CN111793297A - Low-temperature brittleness resistant PVC-U flame-retardant electrical casing and preparation method thereof - Google Patents
Low-temperature brittleness resistant PVC-U flame-retardant electrical casing and preparation method thereof Download PDFInfo
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- CN111793297A CN111793297A CN202010524654.XA CN202010524654A CN111793297A CN 111793297 A CN111793297 A CN 111793297A CN 202010524654 A CN202010524654 A CN 202010524654A CN 111793297 A CN111793297 A CN 111793297A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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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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- 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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a low-temperature brittleness resistant PVC-U flame-retardant electrical casing and a preparation method thereof, wherein the PVC-U flame-retardant electrical casing is prepared by mixing PVC resin, calcium carbonate filler, composite stabilizer, ethylene vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, CPE impact modifier, ACR impact modifier, titanium dioxide, modifier and lubricant to form a multi-component mixture, and the formula of the components enables the product to have better strength, better toughness and better low-temperature brittleness, and the impact resistance and the pressure resistance are improved.
Description
Technical Field
The invention relates to the field of building materials, in particular to a PVC-U flame-retardant electrical casing pipe resistant to low-temperature brittleness and a preparation method thereof.
Background
With the rapid development of the building industry, 90 percent of building drainage pipelines in 2010 adopt plastic pipes; 85% of the building rainwater drainage pipeline adopts a plastic pipe; the building threading protective sleeve is made of plastic pipes, and the PVC-U drainage pipe has the advantages of relatively high strength, relatively low price, light weight, durability, easiness in processing, high cost performance and the like, is listed as four-pillar material in the building industry with steel, wood and cement, is widely applied to the building industry, and various novel PVC flame-retardant products are continuously produced.
However, the PVC resin has poor thermal stability and toughness (anti-extrusion property), particularly poor low-temperature toughness and low-temperature impact resistance, and rapidly decreases with the decrease of temperature, and becomes brittle at a temperature lower than 5 ℃, so that the PVC resin is brittle under slight impact, and the service performance and the use field of the PVC resin are seriously influenced.
At present, most PVC-U flame-retardant electrical sleeves have the problem, and many manufacturers adopt two formulas of winter and summer to solve the problem, but the effect is limited, and if other toughening technologies are used for solving the problem, the market price is limited, and the problem cannot be realized.
Disclosure of Invention
Therefore, the PVC-U flame-retardant electrical casing pipe resistant to low-temperature brittleness and the preparation method thereof are needed to be provided. In a first aspect of the present invention, the inventors provide a low temperature brittleness resistant PVC-U flame retardant electrical casing, which is composed of the following components in parts by mass:
to achieve the object of the second aspect of the present invention, the inventors provide a method for preparing a PVC-U flame retardant electrical conduit, comprising the steps of: according to the components and weight parts of the PVC-U flame-retardant electrical casing provided by the first aspect of the invention, PVC resin, calcium carbonate filler, composite stabilizer, ethylene vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, CPE impact modifier, ACR impact modifier, titanium dioxide, modifier and lubricant are sequentially added into a mixer for stirring, wherein the stirring speed is 300r/min-500 r/min; and in the stirring process, heating and hot mixing are carried out at the heating rate of 2-5 ℃/min, the temperature is reduced at the speed of 4-7 ℃/min after being increased to 120 ℃, the temperature is reduced to 45 ℃ to obtain a mixture, and the PVC-U flame-retardant electrical casing is obtained after extrusion molding, vacuum cooling, traction and cutting by adopting a screw extruder.
Different from the prior art, the technical scheme adopts PVC resin, calcium carbonate filling material, ethylene vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, CPE impact modifier, ACR impact modifier and other components to be blended to form a multi-component mixture, and the formula of the components ensures that the product has better strength, better toughness and better low-temperature brittleness, and the impact resistance and the pressure resistance are improved.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the technical means in detail, the following detailed description is given with reference to specific embodiments.
First, a PVC-U flame retardant electrical bushing against low temperature brittleness according to a first aspect of the present invention is explained, which is composed of the following components in parts by mass:
further, the polymerization degree of the PVC resin is 1000-1200, and a PVC 5 type resin can be selected.
Further, the calcium carbonate filler is light calcium carbonate.
Further, the composite stabilizer is one or a mixture of a composite lead stabilizer and an organic tin stabilizer.
Further, the CPE impact modifier has a chlorine content of 34.5 to 36 wt%.
Furthermore, the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 18-24 wt%.
Further, the titanium dioxide is rutile type titanium dioxide.
Further, the lubricant is one of paraffin, polyethylene wax, oxidized polyethylene wax, stearic acid, and monoanhydride ester or a mixture thereof.
Next, a method for preparing a PVC-U flame retardant electrical casing according to a second aspect of the present invention is described, comprising the steps of:
according to the components and the weight ratio of the first aspect of the invention, PVC resin, calcium carbonate filler, composite stabilizer, ethylene vinyl acetate copolymer, CPE impact modifier, ACR impact modifier, titanium pigment, modifier and lubricant are added into a mixer in sequence and stirred at the stirring speed of 300r/min-500 r/min; and in the stirring process, heating and hot mixing are carried out at the heating rate of 2-5 ℃/min, the temperature is reduced at the speed of 4-7 ℃/min after being increased to 120 ℃, the temperature is reduced to 45 ℃ to obtain a mixture, and the PVC-U flame-retardant electrical casing is obtained after extrusion molding, vacuum cooling, traction and cutting by adopting a double-screw extruder.
Further, the barrel temperature of the screw extruder is 170-190 ℃, and the die temperature is 160-200 ℃.
In this embodiment, the ethylene vinyl acetate copolymer has a vinyl acetate content of 18 to 24 wt% and the CPE impact modifier has a chlorine content of 34.5 to 36 wt%. The modifier was purchased from Nanjing collaborative chemical, Inc., model XH-CB 22.
Example 1: the preparation method of the low-temperature brittleness resistant PVC-U flame-retardant electrical casing comprises the following steps:
100 kg of PVC resin, 35 kg of light calcium carbonate, 3.5 kg of composite lead stabilizer, 5 kg of ethylene-vinyl acetate copolymer, 2 kg of acrylonitrile-butadiene-styrene copolymer, 4 kg of CPE impact modifier, 1.5 kg of ACR impact modifier, 2 kg of rutile titanium dioxide, 0.2 kg of modifier and 1.8 kg of paraffin are sequentially added into a mixer for stirring, and the stirring speed is 300r/min-500 r/min; and in the stirring process, heating and hot mixing are carried out at the heating rate of 2-5 ℃/min, the temperature is reduced at the speed of 4-7 ℃/min after being increased to 120 ℃, the temperature is reduced to 45 ℃, and the mixture is obtained after the temperature is reduced to 45 ℃, and the PVC-U flame-retardant electrical casing is obtained after extrusion molding, vacuum cooling, traction and cutting by adopting a double-screw extruder with the cylinder temperature of 170-190 ℃. The temperature of the mould is 160-200 ℃.
Example 2: the preparation method of the low-temperature brittleness resistant PVC-U flame-retardant electrical casing comprises the following steps:
100 kg of PVC resin, 40 kg of light calcium carbonate, 3.8 kg of composite lead stabilizer, 4 kg of ethylene vinyl acetate copolymer, 2 kg of acrylonitrile-butadiene-styrene copolymer, 4 kg of CPE impact modifier, 1.5 kg of ACR impact modifier, 2 kg of rutile titanium dioxide, 0.2 kg of modifier and 2.2 kg of paraffin are sequentially added into a mixer for stirring, and the stirring speed is 300r/min-500 r/min; and in the stirring process, heating and hot mixing are carried out at the heating rate of 2-5 ℃/min, the temperature is reduced at the speed of 4-7 ℃/min after being increased to 120 ℃, the temperature is reduced to 45 ℃, and the mixture is obtained after the temperature is reduced to 45 ℃, and the PVC-U flame-retardant electrical casing is obtained after extrusion molding, vacuum cooling, traction and cutting by adopting a double-screw extruder with the cylinder temperature of 170-190 ℃. The temperature of the mould is 160-200 ℃.
Example 3: the preparation method of the low-temperature brittleness resistant PVC-U flame-retardant electrical casing comprises the following steps:
100 kg of PVC resin, 45 kg of light calcium carbonate, 3.8 kg of composite lead stabilizer, 4 kg of ethylene vinyl acetate copolymer, 2 kg of acrylonitrile-butadiene-styrene copolymer, 4 kg of CPE impact modifier, 1.5 kg of ACR impact modifier, 2 kg of rutile titanium dioxide, 0.2 kg of modifier and 2.4 kg of paraffin are sequentially added into a mixer for stirring, wherein the stirring speed is 300r/min-500 r/min; and in the stirring process, heating and hot mixing are carried out at the heating rate of 2-5 ℃/min, the temperature is reduced at the speed of 4-7 ℃/min after being increased to 120 ℃, the temperature is reduced to 45 ℃, and the mixture is obtained after the temperature is reduced to 45 ℃, and the PVC-U flame-retardant electrical casing is obtained after extrusion molding, vacuum cooling, traction and cutting by adopting a double-screw extruder with the cylinder temperature of 170-190 ℃. The temperature of the mould is 160-200 ℃.
The comparative example differs from example 2 in that: ethylene vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer and modifier were not added, while the CPE impact modifier was added in an amount of 12 kg.
The PVC-U flame-retardant electrical casing prepared in examples 1-3 was subjected to drop impact test (true impact rate at 0 ℃) and compression test according to GB/T14152-:
TABLE 1 drop hammer impact test and compression test data
| Test sample | TIR％ | Load (%) | Unload (%) |
| Example 1 | 0 | 23.2 | 9.1 |
| Example 2 | 0 | 19.6 | 8.2 |
| Example 3 | 0 | 18.8 | 6.9 |
| Comparative example | 5 | 26.1 | 9.8 |
Example 4: the preparation method of the low-temperature brittleness resistant PVC-U flame-retardant electrical casing comprises the following steps:
sequentially adding 90 kg of PVC resin, 30 kg of light calcium carbonate, 3 kg of organic tin stabilizer, 3 kg of ethylene-vinyl acetate copolymer, 2 kg of acrylonitrile-butadiene-styrene copolymer, 3 kg of CPE impact modifier, 1 kg of ACR impact modifier, 1 kg of rutile type titanium dioxide, 0.1 kg of modifier and 1 kg of polyethylene wax into a mixer for stirring, wherein the stirring speed is 300r/min-500 r/min; and in the stirring process, heating and hot mixing are carried out at the heating rate of 2-5 ℃/min, the temperature is reduced at the speed of 4-7 ℃/min after being increased to 120 ℃, the temperature is reduced to 45 ℃, and the mixture is obtained after the temperature is reduced to 45 ℃, and the PVC-U flame-retardant electrical casing is obtained after extrusion molding, vacuum cooling, traction and cutting by adopting a double-screw extruder with the cylinder temperature of 170-190 ℃. The temperature of the mould is 160-200 ℃.
Example 5: the preparation method of the low-temperature brittleness resistant PVC-U flame-retardant electrical casing comprises the following steps:
sequentially adding 110 kg of PVC resin, 20 kg of heavy calcium carbonate, 30 kg of light calcium carbonate, 8 kg of organic tin stabilizer, 8 kg of ethylene vinyl acetate copolymer, 8 kg of acrylonitrile-butadiene-styrene copolymer, 10 kg of CPE impact modifier, 3 kg of ACR impact modifier, 3 kg of rutile titanium dioxide, 2 kg of modifier and 3 kg of stearic acid into a mixer for stirring, wherein the stirring speed is 300r/min-500 r/min; and in the stirring process, heating and hot mixing are carried out at the heating rate of 2-5 ℃/min, the temperature is reduced at the speed of 4-7 ℃/min after being increased to 120 ℃, the temperature is reduced to 45 ℃, and the mixture is obtained after the temperature is reduced to 45 ℃, and the PVC-U flame-retardant electrical casing is obtained after extrusion molding, vacuum cooling, traction and cutting by adopting a double-screw extruder with the cylinder temperature of 170-190 ℃. The temperature of the mould is 160-200 ℃.
The PVC-U flame-retardant electrical casing pipe obtained by the embodiment has good low-temperature toughness, impact resistance and pressure resistance, is not easy to crack in a low-temperature environment, has good product performance, and reduces the construction and use loss of the PVC-U flame-retardant electrical casing pipe in the low-temperature environment.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein or by using equivalent structures or equivalent processes performed in the present specification, and are included in the scope of the present invention.
Claims (9)
1. The PVC-U flame-retardant electrical casing pipe resistant to low-temperature brittleness is characterized by comprising the following components in parts by mass:
2. the PVC-U flame retardant electrical bushing as recited in claim 1, wherein the degree of polymerization of the PVC resin is 1000-1200.
3. The PVC-U flame retardant electrical bushing according to claim 1, wherein the composite stabilizer is one of composite lead stabilizer, organic tin stabilizer or a mixture thereof.
4. The PVC-U flame retardant electrical bushing according to claim 1, wherein the CPE impact modifier has a chlorine content of 34.5 to 36 wt%.
5. The PVC-U flame retardant electrical bushing according to claim 1, wherein the ethylene vinyl acetate copolymer has a vinyl acetate content of 18-24 wt%.
6. The PVC-U flame retardant electrical bushing according to claim 1, wherein the titanium white is rutile type titanium white.
7. The PVC-U flame retardant electrical bushing according to claim 1, wherein the lubricant is one of paraffin wax, polyethylene wax, oxidized polyethylene wax, stearic acid, mono anhydride ester or a mixture thereof.
8. The preparation method of the PVC-U flame-retardant electrical casing is characterized by comprising the following steps of:
the components and the weight portion ratio according to any one of claims 1 to 7 are sequentially added into a mixer for stirring at the stirring speed of 300r/min to 500r/min, wherein the mixer comprises PVC resin, calcium carbonate filler, composite stabilizer, ethylene vinyl acetate copolymer, CPE impact modifier, ACR impact modifier, titanium pigment, modifier and lubricant; and in the stirring process, heating and hot mixing are carried out at the heating rate of 2-5 ℃/min, the temperature is reduced at the speed of 4-7 ℃/min after being increased to 120 ℃, the temperature is reduced to 45 ℃ to obtain a mixture, and the PVC-U flame-retardant electrical casing is obtained after extrusion molding, vacuum cooling, traction and cutting by adopting a screw extruder.
9. The method for preparing a PVC-U flame retardant electrical bushing according to claim 8, wherein the barrel temperature of the screw extruder is 170 ℃ to 190 ℃ and the die temperature is 160 ℃ to 210 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113185786A (en) * | 2021-04-13 | 2021-07-30 | 长春联塑实业有限公司 | Low-temperature weather-resistant PVC composition and preparation method and application thereof |
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|---|---|---|---|---|
| CN1304958A (en) * | 2000-10-26 | 2001-07-25 | 招远市海星塑料厂 | Modified UPVC plastic pipe and its preparing process |
| CN101177512A (en) * | 2006-11-06 | 2008-05-14 | 天津德昊超微新材料有限公司 | Special material for polychloroethylene insulating electrical casing pipe |
| CN105255048A (en) * | 2015-10-30 | 2016-01-20 | 永高股份有限公司 | Preparation method of high-performance environment-friendly U-PVC (unplasticized-polyvinyl chloride) pipe |
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- 2020-06-10 CN CN202010524654.XA patent/CN111793297A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304958A (en) * | 2000-10-26 | 2001-07-25 | 招远市海星塑料厂 | Modified UPVC plastic pipe and its preparing process |
| CN101177512A (en) * | 2006-11-06 | 2008-05-14 | 天津德昊超微新材料有限公司 | Special material for polychloroethylene insulating electrical casing pipe |
| CN105255048A (en) * | 2015-10-30 | 2016-01-20 | 永高股份有限公司 | Preparation method of high-performance environment-friendly U-PVC (unplasticized-polyvinyl chloride) pipe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113185786A (en) * | 2021-04-13 | 2021-07-30 | 长春联塑实业有限公司 | Low-temperature weather-resistant PVC composition and preparation method and application thereof |
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Application publication date: 20201020 |