CN112080088A - Preparation method of insulating polyvinyl chloride cable protection pipe - Google Patents

Preparation method of insulating polyvinyl chloride cable protection pipe Download PDF

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Publication number
CN112080088A
CN112080088A CN202010966659.8A CN202010966659A CN112080088A CN 112080088 A CN112080088 A CN 112080088A CN 202010966659 A CN202010966659 A CN 202010966659A CN 112080088 A CN112080088 A CN 112080088A
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China
Prior art keywords
cable protection
polyvinyl chloride
parts
fibrilia
extruding
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Inventor
严立万
黄书琴
陈苏焕
黄义山
张庆结
林晓超
黄晓丹
梁璋富
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Zhonggong Hengsheng Technology Co ltd
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Zhonggong Hengsheng Technology Co ltd
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Priority to CN202010966659.8A priority Critical patent/CN112080088A/en
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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
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
    • C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
    • H02G3/0406—Details thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
    • H02G3/0406—Details thereof
    • H02G3/0412—Heat or fire protective means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
    • H02G3/0462—Tubings, i.e. having a closed section
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use 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; Derivatives of such polymers
    • C08J2327/02—Characterised by the use 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; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/04—Characterised by the use 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; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08J2327/06—Homopolymers or copolymers of vinyl chloride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2401/02—Cellulose; Modified cellulose
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2427/00—Characterised by the use 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; Derivatives of such polymers
    • C08J2427/02—Characterised by the use 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; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2427/04—Characterised by the use 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; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08J2427/06—Homopolymers or copolymers of vinyl chloride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
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    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2455/00—Characterised by the use of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08J2423/00 - C08J2453/00
    • C08J2455/02—Acrylonitrile-Butadiene-Styrene [ABS] polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2467/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
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    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
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    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/18—Applications used for pipes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils

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  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
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  • Compositions Of Macromolecular Compounds (AREA)
  • Insulated Conductors (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)

Abstract

The invention relates to the technical field of pipe production, in particular to a preparation method of an insulated polyvinyl chloride cable protection pipe; the method comprises the following steps: step 1: blending fibrilia, ethanolamine phosphate and polylactic acid in a molten state, and extruding and granulating in a double-screw extruder to obtain a heat-conducting auxiliary agent; step 2: blending the heat-conducting auxiliary agent prepared in the step 1 with polyvinyl chloride with the polymerization degree of 1400-1500, polyacrylate, ABS resin grafted and modified by methylene succinic anhydride and a filler, and extruding and granulating in a double-screw extruder; and step 3: and (3) blending the granules prepared in the step (2) with polyvinyl chloride with the polymerization degree of 2000-2200, and extruding in a pipe extruder to prepare the cable protection pipe. The cable protection pipe has excellent heat-conducting property under the condition of ensuring the insulativity of the pipe.

Description

Preparation method of insulating polyvinyl chloride cable protection pipe
Technical Field
The invention relates to the technical field of pipe production, in particular to a preparation method of an insulating polyvinyl chloride cable protection pipe.
Background
The cable is at the transmission of electricity in-process, can produce the heat, lead to the cable conductor temperature to rise, if the plastic casing heat conductivity is poor, be difficult to in time with heat discharge, then can lead to the cable conductor temperature further to rise, thereby reduce the current-carrying capacity of cable conductor, consequently, can add the metal in the raw materials of cable protection pipe and improve its heat conductivility, but use metal material to improve the heat conductivility of cable protection pipe and can reduce the insulating nature of cable protection pipe, consequently, need urgent research and development one kind and improve the insulating nature scheme of cable protection pipe under the prerequisite that satisfies cable protection pipe heat conductivity demand.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the preparation method of the insulating polyvinyl chloride cable protection pipe is provided, so that the prepared cable protection pipe has excellent heat conductivity and insulating property.
In order to solve the technical problems, the invention adopts the technical scheme that:
a preparation method of an insulated polyvinyl chloride cable protection pipe comprises the following steps:
step 1: blending 2-3 parts of fibrilia, 0.4-0.6 part of ethanolamine phosphate and 3-6 parts of polylactic acid in a molten state, and extruding and granulating in a double-screw extruder to obtain a heat-conducting auxiliary agent;
step 2: mixing the heat-conducting auxiliary agent prepared in the step 1 with 55-65 parts of polyvinyl chloride with the polymerization degree of 1400-1500, 10-20 parts of polyacrylate, 12-15 parts of methylene succinic anhydride graft modified ABS resin and 11-13 parts of filler, and extruding and granulating in a double-screw extruder;
and step 3: and (3) blending the granules prepared in the step (2) with 35-45 parts of polyvinyl chloride with the polymerization degree of 2000-2200, and extruding the mixture in a pipe extruder to prepare the cable protection pipe.
The invention has the beneficial effects that:
the invention utilizes waste, uses cheap fibrilia as the heat-conducting auxiliary material of the cable protection pipe, the heat conduction auxiliary agent of the invention takes fibrilia as a main raw material and is melted and blended with the phosphoethanolamine and the polylactic acid in a specific proportion, can improve the fire resistance and the fiber network structure of the fibrilia, particularly, the fibrilia and the polylactic acid form an irregular fiber network connection structure after being combined, can prevent the fibrilia from melting and dropping, because the surface of the polylactic acid is dehydrated after the phosphoethanolamine is heated, the non-volatile phosphorus oxide and the polyphosphoric acid are generated to cover the surface of the irregular fiber network and can prevent oxygen from entering, the generated polyphosphoric acid can dehydrate and carbonize irregular fibers, so that fibrilia forms a carbonized fiber network, and heat and oxygen can be prevented from entering, so that the structural strength and the flame retardance of the fibrilia are improved;
the polyacrylic ester and the ABS resin grafted and modified by the methylene succinic anhydride are blended, so that carboxyl on the surface of the methylene succinic anhydride and alcoholic hydroxyl in fibrilia are subjected to esterification reaction, the polarity and the water absorption of the fibrilia are reduced, the polyvinyl chloride and the fibrilia have excellent compatibility, the polyvinyl chloride with the polymerization degree of 1400-1500 is combined with the heat-conducting auxiliary agent and other modified materials, so that the fibrilia in the heat-conducting auxiliary agent can be uniformly combined with the polyvinyl chloride and the modified materials, the temperature resistance, the rigidity and the toughness of the cable protection pipe can be improved, the fibrilia can be uniformly distributed in obtained granules after the mixing extrusion granulation of the components in the step 2, and then the obtained granules are blended with the polyvinyl chloride with the polymerization degree of 2000-2200, the cable protection pipe is obtained by a pipe extrusion machine, and the polyvinyl chloride with high polymerization degree has excellent rigidity and toughness, and 3, the granular materials obtained in the step 2 are blended, so that the distribution uniformity of the fibrilia in the pipe is ensured, the mechanical property of the cable protection pipe can be improved, the insulativity of the pipe is ensured, and the cable protection pipe has excellent heat-conducting property under the condition of ensuring the insulativity.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description will be given with reference to the embodiments.
The invention provides a preparation method of an insulated polyvinyl chloride cable protection pipe, which comprises the following steps:
step 1: blending 2-3 parts of fibrilia, 0.4-0.6 part of ethanolamine phosphate and 3-6 parts of polylactic acid in a molten state, and extruding and granulating in a double-screw extruder to obtain a heat-conducting auxiliary agent;
step 2: mixing the heat-conducting auxiliary agent prepared in the step 1 with 55-65 parts of polyvinyl chloride with the polymerization degree of 1400-1500, 10-20 parts of polyacrylate, 12-15 parts of methylene succinic anhydride graft modified ABS resin and 11-13 parts of filler, and extruding and granulating in a double-screw extruder;
and step 3: and (3) blending the granules prepared in the step (2) with 35-45 parts of polyvinyl chloride with the polymerization degree of 2000-2200, and extruding the mixture in a pipe extruder to prepare the cable protection pipe.
The invention utilizes waste, uses cheap fibrilia as the heat-conducting auxiliary material of the cable protection pipe, the heat conduction auxiliary agent of the invention takes fibrilia as a main raw material and is melted and blended with the phosphoethanolamine and the polylactic acid in a specific proportion, can improve the fire resistance and the fiber network structure of the fibrilia, particularly, the fibrilia and the polylactic acid form an irregular fiber network connection structure after being combined, can prevent the fibrilia from melting and dropping, because the surface of the polylactic acid is dehydrated after the phosphoethanolamine is heated, the non-volatile phosphorus oxide and the polyphosphoric acid are generated to cover the surface of the irregular fiber network and can prevent oxygen from entering, the generated polyphosphoric acid can dehydrate and carbonize irregular fibers, so that fibrilia forms a carbonized fiber network, and heat and oxygen can be prevented from entering, so that the structural strength and the flame retardance of the fibrilia are improved;
the polyacrylic ester and the ABS resin grafted and modified by the methylene succinic anhydride are blended, so that carboxyl on the surface of the methylene succinic anhydride and alcoholic hydroxyl in fibrilia are subjected to esterification reaction, the polarity and the water absorption of the fibrilia are reduced, the polyvinyl chloride and the fibrilia have excellent compatibility, the polyvinyl chloride with the polymerization degree of 1400-1500 is combined with the heat-conducting auxiliary agent and other modified materials, so that the fibrilia in the heat-conducting auxiliary agent can be uniformly combined with the polyvinyl chloride and the modified materials, the temperature resistance, the rigidity and the toughness of the cable protection pipe can be improved, the fibrilia can be uniformly distributed in obtained granules after the mixing extrusion granulation of the components in the step 2, and then the obtained granules are blended with the polyvinyl chloride with the polymerization degree of 2000-2200, the cable protection pipe is obtained by a pipe extrusion machine, and the polyvinyl chloride with high polymerization degree has excellent rigidity and toughness, and 3, the granular materials obtained in the step 2 are blended, so that the distribution uniformity of the fibrilia in the pipe is ensured, the mechanical property of the cable protection pipe can be improved, the insulativity of the pipe is ensured, and the cable protection pipe has excellent heat-conducting property under the condition of ensuring the insulativity.
Further, in the above method for preparing an insulating polyvinyl chloride cable protection tube, before step 1, the method further comprises step 01: washing and drying the fibrilia, grinding the fibrilia into powder, heating the fibrilia to 500-550 ℃, preserving heat for 3-4h, and cooling the fibrilia to below 40 ℃.
From the above description, the fibrilia is pretreated, and before the fibrilia is melted with the ethanolamine phosphate and the polylactic acid, the fibrilia is carbonized at the low temperature of 500-550 ℃, so that the fibrilia can be subsequently and completely formed into a carbonized fiber network, oxygen can be further prevented from entering, and the flame retardance of the fibrilia can be further improved.
Further, in the above preparation method of the insulating polyvinyl chloride cable protection tube, in the step 01, the hemp fiber is specifically one or a mixture of two or more of ramie fiber, jute fiber, flax fiber and sisal fiber.
The specific variety of the fibrilia can be various fibrilia, wherein the preferable fibrilia is ramie fiber which has better compatibility with polyvinyl chloride, so that the prepared cable protection pipe has better mechanical property.
Further, in the preparation method of the insulating polyvinyl chloride cable protection pipe, the filler is a mixture of calcium carbonate and attapulgite according to a ratio of 1: 1.
The attapulgite is a crystalline hydrated magnesium aluminum silicate mineral, the crystal contains sodium ions, calcium ions, ferric ions and aluminum ions in variable quantities, the metal ions also have certain heat-conducting property, a filler prepared by mixing calcium carbonate and the attapulgite according to the ratio of 1: 1 can be better combined with polyvinyl chloride under specific polymerization degree, the mixture can improve the flame retardance of the cable protection tube, the mechanical property of the cable protection tube is improved in an auxiliary mode, and the heat-conducting property of a cable protection tube cannot be influenced.
The preparation method of the filler comprises the following steps: calcining a mixed material of calcium carbonate and attapulgite according to the ratio of 1: 1 at the temperature of 500 ℃ and 520 ℃ for 3-4 hours, taking out, adding 3-4% of sodium hydroxide solution, grinding for 2.5-3 hours, adjusting the pH value to be neutral, filtering, drying to obtain powder, adding 3% of nano jade powder, 4% of tea tree essential oil and 3% of zinc oxide into the obtained powder, grinding for 1-2 hours together, adding 4% of aminopropyltriethoxysilane and 4% of polyethylene glycol, and dispersing uniformly at the high speed of 10000 r/min to obtain the filler.
In the preparation method of the filler, after the calcium carbonate and the attapulgite are calcined and ground, a certain amount of jade powder, tea tree essential oil and zinc oxide are added for common grinding, and aminopropyl triethoxysilane and polyethylene glycol are added, so that the prepared filler has excellent wear resistance and can supplement gaps between fibrilia and polyvinyl chloride resin, the prepared cable protection pipe has better structural strength, flame retardation of the cable protection pipe can be prevented, and better flame retardance is realized.
Further, in the above method for preparing an insulating polyvinyl chloride cable protection tube, before the step 01, the method further comprises the step 001: soaking the fibrilia in 0.1mol/L potassium hydroxide solution for 3 h.
It can be known from the above description that after the fibrilia is soaked in the potassium hydroxide solution, the pectin and hemicellulose of the fibrilia can be removed, so that the compatibility between the fibrilia and the polyvinyl chloride is improved.
Further, in the preparation method of the insulating polyvinyl chloride cable protection tube, the step 2 specifically comprises: and (2) mixing the heat-conducting auxiliary agent prepared in the step (1) with 55-65 parts of polyvinyl chloride with the polymerization degree of 1400-1500, 10-20 parts of polyacrylate, 2-4 parts of benzoic acid, 12-15 parts of methylene succinic anhydride graft modified ABS resin and 11-13 parts of filler, and extruding and granulating in a double-screw extruder.
As can be seen from the above description, the compatibility between the hemp fiber and the polyvinyl chloride can be further improved by adding a certain amount of benzoic acid to the granulation raw material in step 2.
Further, in the above preparation method of the insulating polyvinyl chloride cable protection tube, in the step 3, the conditions for preparing the cable protection tube by extruding through the tube extruder are specifically as follows: the temperature of the first zone of the cylinder is 140-170 ℃, the temperature of the second zone of the cylinder is 170-180 ℃, the temperature of the third zone of the cylinder is 180-190 ℃, the temperature of the fourth zone of the cylinder is 170-190 ℃, the temperature of the 5 zone of the cylinder is 140-150 ℃ and the extrusion molding speed is 1.5 m/min.
Example 1
A preparation method of an insulated polyvinyl chloride cable protection pipe comprises the following steps:
step 001: soaking the fibrilia in 0.1mol/L potassium hydroxide solution for 3h, wherein the fibrilia is ramie.
Step 01: washing and drying fibrilia, grinding into powder, heating to 500 deg.C, keeping the temperature for 3h, and cooling to below 40 deg.C;
step 1: 2-3 parts of fibrilia treated in the step 01, 0.4-0.6 part of ethanolamine phosphate and 3-6 parts of polylactic acid are blended in a molten state, and are extruded and granulated in a double-screw extruder to obtain a heat-conducting auxiliary agent; the conditions of extruding and granulating by a double-screw extruder are as follows: the working temperature of the first zone is 130-;
step 2: mixing the heat-conducting auxiliary agent prepared in the step 1 with 55-65 parts of polyvinyl chloride with the polymerization degree of 1400-1500, 10-20 parts of polyacrylate, 2 parts of benzoic acid, 12-15 parts of methylene succinic anhydride graft modified ABS resin and 11-13 parts of filler, and extruding and granulating in a double-screw extruder; the conditions of extruding and granulating by a double-screw extruder are as follows: the working temperature of the first zone is 130-;
the preparation method of the filler comprises the following steps: calcining a mixed material of calcium carbonate and attapulgite according to the ratio of 1: 1 at the temperature of 500-520 ℃ for 3-4 hours, taking out, adding 3-4% of sodium hydroxide solution, grinding for 2.5-3 hours, adjusting the pH value to be neutral, filtering, drying to obtain powder, then adding 3% of nano jade powder and 4% of tea tree essential oil, namely 3% of zinc oxide into the obtained powder, grinding for 1-2 hours together, adding 4% of aminopropyltriethoxysilane and 4% of polyethylene glycol, namely 10000 r/min, and uniformly dispersing at a high speed to prepare the filler;
the attapulgite is a crystalline hydrated magnesium aluminum silicate mineral, the crystal contains sodium ions, calcium ions, ferric ions and aluminum ions in variable amounts, the metal ions also have certain heat conduction performance, the filler prepared by the method through the mixture of calcium carbonate and the attapulgite according to the ratio of 1: 1 can be better combined with polyvinyl chloride under specific polymerization degree, the mixture can improve the flame retardance of the cable protection tube, the modified structure of the cable protection tube is more stable, and the rigidity of the cable protection tube is further improved.
And step 3: blending the granules prepared in the step 2 with 35-45 parts of polyvinyl chloride with the polymerization degree of 2000-2200, and extruding the mixture in a pipe extruder to prepare a cable protection pipe; the conditions for preparing the cable protection pipe by extruding the pipe material by the pipe material extruder are as follows: the temperature of the first zone of the cylinder is 140-170 ℃, the temperature of the second zone of the cylinder is 170-180 ℃, the temperature of the third zone of the cylinder is 180-190 ℃, the temperature of the fourth zone of the cylinder is 170-190 ℃, the temperature of the 5 zone of the cylinder is 140-150 ℃ and the extrusion molding speed is 1.5 m/min.
Example 2
A preparation method of an insulated polyvinyl chloride cable protection pipe comprises the following steps:
step 001: soaking the fibrilia in 0.1mol/L potassium hydroxide solution for 3h, wherein the fibrilia is ramie.
Step 01: washing and drying fibrilia, grinding into powder, heating to 550 ℃, keeping the temperature for 4h, and cooling to below 40 ℃;
step 1: 2-3 parts of fibrilia treated in the step 01, 0.4-0.6 part of ethanolamine phosphate and 3-6 parts of polylactic acid are blended in a molten state, and are extruded and granulated in a double-screw extruder to obtain a heat-conducting auxiliary agent; the conditions of extruding and granulating by a double-screw extruder are as follows: the working temperature of the first zone is 130-;
step 2: mixing the heat-conducting auxiliary agent prepared in the step 1 with 55-65 parts of polyvinyl chloride with the polymerization degree of 1400-1500, 10-20 parts of polyacrylate, 4 parts of benzoic acid, 12-15 parts of methylene succinic anhydride graft modified ABS resin and 11-13 parts of filler, and extruding and granulating in a double-screw extruder; the conditions of extruding and granulating by a double-screw extruder are as follows: the working temperature of the first zone is 130-;
the preparation method of the filler comprises the following steps: calcining a mixed material of calcium carbonate and attapulgite according to the ratio of 1: 1 at the temperature of 500-520 ℃ for 3-4 hours, taking out, adding 3-4% of sodium hydroxide solution, grinding for 2.5-3 hours, adjusting the pH value to be neutral, filtering, drying to obtain powder, then adding 3% of nano jade powder and 4% of tea tree essential oil, namely 3% of zinc oxide into the obtained powder, grinding for 1-2 hours together, adding 4% of aminopropyltriethoxysilane and 4% of polyethylene glycol, namely 10000 r/min, and uniformly dispersing at a high speed to prepare the filler;
the attapulgite is a crystalline hydrated magnesium aluminum silicate mineral, the crystal contains sodium ions, calcium ions, ferric ions and aluminum ions in variable amounts, the metal ions also have certain heat conduction performance, the filler prepared by the method through the mixture of calcium carbonate and the attapulgite according to the ratio of 1: 1 can be better combined with polyvinyl chloride under specific polymerization degree, the mixture can improve the flame retardance of the cable protection tube, the modified structure of the cable protection tube is more stable, and the rigidity of the cable protection tube is further improved.
And step 3: blending the granules prepared in the step 2 with 35-45 parts of polyvinyl chloride with the polymerization degree of 2000-2200, and extruding the mixture in a pipe extruder to prepare a cable protection pipe; the conditions for preparing the cable protection pipe by extruding the pipe material by the pipe material extruder are as follows: the temperature of the first zone of the cylinder is 140-170 ℃, the temperature of the second zone of the cylinder is 170-180 ℃, the temperature of the third zone of the cylinder is 180-190 ℃, the temperature of the fourth zone of the cylinder is 170-190 ℃, the temperature of the 5 zone of the cylinder is 140-150 ℃ and the extrusion molding speed is 1.5 m/min.
Example 3
A preparation method of an insulated polyvinyl chloride cable protection pipe comprises the following steps:
step 01: washing and drying hemp fibers, grinding the hemp fibers into powder, heating the powder to 520 ℃, preserving heat for 3 hours, and cooling the powder to below 40 ℃, wherein the hemp fibers are sisal fibers;
step 1: 2-3 parts of fibrilia treated in the step 01, 0.4-0.6 part of ethanolamine phosphate and 3-6 parts of polylactic acid are blended in a molten state, and are extruded and granulated in a double-screw extruder to obtain a heat-conducting auxiliary agent; the conditions of extruding and granulating by a double-screw extruder are as follows: the working temperature of the first zone is 130-;
step 2: mixing the heat-conducting auxiliary agent prepared in the step 1 with 55-65 parts of polyvinyl chloride with the polymerization degree of 1400-1500, 10-20 parts of polyacrylate, 12-15 parts of methylene succinic anhydride graft modified ABS resin and 11-13 parts of filler, and extruding and granulating in a double-screw extruder; the conditions of extruding and granulating by a double-screw extruder are as follows: the working temperature of the first zone is 130-;
the preparation method of the filler comprises the following steps: calcining a mixed material of calcium carbonate and attapulgite according to the ratio of 1: 1 at the temperature of 500-520 ℃ for 3-4 hours, taking out, adding 3-4% of sodium hydroxide solution, grinding for 2.5-3 hours, adjusting the pH value to be neutral, filtering, drying to obtain powder, then adding 3% of nano jade powder and 4% of tea tree essential oil, namely 3% of zinc oxide into the obtained powder, grinding for 1-2 hours together, adding 4% of aminopropyltriethoxysilane and 4% of polyethylene glycol, namely 10000 r/min, and uniformly dispersing at a high speed to prepare the filler;
the attapulgite is a crystalline hydrated magnesium aluminum silicate mineral, the crystal contains sodium ions, calcium ions, ferric ions and aluminum ions in variable amounts, the metal ions also have certain heat conduction performance, the filler prepared by the method through the mixture of calcium carbonate and the attapulgite according to the ratio of 1: 1 can be better combined with polyvinyl chloride under specific polymerization degree, the mixture can improve the flame retardance of the cable protection tube, the modified structure of the cable protection tube is more stable, and the rigidity of the cable protection tube is further improved.
And step 3: blending the granules prepared in the step 2 with 35-45 parts of polyvinyl chloride with the polymerization degree of 2000-2200, and extruding the mixture in a pipe extruder to prepare a cable protection pipe; the conditions for preparing the cable protection pipe by extruding the pipe material by the pipe material extruder are as follows: the temperature of the first zone of the cylinder is 140-170 ℃, the temperature of the second zone of the cylinder is 170-180 ℃, the temperature of the third zone of the cylinder is 180-190 ℃, the temperature of the fourth zone of the cylinder is 170-190 ℃, the temperature of the 5 zone of the cylinder is 140-150 ℃ and the extrusion molding speed is 1.5 m/min.
The cable protection pipes prepared in the above examples 1 to 3 were subjected to performance testing; the cable protection pipes used for detection all had a diameter of 30cm and a thickness of 1 cm.
The conditions of the drop hammer impact test are (20 ℃, 1.5kg and 1.5m), wherein the hydrostatic test is carried out according to the GB/T18742.1-2002 standard, the tensile strength test is carried out according to the GB/T1040.1-2018 standard, the bending elastic modulus is tested according to the GB/T9341-2008 standard, the notch impact strength test is carried out according to the GB/T1043-2008 standard, and the results are shown in Table 1:
table 1: results of mechanical Property testing
Figure BDA0002682578480000091
As can be seen from table 1, the cable protection pipes obtained in examples 1 to 3 all had excellent rigidity and toughness. In the embodiment 1 and the embodiment 2, a pretreatment step of potassium hydroxide soaking of the fibrilia is added, a certain amount of benzoic acid is added in the step 2, and the selected fibrilia is the ramie fiber, so that the prepared cable protection pipe achieves better mechanical properties.
The cable protection pipes obtained in examples 1 to 3 were tested for dielectric constant using a keysight E5063A (265) dielectric constant tester at 25 ℃ at 5GHz, wherein the cable protection pipes obtained in example 1 had a dielectric constant of 6.3, the cable protection pipes obtained in example 2 had a dielectric constant of 5.8, and the cable protection pipes obtained in example 3 had a dielectric constant of 5.3, and it was found that the cable protection pipes obtained in examples 1 to 3 all had excellent insulation properties.
The cable protection tubes obtained in examples 1 to 3 were tested for thermal conductivity, wherein the thermal conductivity of the cable protection tube obtained in example 1 was 0.58W/m · °, the thermal conductivity of the cable protection tube obtained in example 1 was 0.54W/m · ° and the thermal conductivity of the cable protection tube obtained in example 1 was 0.51W/m · °; as can be seen from the above, the cable protection pipes obtained in examples 1 to 3 all had excellent thermal conductivity.
In conclusion, the invention utilizes waste, uses cheap fibrilia as the heat conduction auxiliary material of the cable protection pipe, the heat conduction auxiliary agent of the invention takes fibrilia as a main raw material and is melted and blended with the phosphoethanolamine and the polylactic acid in a specific proportion, can improve the fire resistance and the fiber network structure of the fibrilia, particularly, the fibrilia and the polylactic acid form an irregular fiber network connection structure after being combined, can prevent the fibrilia from melting and dropping, because the surface of the polylactic acid is dehydrated after the phosphoethanolamine is heated, the non-volatile phosphorus oxide and the polyphosphoric acid are generated to cover the surface of the irregular fiber network and can prevent oxygen from entering, the generated polyphosphoric acid can dehydrate and carbonize irregular fibers, so that fibrilia forms a carbonized fiber network, and heat and oxygen can be prevented from entering, so that the structural strength and the flame retardance of the fibrilia are improved;
the polyacrylic ester and the ABS resin grafted and modified by the methylene succinic anhydride are blended, so that carboxyl on the surface of the methylene succinic anhydride and alcoholic hydroxyl in fibrilia are subjected to esterification reaction, the polarity and the water absorption of the fibrilia are reduced, the polyvinyl chloride and the fibrilia have excellent compatibility, the polyvinyl chloride with the polymerization degree of 1400-1500 is combined with the heat-conducting auxiliary agent and other modified materials, so that the fibrilia in the heat-conducting auxiliary agent can be uniformly combined with the polyvinyl chloride and the modified materials, the temperature resistance, the rigidity and the toughness of the cable protection pipe can be improved, the fibrilia can be uniformly distributed in obtained granules after the mixing extrusion granulation of the components in the step 2, and then the obtained granules are blended with the polyvinyl chloride with the polymerization degree of 2000-2200, the cable protection pipe is obtained by a pipe extrusion machine, and the polyvinyl chloride with high polymerization degree has excellent rigidity and toughness, and 3, the granular materials obtained in the step 2 are blended, so that the distribution uniformity of the fibrilia in the pipe is ensured, the mechanical property of the cable protection pipe can be improved, the insulativity of the pipe is ensured, and the cable protection pipe has excellent heat-conducting property under the condition of ensuring the insulativity. After the fibrilia is soaked in the potassium hydroxide solution, the colloid and the hemicellulose of the fibrilia can be removed, so that the compatibility between the fibrilia and the polyvinyl chloride is improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention in the specification or directly or indirectly applied to the related technical field are included in the scope of the present invention.

Claims (8)

1. A preparation method of an insulated polyvinyl chloride cable protection pipe is characterized by comprising the following steps:
step 1: blending 2-3 parts of fibrilia, 0.4-0.6 part of ethanolamine phosphate and 3-6 parts of polylactic acid in a molten state, and extruding and granulating in a double-screw extruder to obtain a heat-conducting auxiliary agent;
step 2: mixing the heat-conducting auxiliary agent prepared in the step 1 with 55-65 parts of polyvinyl chloride with the polymerization degree of 1400-1500, 10-20 parts of polyacrylate, 12-15 parts of methylene succinic anhydride graft modified ABS resin and 11-13 parts of filler, and extruding and granulating in a double-screw extruder;
and step 3: and (3) blending the granules prepared in the step (2) with 35-45 parts of polyvinyl chloride with the polymerization degree of 2000-2200, and extruding the mixture in a pipe extruder to prepare the cable protection pipe.
2. The method for preparing an insulated polyvinyl chloride cable protection tube according to claim 1, further comprising, before the step 1, a step 01: washing and drying the fibrilia, grinding the fibrilia into powder, heating the fibrilia to 500-550 ℃, preserving heat for 3-4h, and cooling the fibrilia to below 40 ℃.
3. The method for preparing an insulated polyvinyl chloride cable protection tube according to claim 2, wherein in the step 01, the hemp fiber is one or more of ramie fiber, jute fiber, flax fiber or sisal fiber.
4. The method for preparing an insulated polyvinyl chloride cable protection tube according to claim 1, wherein the filler is a mixture of calcium carbonate and attapulgite in a ratio of 1: 1.
5. The method for preparing an insulated polyvinyl chloride cable protection tube according to claim 2, further comprising the step 001 of: soaking the fibrilia in 0.1mol/L potassium hydroxide solution for 3 h.
6. The method for preparing an insulated polyvinyl chloride cable protection tube according to claim 1, wherein the step 2 is specifically: and (2) mixing the heat-conducting auxiliary agent prepared in the step (1) with 55-65 parts of polyvinyl chloride with the polymerization degree of 1400-1500, 10-20 parts of polyacrylate, 2-4 parts of benzoic acid, 12-15 parts of methylene succinic anhydride graft modified ABS resin and 11-13 parts of filler, and extruding and granulating in a double-screw extruder.
7. The method for preparing an insulated polyvinyl chloride cable protection tube according to claim 1, wherein in the step 3, the conditions for preparing the cable protection tube by extruding through the tube extruder are specifically as follows: the temperature of the first zone of the cylinder is 140-170 ℃, the temperature of the second zone of the cylinder is 170-180 ℃, the temperature of the third zone of the cylinder is 180-190 ℃, the temperature of the fourth zone of the cylinder is 170-190 ℃, the temperature of the 5 zone of the cylinder is 140-150 ℃ and the extrusion molding speed is 1.5 m/min.
8. The insulated polyvinyl chloride cable protection tube manufactured by the method for manufacturing the insulated polyvinyl chloride cable protection tube according to any one of claims 1 to 7.
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