CN114230944A - High-toughness easy-to-bend visual electrical casing and preparation method thereof - Google Patents
High-toughness easy-to-bend visual electrical casing and preparation method thereof Download PDFInfo
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- CN114230944A CN114230944A CN202210040718.8A CN202210040718A CN114230944A CN 114230944 A CN114230944 A CN 114230944A CN 202210040718 A CN202210040718 A CN 202210040718A CN 114230944 A CN114230944 A CN 114230944A
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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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention discloses a high-toughness easy-bending visual electrical casing and a preparation method thereof, wherein the high-toughness easy-bending visual electrical casing comprises the following components in parts by mass: 100 parts of PVC resin powder, 1-1.2 parts of external lubricant, 1-1.2 parts of internal lubricant, 0.2-0.4 part of release agent, 1.5-2 parts of impact modifier, 1.5-2.5 parts of stabilizer, 8 parts of MBS resin, 4-8 parts of ethylene-methyl acrylate copolymer, wherein the mass content of methyl acrylate in the ethylene-methyl acrylate copolymer is 18-24%. The sleeve prepared by the invention has stronger toughness, is not easy to whiten and break under the conditions of low temperature, continuous higher temperature and room temperature, and the pipe bending force of the sleeve is improved.
Description
Technical Field
The invention belongs to the technical field of plastic pipeline preparation, and particularly relates to a high-toughness easy-to-bend visual electrical casing and a preparation method thereof.
Background
PVC (i.e., polyvinyl chloride) is one of five general-purpose plastics, and is widely used in the field of cable sheaths because of its advantages of good insulation, nonflammability, low price, corrosion resistance, etc. People pay more and more attention to the cable safety condition hidden in walls and plates in the house decoration process, and therefore the visual line pipe is produced at the same time.
However, due to the characteristics of the high polymer material of PVC, the material is hard and brittle, and is laborious and prone to whitening, wrinkling, breaking and the like when the pipeline is bent, thereby affecting the use. Therefore, some toughening agents are often required to be added in the formula design to improve the toughness of the pipe and reduce the difficulty of bending the pipe.
Some commonly used toughening materials at present comprise nitrile rubber, MBS and the like, and common nitrile rubber is easy to decompose under the action of light, so that the transparency of a PVC product is influenced; the dispersion form of MBS in PVC is similar to sea-island structure, can improve the toughness of the product to a certain extent, but the impact on reducing the pipe bending difficulty is not obvious through the pipe bending test of the formed pipe.
Chinese patent CN102775693A provides a transparent polyvinyl chloride composition and a preparation method thereof, wherein a fully vulcanized powdered rubber with small particle size is used, the obtained transparent polyvinyl chloride not only can be improved in light transmittance, but also has excellent physical and mechanical properties, but also has high haze, and the vulcanized rubber can emit peculiar smell in the processing process, so that the transparent polyvinyl chloride composition is not environment-friendly and healthy.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a high-toughness easy-to-bend visual electrical casing and a preparation method thereof, so as to solve the problems of poor toughness, difficult bending and the like of the existing PVC-U visual conduit.
In order to achieve the purpose, the following technical scheme is provided:
a high-toughness easy-to-bend visual electrical casing comprises the following components in parts by mass: 100 parts of PVC resin powder, 1-1.2 parts of external lubricant, 1-1.2 parts of internal lubricant, 0.2-0.4 part of release agent, 1.5-2 parts of impact modifier, 1.5-2.5 parts of stabilizer, 8 parts of MBS resin and 4-8 parts of ethylene-methyl acrylate copolymer.
Further, the mass content of methyl acrylate in the ethylene-methyl acrylate copolymer is 18-24%, and the PVC resin powder is SG-7 type.
A preparation method of a high-toughness easy-to-bend visual electrical casing comprises the following steps: preparing ethylene-methyl acrylate copolymer, weighing the components according to the mass parts, adding the components at low speed, stirring for preliminary mixing, then adjusting to high-speed stirring and mixing, then discharging to a cold mixer for cooling, transferring to a double-screw extruder after cooling, and carrying out extrusion molding to obtain the product.
Further, the low-speed stirring speed is 300-400 rpm, the high-speed stirring speed is 1100-1300 rpm, the stabilizer is liquid organic tin, and the other formula components are solid materials, so that the solid materials are added firstly and then the organic tin is added in the mixing process, if the solid materials are directly stirred at high speed, the material temperature is rapidly increased after the solid materials are added, the mixing of the organic tin and the components is influenced, the low-speed stirring is firstly carried out, and the high speed is changed after the organic tin is added, so that the components are fully and uniformly stirred.
Further, the low-speed stirring time is 5min, the high-speed stirring time is 15-20min, the high-speed stirring is carried out until the temperature of the materials reaches 100-.
Further, the raw materials are cooled to 40-45 ℃ by a cold mixer, the barrel temperature of a double-screw extruder is 145-160 ℃, the temperature at the outlet of a neck mold is 190-195 ℃, the rotating speed of the double-screw shearing material and extrusion is 15-17r/min, and the rotating speed during feeding is 18-20 r/min.
Further, the specific process for preparing the ethylene-methyl acrylate copolymer is as follows: methyl acrylate monomer and ethylene gas are sprayed into a reactor together, the pressure is maintained at 0.1-0.15MPa, the temperature is maintained at 30-35 ℃, and the ethylene-methyl acrylate copolymer is generated by the reaction under the catalysis of alpha-diamine Pd, and the reaction formula is as follows
The ethylene-methyl acrylate copolymer has the characteristics of good toughness, excellent elasticity, good dimensional stability, excellent electrical property, cold resistance, aging resistance and the like.
Further, the external lubricant is metal soap salt, the internal lubricant is dicarboxylic ester, the release agent is oxidized polyethylene wax, and the impact modifier is ethylene-vinyl acetate block copolymer.
Further, the stabilizer is tin methyl sulfate, tin maleic anhydride or tin laurate.
The invention has the beneficial effects that: the preparation method is simple, and the prepared sleeve has strong toughness and bending force and does not generate whitening fracture and wrinkling at low temperature, room temperature and continuously higher temperature.
Detailed Description
The invention is further illustrated by the following examples, without restricting its scope.
Example 1
Preparing ethylene-methyl acrylate copolymer, injecting methyl acrylate monomer and ethylene gas into a reactor, keeping the pressure at 0.1MPa and the temperature at 30 ℃, reacting under the catalysis of alpha-diamine Pd to generate the ethylene-methyl acrylate copolymer, wherein the mass content of methyl acrylate is 18%, weighing the components according to the mass parts, the components are shown in Table 1, adding the components at a low speed of 300 revolutions per minute, stirring for 5min for preliminary mixing, then adjusting to a high speed of 1100 revolutions per minute for stirring and mixing, stirring for 20min at a high speed, discharging to a cold mixer for cooling to 40 ℃, cooling, transferring to a double-screw extruder, controlling the barrel temperature of the double-screw extruder to 145 ℃, the temperature at the outlet of a double-screw die to 190 ℃, the rotation speed of the double-screw die to 15r/min, and the feeding rotation speed to 18r/min, the product was obtained by extrusion molding, and then the bend test was performed, and the test results are shown in table 2.
Example 2
Preparing ethylene-methyl acrylate copolymer, injecting methyl acrylate monomer and ethylene gas into a reactor, keeping the pressure at 0.11MPa and the temperature at 31 ℃, reacting to generate the ethylene-methyl acrylate copolymer under the catalysis of alpha-diamine Pd, wherein the mass content of methyl acrylate is 19%, weighing the components according to the mass parts, the components are shown in Table 1, adding the components at a low speed of 340 r/min, stirring for 5min for preliminary mixing, then adjusting to a high speed of 1150 r/min, stirring for 15min at a high speed, when the temperature reaches 100 ℃, then discharging the mixture into a cold mixer, cooling to 41 ℃, transferring into a double-screw extruder after cooling, wherein the barrel temperature of the double-screw extruder is 148 ℃, the temperature at a double-screw die outlet is 191 ℃, the rotation speed of 16r/min, and the feeding rotation speed of 19r/min, the product was obtained by extrusion molding, and then the bend test was performed, and the test results are shown in table 2.
Example 3
Preparing ethylene-methyl acrylate copolymer, injecting methyl acrylate monomer and ethylene gas into a reactor, keeping the pressure at 0.12MPa and the temperature at 32 ℃, reacting to generate the ethylene-methyl acrylate copolymer under the catalysis of alpha-diamine Pd, wherein the mass content of methyl acrylate is 20%, weighing the components according to the mass parts, the components are shown in the table 1, adding the components at a low speed of 320 revolutions per minute, stirring for 5min for preliminary mixing, then adjusting to high speed of 1200 revolutions per minute for stirring and mixing, stirring for 18min at a high speed, discharging to a cold mixer for cooling to 42 ℃, cooling, transferring to a double-screw extruder, controlling the barrel temperature of the double-screw extruder to be 150 ℃, controlling the temperature at the outlet of a double-screw die to be 193 ℃, controlling the rotation speed to be 17r/min and controlling the feeding rotation speed to be 20r/min, the product was obtained by extrusion molding, and then the bend test was performed, and the test results are shown in table 2.
Example 4
Preparing ethylene-methyl acrylate copolymer, injecting methyl acrylate monomer and ethylene gas into a reactor, keeping the pressure at 0.13MPa and the temperature at 33 ℃, reacting to generate the ethylene-methyl acrylate copolymer under the catalysis of alpha-diamine Pd, wherein the mass content of methyl acrylate is 21%, weighing the components according to the mass parts, the components are shown in Table 1, adding the components at a low speed of 360 revolutions per minute, stirring for 5min for preliminary mixing, then adjusting to high speed of 1250 revolutions per minute for stirring and mixing, stirring for 16min at a high speed, the temperature reaches 109 ℃, then discharging the materials into a cold mixer, cooling to 43 ℃, transferring into a double-screw extruder, controlling the barrel temperature of the double-screw extruder to 155 ℃, the temperature at a neck mold outlet to 194 ℃, the rotation speed of the double screw to 16r/min and the feeding rotation speed to 18r/min, the product was obtained by extrusion molding, and then the bend test was performed, and the test results are shown in table 2.
Example 5
Preparing ethylene-methyl acrylate copolymer, injecting methyl acrylate monomer and ethylene gas into a reactor, keeping the pressure at 0.14MPa and the temperature at 34 ℃, reacting to generate the ethylene-methyl acrylate copolymer under the catalysis of alpha-diamine Pd, wherein the mass content of methyl acrylate is 22%, weighing the components according to the mass parts, the components are shown in the table 1, adding the components at 380 r/min of low speed, stirring for 5min, preliminarily mixing, adjusting to 1300 r/min of high speed, stirring for 15min at high speed, the temperature reaches 107 ℃, discharging to a cold mixer, cooling to 44 ℃, transferring to a double-screw extruder, cooling, controlling the barrel temperature of the double-screw extruder to 160 ℃, controlling the temperature at the outlet of a neck mold to 195 ℃, controlling the rotation speed of the double screws to 17r/min, and controlling the feeding rotation speed to 20r/min, the product was obtained by extrusion molding, and then the bend test was performed, and the test results are shown in table 2.
Example 6
Preparing ethylene-methyl acrylate copolymer, injecting methyl acrylate monomer and ethylene gas into a reactor, keeping the pressure at 0.15MPa and the temperature at 35 ℃, reacting to generate the ethylene-methyl acrylate copolymer under the catalysis of alpha-diamine Pd, wherein the mass content of methyl acrylate is 23%, weighing the components according to the mass parts, the components are shown in the table 1, adding the components at the low speed of 400 r/min, stirring for 5min, preliminarily mixing, adjusting to the high speed of 1300 r/min, stirring for 17min at the high speed, discharging to a cold mixer, cooling to 45 ℃, transferring to a double-screw extruder, cooling, controlling the barrel temperature of the double-screw extruder to 160 ℃, controlling the temperature at the outlet of a double-screw die to 190 ℃, controlling the rotation speed of 15r/min and controlling the feeding rotation speed to 18r/min, the product was obtained by extrusion molding, and then the bend test was performed, and the test results are shown in table 2.
Example 7
Preparing ethylene-methyl acrylate copolymer, injecting methyl acrylate monomer and ethylene gas into a reactor, keeping the pressure at 0.1MPa and the temperature at 30 ℃, reacting under the catalysis of alpha-diamine Pd to generate the ethylene-methyl acrylate copolymer, wherein the mass content of methyl acrylate is 24%, weighing each component according to the mass parts, the components are shown in Table 1, adding each component at the low speed of 350 r/min, stirring for 5min for preliminary mixing, then adjusting to high speed of 1200 r/min, stirring for 16min at the high speed, discharging to a cold mixer, cooling to 45 ℃, transferring to a double-screw extruder, cooling, wherein the barrel temperature of the double-screw extruder is 155 ℃, the temperature at the outlet of a double-screw die is 193 ℃, the rotation speed of 16r/min, and the feeding rotation speed of 19r/min, the product was obtained by extrusion molding, and then the bend test was performed, and the test results are shown in table 2.
Example 8
Preparing ethylene-methyl acrylate copolymer, injecting methyl acrylate monomer and ethylene gas into a reactor, keeping the pressure at 0.1MPa and the temperature at 30 ℃, reacting under the catalysis of alpha-diamine Pd to generate the ethylene-methyl acrylate copolymer, wherein the mass content of methyl acrylate is 18%, weighing the components according to the mass parts, the components are shown in Table 1, adding the components at a low speed of 300 revolutions per minute, stirring for 5min for preliminary mixing, then adjusting to a high speed of 1150 revolutions per minute for stirring and mixing, stirring for 20min at a high speed, discharging to a cold mixer for cooling to 40 ℃, cooling, transferring to a double-screw extruder, controlling the barrel temperature of the double-screw extruder to 145 ℃, the temperature at the outlet of a double-screw die to 190 ℃, the rotation speed of 15r/min and the feeding rotation speed to 17r/min, the product was obtained by extrusion molding, and then the bend test was performed, and the test results are shown in table 2.
Example 9
Preparing ethylene-methyl acrylate copolymer, injecting methyl acrylate monomer and ethylene gas into a reactor, keeping the pressure at 0.1MPa and the temperature at 30 ℃, reacting under the catalysis of alpha-diamine Pd to generate the ethylene-methyl acrylate copolymer, wherein the mass content of methyl acrylate is 18%, weighing the components according to the mass parts, the components are shown in Table 1, adding the components at the low speed of 350 revolutions per minute, stirring for 5min for preliminary mixing, then adjusting to high speed of 1100 revolutions per minute for stirring and mixing, stirring for 20min at the high speed, discharging to a cold mixer for cooling to 40 ℃, cooling, transferring to a double-screw extruder, controlling the barrel temperature of the double-screw extruder to 145 ℃, the temperature at the outlet of a double-screw die to 190 ℃, the rotation speed of 15r/min and the feeding rotation speed of 17r/min, the product was obtained by extrusion molding, and then the bend test was performed, and the test results are shown in table 2.
TABLE 1 compounding ratio of each component in examples
Table 2 comparison of the properties of the sleeves prepared in the examples with those of commercially available sleeves
The low-temperature elbow test in the table refers to the elbow test of the sleeve under the conditions of-5 ℃, 10 ℃ and-15 ℃, the oven treatment refers to the elbow test of the sleeve under the condition of 50 ℃ for 1, 3, 5 and 7 days, and the room-temperature elbow refers to the elbow test under the room-temperature condition, and the invention is detected according to the standard of the GB/T9341-2000 plastic bending property test method.
As can be seen from the table, the addition amount of the ethylene-methyl acrylate copolymer is too low, the pipe modification result is not obvious, and the addition amount is too high, on one hand, the cost is increased too much, and on the other hand, the compression resistance of the product is reduced.
The metal soap salt is one or more of G78, G70 and G74; the PVC resin powder manufacturer is SG-7, and the type of the ethylene-vinyl acetate block copolymer is 741; the MBS resin is one or a plurality of compounds of B513, B621, B625 and B635.
And (4) conclusion: the sleeve prepared by the invention can be free from whitening wrinkling and fracture under the conditions of low temperature, continuously higher temperature and room temperature, while the sleeve sold in the market is seriously whitened and fractured at low temperature, slightly whitened at continuously higher temperature and fractured at room temperature, and the toughness of the sleeve sold in the market is inferior to that of the sleeve prepared by the invention.
Claims (9)
1. The high-toughness easy-to-bend visual electrical casing is characterized by comprising the following components in parts by mass: 100 parts of PVC resin powder, 1-1.2 parts of external lubricant, 1-1.2 parts of internal lubricant, 0.2-0.4 part of release agent, 1.5-2 parts of impact modifier, 1.5-2.5 parts of stabilizer, 8 parts of MBS resin and 4-8 parts of ethylene-methyl acrylate copolymer.
2. The high-toughness easy-to-bend visual electrical casing according to claim 1, wherein the mass content of methyl acrylate in the ethylene-methyl acrylate copolymer is 18-24%, and the PVC resin powder is SG-7 type.
3. The preparation method of the high-toughness easy-bending visual electrical casing pipe according to claim 1, characterized by comprising the following steps of: preparing ethylene-methyl acrylate copolymer, weighing the components according to the mass parts, adding the components at low speed, stirring for preliminary mixing, then adjusting to high-speed stirring and mixing, then discharging to a cold mixer for cooling, transferring to a double-screw extruder after cooling, and carrying out extrusion molding to obtain the product.
4. The method for preparing the high-toughness easy-bending visual electrical casing according to claim 3, wherein the low-speed stirring speed is 300-.
5. The preparation method of the high-toughness easy-bending visual electrical casing according to claim 4, wherein the low-speed stirring time is 5min, the high-speed stirring time is 15-20min, and the high-speed stirring is carried out until the temperature of the material reaches 100-.
6. The preparation method of the high-toughness easy-bending visual electrical casing pipe as claimed in claim 3, wherein the raw materials are cooled to 40-45 ℃ by a cold mixer, the barrel temperature of a double-screw extruder is 145-160 ℃, the temperature at the outlet of a neck mold is 190-195 ℃, the rotating speed of the double-screw shearing material and extrusion is 15-17r/min, and the rotating speed during feeding is 18-20 r/min.
7. The preparation method of the high-toughness easy-bending visual electrical casing according to claim 3, wherein the specific process for preparing the ethylene-methyl acrylate copolymer comprises the following steps: methyl acrylate monomer and ethylene gas are sprayed into a reactor together, the pressure is maintained at 0.1-0.15MPa, the temperature is maintained at 30-35 ℃, and the ethylene-methyl acrylate copolymer is generated by reaction under the catalysis of alpha-diamine Pd.
8. The method for preparing a high-toughness easily bendable visual electrical casing according to claim 1, wherein the external lubricant is a metal soap salt, the internal lubricant is a dicarboxylic acid ester, the release agent is oxidized polyethylene wax, and the impact modifier is an ethylene-vinyl acetate block copolymer.
9. The method for preparing a high-toughness easy-bending visual electrical casing according to claim 1, wherein the stabilizer is tin methyl sulfate, tin maleic anhydride or tin laurate.
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Cited By (1)
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