CN111763389A - PVC-U drainage pipe and preparation method thereof - Google Patents
PVC-U drainage pipe and preparation method thereof Download PDFInfo
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- CN111763389A CN111763389A CN202010525238.1A CN202010525238A CN111763389A CN 111763389 A CN111763389 A CN 111763389A CN 202010525238 A CN202010525238 A CN 202010525238A CN 111763389 A CN111763389 A CN 111763389A
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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
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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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
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
Abstract
The invention provides a PVC-U drainage pipe and a preparation method thereof, wherein the pipe is composed of the following raw materials in parts by weight: 100 portions of PVC-SC5 resin, 30 to 45 portions of carboxyl nitrile rubber powder, 0.5 to 0.8 portion of polyhydric alcohol diacetal-alumina graft, 0.1 to 0.3 portion of glass fiber treated by silane coupling agent, 1.0 to 1.5 portions of di (2-ethylhexyl) phthalate, 5.0 to 5.5 portions of liquid calcium zinc stabilizer, 1.5 to 1.8 portions of titanium pigment, 5 to 8 portions of whitening agent and 20 to 25 portions of light calcium. Through the preparation processes of raw material mixing, plasticizing granulation, blank extrusion, vacuum cooling molding and traction, the carboxylic butyronitrile rubber powder with a core-shell structure and PVC-SC5 resin are physically crosslinked, the relation between molecular chains is effectively increased, the toughness of the material is improved, the polyol diacetal-alumina graft can promote crystallization, the polyol diacetal-alumina graft can play a role of a crystal nucleus in the crystallization process of the polymer, the crystallization speed is accelerated, fine and compact spherulite particles are formed, the impact strength and yield strength of the product can be improved, the processability of the product can be improved, and the material has good processability.
Description
Technical Field
The invention belongs to the technical field of PVC (polyvinyl chloride) pipe production, and particularly relates to a PVC-U drainage pipe and a preparation method thereof.
Background
The PVC pipe in China is developed quickly, the annual growth rate reaches 8%, and the annual demand growth rate is 2%. Among plastic pipes, the PVC pipe has a long-distance leading use level, and is widely applied to water supply and drainage pipelines. At present, PVC pipe production mostly continues to use production methods in the 90 s, the used materials for manufacturing plastic pipes are divided into two types, one type is made of PVC and common calcium carbonate as main raw materials, the manufactured pipes have high cost, and other properties such as strength, toughness, corrosion resistance, heat resistance and other physical and chemical properties are common; the other is that the PVC pipe is prepared by using recycled PVC and calcium carbonate as main raw materials, although the manufactured pipe has low cost, the produced PVC pipe has the advantages of no white color, rough inner and outer smoothness, poor physical and chemical properties such as strength, toughness, corrosion resistance, heat resistance and the like, and poor impact resistance, freezing resistance, high temperature resistance and the like.
In view of the above, there is a need to provide a new PVC-U drainage pipe material which has good tensile property, high tear strength, environmental protection, and good processability by controlling the nucleating agent.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a PVC-U drainage pipe and a preparation method thereof, which realize the purposes of reducing the cost, ensuring the production stability, improving the impact resistance, enhancing the toughness and the strength and having higher corrosion resistance.
In order to achieve the purpose, the invention provides the following technical scheme:
a PVC-U drainage pipe is composed of the following raw materials in parts by weight: 100 portions of PVC-SC5 resin, 30 to 45 portions of carboxyl nitrile rubber powder, 0.5 to 0.8 portion of polyhydric alcohol diacetal-alumina graft, 0.1 to 0.3 portion of glass fiber treated by silane coupling agent, 1.0 to 1.5 portions of di (2-ethylhexyl) phthalate, 5.0 to 5.5 portions of liquid calcium zinc stabilizer, 1.5 to 1.8 portions of titanium pigment, 5 to 8 portions of whitening agent and 20 to 25 portions of light calcium.
Further, the PVC-U drainage pipe is composed of the following raw materials in parts by weight: 125 parts of PVC-SC5 resin, 40 parts of carboxyl nitrile rubber powder, 0.5 part of polyhydric alcohol diacetal-alumina graft, 0.2 part of glass fiber treated by a silane coupling agent, 1.0 part of di (2-ethylhexyl) phthalate, 5 parts of liquid calcium zinc stabilizer, 1.5 parts of titanium dioxide, 5 parts of whitening agent and 25 parts of light calcium.
Furthermore, the carboxyl acrylonitrile butadiene rubber powder is in a core-shell structure, wherein the core is acrylonitrile butadiene rubber, and the shell is a plastic carboxyl unsaturated hydrocarbon polymer.
Further, the preparation method of the carboxyl butyronitrile rubber powder comprises the following steps: copolymerizing butadiene and acrylonitrile by an emulsion copolymerization method, then adding unsaturated hydrocarbon containing carboxyl, grafting into powder by a suspension grafting method, and then washing, drying and crushing to obtain the modified butadiene-acrylonitrile copolymer; wherein, the unsaturated hydrocarbon containing carboxyl is at least one of acrylic acid, crotonic acid and methacrylic acid.
Further, the preparation method of the glass fiber treated by the silane coupling agent comprises the following steps: firstly, mixing a silane coupling agent with methanol and water to prepare a mixed solution A, then adding acetic acid into the mixed solution A to obtain a mixed solution B, then placing the pretreated common glass fiber into the mixed solution B, ultrasonically oscillating for 30-40 minutes, then standing for 10-20 minutes, taking out, washing with acetone, and drying at the temperature of 135-140 ℃ for 3-8 hours.
Further, the silane coupling agent is selected from any one of 3-aminopropyltriethoxysilane, N-2-aminoethyl-3-aminopropyltrimethoxysilane and diethylenetriaminopropyltrimethoxysilane.
Furthermore, the length of the glass fiber is 5-60 μm, and the diameter is 100nm-5 μm.
Further, the liquid calcium zinc stabilizer is a calcium zinc stabilizer of model WT-TM202, and the specific gravity of the liquid calcium zinc stabilizer is 0.97-0.98g/cm3。
A preparation method of the PVC-U drainage pipe comprises the following steps:
the method comprises the following steps: mixing the raw materials, weighing PVC-SC5 resin, carboxyl butyronitrile rubber powder, polyalcohol diacetal-alumina graft, glass fiber treated by silane coupling agent, di (2-ethylhexyl) phthalate, liquid calcium zinc stabilizer, titanium pigment, whitening agent and light calcium raw materials according to the proportion, putting the raw materials into a material cylinder of a high-low temperature mixer, mixing at high temperature, taking out the high-temperature mixture into a cold cylinder when the temperature of the mixture in the hot cylinder reaches 110-130 ℃, and discharging the mixed material when the temperature of the mixture in the cold cylinder is reduced to 40-50 ℃ to prepare the mixture for later use;
step two: plasticizing and granulating, namely putting the mixture discharged in the step one into a granulator, wherein the rotating speed of a main machine of the granulator is 30 revolutions per minute, the temperature of a first area of a charging barrel of the granulator is 180-190 ℃, the temperature of a second area of the charging barrel is 190-200 ℃, the temperature of a third area of the charging barrel is 195-205 ℃, the temperature of a fourth area of the charging barrel is 185-195 ℃, and the temperature of a granulating die is 200-210 ℃ to prepare granules with the particle size of 1.5 mm;
step three: extruding a pipe blank, namely feeding the granular material prepared in the second step into a double-screw extruder when the temperature of the granular material is reduced to 40-50 ℃, wherein the rotating speed of an extrusion screw is 25 revolutions per minute, the rotating speed of a feeding screw is 55 revolutions per minute, the temperature of an extrusion first zone is 195 ℃, the temperature of an extrusion second zone is 185 ℃, the temperature of an extrusion third zone is 175 ℃, the torque of the screw is 43 N.m, the material pressure in a charging barrel is 23MPa under the rotation of the screw, the material temperature is 175-185 ℃, the temperature of a connecting part of the screw and a grinding tool is 165-175 ℃, the temperature of a die first zone is 185-195 ℃, the temperature of a die second zone is 180-190 ℃, the temperature of a die third zone is 200-210 ℃, and extruding the pipe blank;
step four: the pipe is cooled and formed in vacuum, the pipe blank is sized and cooled immediately when being extruded out of a die, the extruded pipe blank is placed into a vacuum sizing cooling box, a method of internal pressure and external sizing is adopted, compressed air is introduced into the pipe blank, the pipe blank is sized in a vacuum method, the vacuum degree of the pipe blank is 0.065-0.070MPa, the sizing pressure of the compressed air is 0.04-0.05MPa, and the blank is sized to prepare the formed PVC drainage pipe;
step five: and (3) dragging, wherein the formed PVC drainage pipe is placed in a dragging crawler belt during dragging, the pipe is not clamped by the crawler belt, the dragging speed is adjusted to be 8-10% faster than the extrusion speed, the formed PVC drainage pipe is cut according to the requirement and the conventional mode after dragging, and the cut PVC drainage pipe is inspected to be qualified and warehoused.
The raw materials are selected and combined, so that the effects of the raw materials generate a synergistic effect, the tensile strength, the hardness, the impact resistance and the fracture elongation of the product can be effectively improved, and the functional effects of the raw materials are as follows:
PVC-SC5 resin: PVC (polyvinyl chloride) is prepared by synthesizing vinyl chloride from acetylene gas and hydrogen chloride and then polymerizing the vinyl chloride, and has high mechanical strength and good corrosion resistance. The polyvinyl chloride molecule contains chlorine atoms, is a material with strong polarity due to the dipole influence of C-CL bonds, and has good acid resistance, alkali resistance and wear resistance. The resin is mainly used as an impact modifier for PVC hard products, and has high aging resistance and high weld angle strength. The impact resistance of the PVC product and the processing performance thereof can be improved. The resin is a plastic assistant with dual functions of impact resistance modification and processing modification, and the PVC product has excellent impact resistance, low-temperature toughness, compatibility with PVC, weather resistance, stability and processability due to the core/shell structure, and moderate performance to price ratio, so that the fluidity and thermal deformation of PVC melt can be obviously improved, the plasticization is promoted, and the surface of the product is smooth and attractive.
Titanium dioxide: the PVC composite material is applied to the PVC drainage pipe industry, and can effectively improve the heat resistance, light resistance and weather resistance of the PVC pipe, improve the physical and chemical properties of the PVC pipe, enhance the color of the PVC pipe and prolong the service life of the PVC pipe.
Light calcium carbonate: the filler is applied to the PVC drainage pipe industry, can ensure that the surface performance of the pipe is good, improve the formability of the pipe, ensure that the pipe is easy to shape, and can reduce the cost.
The liquid calcium zinc stabilizer and the whitening agent belong to the existing additives, and respectively improve the stability and appearance of the PVC material.
The raw materials all belong to the existing perfect technology, and the invention adds the following formula raw materials on the basis of the raw materials, and the functions and the effects of the raw materials are as follows:
the carboxyl nitrile rubber powder is in a core-shell structure, wherein the core is nitrile rubber, and the shell is a plastic carboxyl unsaturated hydrocarbon polymer.
The carboxyl butyronitrile rubber powder with the core-shell structure has obvious interface effect, the active surface strongly adsorbs molecular chains of a PVC matrix, and usually, a plurality of molecular chains are connected on the surface of one particle to form physical crosslinking among chains. The particles with adsorbed molecular chains can play a role in uniformly distributing load, and reduce the possibility of breaking the polymer. On the other hand, the PVC resin has a microphase separation structure on the microscopic scale, hard segment molecules are strongly associated together to form a plurality of microdomains to be dispersed in a soft segment phase matrix, the soft segment phase provides elasticity, and the hard segment phase plays a role in reinforcing filling and crosslinking. PVC is a linear polymer formed by connecting VCM monomers in a head-tail structure, and more hydrogen bonds can be formed between-COOH carried on the shell of carboxyl nitrile rubber powder particles and PVC groups, so that the binding force between the particles and a matrix is increased. When a small amount of carboxyl butyronitrile rubber powder is added, the nano-scale particles serve as hard segments and serve as a part of physical crosslinking points to effectively increase the relation among molecular chains, and when external force is applied, the nano-scale particles serve as stress concentrators to induce a large amount of silver lines and shear bands, absorb energy, control and stop the silver line development by the rubber powder particles and the shear bands, so that the silver lines are prevented from forming destructive cracks, and the enhancement and toughening are realized.
However, the specific surface area of the carboxyl butyronitrile rubber powder particles is large, and the agglomeration and uneven distribution of the rubber powder are also easy to serve as defects to initiate cracks, so that the material is damaged. The glass fiber can play a role of preventing crack propagation similar to rubber particles, and the glass fiber modified by the silane coupling agent can also adsorb carboxyl butyronitrile rubber powder particles, so that the carboxyl butyronitrile rubber powder particles are dispersed and prevented from being agglomerated. That is to say, good synergism can be played between carboxyl butyronitrile rubber powder particle and the glass fiber, and in addition, glass fiber's tensile strength is high, can promote the tensile strength of material.
The polyhydric alcohol diacetal-alumina graft can promote crystallization, can play a role of a crystal nucleus in the crystallization process of a polymer, accelerates the crystallization speed, forms fine and compact spherulite particles, enables a molecular chain to have a fast crystallization speed at a higher temperature, is favorable for improving the impact strength and the yield strength of a product, can also improve the processing performance of the product, and enables the material to have good processability.
Di (2-ethylhexyl) phthalate allows the viscosity of the material to be controlled to meet processing requirements.
The PVC drainage pipe prepared from the raw materials has excellent chemical stability, and effectively improves the tensile strength, hardness, impact resistance and elongation at break of the product.
Compared with the prior art, the invention has the beneficial effects that: the PVC-U drainage pipe has the advantages that the tensile strength is improved to 60-70MPa, the fracture elongation is improved to 80-105% from 70% of the market, the tearing strength is improved by about 10%, the PVC-U drainage pipe has high thermal shock resistance and low thermal deformation rate, has excellent chemical stability compared with the existing pipe on the market, and effectively improves the tensile strength, hardness, shock resistance and fracture elongation of the product.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, but not all embodiments.
In the examples, the silane coupling agent is 3-aminopropyltriethoxysilane, and the calcium-zinc stabilizer is selected from BAEROSTAB CT 303TX, a model of Shanghai Kunrui chemical industry Co., Ltd. The whitening agent is a Rickett C-12 high-efficiency fluorescent whitening agent.
Example 1
The PVC-U drainage pipe provided by the embodiment is prepared by weighing the following raw materials in parts by weight: 100kg of PVC-SC5 resin, 30kg of carboxyl nitrile rubber powder, 0.5kg of polyhydric alcohol diacetal-alumina graft, 0.1kg of glass fiber treated by a silane coupling agent, 1.0kg of di (2-ethylhexyl) phthalate, 5.0kg of liquid calcium zinc stabilizer, 1.5kg of titanium dioxide, 5kg of whitening agent and 20kg of light calcium.
The preparation method of the carboxyl butyronitrile rubber powder comprises the following steps: copolymerizing butadiene and acrylonitrile by an emulsion copolymerization method, then adding acrylic acid containing carboxyl, grafting into powder by a suspension grafting method, washing, drying and crushing to obtain the acrylic acid modified butadiene-acrylonitrile copolymer.
The preparation method of the glass fiber treated by the silane coupling agent comprises the following steps: firstly, mixing a silane coupling agent with methanol and water to prepare a mixed solution A, then adding acetic acid into the mixed solution A to obtain a mixed solution B, then putting the pretreated common glass fiber into the mixed solution B, ultrasonically oscillating for 30 minutes, then standing for 50 minutes, taking out, washing with acetone, and drying at 140 ℃ for 5 hours.
The preparation method of the PVC-U drain pipe comprises the following steps:
the method comprises the following steps: mixing the raw materials, weighing PVC-SC5 resin, carboxyl butyronitrile rubber powder, polyalcohol diacetal-alumina graft, glass fiber treated by silane coupling agent, di (2-ethylhexyl) phthalate, liquid calcium zinc stabilizer, titanium pigment, whitening agent and light calcium raw materials according to the proportion, putting the raw materials into a material cylinder of a high-low temperature mixer, mixing at high temperature, taking out the high-temperature mixture into a cold cylinder when the temperature of the mixture in the hot cylinder reaches 130 ℃, discharging the mixed material when the temperature of the mixture in the cold cylinder is reduced to 40 ℃ to prepare a mixture for later use;
step two: plasticizing and granulating, namely putting the mixture discharged in the step one into a granulator, wherein the rotating speed of a main machine of the granulator is 30 revolutions per minute, the temperature of a first area of a charging barrel of the granulator is 180 ℃, the temperature of a second area of the charging barrel is 200 ℃, the temperature of a third area of the charging barrel is 195 ℃, the temperature of a fourth area of the charging barrel is 195 ℃, and the temperature of a granulating die is 200 ℃ to prepare granules with the particle size of 1.5 mm;
step three: extruding a pipe blank, namely feeding the granular material prepared in the step two into a double-screw extruder when the temperature of the granular material is reduced to 40 ℃, wherein the rotating speed of an extrusion screw is 25 revolutions per minute, the rotating speed of a feeding screw is 55 revolutions per minute, the temperature of an extrusion first zone is 195 ℃, the temperature of an extrusion second zone is 185 ℃, the temperature of an extrusion third zone is 175 ℃, the torque of the screw is 43 N.m, the material pressure in a charging barrel is 23MPa under the rotation of the screw, the material temperature is 185 ℃, the temperature of a joint of the screw and a grinding tool is 165 ℃, the temperature of a die first zone is 185 ℃, the temperature of a die second zone is 180 ℃, the temperature of the die third zone is 210 ℃, and the pipe blank is extruded;
step four: the pipe is cooled and formed in vacuum, the pipe blank is sized and cooled immediately when being extruded out of a die, the extruded pipe blank is placed into a vacuum sizing cooling box, a method of inner pressure and outer sizing is adopted, compressed air is introduced into the pipe blank, the pipe blank is sized in a vacuum method, the vacuum degree of the pipe blank is 0.070MPa, and the sizing pressure of the compressed air is 0.05MPa, so that the blank is sized, and the formed PVC drainage pipe is manufactured;
step five: and (3) dragging, wherein the formed PVC drainage pipe is placed in a dragging crawler belt during dragging, the pipe is not clamped by the crawler belt, the dragging speed is adjusted to be 10% higher than the extrusion speed, the formed PVC drainage pipe is cut according to the requirement and the conventional mode after dragging, and the cut PVC drainage pipe is qualified for storage.
The raw materials in the invention can be directly purchased in the market, the extruder of the used equipment adopts an SJST-65 double screw extruder, and the extruder, a high-low temperature mixer, a granulator, a vacuum shaping cooling box and a tractor can be directly purchased in the market.
Example 2
Weighing the following raw materials in parts by weight: 125kg of PVC-SC5 resin, 45kg of carboxyl nitrile rubber powder, 0.8kg of polyhydric alcohol diacetal-alumina graft, 0.3kg of glass fiber treated by a silane coupling agent, 1.5kg of di (2-ethylhexyl) phthalate, 5.5kg of liquid calcium zinc stabilizer, 1.8kg of titanium dioxide, 8kg of brightener and 25kg of light calcium. The preparation method of the PVC-U drainage pipe is the same as that of the example 1.
Example 3
Weighing the following raw materials in parts by weight: 125kg of PVC-SC5 resin, 40kg of carboxyl nitrile rubber powder, 0.5kg of polyhydric alcohol diacetal-alumina graft, 0.2kg of glass fiber treated by a silane coupling agent, 1.0kg of di (2-ethylhexyl) phthalate, 5kg of liquid calcium zinc stabilizer, 1.5kg of titanium dioxide, 5kg of whitening agent and 25kg of light calcium. The preparation method of the PVC-U drainage pipe is the same as that of the example 1.
Comparative example 1
In this example, the following raw materials are weighed in parts by weight: 125kg of PVC-SC5 resin, 1.0kg of di (2-ethylhexyl) phthalate, 5kg of liquid calcium zinc stabilizer, 1.5kg of titanium dioxide, 5kg of whitening agent and 25kg of light calcium. The preparation method is basically the same as that of the example 1, and the only difference is that the additive carboxyl butyronitrile rubber powder is eliminated in the example, and meanwhile, the polyalcohol diacetal-alumina graft which is synergistic with the carboxyl butyronitrile rubber powder and the glass fiber which is treated by the silane coupling agent are removed.
Comparative example 2
In this example, the following raw materials are weighed in parts by weight: 125kg of PVC-SC5 resin, 40kg of carboxyl butyronitrile rubber powder, 1.0kg of di (2-ethylhexyl) phthalate, 5kg of liquid calcium zinc stabilizer, 1.5kg of titanium white, 5kg of whitening agent and 25kg of light calcium. The preparation method is basically the same as that of the example 1, and the only difference is that the addition of the polyol diacetal-alumina graft which is in synergistic action with the carboxyl nitrile rubber powder and the glass fiber treated by the silane coupling agent are eliminated in the example.
Comparative example 3
In this example, the following raw materials are weighed in parts by weight: 125kg of PVC-SC5 resin, 0.5kg of polyhydric alcohol diacetal-alumina graft, 0.2kg of glass fiber treated by a silane coupling agent, 1.0kg of di (2-ethylhexyl) phthalate, 5kg of liquid calcium zinc stabilizer, 1.5kg of titanium dioxide, 5kg of whitening agent and 25kg of light calcium. The preparation method is basically the same as that of the example 1, and the only difference is that the addition of carboxyl butyronitrile rubber powder is eliminated, and a polyol diacetal-alumina graft which has a synergistic effect with the carboxyl butyronitrile rubber powder and glass fiber treated by a silane coupling agent are reserved.
Physical property tests were conducted on the PVC-U drain pipe materials obtained in examples 1 to 3, and the results are shown in Table 1, and for comparison, the PVC-U drain pipe material of comparative example was subjected to the same tests.
Table 1: results of physical property testing of materials of examples 1 to 3 and comparative example:
through performance tests, the PVC-U drainage pipe disclosed by the invention has the advantages that the tensile strength is improved to 60-70MPa, the fracture elongation is improved to 80-105% from 70% of the non-carboxyl butyronitrile rubber powder, the tear strength is improved by about 10%, the PVC-U drainage pipe has stronger thermal shock resistance and lower thermal deformation rate, has excellent chemical stability compared with the existing pipe, and effectively improves the tensile strength, hardness, shock resistance and fracture elongation of the product. And the experimental data show that the performance of the PVC-U drainage pipe is remarkably improved after the carboxyl butyronitrile rubber powder is added, and meanwhile, the polymer such as the polyhydric alcohol diacetal-alumina graft can promote crystallization, can play a role of crystal nucleus in the crystallization process, and is beneficial to improving the impact strength and the yield strength of the product.
The materials of examples 1 to 3 and the commercial material (comparative example 4) were subjected to an ageing test, in particular, they were aged in an air oven at a temperature of 135 ℃ and a time of ageing of 168 hours, and then tested for mechanical properties: the low-temperature bending properties (temperature of-40 ℃ C., time of 16 hours), thermal shock resistance (temperature of 150 ℃ C., time of 1 hour) and heat distortion properties (150 ℃ C.), the results obtained are shown in Table 2:
table 2: results of aging Performance testing of examples 1 to 3 and comparative example materials:
| physical Properties | Test standard | Example 1 | Example 2 | Example 3 | Comparative example 4 |
| Low temperature bending | GB/T2951.41 | Without cracks | Without cracks | Without cracks | Has cracks |
| Thermal shock resistance | GB/T2951.31 | Without cracks | Without cracks | Without cracks | Has cracks |
| Thermal deformation% | UL1581 | 1.7 | 1.7 | 1.2 | 2.6 |
Therefore, the invention has high tensile property (more than 50MPa), high tearing strength (more than 500N/m), difficult crack, higher hardness and impact resistance than the prior pipe and long service life.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.
Claims (9)
1. The PVC-U drainage pipe is characterized by comprising the following raw materials in parts by weight: 100 portions of PVC-SC5 resin, 30 to 45 portions of carboxyl nitrile rubber powder, 0.5 to 0.8 portion of polyhydric alcohol diacetal-alumina graft, 0.1 to 0.3 portion of glass fiber treated by silane coupling agent, 1.0 to 1.5 portions of di (2-ethylhexyl) phthalate, 5.0 to 5.5 portions of liquid calcium zinc stabilizer, 1.5 to 1.8 portions of titanium pigment, 5 to 8 portions of whitening agent and 20 to 25 portions of light calcium.
2. The PVC-U drainage pipe material of claim 1, which is prepared from the following raw materials in parts by weight: 125 parts of PVC-SC5 resin, 40 parts of carboxyl nitrile rubber powder, 0.5 part of polyhydric alcohol diacetal-alumina graft, 0.2 part of glass fiber treated by a silane coupling agent, 1.0 part of di (2-ethylhexyl) phthalate, 5 parts of liquid calcium zinc stabilizer, 1.5 parts of titanium dioxide, 5 parts of whitening agent and 25 parts of light calcium.
3. The PVC-U drainage pipe material according to claim 1 or 2, wherein the carboxylated nitrile rubber powder has a core-shell structure, wherein the core is nitrile rubber and the shell is a plastic carboxylated unsaturated hydrocarbon polymer.
4. The PVC-U drainage pipe material of claim 3, wherein the preparation method of the carboxyl nitrile rubber powder comprises the following steps: copolymerizing butadiene and acrylonitrile by an emulsion copolymerization method, then adding unsaturated hydrocarbon containing carboxyl, grafting into powder by a suspension grafting method, and then washing, drying and crushing to obtain the modified butadiene-acrylonitrile copolymer; wherein, the unsaturated hydrocarbon containing carboxyl is at least one of acrylic acid, crotonic acid and methacrylic acid.
5. The PVC-U drainage pipe material of claim 1 or 2, wherein the preparation method of the glass fiber treated by the silane coupling agent comprises the following steps: firstly, mixing a silane coupling agent with methanol and water to prepare a mixed solution A, then adding acetic acid into the mixed solution A to obtain a mixed solution B, then placing the pretreated common glass fiber into the mixed solution B, ultrasonically oscillating for 30-40 minutes, then standing for 10-20 minutes, taking out, washing with acetone, and drying at the temperature of 135-140 ℃ for 3-8 hours.
6. A PVC-U drainage pipe as claimed in claim 5, wherein the silane coupling agent is selected from any one of 3-aminopropyltriethoxysilane, N-2-aminoethyl-3-aminopropyltrimethoxysilane and diethylenetriaminopropyltrimethoxysilane.
7. A PVC-U drainage pipe according to claim 5, wherein the glass fibers have a length of 5 μm to 60 μm and a diameter of 100nm to 5 μm.
8. A PVC-U drainage pipe as claimed in claim 1 or 2, wherein the liquid Ca-Zn stabilizer is a model WT-TM202 Ca-Zn stabilizer with a specific gravity of 0.97-0.98g/cm3。
9. A process for the preparation of a PVC-U drainage pipe according to any one of claims 1 to 8, comprising the steps of:
the method comprises the following steps: mixing the raw materials, weighing PVC-SC5 resin, carboxyl butyronitrile rubber powder, polyalcohol diacetal-alumina graft, glass fiber treated by silane coupling agent, di (2-ethylhexyl) phthalate, liquid calcium zinc stabilizer, titanium pigment, whitening agent and light calcium raw materials according to the proportion, putting the raw materials into a material cylinder of a high-low temperature mixer, mixing at high temperature, taking out the high-temperature mixture into a cold cylinder when the temperature of the mixture in the hot cylinder reaches 110-130 ℃, and discharging the mixed material when the temperature of the mixture in the cold cylinder is reduced to 40-50 ℃ to prepare the mixture for later use;
step two: plasticizing and granulating, namely putting the mixture discharged in the step one into a granulator, wherein the rotating speed of a main machine of the granulator is 30 revolutions per minute, the temperature of a first area of a charging barrel of the granulator is 180-190 ℃, the temperature of a second area of the charging barrel is 190-200 ℃, the temperature of a third area of the charging barrel is 195-205 ℃, the temperature of a fourth area of the charging barrel is 185-195 ℃, and the temperature of a granulating die is 200-210 ℃ to prepare granules with the particle size of 1.5 mm;
step three: extruding a pipe blank, namely feeding the granular material prepared in the second step into a double-screw extruder when the temperature of the granular material is reduced to 40-50 ℃, wherein the rotating speed of an extrusion screw is 25 revolutions per minute, the rotating speed of a feeding screw is 55 revolutions per minute, the temperature of an extrusion first zone is 195 ℃, the temperature of an extrusion second zone is 185 ℃, the temperature of an extrusion third zone is 175 ℃, the torque of the screw is 43 N.m, the material pressure in a charging barrel is 23MPa under the rotation of the screw, the material temperature is 175-185 ℃, the temperature of a connecting part of the screw and a grinding tool is 165-175 ℃, the temperature of a die first zone is 185-195 ℃, the temperature of a die second zone is 180-190 ℃, the temperature of a die third zone is 200-210 ℃, and extruding the pipe blank;
step four: the pipe is cooled and formed in vacuum, the pipe blank is sized and cooled immediately when being extruded out of a die, the extruded pipe blank is placed into a vacuum sizing cooling box, a method of internal pressure and external sizing is adopted, compressed air is introduced into the pipe blank, the pipe blank is sized in a vacuum method, the vacuum degree of the pipe blank is 0.065-0.070MPa, the sizing pressure of the compressed air is 0.04-0.05MPa, and the blank is sized to prepare the formed PVC drainage pipe;
step five: and (3) dragging, wherein the formed PVC drainage pipe is placed in a dragging crawler belt during dragging, the pipe is not clamped by the crawler belt, the dragging speed is adjusted to be 8-10% faster than the extrusion speed, the formed PVC drainage pipe is cut according to the requirement and the conventional mode after dragging, and the cut PVC drainage pipe is inspected to be qualified and warehoused.
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| CN107200968A (en) * | 2017-07-20 | 2017-09-26 | 合肥安力电力工程有限公司 | A kind of drainpipe and preparation method thereof |
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| CN103304934A (en) * | 2013-07-03 | 2013-09-18 | 南阳森源塑胶有限公司 | PVC (Polyvinyl Chloride) water discharge tube material and preparation method thereof |
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Application publication date: 20201013 |