CN106188965A - A kind of heat-resistant fireproof anti-aging PVC tubing and preparation method thereof - Google Patents
A kind of heat-resistant fireproof anti-aging PVC tubing and preparation method thereof Download PDFInfo
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- CN106188965A CN106188965A CN201610638445.1A CN201610638445A CN106188965A CN 106188965 A CN106188965 A CN 106188965A CN 201610638445 A CN201610638445 A CN 201610638445A CN 106188965 A CN106188965 A CN 106188965A
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- aging
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/82—Heating or cooling
- B29B7/823—Temperature control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- 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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a kind of heat-resistant fireproof anti-aging PVC tubing, component including following mass fraction: 70～90 parts of PVC resin powder, 20～50 parts of filleies, 1～3 part of heat stabilizer, 0.5～1 part of ACR resin, 2～4 parts of CPE, 0.3～0.5 part of lubricant, 0.2～0.5 part of white carbon black, 0.5～1 part of aluminium hydroxide, 1～4 part of fire retardant and 0.1～0.2 part of age resister, preparation method includes mixing, extrusion, sizing, cools down and cut.Heat-resistant fireproof anti-aging PVC tubing of the present invention, has higher heat resistance and anti-flammability by the PVC prepared of each component, there remains bigger hot strength in the Xenon lamp weather resistance test of long period.
Description
Technical field
The invention belongs to polyvinyl chloride composite materials technical field, especially relate to a kind of heat-resistant fireproof anti-aging PVC
Tubing and preparation method thereof.
Background technology
One of product as development in science and technology, PVC in daily life conspicuous can and.At present, PVC is because having
The features such as corrosion resistance is strong, high intensity, good rigidly, are widely used in the technical fields such as feedwater, building, draining, blowdown, are one
Plant the scope of application and be only second to the plastic pipe of polyethylene, but owing to PVC wears no resistance, and it is old to accelerate it in high temperature environments
Change, constrain the use of PVC to a great extent.
Summary of the invention
In view of this, it is contemplated that propose a kind of heat-resistant fireproof anti-aging PVC tubing, it is provided that a kind of low cost, resistance to
The PVC material that high temperature is effective, fire resistance is high and ageing resistace is strong.
For reaching above-mentioned purpose, the technical scheme is that and be achieved in that:
A kind of heat-resistant fireproof anti-aging PVC tubing, including the component of following mass fraction: 70～90 parts of PVC resin powder,
20～50 parts of filleies, 1～3 part of heat stabilizer, 0.5～1 part of ACR resin, 2～4 parts of CPE, 0.3～0.5 part of lubricant, 0.2
～0.5 part of white carbon black, 0.5～1 part of aluminium hydroxide, 1～4 part of fire retardant and 0.1～0.2 part of age resister.
Preferably, described PVC resin powder is SG-5 type PVC resin powder.
Preferably, one or both during described filler is precipitated calcium carbonate or activated Calcium carbonate.
Preferably, described filler is precipitated calcium carbonate and activated Calcium carbonate, and both mass fractions are than being (1～3):
(1～2).
Preferably, described heat stabilizer is organic tin heat stabilizer.
Preferably, one or both during described heat stabilizer is dibutyl tin laurate or dibutyitin maleate.
Preferably, described lubricant is stearic acid and paraffin, and both mass fractions are than being (1～2): (2～3).
Preferably, described fire retardant is eight bromo ether and melamine cyanurate, and both mass fractions than for 1:(2～
3)。
Preferably, described age resister is plastic anti-aging agent.
Dibutyl tin laurate: a kind of organotin additive, can be dissolved in benzene, toluene, carbon tetrachloride, ethyl acetate, chlorine
The organic solvents such as imitative, acetone, petroleum ether and all industry plasticizers, water insoluble.The high boiling point multipurpose circulated on the market has
Machine tin catalyst dibutyl tin laurate the most all processes through special liquefaction, is light yellow or colorless oil under room temperature
Liquid, low temperature becomes white crystals body, can be used for igelite auxiliary agent, has excellent lubricity, transparent, weatherability.
Dibutyitin maleate: these product are the heat stabilizer of polrvinyl chloride, has excellent thermostability and the transparency, without sulfur
Changing contaminative, long-term heat resistance is especially good, is possible to prevent the goods when high temperature process to turn yellow.
Eight bromo ether: a kind of white powder, low toxicity, dissolves in benzene, acetone, chloroform etc., water insoluble and alcohol, decomposition temperature
More than 285 DEG C, being the major product of tetrabromobisphenol deep processing, flame retardant effect is more preferable.Eight bromo ether, as additive flame retardant, is one
Plant and not only contain aromatic series bromine but also contain the efficient flame-retarding agent of aliphatic bromine, have fabulous heat stability and light stability.Main use
In polypropylene, polystyrene, polystyrene resin, Corvic, resin.
Melamine cyanurate: 1,3,5-triazine-2,4,6 (1H, 3H, 5H)-triketone and 1,3,5-triazine-2,4,6-triamine
Compound；Melamine cyanurate；Cyanurate tripolycyanamide ester.For rubber, nylon, polyurethane, phenolic resin, epoxy resin,
Polyvinyl resin, acrylic acid fire-retardant.
White carbon black: one of purposes is that preventing ultraviolet is aging in plastics industry, owing to white carbon black has a higher light absorptive, thus energy
Effectively prevent plastics from being irradiated by sunlight and producing photooxidative degradation.White carbon black is as the risen work of UV light stabilizing agent
With having: luminous energy is converted into heat energy；Frosting is protected to exempt from the roentgenization of certain wavelength；Intercept atomic group and produce anti-
Aging action, thus stop catalytic degradation.Ultraviolet is particularly detrimental to polyolefin, and test proof works as the dense of the white carbon black of certain fineness
Perfect ultraviolet screener effect can be reached when degree is 2 percent.
Plastic anti-aging agent is to effectively absorb the ultraviolet light that wavelength is 270～380 nanometers, is mainly used in unsaturated tree
In fat and the goods containing unsaturated-resin.Superpower ultraviolet absorption ability；Effectively prevent ultraviolet to the injury of skin and cause
Carcinous, increase substantially the ageing resistace of product.
The preparation method of a kind of heat-resistant fireproof anti-aging PVC tubing, comprises the following steps: by raw material at high speed blender
In mix, including cold mixed two steps of heat mixing, the mixed temperature of described heat is 60～80 DEG C, and the temperature of described cold roller is normal
Temperature；Mixed raw material is passed through extruder, heats in an extruder, and heating-up temperature is 160～200 DEG C, then by squeezing
Go out mould to extrude raw material to calibration sleeve, carry out cutting and i.e. obtain product after then passing through room temperature cooling.
Relative to prior art, heat-resistant fireproof anti-aging PVC tubing of the present invention has the advantage that
Heat-resistant fireproof anti-aging PVC tubing of the present invention, is had by the PVC prepared of each component
There are higher heat resistance and anti-flammability, the Xenon lamp weather resistance test of long period there remains bigger hot strength.
Detailed description of the invention
Unless otherwise indicated, term used herein is respectively provided with the implication that those skilled in the art's routine understands, in order to
Readily appreciate the present invention, terms more used herein have been carried out following definitions.
All of Digital ID, such as pH, temperature, time, concentration, including scope, be all approximation.It is to be understood that, although
Term " about " is all added before all of Digital ID of the clearest and the most definite narration.Simultaneously it will also be understood that, although the clearest and the most definite
Narration, reagent described herein is only example, and its equivalent is known in the art.
The present invention is described in detail below in conjunction with embodiment.
Comparative example
A kind of heat-resistant fireproof anti-aging PVC tubing, including the component of following mass fraction: 72 parts of SG-5 type polyvinyl chloride resins
Powder, 26 parts of precipitated calcium carbonates, 1.5 parts of dibutyl tin laurates, 0.6 part of ACR resin, 2.4 parts of CPE, 0.15 part of stearic acid,
0.2 part of paraffin, 0.3 part of white carbon black and 0.5 part of aluminium hydroxide.
Preparation method: mixed in high speed blender by raw material, including cold mixed two steps of heat mixing, described heat is mixed
Temperature be 80 DEG C, the temperature of described cold roller is room temperature；Mixed raw material is passed through extruder, heats in an extruder,
Heating-up temperature is 180 DEG C, is then extruded raw material to calibration sleeve by extrusion die, cuts after then passing through room temperature cooling
Obtain product.
The physical property of the PVC material prepared by this comparative example is as shown in table 1.
Embodiment 1
A kind of heat-resistant fireproof anti-aging PVC tubing, including the component of following mass fraction: 72 parts of SG-5 type polyvinyl chloride resins
Powder, 26 parts of precipitated calcium carbonates, 1.5 parts of dibutyl tin laurates, 0.6 part of ACR resin, 2.4 parts of CPE, 0.15 part of stearic acid,
0.2 part of paraffin, 0.3 part of white carbon black, 0.5 part of aluminium hydroxide, 0.5 part of eight bromo ether, 1.5 parts of melamine cyanurates and 0.1 part of plastics
Age resister.
Preparation method: mixed in high speed blender by raw material, including cold mixed two steps of heat mixing, described heat is mixed
Temperature be 80 DEG C, the temperature of described cold roller is room temperature；Mixed raw material is passed through extruder, heats in an extruder,
Heating-up temperature is 180 DEG C, is then extruded raw material to calibration sleeve by extrusion die, cuts after then passing through room temperature cooling
Obtain product.
The physical property of the PVC material prepared by the present embodiment is as shown in Tables 1 and 2.
Embodiment 2
A kind of heat-resistant fireproof anti-aging PVC tubing, including the component of following mass fraction: 78 parts of SG-5 type polyvinyl chloride resins
Powder, 34 parts of activated Calcium carbonates, 2.1 parts of dibutyl tin laurates, 0.7 part of ACR resin, 4 parts of CPE, 0.1 part of stearic acid, 0.2 part
Paraffin, 0.4 part of white carbon black, 0.6 part of aluminium hydroxide, 0.75 part of eight bromo ether, 1.25 parts of melamine cyanurates and 0.13 part of plastics resist
Aging dose.
Preparation method: mixed in high speed blender by raw material, including cold mixed two steps of heat mixing, described heat is mixed
Temperature be 80 DEG C, the temperature of described cold roller is room temperature；Mixed raw material is passed through extruder, heats in an extruder,
Heating-up temperature is 180 DEG C, is then extruded raw material to calibration sleeve by extrusion die, cuts after then passing through room temperature cooling
Obtain product.
The physical property of the PVC material prepared by the present embodiment is as shown in Tables 1 and 2.
Embodiment 3
A kind of heat-resistant fireproof anti-aging PVC tubing, including the component of following mass fraction: 85 parts of SG-5 type polyvinyl chloride resins
Powder, 40 parts of precipitated calcium carbonates, 2 parts of dibutyitin maleate, 0.7 part of ACR resin, 3 parts of CPE, 0.2 part of stearic acid, 0.2 part of stone
Wax, 0.45 part of white carbon black, 0.6 part of aluminium hydroxide, 1 part of eight bromo ether, 2 parts of melamine cyanurates and 0.2 part of plastic anti-aging agent.
Preparation method: mixed in high speed blender by raw material, including cold mixed two steps of heat mixing, described heat is mixed
Temperature be 80 DEG C, the temperature of described cold roller is room temperature；Mixed raw material is passed through extruder, heats in an extruder,
Heating-up temperature is 180 DEG C, is then extruded raw material to calibration sleeve by extrusion die, cuts after then passing through room temperature cooling
Obtain product.
The physical property of the PVC material prepared by the present embodiment is as shown in Tables 1 and 2.
Embodiment 4
A kind of heat-resistant fireproof anti-aging PVC tubing, including the component of following mass fraction: 80 parts of SG-5 type polyvinyl chloride resins
Powder, 20 parts of precipitated calcium carbonates, 23 activated Calcium carbonates, 1.2 parts of dibutyitin maleate, 1.4 dibutyl tin laurates, 0.9 part
ACR resin, 4 parts of CPE, 0.15 part of stearic acid, 0.25 part of paraffin, 0.3 part of white carbon black, 0.6 part of aluminium hydroxide, 1.3 parts of eight bromo ethers,
2.2 parts of melamine cyanurates and 0.2 part of plastic anti-aging agent.
Preparation method: mixed in high speed blender by raw material, including cold mixed two steps of heat mixing, described heat is mixed
Temperature be 80 DEG C, the temperature of described cold roller is room temperature；Mixed raw material is passed through extruder, heats in an extruder,
Heating-up temperature is 180 DEG C, is then extruded raw material to calibration sleeve by extrusion die, cuts after then passing through room temperature cooling
Obtain product.
The physical property of the PVC material prepared by the present embodiment is as shown in Tables 1 and 2.
Heat-resistant fireproof anti-aging PVC tubing that table 1 comparative example and embodiment 1～4 prepare and preparation method thereof
Vicat softening temperature and oxygen index (OI) OI
| Test event | Comparative example | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 |
| Vicat softening temperature (DEG C) | 82 | 88 | 87 | 88 | 85 |
| Oxygen index (OI) OI (%) | 24 | 31 | 34 | 32 | 30 |
The heat-resistant fireproof anti-aging PVC pipe that under table 2 Xenon lamp weather resistance test, comparative example and embodiment 1～4 prepare
The hot strength of material and preparation method thereof
Data from table 1 and 2 it can be seen that the PVC material enumerated in embodiment 1～4 on vicat softening temperature and
The experimental data of the numeric ratio comparative example of oxygen index (OI) OI is big, it can be seen that the PVC material of the present invention high temperature resistant and fire-retardant
There is significant raising；Xenon lamp weather resistance test the Data Comparison of hot strength can be seen that the PVC material of the present invention exists
Bigger lifting has been had in ageing resistace.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (10)
1. a heat-resistant fireproof anti-aging PVC tubing, it is characterised in that: include the component of following mass fraction: 70～90 parts
PVC resin powder, 20～50 parts of filleies, 1～3 part of heat stabilizer, 0.5～1 part of ACR resin, 2～4 parts of CPE, 0.3～0.5 part
Lubricant, 0.2～0.5 part of white carbon black, 0.5～1 part of aluminium hydroxide, 1～4 part of fire retardant and 0.1～0.2 part of age resister.
Heat-resistant fireproof anti-aging PVC tubing the most according to claim 1, it is characterised in that: described PVC resin powder is
SG-5 type PVC resin powder.
Heat-resistant fireproof anti-aging PVC tubing the most according to claim 1, it is characterised in that: described filler is lightweight
One or both in calcium carbonate or activated Calcium carbonate.
Heat-resistant fireproof anti-aging PVC tubing the most according to claim 1 and 2, it is characterised in that: described filler is light
Matter calcium carbonate and activated Calcium carbonate, and both mass fractions are than being (1～3): (1～2).
Heat-resistant fireproof anti-aging PVC tubing the most according to claim 1, it is characterised in that: described heat stabilizer is for having
Machine stannum type thermal stabilizing agent.
Heat-resistant fireproof anti-aging PVC tubing the most according to claim 1 or 5, it is characterised in that: described heat stabilizer is
One or both in dibutyl tin laurate or dibutyitin maleate.
Heat-resistant fireproof anti-aging PVC tubing the most according to claim 1, it is characterised in that: described lubricant is stearic
Acid and paraffin, and both mass fractions are than for (1～2): (2～3).
Heat-resistant fireproof anti-aging PVC tubing the most according to claim 1, it is characterised in that: described fire retardant is eight bromines
Ether and melamine cyanurate, and both mass fractions are than for 1:(2～3).
Heat-resistant fireproof anti-aging PVC tubing the most according to claim 1, it is characterised in that: described age resister is for moulding
Material age resister.
10. the method preparing heat-resistant fireproof anti-aging PVC tubing as claimed in any one of claims 1 to 9 wherein, it is special
Levy and be: comprise the following steps: raw material is mixed in high speed blender, including cold mixed two steps of heat mixing, described
The temperature that heat is mixed is 60～80 DEG C, and the temperature of described cold roller is room temperature；Mixed raw material is passed through extruder, enters in an extruder
Row heating, heating-up temperature is 160～200 DEG C, is then extruded raw material to calibration sleeve by extrusion die, then passes through room temperature cold
Carry out the most afterwards cutting i.e. obtaining product.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610638445.1A CN106188965A (en) | 2016-08-04 | 2016-08-04 | A kind of heat-resistant fireproof anti-aging PVC tubing and preparation method thereof |
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| CN201610638445.1A CN106188965A (en) | 2016-08-04 | 2016-08-04 | A kind of heat-resistant fireproof anti-aging PVC tubing and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107141659A (en) * | 2017-07-03 | 2017-09-08 | 魏科峰 | Polyvinyl chloride heat-resistant fireproof composite material and preparation method thereof |
| CN107325435A (en) * | 2017-06-26 | 2017-11-07 | 周小红 | High-temperature resistant plastic pipes and preparation method thereof |
| CN109749291A (en) * | 2017-11-05 | 2019-05-14 | 丹阳市贝尔特橡塑制品有限公司 | A kind of flame-proof PVC pipe |
| CN113308051A (en) * | 2021-07-19 | 2021-08-27 | 安徽徽一通讯科技有限公司 | High-temperature-resistant and anti-aging electric power pipe and manufacturing method thereof |
| CN114857845A (en) * | 2022-04-29 | 2022-08-05 | 宁国市惠丰塑料制品有限公司 | Color refrigerator frame |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107325435A (en) * | 2017-06-26 | 2017-11-07 | 周小红 | High-temperature resistant plastic pipes and preparation method thereof |
| CN107141659A (en) * | 2017-07-03 | 2017-09-08 | 魏科峰 | Polyvinyl chloride heat-resistant fireproof composite material and preparation method thereof |
| CN109749291A (en) * | 2017-11-05 | 2019-05-14 | 丹阳市贝尔特橡塑制品有限公司 | A kind of flame-proof PVC pipe |
| CN113308051A (en) * | 2021-07-19 | 2021-08-27 | 安徽徽一通讯科技有限公司 | High-temperature-resistant and anti-aging electric power pipe and manufacturing method thereof |
| CN114857845A (en) * | 2022-04-29 | 2022-08-05 | 宁国市惠丰塑料制品有限公司 | Color refrigerator frame |
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Application publication date: 20161207 |