipe products, which greatly enhances the ability of pipes to resist deformation due to temperature differences between day and night. The PVC-U water supply pipe made of the material of the present invention has high heat resistance, low longitudinal shrinkage, high wear resistance, high tensile strength, and high hydraulic resistance, so that it can completely replace galvanized steel pipe/PSP steel plastic Composite pipes are used in the field of water supply for high-rise/super high-rise buildings.

Through the synergistic effect of the above-mentioned components of the composite reinforced material, the present invention has an unexpected excellent effect on the performance of wear resistance and heat resistance, and the addition of stabilizers and lubricants can ensure the overall stability of the material. Processability, reduce equipment loss and prevent material decomposition. For the above-mentioned PVC-SG5 resin, it is better to use a resin with an average degree of polymerization of about 1000, which has good flow processability. For the above-mentioned PVC-SG3 resin, it is better to use a resin with an average degree of polymerization of about 1300, which has excellent comprehensive mechanical properties. performance.

In the compounding of the above-mentioned high-performance rigid polyvinyl chloride water supply pipes, preferably, the calcium carbonate whiskers are calcium carbonate whiskers with an aspect ratio of 25 to 35 and calcium carbonate crystals with an aspect ratio of 5 to 10. It must be a mixture of two different aspect ratios. By adopting two kinds of calcium carbonate whiskers with different length-to-diameter ratios, it is possible to achieve the effect of improving wear resistance and heat resistance and brightening the surface when the pipe is made from balanced compounding materials. As a further preference, the mass ratio of the calcium carbonate whiskers with an aspect ratio of 25-35 to the calcium carbonate whiskers with an aspect ratio of 5-10 is 1:0.8-1.2. In a further preferred solution, it is best to make the calcium carbonate whiskers have a length of 20-60 μm. In the research, it is found that the whiskers must be guaranteed to have a certain length. During the process of pipe forming, the whiskers will be distributed in the pipe in a relatively orderly manner under the action of the fluid or the direction of movement of the pipe, and the whiskers will be distributed in the pipe in a relatively orderly manner. The stable and uniform distribution of the pipe is more conducive to achieving high wear resistance, but if it is too long, it will be weakened by the movement direction of the pipe; at the same time, the whiskers of the above length are used, and the arrangement of the whiskers is highly ordered. , It can still maintain the integrity of its whiskers under high temperature friction, and ensure the stability of the whisker size, so as to achieve better wear resistance and heat resistance stability.

In the compounding material of the high-performance rigid polyvinyl chloride water supply pipe, preferably, the dispersant is ethylene bis stearic acid amide. It can improve the uniformity of distribution of raw materials in the compounded reinforcing material, and can also improve the uniformity of distribution of the compounded reinforcing material in the overall formula system, so that the lower limit of the performance of the pipeline product made of the material of the present invention is greatly improved; in addition On the one hand, during the pipe extrusion process, good dispersion greatly reduces the influence of pipe wall thickness fluctuations and host current instability caused by the uneven dispersion of compound reinforcing materials in the system.

In the compounding material of the above-mentioned high-performance rigid polyvinyl chloride water supply pipe, preferably, the particle diameter of the nano-active calcium carbonate is 30-50 nm. The use of nano-active calcium carbonate particles with the above particle size can improve the rheological properties of composite reinforcement materials, and the use of nano-scale particles has high specific surface area and high surface energy, making it easier to form mutual interactions between the interfaces of the mixed materials during processing. The overlapping structure has the effect of improving heat resistance.

In the compounding material of the above-mentioned high-performance rigid polyvinyl chloride water supply pipe, as a preference, the lubricant is a mixture of an internal lubricant and an external lubricant, and the internal lubricant is selected from monoglyceride, stearic acid and oxidized One or more of polyethylene; the external lubricant is selected from polyethylene wax and/or paraffin wax. The addition of the internal lubricant will directly act on the interior of the primary particles of polyvinyl chloride, increasing the friction between the primary particles, which is conducive to improving the degree of plasticization of the resin; while the addition of the external lubricant can prevent the material from sticking during processing, Ensure the continuity and stability of the pipe extrusion process.

In the compounding material of the above-mentioned high-performance rigid polyvinyl chloride water supply pipe, preferably, the compounding material further contains 0.5-3.0 parts by weight of an acrylic ester processing aid. When used as a pipe material, after melting in the mold, it can reduce the melt viscosity and pressure of the compounding material, and improve the overall fluidity of the material.

In the compounding of the above-mentioned high-performance rigid polyvinyl chloride water supply pipe, as a preference, the composite reinforcing material also contains 0.2 to 0.5 parts by weight of potassium titanate whiskers, and the length of the potassium titanate whiskers 22 to 25 μm. It can form a better synergistic effect with calcium carbonate whiskers, and can better improve the wear resistance and heat resistance and stability of the material.

In the above-mentioned high-performance rigid polyvinyl chloride water supply pipe compounding material, as a preference, the stabilizer is preferably a calcium-zinc composite stabilizer, which can ensure the stability of the compounding material during processing and extrusion, and facilitate processing and molding.

In the compounding material of the above-mentioned high-performance rigid polyvinyl chloride water supply pipe, as preferably, the colorant is a blend of titanium dioxide and organic blue pigment, and the mass content of the titanium dioxide accounts for 80% to 80% of the colorant. 85%, which can not only give the color requirements of the pipe used as a water supply pipe, but also enhance the aging resistance of the pipe. Of course, the colorant here can also be added with other pigments (the color of the high-performance polyvinyl chloride water supply pipe recommended in the CJ/T493-2016 standard is blue, so the pigment used in the present invention is organic blue).

The second object of the present invention is achieved through the following technical solutions, a method for preparing a high-performance rigid polyvinyl chloride water supply pipe, characterized in that the method comprises the following steps:

A, the raw material of above-mentioned mixed batching is put into the mixer and mixes;

B. Add the mixed raw materials into the extruder to control the temperature at 170°C to 220°C for melt extrusion, and then undergo vacuum shaping, cooling, and cutting to obtain the corresponding high-performance hard polyvinyl chloride water supply pipe.

Through the synergistic effect between the above-mentioned mixed ingredients and the components of the composite reinforcing material, the excellent effect of improving wear resistance and heat resistance is obtained; by using PVC-SG3 and PVC-SG5 as the matrix material, and making The mixed ingredients are melt-extruded at 190°C to 220°C and processed into water supply pipes to obtain excellent hydrostatic resistance; at the same time, the synergistic effect between the ingredients of the above mixed ingredients is used to make the mixed ingredients have better stability and Liquidity is good for production and processing.

In the preparation method of the above-mentioned high-performance rigid polyvinyl chloride water supply pipe, as a preference, the calcium carbonate whiskers described in the step A are prepared by the following method:

First add dry calcium oxide powder into water to form a suspension, and then add porous polytetrafluoroethylene plastic sheet;

Then raise the temperature of the suspension to 80°C to 90°C, add potassium chloride and magnesium chloride as crystal form control agents, and continue to feed carbon dioxide gas into the suspension system for reaction until the pH of the system is medium. When the temperature is high, the carbon dioxide is stopped, and the precipitate is separated, dried and crushed to obtain the corresponding calcium carbonate whiskers.

By adding a porous polytetrafluoroethylene plastic sheet, the purpose is to increase the gas attachment area, which is beneficial to the adsorption of the carbon dioxide gas introduced, which is beneficial to the formation of calcium carbonate whiskers, and is also conducive to improving the output efficiency of calcium carbonate whiskers; at the same time , by adding potassium chloride and magnesium chloride, it mainly acts as a crystal form control agent, so that the characteristics of calcium carbonate whiskers can be effectively formed, and it can also ensure that it has an ideal whisker aspect ratio.

In summary, compared with the prior art, the present invention has the following advantages:

1. Through the use of various components of the composite reinforcing material, through the combination of calcium carbonate whiskers, acrylic graft copolymerized polyvinyl chloride, nano-active calcium carbonate and dispersant, the material can achieve high wear resistance, high heat resistance, and high tensile strength. The effect of elongation and low longitudinal retraction.

2. By using two kinds of calcium carbonate whiskers with different length-to-diameter ratios, it can achieve the effect of improving wear resistance, heat resistance and surface brightness when the balanced compound is processed into pipe products.

3. By adding porous polytetrafluoroethylene plastic sheet as a carrier in the process of processing calcium carbonate whiskers, it can be more conducive to the formation of calcium carbonate whiskers and improve output efficiency, and the addition of potassium chloride and magnesium chloride can be more It is conducive to the formation of calcium carbonate whiskers with ideal aspect ratio.

detailed description

Below by specific embodiment, the technical scheme of the present invention is described in further detail, but the present invention is not limited to these embodiments.

Example 1

The compounding material of the high-performance rigid polyvinyl chloride water supply pipe of the present embodiment includes the following components by weight:

PVC-SG5: 50; PVC-SG3: 50; Calcium zinc stabilizer: 3.0; Composite reinforcement material: 20; Internal lubricant monoglyceride: 0.1; Internal lubricant oxidized polyethylene: 0.1; External lubricant polyethylene wax : 1.5, external lubricant paraffin: 0.2; processing aid: 1.0; coloring agent: 0.5; the above-mentioned composite reinforcing material is mainly composed of acrylic acid graft copolymerized polyvinyl chloride, calcium carbonate whiskers, nano-active calcium carbonate and dispersant, And the mass ratio of acrylic acid graft copolymerized polyvinyl chloride: calcium carbonate whisker: nano-active calcium carbonate: dispersant is 1.0:1.0:1.0:1.0, wherein, the dispersant is ethylene bis stearic acid amide; calcium carbonate whisker It is a calcium carbonate whisker with an aspect ratio of 30-35 and the length of the calcium carbonate whisker is 40 μm.

The colorant is a blend of titanium dioxide and organic blue pigment, and the mass content of titanium dioxide accounts for 80% of the colorant.

The above-mentioned mixed ingredients are used for the preparation process of rigid polyvinyl chloride water supply pipe:

SJZ-92/188 conical twin-screw extruder is used, the diameter of the screw head and tail is 92mm, 188mm, the effective length of the screw is 2000mm, and the temperature is kept at 140°C for 2 hours after starting up, and then the temperature of the barrel is set at 170-190°C. Set the confluence core temperature at 170°C, the mold temperature at 180-220°C, and the melt temperature at 190-220°C, input the high-performance hard polyvinyl chloride water supply pipe material into the barrel, start the feeding and the host screw, and slowly Increase to feed 15-20rpm, main engine 15-20rpm, main engine vacuum -0.06MPa, the material is extruded through the screw and the mold, then shaped by the sizing sleeve, cooled by the water tank, and finally cut to obtain high-performance hard PVC water supply pipes .

The above-mentioned acrylic acid graft copolymerized polyvinyl chloride used can be purchased directly from the market, and the following method is preferably used to prepare the above-mentioned acrylic acid graft copolymerized polyvinyl chloride:

According to the dosage ratio of each raw material, add polyvinyl chloride resin powder into xylene solvent, raise the temperature in water bath and control the temperature to 95°C, add dicumyl oxide DCP/dibenzoyl peroxide DBP as the initiator system, and then Add acrylic acid ACC solution, wherein the ratio of DCP:DBP:ACC is 1:1:25, and control the temperature at about 95°C to carry out stirring reaction for 2 hours, and separate and purify the product to obtain the corresponding acrylic acid graft copolymerization Vinyl chloride PVC-g-ACC.

The calcium carbonate whisker used above-mentioned is preferably prepared by the following method:

Add dry high-purity calcium oxide powder into deionized water to react to form a calcium hydroxide suspension, then add porous polytetrafluoroethylene plastic sheets, then raise the temperature of the suspension in a water bath to control the temperature to 85°C, add chlorinated Potassium and magnesium chloride saturated solution are used as crystal form control agents, and carbon dioxide gas is continuously fed into the suspension system at a certain rate until the pH value of the system is neutral, then the carbon dioxide gas supply is cut off, and the precipitate is separated, dried and pulverized, screened The corresponding calcium carbonate whiskers are obtained.

The above composite reinforcing materials can be premixed as follows:

SHR50L small-scale mixer with oil temperature control is used, the oil temperature is set to preheat to 40°C when starting up, and acrylic acid graft copolymerized polyvinyl chloride, calcium carbonate whiskers, nano-active calcium carbonate and dispersant are sequentially added in proportion, Mix at a low speed of 750rpm for 2 minutes, then turn to 1500rpm and mix at a high speed to 70°C, and discharge to obtain a composite reinforcing material.

The above-mentioned high-performance rigid polyvinyl chloride water supply pipe mixing material is preferably mixed to form a mixing material by the following method:

SHR800L large-scale mixer with oil temperature control is used, the oil temperature is set to preheat to 60°C, and the proportionally weighed PVC-SG5 resin, PVC-SG3 resin, stabilizer, internal lubricant, and external lubricant are sequentially mixed , processing aids and colorants are put into the hot mixing pot, and when the material is heated to 60°C at a spindle speed of 850rpm, then the compound reinforcing material is added, and the mixing is completed when the spindle speed is 1200rpm to 130°C, and the material is discharged. To the cold mixing pot, the cold mixing pot is cold mixed at a speed of 200rpm to 40°C, and the material is discharged, and the high-performance rigid polyvinyl chloride water supply pipe material is obtained.

Example 2

The compounding material of the high-performance rigid polyvinyl chloride water supply pipe of the present embodiment comprises the composition of following parts by weight:

PVC-SG5: 50; PVC-SG3: 50; Calcium zinc stabilizer: 3.0; Composite reinforcing material: 10; Internal lubricant monoglyceride: 0.1; Internal lubricant oxidized polyethylene: 0.1; External lubricant polyethylene wax : 1.0; processing aid: 1.0; colorant: 0.5; the above-mentioned composite reinforcing material is mainly composed of acrylic acid graft copolymerized polyvinyl chloride, calcium carbonate whiskers, nano-active calcium carbonate and dispersant, and acrylic acid graft copolymerized polyvinyl chloride The mass ratio of ethylene: calcium carbonate whiskers: nano-active calcium carbonate: dispersant is 1.0:1.0:1.0:0.8, wherein the dispersant is ethylene bis stearic acid amide; the calcium carbonate whiskers have an aspect ratio of 5~ 10 calcium carbonate whiskers and the length of the calcium carbonate whiskers is 30 μm.

The colorant is a blend of titanium dioxide and organic blue pigment, and the mass content of titanium dioxide accounts for 85% of the colorant.

The preparation of the above-mentioned mixed ingredients for rigid polyvinyl chloride water supply pipes and calcium carbonate whiskers is consistent with Example 1, and will not be repeated here.

Example 3

PVC-SG5: 25; PVC-SG3: 75; Calcium zinc stabilizer: 3.0; Compound reinforcement material: 10; Internal lubricant monoglyceride: 0.1; Internal lubricant stearic acid: 0.1; Internal lubricant oxidized polyethylene : 0.1; external lubricant polyethylene wax: 1.5; processing aid: 1.5; Composition, and the mass ratio of acrylic acid graft copolymerized polyvinyl chloride: calcium carbonate whisker: nano-active calcium carbonate: dispersant is 1.0:1.0:1.0:1.0, wherein, the dispersant is ethylene bis stearic acid amide, nano-active The particle size of the calcium carbonate is 30nm; the calcium carbonate whiskers are calcium carbonate whiskers with an aspect ratio of 25-35 and the length of the calcium carbonate whiskers is 20 μm.

Above-mentioned mixed batching is used for the preparation of hard polyvinyl chloride water supply pipe and the preparation of calcium carbonate whisker and is all consistent with embodiment 1, repeats no more here.

Example 4

PVC-SG5: 35; PVC-SG3: 70; calcium-zinc stabilizer: 1.5; compound reinforcement material: 15; internal lubricant monoglyceride: 1.0; internal lubricant stearic acid: 0.5; internal lubricant oxidized polyethylene : 1.0; external lubricant polyethylene wax: 1.0; processing aid: 0.5; coloring agent: 0.3; the above-mentioned composite reinforcing material is mainly composed of acrylic acid graft copolymerized polyvinyl chloride, calcium carbonate whiskers, nano-active calcium carbonate and dispersant Composition, and the mass ratio of acrylic acid graft copolymerized polyvinyl chloride: calcium carbonate whiskers: nano-active calcium carbonate: dispersant is 1.0:0.8:1.0:0.5. The particle diameter of above-mentioned nano active calcium carbonate is 30nm, and dispersant is ethylene bis stearic acid amide; Calcium carbonate whisker is the calcium carbonate whisker that aspect ratio is 25～35 and the aspect ratio is the carbonic acid of 5～10 Calcium whiskers are a mixture of two different aspect ratios, and the mass ratio of calcium carbonate whiskers with an aspect ratio of 25-35 to calcium carbonate whiskers with an aspect ratio of 5-10 is 1:0.8, and the above two The lengths of the calcium carbonate whiskers with aspect ratios were all 20 μm.

Example 5

PVC-SG5: 45; PVC-SG3: 60; Calcium zinc stabilizer: 2.5; Compound reinforcement material: 15; Internal lubricant monoglyceride: 1.0; Internal lubricant stearic acid: 2.0; External lubricant polyethylene wax : 2.0; processing aid: 2.0; colorant: 0.4; the above-mentioned composite reinforcing material is mainly composed of acrylic acid graft copolymerized polyvinyl chloride, calcium carbonate whiskers, nano-active calcium carbonate and dispersant, and acrylic acid graft copolymerized polyvinyl chloride Ethylene: calcium carbonate whiskers: nano-active calcium carbonate: dispersant mass ratio is 1.0:0.8:0.8:0.5, wherein the dispersant is ethylene bis stearic acid amide; calcium carbonate whiskers have an aspect ratio of 25~ 35 calcium carbonate whiskers and calcium carbonate whiskers with an aspect ratio of 5 to 10 are a mixture of two different aspect ratios, and calcium carbonate whiskers with an aspect ratio of 25 to 35 and calcium carbonate whiskers with an aspect ratio of 5 to 10 The mass ratio of the calcium carbonate whiskers is 1:1, and the lengths of the calcium carbonate whiskers of the above two aspect ratios are both 40 μm, and the particle size of the nano-active calcium carbonate is 40 nm.

The colorant is a blend of titanium dioxide and organic blue pigment, and the mass content of titanium dioxide accounts for 82% of the colorant.

The preparation of the above-mentioned mixed ingredients for the preparation of rigid polyvinyl chloride water supply pipes and calcium carbonate whiskers is consistent with that of Example 1, and will not be repeated here.

Example 6

PVC-SG5: 45; PVC-SG3: 60; Calcium zinc stabilizer: 2.5; Compound reinforcement material: 15; Internal lubricant monoglyceride: 1.0; Internal lubricant stearic acid: 2.0; External lubricant polyethylene wax : 2.0; processing aid: 2.0; colorant: 0.4; the above-mentioned composite reinforcing material is mainly composed of acrylic acid graft copolymerized polyvinyl chloride, calcium carbonate whiskers, nano-active calcium carbonate, dispersant and potassium titanate whiskers, and The mass ratio of acrylic acid graft copolymerized polyvinyl chloride: calcium carbonate whisker: nano-active calcium carbonate: dispersant is 1.0:0.8:0.8:0.5:0.2; the length of potassium titanate whisker is 22 μm, and the dispersant is B Bis stearic acid amide. Calcium carbonate whiskers are a mixture of calcium carbonate whiskers with an aspect ratio of 25-35 and calcium carbonate whiskers with an aspect ratio of 5-10, and calcium carbonate whiskers with an aspect ratio of 25-35 The mass ratio of the whiskers to the calcium carbonate whiskers with an aspect ratio of 5-10 is 1:1, and the lengths of the calcium carbonate whiskers with the above two aspect ratios are both 40 μm.

Comparative example 1

In order to illustrate the influence of the synergistic effect of the various components of the composite reinforcing material of the present invention on the wear resistance and heat resistance of processed pipes, this comparative example replaces calcium carbonate whiskers with nano-active calcium carbonate.

The compounding material of the high-performance rigid polyvinyl chloride water supply pipe of this comparative example comprises the composition of following parts by weight:

PVC-SG5: 35; PVC-SG3: 70; calcium-zinc stabilizer: 1.5; compound reinforcement material: 15; internal lubricant monoglyceride: 1.0; internal lubricant stearic acid: 0.5; internal lubricant oxidized polyethylene : 1.0; external lubricant polyethylene wax: 1.0; processing aid: 0.5; The mass ratio of branch copolymerized polyvinyl chloride: nano-active calcium carbonate: dispersant is 1.0:1.8:0.5. The particle diameter of above-mentioned nano active calcium carbonate is 30nm, and dispersant is ethylene bis stearic acid amide. The colorant is a blend of titanium dioxide and organic blue pigment, and the mass content of titanium dioxide accounts for 85% of the colorant.

Comparative example 2

In order to illustrate the synergistic effect of the present invention on the water pressure resistance of processed pipes by using two kinds of mixing of PVC-SG5 and PVC-SG3, this comparative example uses PVC-SG5 to replace PVC-SG3, that is, adopts a single PVC -SG5 was used as the base material for comparison.

PVC-SG5: 100; calcium zinc stabilizer: 3.0; compound reinforcement material: 10; internal lubricant monoglyceride: 0.1; internal lubricant stearic acid: 0.1; internal lubricant oxidized polyethylene: 0.1; external lubricant Polyethylene wax: 1.5; processing aid: 1.5; coloring agent: 0.5; the above-mentioned composite reinforcing material is mainly composed of acrylic acid grafted copolymerized polyvinyl chloride, calcium carbonate whiskers, nano-active calcium carbonate and dispersant, and acrylic acid grafted Copolyvinyl chloride: calcium carbonate whiskers: nano-active calcium carbonate: the mass ratio of dispersant is 1.0: 1.0: 1.0: 1.0, wherein, the dispersant is ethylene bis stearic acid amide, and the particle size of nano-active calcium carbonate is 30nm; the colorant is a blend of titanium dioxide and organic blue pigment, and the mass content of titanium dioxide accounts for 85% of the colorant.

Comparative example 3

In order to show the influence of the length of the calcium carbonate whiskers on the wear resistance, this comparative example uses longer calcium carbonate whiskers for comparison and illustration.

PVC-SG5: 50; PVC-SG3: 50; Calcium zinc stabilizer: 3.0; Composite reinforcement material: 20; Internal lubricant monoglyceride: 0.1; Internal lubricant oxidized polyethylene: 0.1; External lubricant polyethylene wax : 1.5, external lubricant paraffin: 0.2; processing aid: 1.0; coloring agent: 0.5; the above-mentioned composite reinforcing material is mainly composed of acrylic acid graft copolymerized polyvinyl chloride, calcium carbonate whiskers, nano-active calcium carbonate and dispersant, And the mass ratio of acrylic acid graft copolymerized polyvinyl chloride: calcium carbonate whisker: nano-active calcium carbonate: dispersant is 1.0:1.0:1.0:1.0, wherein, the dispersant is ethylene bis stearic acid amide; calcium carbonate whisker It is a calcium carbonate whisker with an aspect ratio of 30-35 and the length of the calcium carbonate whisker is 100 μm.

The mixed ingredients obtained in the above-mentioned examples and comparative examples were randomly selected to carry out corresponding performance tests. The specific test method is tested according to the mixed material requirements in the urban construction standard "CJ/T 493-2016 High-performance rigid polyvinyl chloride pipes and their connectors for water supply".

The specific test results are shown in Table 1 below:

Table 1:

The results from the above table 1 show that the heat resistance of the material can be effectively improved by adopting the composite reinforcing material of the present invention, which has a higher load heat distortion temperature, especially by adding a small amount of potassium titanate to the composite reinforcing material Whiskers, combined with calcium carbonate whiskers as a whole, have a better load heat distortion temperature than composite reinforcements without potassium titanate whiskers, indicating high heat resistance.

The mixed ingredients obtained in the above-mentioned examples and comparative examples were randomly selected and processed into corresponding pipe samples for corresponding performance tests. For the specific test method, refer to the urban construction standard "CJ/T493-2016 High-performance rigid polyvinyl chloride pipes and their connectors for water supply" (pipe specification (outer diameter × wall thickness): 200 × 4.9mm). The specific test results are shown in Table 2 and Table 3 below:

Table 2:

From the Vicat softening temperature in Table 2, it can also be shown that the material of the present invention has better heat resistance.

table 3:

As can be seen from the results in Table 3, it can be seen from the hydrostatic test at 20°C and the ring stress of 42MPa that it has good water pressure resistance.

The mixed ingredients of the above-mentioned examples and comparative examples were randomly selected and processed into sheets for detection of wear resistance, according to "GB/T 11982.1-2005 PVC Coiled Flooring Part 1: PVC Coiled Flooring with Substrate The "6.12 Abrasion Resistance" test part in "quotes the standard "GB/T 18102-2000 Impregnated Paper Laminated Wood Flooring", in which "6.3.11 Surface Wear Resistance Test" specifies the specific test method in detail. The specific test results are shown in Table 4 below:

Table 4:

The result shows that adopting the mixed batch of the present invention has higher wear resistance, and if the length of the calcium carbonate whiskers is too long, it is unfavorable to form the better requirement of wear resistance.

The specific embodiments described in the present invention are only to illustrate the spirit of the present invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Although the present invention has been described in detail and some specific examples have been cited, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention.

Claims

A compounding material for high-performance rigid polyvinyl chloride water supply pipes, characterized in that the compounding material comprises the following components by weight:

PVC-SG5: 25～50; PVC-SG3: 50～70; Stabilizer: 1.5～3.0; Composite reinforcing material: 5.0～20; Lubricant: 0.1～5.0; Colorant: 0.1～0.5; The reinforcing material is mainly composed of acrylic acid graft copolymerized polyvinyl chloride, calcium carbonate whiskers, nano-active calcium carbonate and dispersant, and the acrylic acid graft copolymerized polyvinyl chloride: calcium carbonate whisker: nano-active calcium carbonate: dispersant The mass ratio is 1:0.8-1.0:0.8-1.0:0.5-1.0.
According to the compounding material of the described high-performance rigid polyvinyl chloride water supply pipe material of claim 1, it is characterized in that, the calcium carbonate whisker is the calcium carbonate whisker that aspect ratio is 25～35 and aspect ratio is 5～10 A mixture of calcium carbonate whiskers with two different aspect ratios.
According to the compounding material of high-performance rigid polyvinyl chloride water supply pipe according to claim 2, it is characterized in that, the calcium carbonate whiskers with the aspect ratio of 25 to 35 and the calcium carbonate whiskers with an aspect ratio of 5 to 10 The mass ratio is 1:0.8～1.2.
The compounding material of high-performance rigid polyvinyl chloride water supply pipe according to claim 2, characterized in that the length of the calcium carbonate whiskers is 20-60 μm.
According to claim 1 or 2 or 3 or 4, the compounding material of high-performance rigid polyvinyl chloride water supply pipe is characterized in that the dispersant is ethylene bis stearic acid amide.
According to claim 1 or 2 or 3 or 4, the compounding material of high-performance rigid polyvinyl chloride water supply pipe is characterized in that the particle diameter of the nano-active calcium carbonate is 30-50nm.
According to claim 1 or 2 or 3 or 4 described high-performance rigid polyvinyl chloride water supply pipe material, it is characterized in that the lubricant is a mixture of internal lubricant and external lubricant, and the internal lubricant is selected from One or more of monoglyceride, stearic acid and oxidized polyethylene; the external lubricant is selected from polyethylene wax and/or paraffin wax.
According to claim 1 or 2 or 3 or 4, the compound of high-performance rigid polyvinyl chloride water supply pipe is characterized in that, the compound also contains 0.5-3.0 parts by weight of acrylic ester processing aid.
A method for preparing a high-performance rigid polyvinyl chloride water supply pipe, characterized in that the method comprises the following steps:

A, drop the raw material of the mixed batch described in any one of above-mentioned claims 1-8 in the mixer and carry out mixing;

B. Add the mixed raw materials into the extruder to control the temperature at 170°C to 220°C for melt extrusion, and then shape and cool to obtain the corresponding high-performance hard polyvinyl chloride water supply pipe.
According to the preparation method of the described high-performance rigid polyvinyl chloride water supply pipe material of claim 9, it is characterized in that, the calcium carbonate whisker described in the step A is prepared by the following method:

First add dry calcium oxide powder into water to form a suspension, and then add porous polytetrafluoroethylene plastic sheet;

Then raise the temperature of the suspension to 80°C to 90°C, add potassium chloride and magnesium chloride as crystal form control agents, and continue to feed carbon dioxide gas into the suspension system for reaction until the pH of the system is medium. When the temperature is high, the carbon dioxide is stopped, and the precipitate is separated, dried and crushed to obtain the corresponding calcium carbonate whiskers.