CN110655707A - Novel low-smoke halogen-free flame-retardant cable material - Google Patents
Novel low-smoke halogen-free flame-retardant cable material Download PDFInfo
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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
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0853—Vinylacetate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
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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
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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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
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
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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
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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
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/18—Spheres
Abstract
The invention relates to a novel low-smoke halogen-free flame-retardant cable material and a preparation method thereof, belonging to the field of manufacturing of wire and cable materials; the flame-retardant cable material is prepared from the following raw materials in parts by mass: ethylene vinyl acetate copolymer and polyethylene blend (EVA/PE): 80-90 parts of a solvent; melamine formaldehyde resin microspheres: 10-20 parts; bentonite: 5-15 parts; aluminum hydroxide: 100-110 parts; a crosslinking agent: 20-30 parts of; plasticizer: 10-20 parts; lubricant: 1-3 parts; antioxidant: 0-2 parts of a solvent; the novel low-smoke halogen-free flame-retardant cable material prepared by the invention has excellent flame retardant property, is low-smoke halogen-free, and meets the performance requirements of cables.
Description
Technical Field
The invention relates to the field of manufacturing of wire and cable materials, in particular to a novel low-smoke halogen-free flame-retardant cable material.
Background
With the wider use of electric wires and cables, the fire hazard brought by common electric wires and cables is more and more prominent, and therefore, the research on the flame retardance of electric wires and cables has become a hot spot of public attention in the current society.
In the existing cable sheath material, a common method for flame retardance is to add a large amount of metal hydrate, such as aluminum hydroxide or magnesium hydroxide, into an insulating sheath. However, these prior methods have not improved the tensile strength and elongation at break of the jacket material, although they improve the flame retardant property of the jacket material.
The specific technology comprises the following steps: chinese patent CN109486064A discloses a moisture-proof polyvinyl chloride flame-retardant cable material and a preparation method thereof, but the polyvinyl chloride adopted in the formula is easy to generate toxicity during combustion, and low smoke and zero halogen cannot be guaranteed.
Chinese patent CN108084550A discloses a low smoke and zero halogen fuel, the addition of hydroxide flame retardant in the technical proposal adopted by the patent is 160-187 wt% of base resin, and excessive inorganic filler can cause the serious reduction of the mechanical property of the material.
The Chinese patent CN1752130A takes nano montmorillonite as a flame retardant synergist, so that the filling amount of hydroxide is reduced, and the processing performance is improved, but the intercalation compound type is mostly adopted for montmorillonite modification, the process is complex, the production cost is high, and the industrial large-scale production is difficult to realize.
Disclosure of Invention
The invention discloses a novel low-smoke halogen-free flame-retardant cable material aiming at the problems in the prior art, the flame-retardant cable material disclosed by the invention is used by combining multi-component ingredients, particularly melamine formaldehyde resin microspheres, bentonite and aluminum hydroxide are used as flame retardants, the melamine formaldehyde resin microspheres, the bentonite and the aluminum hydroxide are used in a matched manner, and the flame-retardant cable material is mixed with other components at a high speed, so that the low-smoke halogen-free flame-retardant cable material has low-smoke halogen-free and excellent flame-retardant performance, and meets the.
The invention is realized by the following steps:
the novel low-smoke halogen-free flame-retardant cable material is characterized by being prepared from the following components in parts by mass: ethylene vinyl acetate copolymer and polyethylene blend (EVA/PE): 80-90 parts of a solvent; melamine formaldehyde resin microspheres: 10-20 parts; bentonite: 5-15 parts; aluminum hydroxide: 100-110 parts; a crosslinking agent: 20-30 parts of; plasticizer: 10-20 parts; lubricant: 1-3 parts; antioxidant: 0-2 parts of. According to the flame-retardant cable material, the melamine formaldehyde resin microspheres, the bentonite and the aluminum hydroxide are used as flame retardants, so that the filling amount of hydroxide is reduced, and the tensile strength and the elongation at break of the cable material are improved while the flame retardance is realized.
Further, the EVA/PE is obtained by uniformly melting and mixing the EVA and the PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min.
Further, the cross-linking agent is dicumyl peroxide.
Further, the plasticizer is dioctyl phthalate.
Further, the lubricant is an organic silicon lubricant.
Further, the antioxidant is one or a combination of more of an antioxidant 1076, an antioxidant 1010 and an antioxidant 168, and the antioxidant performance of the cable material is further enhanced by the selective use of a plurality of antioxidants.
The invention also discloses a preparation method of the novel low-smoke halogen-free flame-retardant cable material, which is characterized by comprising the following steps:
1) and mixing the ethylene-vinyl acetate copolymer with polyethylene blend (EVA/PE): 80-90 parts of a solvent; melamine formaldehyde resin microspheres: 10-20 parts; bentonite: 5-15 parts; aluminum hydroxide: 100-110 parts; a crosslinking agent: 20-30 parts of; plasticizer: 10-20 parts; lubricant: 1-3 parts; antioxidant: 0-2 parts of high-speed mixing for 5-20 seconds;
2) after the mixing of the steps is finished, continuously adding 10-20 parts by mass of plasticizer, and mixing at high speed for 2-10 minutes;
3) when the temperature of the materials in the high-speed mixing equipment reaches 90-110 ℃, discharging the materials by the high-speed mixing equipment;
4) and putting the materials discharged by the high-speed mixing equipment in the step 3) into a double-screw extruder for extrusion and granulation.
Further, the twin-screw temperature of the twin-screw extruder in the step 4) is 130-160 ℃.
Further, the EVA/PE is obtained by uniformly melting and mixing the EVA and the PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant; the antioxidant is one or a combination of more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
Compared with the prior art, the invention has the beneficial effects that:
1) the melamine formaldehyde resin microspheres adopted in the invention can play a role of a flame retardant in the cable material, which is beneficial to expanding the application field of the melamine formaldehyde resin microspheres, the melamine formaldehyde resin microspheres are rarely applied to the cable material in the prior art to be used as the flame retardant, and the use of the components of the cable material has important significance;
2) the flame retardant and mechanical properties can be synergistically regulated and controlled by utilizing the ternary composition of melamine formaldehyde resin microspheres, bentonite and aluminum hydroxide;
3) the invention provides a feasible, low-smoke and halogen-free strategy for preparing the high-performance EVA/PE composite cable material;
4) the performance index of the novel low-smoke halogen-free flame-retardant cable material prepared by the invention meets the relevant standard specification, the whole production and preparation process of the product is simple, the manufacturing cost is reduced, the production efficiency is improved, and the economic benefit is improved.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention more clear, the present invention is further described in detail by the following examples. It should be noted that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Specific examples and comparative examples are listed below to specifically describe:
example 1
The preparation method comprises the following raw materials in parts by mass: ethylene vinyl acetate copolymer and polyethylene blend (EVA/PE): 80 parts of a mixture; melamine formaldehyde resin microspheres: 10 parts of (A); bentonite: 15 parts of (1); aluminum hydroxide: 110 parts of (A); a crosslinking agent: 25 parts of (1); plasticizer: 15 parts of (1); lubricant: 2 parts of (1); antioxidant: 1 part.
The EVA/PE is obtained by uniformly melting and mixing EVA and PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the cross-linking agent is dicumyl peroxide; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant; the antioxidant is one or a combination of more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
The preparation method comprises the following steps:
(1) blending ethylene-vinyl acetate copolymer with polyethylene (EVA/PE): 80 parts of a mixture; melamine formaldehyde resin microspheres: 10 parts of (A); bentonite: 15 parts of (1); aluminum hydroxide: 110 parts of (A); a crosslinking agent: 25 parts of (1); lubricant: 2 parts of (1); antioxidant: 1 part of the mixture is mixed at high speed for 5 to 20 seconds;
2) after the mixing of the steps is finished, continuously adding 15 parts by mass of plasticizer, and mixing at high speed for 10 minutes;
3) when the temperature of the materials in the high-speed mixing equipment reaches 100 ℃, discharging the materials by the high-speed mixing equipment;
4) and putting the materials discharged by the high-speed mixing equipment in the step 3) into a double-screw extruder for extrusion and granulation.
Wherein the temperature of the twin-screw in the step 4) is 156 ℃; the EVA/PE is obtained by uniformly melting and mixing the EVA and the PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant; the antioxidant is one or a combination of more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
Example 2
The preparation method comprises the following raw materials in parts by mass: the method comprises the following raw materials: ethylene vinyl acetate copolymer and polyethylene blend (EVA/PE): 85 parts of a mixture; melamine formaldehyde resin microspheres: 15 parts of (1); bentonite: 10 parts of (A); aluminum hydroxide: 105 parts of (A); a crosslinking agent: 25 parts of (1); plasticizer: 15 parts of (1); lubricant: 2 parts of (1); antioxidant: 1 part.
The EVA/PE is obtained by uniformly melting and mixing EVA and PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the cross-linking agent is dicumyl peroxide; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant; the antioxidant is one or a combination of more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
The preparation method comprises the following steps:
(1) blending ethylene-vinyl acetate copolymer with polyethylene (EVA/PE): 85 parts of a mixture; melamine formaldehyde resin microspheres: 15 parts of (1); bentonite: 10 parts of (A); aluminum hydroxide: 105 parts of (A); a crosslinking agent: 25 parts of (1); lubricant: 2 parts of (1); antioxidant: 1 part of the mixture is mixed at high speed for 5 to 20 seconds;
2) after the mixing of the steps is finished, continuously adding 15 parts by mass of plasticizer, and mixing at high speed for 10 minutes;
3) when the temperature of the materials in the high-speed mixing equipment reaches 100 ℃, discharging the materials by the high-speed mixing equipment;
4) and putting the materials discharged by the high-speed mixing equipment in the step 3) into a double-screw extruder for extrusion and granulation.
Wherein the temperature of the twin-screw in the step 4) is 156 ℃; the EVA/PE is obtained by uniformly melting and mixing the EVA and the PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant; the antioxidant is one or a combination of more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
Example 3
The preparation method comprises the following raw materials in parts by mass: ethylene vinyl acetate copolymer and polyethylene blend (EVA/PE): 90 parts of a mixture; melamine formaldehyde resin microspheres: 20 parts of (1); bentonite: 5 parts of a mixture; aluminum hydroxide: 100 parts of (A); a crosslinking agent: 25 parts of (1); plasticizer: 15 parts of (1); lubricant: 2 parts of (1); antioxidant: 1 part.
The EVA/PE is obtained by uniformly melting and mixing EVA and PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the cross-linking agent is dicumyl peroxide; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant; the antioxidant is one or a combination of more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
The preparation method comprises the following steps:
(1) blending ethylene-vinyl acetate copolymer with polyethylene (EVA/PE): 90 parts of a mixture; melamine formaldehyde resin microspheres: 20 parts of (1); bentonite: 5 parts of a mixture; aluminum hydroxide: 100 parts of (A); a crosslinking agent: 25 parts of (1); lubricant: 2 parts of (1); antioxidant: 1 part of the mixture is mixed at high speed for 5 to 20 seconds;
2) after the mixing of the steps is finished, continuously adding 15 parts by mass of plasticizer, and mixing at high speed for 10 minutes;
3) when the temperature of the materials in the high-speed mixing equipment reaches 100 ℃, discharging the materials by the high-speed mixing equipment;
4) and putting the materials discharged by the high-speed mixing equipment in the step 3) into a double-screw extruder for extrusion and granulation.
Wherein the temperature of the twin-screw in the step 4) is 156 ℃; the EVA/PE is obtained by uniformly melting and mixing the EVA and the PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant; the antioxidant is one or a combination of more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
Example 4
The preparation method comprises the following raw materials in parts by mass: ethylene vinyl acetate copolymer and polyethylene blend (EVA/PE): 90 parts of a mixture; bentonite: 15 parts of (1); aluminum hydroxide: 100 parts of (A); a crosslinking agent: 25 parts of (1); plasticizer: 15 parts of (1); lubricant: 2 parts of (1); antioxidant: 1 part.
The EVA/PE is obtained by uniformly melting and mixing EVA and PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the cross-linking agent is dicumyl peroxide; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant; the antioxidant is one or a combination of more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
The preparation method comprises the following steps:
(1) blending ethylene-vinyl acetate copolymer with polyethylene (EVA/PE): 90 parts of a mixture; bentonite: 15 parts of (1); aluminum hydroxide: 100 parts of (A); a crosslinking agent: 25 parts of (1); lubricant: 2 parts of (1); antioxidant: 1 part of the mixture is mixed at high speed for 5 to 20 seconds;
2) after the mixing of the steps is finished, continuously adding 15 parts by mass of plasticizer, and mixing at high speed for 10 minutes;
3) when the temperature of the materials in the high-speed mixing equipment reaches 100 ℃, discharging the materials by the high-speed mixing equipment;
4) and putting the materials discharged by the high-speed mixing equipment in the step 3) into a double-screw extruder for extrusion and granulation.
Wherein the temperature of the twin-screw in the step 4) is 156 ℃; the EVA/PE is obtained by uniformly melting and mixing the EVA and the PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant; the antioxidant is one or a combination of more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
Example 5
The preparation method comprises the following raw materials in parts by mass: ethylene vinyl acetate copolymer and polyethylene blend (EVA/PE): 90 parts of a mixture; melamine formaldehyde resin microspheres: 10 parts of (A); aluminum hydroxide: 100 parts of (A); a crosslinking agent: 25 parts of (1); plasticizer: 20 parts of (1); lubricant: 2 parts of (1); antioxidant: 1 part.
The EVA/PE is obtained by uniformly melting and mixing EVA and PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the cross-linking agent is dicumyl peroxide; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant; the antioxidant is one or a combination of more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
The preparation method comprises the following steps:
(1) blending ethylene-vinyl acetate copolymer with polyethylene (EVA/PE): 90 parts of a mixture; melamine formaldehyde resin microspheres: 10 parts of (A); aluminum hydroxide: 100 parts of (A); a crosslinking agent: 25 parts of (1); lubricant: 2 parts of (1); antioxidant: 1 part of the mixture is mixed at high speed for 5 to 20 seconds;
2) after the mixing of the steps is finished, continuously adding 20 parts by mass of plasticizer, and mixing at high speed for 10 minutes;
3) when the temperature of the materials in the high-speed mixing equipment reaches 100 ℃, discharging the materials by the high-speed mixing equipment;
4) and putting the materials discharged by the high-speed mixing equipment in the step 3) into a double-screw extruder for extrusion and granulation.
Wherein the temperature of the twin-screw in the step 4) is 156 ℃; the EVA/PE is obtained by uniformly melting and mixing the EVA and the PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant; the antioxidant is one or a combination of more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
Example 6
The preparation method comprises the following raw materials in parts by mass: ethylene vinyl acetate copolymer and polyethylene blend (EVA/PE): 90 parts of a mixture; melamine formaldehyde resin microspheres: 15 parts of (1); bentonite: 15 parts of (1); aluminum hydroxide: 100 parts of (A); a crosslinking agent: 20 parts of (1); plasticizer: 10 parts of (A); lubricant: 1 part.
The EVA/PE is obtained by uniformly melting and mixing EVA and PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the cross-linking agent is dicumyl peroxide; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant.
The preparation method comprises the following steps:
(1) blending ethylene-vinyl acetate copolymer with polyethylene (EVA/PE): 90 parts of a mixture; melamine formaldehyde resin microspheres: 15 parts of (1); bentonite: 15 parts of (1); aluminum hydroxide: 100 parts of (A); a crosslinking agent: 20 parts of (1); plasticizer: 10 parts of (A); lubricant: 1 part of the mixture is mixed at high speed for 5 to 20 seconds;
2) after the mixing of the steps is finished, continuously adding 10 parts by mass of plasticizer, and mixing at high speed for 10 minutes;
3) when the temperature of the materials in the high-speed mixing equipment reaches 100 ℃, discharging the materials by the high-speed mixing equipment;
4) and putting the materials discharged by the high-speed mixing equipment in the step 3) into a double-screw extruder for extrusion and granulation.
Wherein the temperature of the twin-screw in the step 4) is 156 ℃; the EVA/PE is obtained by uniformly melting and mixing the EVA and the PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant.
Example 7
The preparation method comprises the following raw materials in parts by mass: ethylene vinyl acetate copolymer and polyethylene blend (EVA/PE): 90 parts of a mixture; melamine formaldehyde resin microspheres: 10 parts of (A); bentonite: 15 parts of (1); aluminum hydroxide: 100 parts of (A); a crosslinking agent: 30 parts of (1); plasticizer: 10 parts of (A); lubricant: 2 parts of (1); antioxidant: and 2 parts.
The EVA/PE is obtained by uniformly melting and mixing EVA and PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the cross-linking agent is dicumyl peroxide; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant; the antioxidant is one or a combination of more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
The preparation method comprises the following steps:
(1) blending ethylene-vinyl acetate copolymer with polyethylene (EVA/PE): 90 parts of a mixture; melamine formaldehyde resin microspheres: 10 parts of (A); bentonite: 15 parts of (1); aluminum hydroxide: 100 parts of (A); a crosslinking agent: 30 parts of (1); lubricant: 2 parts of (1); antioxidant: 2 parts of the mixture is mixed at high speed for 5 to 20 seconds;
2) after the mixing of the steps is finished, continuously adding 10 parts by mass of plasticizer, and mixing at high speed for 10 minutes;
3) when the temperature of the materials in the high-speed mixing equipment reaches 100 ℃, discharging the materials by the high-speed mixing equipment;
4) and putting the materials discharged by the high-speed mixing equipment in the step 3) into a double-screw extruder for extrusion and granulation.
Wherein the temperature of the twin-screw in the step 4) is 156 ℃; the EVA/PE is obtained by uniformly melting and mixing the EVA and the PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant; the antioxidant is one or a combination of more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
Comparative example
The comparative example comprises the following raw materials in parts by mass: ethylene vinyl acetate copolymer and polyethylene blend (EVA/PE): 90 parts of a mixture; aluminum hydroxide: 100 parts of (A); a crosslinking agent: 25 parts of (1); plasticizer: 15 parts of (1); lubricant: 2 parts of (1); antioxidant: 1 part.
The EVA/PE is obtained by uniformly melting and mixing EVA and PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the cross-linking agent is dicumyl peroxide; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant; the antioxidant is one or a combination of more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
The preparation method comprises the following steps:
(1) blending ethylene-vinyl acetate copolymer with polyethylene (EVA/PE): 90 parts of a mixture; aluminum hydroxide: 100 parts of (A); a crosslinking agent: 25 parts of (1); plasticizer: 2 parts of (1); lubricant: 2 parts of (1); antioxidant: 1 part of the mixture is mixed at high speed for 5 to 20 seconds;
2) after the mixing of the steps is finished, continuously adding 2 parts by mass of plasticizer, and mixing at high speed for 10 minutes;
3) when the temperature of the materials in the high-speed mixing equipment reaches 100 ℃, discharging the materials by the high-speed mixing equipment;
4) and putting the materials discharged by the high-speed mixing equipment in the step 3) into a double-screw extruder for extrusion and granulation.
Wherein the temperature of the twin-screw in the step 4) is 156 ℃; the EVA/PE is obtained by uniformly melting and mixing the EVA and the PE in a mass ratio of 3:2 at 180 ℃ in a torque rheometer with the rotating speed of 60 r/min; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant; the antioxidant is one or a combination of more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
The cable materials prepared in the above examples 1 to 6 and comparative example were subjected to performance tests, and the test results are shown in the following table. Wherein the tensile test method is according to ASTM D-638 standard; the flame retardant properties were tested according to method UL 94-2012.
(1) Tensile properties test results:
(2) UL94 vertical burn test results
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 | Comparative example | |
| Flame retardancy | V-0 | V-0 | V-0 | V-0 | V-0 | V-0 | V-0 | V-0 |
The above table shows that the tensile strength and the flame retardant property of the cable sheath are effectively improved by adding the melamine formaldehyde resin microspheres, the bentonite and the aluminum hydroxide into the EVA/PE cable sheath formula material.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The novel low-smoke halogen-free flame-retardant cable material is characterized by being prepared from the following components in parts by mass: blends of ethylene-vinyl acetate copolymers with polyethylene (EVA/PE): 80-90 parts of a solvent; melamine formaldehyde resin microspheres: 10-20 parts; bentonite: 5-15 parts; aluminum hydroxide: 100-110 parts; a crosslinking agent: 20-30 parts of; plasticizer: 10-20 parts; lubricant: 1-3 parts; antioxidant: 0-2 parts of.
2. The novel low-smoke halogen-free flame-retardant cable material as claimed in claim 1, wherein the EVA/PE is obtained by melting and uniformly mixing EVA and PE in a mass ratio of 3:2 in a torque rheometer at a rotation speed of 60r/min at 180 ℃.
3. The novel low-smoke halogen-free flame-retardant cable material as claimed in claim 1, wherein the crosslinking agent is dicumyl peroxide.
4. The novel low-smoke halogen-free flame-retardant cable material as claimed in claim 1, wherein the plasticizer is dioctyl phthalate.
5. The novel low-smoke halogen-free flame-retardant cable material as claimed in claim 1, wherein the lubricant is an organosilicon lubricant.
6. The novel low-smoke halogen-free flame-retardant cable material as claimed in claim 1, wherein the antioxidant is one or more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
7. The preparation method of the novel low-smoke halogen-free flame-retardant cable material according to any one of claims 1 to 5, characterized in that the method specifically comprises the following steps:
1) weighing the blend of the ethylene-vinyl acetate copolymer and the polyethylene according to the mass parts: 80-90 parts of a solvent;
melamine formaldehyde resin microspheres: 10-20 parts; bentonite: 5-15 parts; aluminum hydroxide: 100-110 parts;
a crosslinking agent: 20-30 parts of a solvent; lubricant: 1-3 parts; antioxidant: 0-2 parts of high-speed mixing for 5-20 seconds;
2) after the mixing in the step 1) is finished, continuously adding 10-20 parts by mass of plasticizer, and mixing at high speed for 2-10 minutes;
3) when the temperature of the materials in the high-speed mixing equipment reaches 90-110 ℃, discharging the materials by the high-speed mixing equipment;
4) and putting the materials discharged by the high-speed mixing equipment in the step 3) into a double-screw extruder for extrusion and granulation.
8. The method for preparing a novel low-smoke halogen-free flame-retardant cable material as claimed in claim 7, wherein the twin-screw temperature of the twin-screw extruder in the step 4) is 130-160 ℃.
9. The preparation method of the novel low-smoke halogen-free flame-retardant cable material according to claim 7, characterized in that the EVA/PE is obtained by mixing EVA and PE in a mass ratio of 3:2, and melting and mixing uniformly in a torque rheometer with a rotation speed of 60r/min at 180 ℃; the plasticizer is dioctyl phthalate; the lubricant is an organic silicon lubricant; the antioxidant is one or a combination of more of antioxidant 1076, antioxidant 1010 and antioxidant 168.
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