CN111793298A - Silencing inclined tee pipe and preparation method thereof - Google Patents
Silencing inclined tee pipe and preparation method thereof Download PDFInfo
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- CN111793298A CN111793298A CN202010525230.5A CN202010525230A CN111793298A CN 111793298 A CN111793298 A CN 111793298A CN 202010525230 A CN202010525230 A CN 202010525230A CN 111793298 A CN111793298 A CN 111793298A
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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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F279/00—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00
- C08F279/02—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00 on to polymers of conjugated dienes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
- F16L55/0336—Noise absorbers by means of sound-absorbing materials
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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
-
- 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
-
- 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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
-
- 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
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/53—Core-shell polymer
Abstract
The invention provides a silencing inclined tee pipe and a preparation method thereof, wherein the silencing inclined tee pipe is composed of the following raw materials in parts by weight: 100 portions of PVC resin, 30 to 45 portions of carboxylic acrylonitrile butadiene rubber powder, 20 to 25 portions of barium sulfate, 30 to 33 portions of light calcium carbonate, 0.6 to 1.0 portion of PE wax, 4.5 to 5.0 portions of calcium zinc stabilizer, 1.1 to 1.5 portions of titanium dioxide, 2.0 to 2.5 portions of ACR, 0.3 to 0.5 portion of stearic acid, 1.5 to 2.0 portions of dioctyl ester and 8 to 10 portions of whitening agent. Through the preparation procedures of raw material mixing, plasticizing granulation, blank extrusion and vacuum cooling molding, the carboxylic acrylonitrile butadiene rubber powder with a core-shell structure and PVC resin are physically crosslinked, the connection among molecular chains is effectively increased, the noise of a pipeline is well controlled by controlling the content proportion of barium sulfate, and compared with a common polyethylene drain pipe, the noise is reduced by 2.5-12.5dB, the pipeline still has better impact strength and tensile strength, and meanwhile, the preparation process is simple in steps and convenient to use and install.
Description
Technical Field
The invention belongs to the technical field of PVC (polyvinyl chloride) pipe production, and particularly relates to a silencing inclined tee 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.
Meanwhile, the PVC pipe has a fatal weakness that the noise is very large during drainage, the silence of a living room is influenced, and people can be awakened from sweet dream at times. The reason for the greater noise associated with conventional drains is the absence of a strong acoustical material such as barium sulfate in the drain composition. In the face of noise, people make a lot of efforts, and various noise reduction drainage pipes are developed successively, but the effect is not good.
In view of the above, it is necessary to provide a new modified muffler tube to reduce the noise of the pipe.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a silencing inclined tee pipe and a preparation method thereof, which can improve the elongation at break and the tensile strength of the pipe, enhance the toughness and reduce the water flow noise of the pipe.
In order to achieve the purpose, the invention provides the following technical scheme:
a silencing inclined tee pipe is composed of the following raw materials in parts by weight: 100 portions of PVC resin, 30 to 45 portions of carboxylic acrylonitrile butadiene rubber powder, 20 to 25 portions of barium sulfate, 30 to 33 portions of light calcium carbonate, 0.6 to 1.0 portion of PE wax, 4.5 to 5.0 portions of calcium zinc stabilizer, 1.1 to 1.5 portions of titanium dioxide, 2.0 to 2.5 portions of ACR, 0.3 to 0.5 portion of stearic acid, 1.5 to 2.0 portions of dioctyl ester and 8 to 10 portions of whitening agent.
Further, the pipe is composed of the following raw materials in parts by weight: 100 parts of PVC resin, 35 parts of carboxyl nitrile rubber powder, 20 parts of barium sulfate, 33 parts of light calcium carbonate, 0.6 part of PE wax, 5.0 parts of calcium-zinc stabilizer, 1.5 parts of titanium dioxide, 2.5 parts of ACR, 0.5 part of stearic acid, 1.5 parts of dioctyl ester and 8 parts of brightener.
Furthermore, 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.
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 whitening agent is 2,2- (4, 4-distyryl) dibenzoxazole.
A preparation method of the silencing inclined tee pipe comprises the following steps:
the method comprises the following steps: mixing the raw materials, weighing the raw materials according to the proportion, putting the raw materials into a material jar of a high-low temperature mixer, carrying out high-temperature mixing, taking out the high-temperature mixture into a cold jar when the temperature of the mixture in the hot jar reaches 120-130 ℃, and discharging the mixed material when the temperature of the mixture in the cold jar 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 charging barrel zone of the granulator is 180-190 ℃, 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 step two 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 area is 160 plus materials, the torque of the screw is 43 N.m, and the pipe blank is extruded;
step four: and (3) carrying out vacuum cooling molding on the pipe, immediately sizing and cooling the pipe blank when the pipe blank is extruded out of the die, putting the extruded pipe blank into a vacuum sizing cooling box, and sizing the blank by adopting an internal pressure external sizing method to prepare the molded pipe.
The raw materials are selected and combined, so that the effects of the raw materials generate a synergistic effect, the tensile strength and the elongation at break of the product can be effectively improved, and the functional effects of the raw materials are as follows:
PVC resin: 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.
The stabilizer and the whitening agent belong to the existing additives, which 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:
barium sulfate: the industrial grade grinding powder and the rigid sound-absorbing material have the function of absorbing sound energy, so that the purpose of reducing noise of the drain pipe is achieved.
Activated calcium carbonate: filler, but it also has a certain sound absorption capacity.
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.
The pipe prepared from the raw materials has excellent chemical stability, effectively improves the tensile strength, impact resistance and fracture elongation of the product, and reduces the noise of the pipeline.
Compared with the prior art, the invention has the beneficial effects that: compared with the common polyethylene drain pipe, the noise is reduced by 2.5-12.5dB, and the high-strength polyethylene drain pipe still has good impact strength and tensile strength, and meanwhile, the manufacturing process is simple in steps and convenient to use and install.
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.
Example 1
The oblique tee bend tubular product of amortization that this embodiment provided.
The preparation process comprises the following steps:
step one, preparing raw materials,
prepared according to the following dosage:
100kg of PVC resin, 30kg of carboxyl nitrile rubber powder, 20kg of barium sulfate, 30kg of light calcium carbonate, 0.6kg of PE wax, 4.5kg of calcium-zinc stabilizer, 1.1kg of titanium dioxide, 2.0kg of ACR, 0.3kg of stearic acid, 1.5kg of dioctyl ester and 8kg of brightener.
Secondly, putting the prepared raw materials into a high-speed heating mixer (model GRH-3000) for high-speed kneading, and raising the temperature of the raw materials to 120 ℃; cooling the hot mixed and kneaded raw materials in a cooling mixer (model LH-500B) to reduce the temperature of the raw materials to below 40 ℃, and discharging for later use;
plasticizing and granulating, namely putting the mixture discharged in the step two into a granulator, wherein the rotating speed of a main machine of the granulator is 30 revolutions per minute, the temperature of a charging barrel zone of the granulator is 180-190 ℃, and the temperature of a granulating die is 200-210 ℃ to prepare granules with the particle size of 1.5 mm;
step four, extruding:
the above cooled and granulated raw materials were fed into a DAT-85 constant diameter twin screw extruder (DAE-AMICHENRYCO. LTD, Korea) and extruded, and the melt was fed into a phi 110X 3.2mm composite die from a skin feed port 9 to form inner and outer skins, under the process conditions:
the rotating speed of the main machine is as follows: 25rpm, auxiliary machine rotation speed: 34rpm, the torque of the screw is 43 N.m;
step five, cooling and vacuum-shaping the obtained semi-hose;
sixthly, code spraying and printing;
step seven, traction;
step eight, cutting;
and step nine, obtaining a finished product after inspection.
Example 2
Weighing the following raw materials in parts by weight: 110kg of PVC resin, 45kg of carboxyl nitrile rubber powder, 25kg of barium sulfate, 33kg of light calcium carbonate, 1.0kg of PE wax, 5.0kg of calcium-zinc stabilizer, 1.5kg of titanium dioxide, 2.5kg of ACR2.5kg of stearic acid, 2.0kg of dioctyl ester and 10kg of brightener. The preparation method of the silencing inclined tee pipe is the same as that of the embodiment 1.
Example 3
Weighing the following raw materials in parts by weight: 100kg of PVC resin, 35kg of carboxyl nitrile rubber powder, 20kg of barium sulfate, 33kg of light calcium carbonate, 0.6kg of PE wax, 5.0kg of calcium-zinc stabilizer, 1.5kg of titanium dioxide, 2.5kg of ACR, 0.5kg of stearic acid, 1.5kg of dioctyl ester and 8kg of brightener. The preparation method of the silencing inclined tee pipe is the same as that of the embodiment 1.
Example 4
Weighing the following raw materials in parts by weight: 105kg of PVC resin, 35kg of carboxyl nitrile rubber powder, 22kg of barium sulfate, 32kg of light calcium carbonate, 1.0kg of PE wax, 4.5kg of calcium-zinc stabilizer, 1.2kg of titanium dioxide, 2.5kg of ACR, 0.5kg of stearic acid, 2.0kg of dioctyl ester and 10kg of brightener. The preparation method of the silencing inclined tee pipe is the same as that of the embodiment 1.
Example 5
Weighing the following raw materials in parts by weight: 110kg of PVC resin, 40kg of carboxyl nitrile rubber powder, 22kg of barium sulfate, 31kg of light calcium carbonate, 0.8kg of PE wax, 5.0kg of calcium-zinc stabilizer, 1.3kg of titanium dioxide, 2.2kg of ACR, 0.4kg of stearic acid, 2.0kg of dioctyl ester and 8kg of brightener. The preparation method of the silencing inclined tee pipe is the same as that of the embodiment 1.
To further verify barium sulfate (BaSO)4) Calcium carbonate (CaCO)3) And the effects of the carboxyl butyronitrile rubber powder in the invention and the influence of the change of the proportion thereof on other mechanical properties of the PVC mute drainage pipe in the invention are characterized in that 3 comparative examples are as follows:
comparative example 1: common single layer drain pipe of active calcium carbonate (CaCO) as raw material3) 30Kg of carboxylated nitrile rubber powder, 35Kg of carboxylated nitrile rubber powder and 100Kg of PVC, and does not contain barium sulfate (BaSO)4) The composition and the amount of the other raw materials were the same as those in example 1, and a general drain pipe was prepared.
Comparative example 2: the structure, the preparation mold and the preparation process are the same as those of example 1, except that barium sulfate (BaSO) is used4) The dosage is 5Kg, the carboxyl butyronitrile rubber powder is 5Kg, and calcium carbonate (CaCO)3) The dosage is 10Kg, and the dosage of the PVC resin is 110 Kg.
Comparative example 3: the structure, the preparation mold and the preparation process are the same as those of example 1, except that barium sulfate (BaSO) is used4) The dosage is 60Kg, the carboxyl butyronitrile rubber powder is 5Kg, and calcium carbonate (CaCO)3) The dosage is 10Kg, and the dosage of the PVC resin is 20 Kg.
The results of physical property tests on the respective properties of the oblique silencing tee pipes prepared in examples 1 to 5 and comparative examples 1 to 3 are shown in the following table:
table 1: physical property test results for the respective properties of examples 1 to 5 and comparative examples 1 to 3 were carried out:
table 2: results of noise performance test of examples 1 to 5 and comparative examples 1 to 3:
through performance tests, the hush pipe provided by the invention has the advantages that the carboxyl butadiene-acrylonitrile rubber powder with the core-shell structure and the PVC resin are physically crosslinked, the relation between molecular chains is effectively increased, the toughness of the material is improved, the fracture elongation of a solid-wall pipe is improved to 110%, and the tensile strength is improved to 60 Mpa. In the comparison of examples 1 to 5 and comparative examples 1 to 3, with barium sulfate (BaSO)4) The noise reduction is better and better when the dosage is increased, but when the dosage is barium sulfate (BaSO)4) The mechanical property of the pipe is reduced when the amount is increased to a certain degree. When barium sulfate (BaSO)4) When the dosage and the dosage of the PVC resin are kept to be slightly floating at 1:5, the noise reduction effect is optimal. Compared with the common polyethylene drain pipe, the noise is reduced by 2.5-12.5dB, and the high-strength polyethylene drain pipe still has better impact strength and tensile strength.
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 (6)
1. The silencing inclined tee pipe is characterized by comprising the following raw materials in parts by weight: 100 portions of PVC resin, 30 to 45 portions of carboxylic acrylonitrile butadiene rubber powder, 20 to 25 portions of barium sulfate, 30 to 33 portions of light calcium carbonate, 0.6 to 1.0 portion of PE wax, 4.5 to 5.0 portions of calcium zinc stabilizer, 1.1 to 1.5 portions of titanium dioxide, 2.0 to 2.5 portions of ACR, 0.3 to 0.5 portion of stearic acid, 1.5 to 2.0 portions of dioctyl ester and 8 to 10 portions of whitening agent.
2. The sound-absorbing oblique tee pipe of claim 1, which is composed of the following raw materials in parts by weight: 100 parts of PVC resin, 35 parts of carboxyl nitrile rubber powder, 20 parts of barium sulfate, 33 parts of light calcium carbonate, 0.6 part of PE wax, 5.0 parts of calcium-zinc stabilizer, 1.5 parts of titanium dioxide, 2.5 parts of ACR, 0.5 part of stearic acid, 1.5 parts of dioctyl ester and 8 parts of brightener.
3. The sound-absorbing oblique tee pipe material according to claim 1 or 2, wherein 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.
4. The sound-absorbing inclined tee pipe as claimed in 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 silencing mitre pipe according to claim 1 or 2, wherein the brightener is 2,2- (4, 4-distyryl) bisbenzoxazole.
6. A method for producing the silencing mitre pipe according to any one of claims 1 to 5, comprising the steps of:
the method comprises the following steps: mixing the raw materials, weighing the raw materials according to the proportion, putting the raw materials into a material jar of a high-low temperature mixer, carrying out high-temperature mixing, taking out the high-temperature mixture into a cold jar when the temperature of the mixture in the hot jar reaches 120-130 ℃, and discharging the mixed material when the temperature of the mixture in the cold jar 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 charging barrel zone of the granulator is 180-190 ℃, 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 step two 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 area is 160 plus materials, the torque of the screw is 43 N.m, and the pipe blank is extruded;
step four: and (3) carrying out vacuum cooling molding on the pipe, immediately sizing and cooling the pipe blank when the pipe blank is extruded out of the die, putting the extruded pipe blank into a vacuum sizing cooling box, and sizing the blank by adopting an internal pressure external sizing method to prepare the molded pipe.
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2020
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| CN107778691A (en) * | 2016-08-29 | 2018-03-09 | 广西金滩管业科技有限公司 | PVC silencing drainage pipes and its production method |
| CN111040335A (en) * | 2019-12-05 | 2020-04-21 | 河南联塑实业有限公司 | PVC-U internal spiral silencing pipe and preparation method thereof |
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