CN114149649A - High-strength insulating cpvc material and preparation method thereof - Google Patents
High-strength insulating cpvc material and preparation method thereof Download PDFInfo
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- CN114149649A CN114149649A CN202111678257.9A CN202111678257A CN114149649A CN 114149649 A CN114149649 A CN 114149649A CN 202111678257 A CN202111678257 A CN 202111678257A CN 114149649 A CN114149649 A CN 114149649A
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Abstract
The invention relates to the technical field of cpvc, in particular to a high-strength insulating cpvc material and a preparation method thereof. The invention not only realizes the cooperative toughening of the inorganic rigid body and the organic elastomer to the cpvc, but also carries out optimized structure adjustment on the dispersion condition of the filler by the innovative combination of the selection and modification methods of the filler, thereby improving the thermal conductivity, reducing the cost and ensuring the insulativity, and having great application prospect as a cable material.
Description
Technical Field
The invention relates to the technical field of cpvc, in particular to a high-strength insulating cpvc material and a preparation method thereof.
Background
Polyvinyl chloride, a thermoplastic, is polymerized from vinyl chloride monomer under the action of initiators (azo compounds, peroxides, etc.) and light and heat according to a free radical reaction mechanism, and is abbreviated as PVC. The CPVC resin is an important modified variety of PVC resin, is prepared by taking PVC resin as a raw material through chlorination reaction, has complex distribution of chlorine atoms on carbon chains due to different substitution positions of the chlorine atoms on molecular chains, and has a chemical structure equivalent to a ternary random copolymer of vinyl chloride, 1-dichloroethylene and 1, 2-dichloroethylene. The chlorine content is obviously higher than that of PVC, the heat resistance is better, and the flame retardant self-extinguishing PVC material also has excellent mechanical property, flame retardant self-extinguishing property, aging resistance, weather resistance and the like. But in the chlorination process, besides the substitution reaction, some side reactions can also occur, so that the CPVC molecular chain has abnormal structures such as head-head structures, unsaturated double bond structures, unstable chlorine structures, branched chains and the like, the excessively high chlorine content causes hydrogen chloride gas to be more easily released in the processing process, the thermal stability is greatly reduced, the acting force among the CPVC resin molecular chains is greatly enhanced, and the molecular chains are not easy to denaturalize and absorb energy when the material is impacted from the outside, so that the brittleness is higher, and the impact resistance is poorer.
In addition, as a cable material, improving the thermal conductivity of cpvc materials helps to improve heat dissipation performance, thereby improving safety better, but many fillers with excellent thermal conductivity also belong to electric conductors, such as carbon black, carbon fibers, carbon nanotubes, and the like, while insulating and heat-conducting fillers such as silicon nitride also have the problem of high cost, and when the heat-conducting fillers need to have good thermal conductivity, a large filling amount is needed, which has a serious influence on the mechanical properties of the material.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a high-strength heat-conducting and insulating cpvc material and a preparation method thereof.
The purpose of the invention is realized by the following technical scheme:
a high-strength insulating cpvc material comprises the following raw materials in parts by weight:
the preparation method of the coated modified carbon black comprises the following steps:
(1) adding 10-20 parts by weight of polyvinyl chloride and 5-10 parts by weight of plasticizer into 100 parts by weight of organic solvent, heating to 50-60 ℃, stirring for dissolving, then adding 25-35 parts by weight of carbon black, stirring uniformly to obtain suspension, dripping the suspension into deionized water for precipitation, filtering, washing and drying to obtain single-layer coated carbon black;
(2) adding 40-50 parts by weight of single-layer coated carbon black into 100 parts by weight of deionized water, continuously adding 10-12 parts by weight of butyl acrylate, 6-8 parts by weight of methyl methacrylate, 4-5 parts by weight of acrylic acid and 0.3-0.5 part by weight of thermal initiator while stirring, heating to 55-75 ℃ after the addition is finished, carrying out heat preservation reaction for 2-3h, then adding 4-6 parts by weight of vinyltriethoxysilane and 0.1-0.3 part by weight of thermal initiator, and continuously carrying out heat preservation reaction for 1-2h to obtain the coated modified carbon black.
The toughening means of the cpvc material generally adopts means such as elastomer toughening, rigid body toughening and synergistic toughening, the elastomer toughening generally adopts the existing conventional impact modifier such as MBS, CPE, ACR and the like, while the rigid body toughening belongs to the toughening means with an incompletely clear mechanism, generally, the method considers that the equatorial plane of the rigid body forms static pressure, and the rigid body generates brittle-tough transformation when being stretched or impacted, thereby playing a role in energy consumption, or the rigid body generates a gravity concentration phenomenon, and actively induces resin around the rigid body to generate silver veins or shear bands, thereby absorbing a large amount of energy, but the method for improving the dispersibility of the inorganic rigid body is one of means for obviously improving the toughness no matter what explanation is based on.
In the invention, in order to improve the thermal conductivity, the high-filling-amount thermal-conductive rigid filler cannot be avoided, but the cost of modifying all the thermal-conductive fillers is very high, the grafting rate of surface grafting modification is low, and the coating modification can cause the partition of the thermal-conductive filler, thereby causing the loss of the thermal conductivity. According to the invention, one part of the heat-conducting filler is directly added, and the other part of the heat-conducting filler is coated and modified by using low-cost carbon black, so that the material cost and the modification operation cost of the heat-conducting filler can be reduced, and the heat-conducting filler can be coated and isolated by carbon black to avoid forming a conductive path in a resin matrix, thereby ensuring the requirement on the insulating property.
The method for coating and modifying the carbon black is not only used for improving the surface performance of the carbon black, but also used for dissolving polyvinyl chloride and regenerating through reversed-phase precipitation to coat the carbon black with the polyvinyl chloride, and has the advantages of high coating rate and simplicity in operation. The two modification methods have the advantages that the two modification methods have progressive associativity and are not superior when being seen independently, the coating modification of the polyvinyl chloride is high in coating rate, but the polyvinyl chloride and the chlorinated polyvinyl chloride belong to compatible polymers, and the polyvinyl chloride and the chlorinated polyvinyl chloride are welded together again in the melting process, so that the carbon black of the inner core is redispersed under the shearing action and is easy to reunite, and the mechanical property is reduced; the disadvantages of grafting carbon black by initiating polymerization with acrylate are that the reaction sites of carbon black are few, the degree of grafting reaction is low, and the effect of modifying carbon black is not good. The invention firstly adopts a dissolution regeneration method to physically coat the carbon black, thereby providing more reactive sites to react with the polyacrylate, and improving the coating modification effect of the polyacrylate. In addition, by the blocking effect of the polyacrylate elastomer layer, the polyvinyl chloride inner shell layer and the matrix chlorinated polyvinyl chloride can be prevented from being welded to a certain extent even in the melt extrusion process, namely the layered structure of the chlorinated polyvinyl chloride-polyacrylate-polyvinyl chloride-carbon black is well maintained, and the phase separation property of each phase is favorable for initiating the stress concentration phenomenon, so that the toughness change energy is better consumed, and the toughness of the material is well improved. Accordingly, however, the cpvc material of the present invention is not suitable for molding after being made into master batches, and injection molding is required after screw extrusion and mixing, because excessive shearing of the master batches is easily caused when the cpvc material enters the screw extruder for molding for the second time, and the phase structure of the present invention is damaged.
Wherein the heat conducting filler is one or more of aluminum oxide, silicon nitride and silicon carbide. Preferably, the thermally conductive filler is alumina. The particle size of the carbon black is 100-300 mu m, and the particle size of the alumina is 200-300 mu m.
Wherein the impact modifier is ACR.
Wherein the heat stabilizer is a calcium-zinc composite stabilizer.
Wherein the flame retardant is one or more of ammonium polyphosphate, zinc borate, magnesium hydroxide and aluminum hydroxide.
Wherein the internal lubricant is stearic acid, and the external lubricant is polyethylene wax.
Wherein the chlorine content of the chlorinated polyvinyl chloride is 65-71%.
Wherein the organic solvent is N, N-dimethylacetamide.
Wherein the plasticizer is dioctyl phthalate.
The preparation method of the high-strength insulating cpvc material comprises the following steps:
weighing the raw materials according to the mixture ratio, putting the chlorinated polyvinyl chloride, the heat-conducting filler and the impact modifier into a high-speed mixer, mixing and heating to 60-80 ℃, then putting the coated modified carbon black, the heat stabilizer, the flame retardant, the internal lubricant and the external lubricant into the high-speed mixer, mixing and heating to 80-100 ℃, and then putting the mixture into a double-screw extruder for extrusion molding to obtain the high-strength insulating cpvc material.
The invention has the beneficial effects that: the invention not only realizes the cooperative toughening of the inorganic rigid body and the organic elastomer to the cpvc, but also carries out optimized structure adjustment on the dispersion condition of the filler by the innovative combination of the selection and modification methods of the filler, thereby improving the thermal conductivity, reducing the cost and ensuring the insulativity, and having great application prospect as a cable material.
Detailed Description
The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.
Example 1
A high-strength insulating cpvc material comprises the following raw materials in parts by weight:
the preparation method of the coated modified carbon black comprises the following steps:
(1) adding 15 parts by weight of polyvinyl chloride and 7.5 parts by weight of plasticizer into 100 parts by weight of organic solvent, heating to 55 ℃, stirring for dissolving, then adding 30 parts by weight of carbon black, uniformly stirring to obtain a suspension, dripping the suspension into deionized water for precipitation, filtering, washing and drying to obtain single-layer coated carbon black;
(2) adding 45 parts by weight of single-layer coated carbon black into 100 parts by weight of deionized water, continuously adding 11 parts by weight of butyl acrylate, 7 parts by weight of methyl methacrylate, 4.5 parts by weight of acrylic acid and 0.4 part by weight of thermal initiator while stirring, heating to 65 ℃ after the addition is finished, carrying out heat preservation reaction for 2.5 hours, then adding 5 parts by weight of vinyltriethoxysilane and 0.2 part by weight of thermal initiator, and continuously carrying out heat preservation reaction for 1.5 hours to obtain the coated modified carbon black.
Wherein the heat conductive filler is alumina. The particle size of the carbon black is 200 μm, and the particle size of the alumina is 250 μm.
Wherein the impact modifier is ACR.
Wherein the heat stabilizer is a calcium-zinc composite stabilizer.
Wherein the flame retardant is ammonium polyphosphate.
Wherein the internal lubricant is stearic acid, and the external lubricant is polyethylene wax.
Wherein the chlorinated polyvinyl chloride has a chlorine content of 67.5%.
Wherein the organic solvent is N, N-dimethylacetamide.
Wherein the plasticizer is dioctyl phthalate.
The preparation method of the high-strength insulating cpvc material comprises the following steps:
weighing the raw materials according to the mixture ratio, putting the chlorinated polyvinyl chloride, the heat-conducting filler and the impact modifier into a high-speed mixer, mixing and heating to 70 ℃, then putting the coated modified carbon black, the heat stabilizer, the flame retardant, the internal lubricant and the external lubricant into the high-speed mixer, mixing and heating to 90 ℃, and then putting the mixture into a double-screw extruder for extrusion molding, thereby obtaining the high-strength insulating cpvc material.
The temperature of each zone of the double-screw extruder is respectively as follows: the first zone is 180 ℃, the second zone is 185 ℃, the third zone is 190 ℃, the fourth zone is 195 ℃, the fifth zone is 190 ℃, the rotating speed is 50r/min, and the diameter of the screw is 65 mm.
Example 2
A high-strength insulating cpvc material comprises the following raw materials in parts by weight:
the preparation method of the coated modified carbon black comprises the following steps:
(1) adding 10 parts by weight of polyvinyl chloride and 5 parts by weight of plasticizer into 100 parts by weight of organic solvent, heating to 50 ℃, stirring for dissolving, then adding 25 parts by weight of carbon black, uniformly stirring to obtain a suspension, dripping the suspension into deionized water for precipitation, filtering, washing and drying to obtain single-layer coated carbon black;
(2) adding 40 parts by weight of single-layer coated carbon black into 100 parts by weight of deionized water, continuously adding 10 parts by weight of butyl acrylate, 6 parts by weight of methyl methacrylate, 4 parts by weight of acrylic acid and 0.3 part by weight of thermal initiator while stirring, heating to 55 ℃ after the addition is finished, carrying out heat preservation reaction for 2 hours, then adding 4 parts by weight of vinyltriethoxysilane and 0.1 part by weight of thermal initiator, and continuously carrying out heat preservation reaction for 1 hour to obtain the coated modified carbon black.
Wherein the heat conductive filler is alumina. The particle size of the carbon black is 100 μm, and the particle size of the alumina is 200 μm.
Wherein the impact modifier is ACR.
Wherein the heat stabilizer is a calcium-zinc composite stabilizer.
Wherein the flame retardant is a mixture of ammonium polyphosphate and zinc borate.
Wherein the internal lubricant is stearic acid, and the external lubricant is polyethylene wax.
Wherein the chlorinated polyvinyl chloride has a chlorine content of 65%.
Wherein the organic solvent is N, N-dimethylacetamide.
Wherein the plasticizer is dioctyl phthalate.
The preparation method of the high-strength insulating cpvc material comprises the following steps:
weighing the raw materials according to the mixture ratio, putting the chlorinated polyvinyl chloride, the heat-conducting filler and the impact modifier into a high-speed mixer, mixing and heating to 60 ℃, then putting the coated modified carbon black, the heat stabilizer, the flame retardant, the internal lubricant and the external lubricant into the high-speed mixer, mixing and heating to 80 ℃, and then putting the mixture into a double-screw extruder for extrusion molding to obtain the high-strength insulating cpvc material.
The temperature of each zone of the double-screw extruder is respectively as follows: the first zone is 180 ℃, the second zone is 185 ℃, the third zone is 190 ℃, the fourth zone is 195 ℃, the fifth zone is 190 ℃, the rotating speed is 50r/min, and the diameter of the screw is 65 mm.
Example 3
A high-strength insulating cpvc material comprises the following raw materials in parts by weight:
the preparation method of the coated modified carbon black comprises the following steps:
(1) adding 20 parts by weight of polyvinyl chloride and 10 parts by weight of plasticizer into 100 parts by weight of organic solvent, heating to 60 ℃, stirring for dissolving, then adding 35 parts by weight of carbon black, uniformly stirring to obtain a suspension, dripping the suspension into deionized water for precipitation, filtering, washing and drying to obtain single-layer coated carbon black;
(2) adding 50 parts by weight of single-layer coated carbon black into 100 parts by weight of deionized water, continuously adding 12 parts by weight of butyl acrylate, 8 parts by weight of methyl methacrylate, 5 parts by weight of acrylic acid and 0.5 part by weight of thermal initiator while stirring, heating to 75 ℃ after the addition is finished, carrying out heat preservation reaction for 3 hours, then adding 6 parts by weight of vinyltriethoxysilane and 0.3 part by weight of thermal initiator, and continuously carrying out heat preservation reaction for 2 hours to obtain the coated modified carbon black.
Wherein the heat conductive filler is alumina. The particle size of the carbon black is 300 mu m, and the particle size of the alumina is 300 mu m.
Wherein the impact modifier is ACR.
Wherein the heat stabilizer is a calcium-zinc composite stabilizer.
Wherein the flame retardant is a mixture of magnesium hydroxide and aluminum hydroxide.
Wherein the internal lubricant is stearic acid, and the external lubricant is polyethylene wax.
Wherein the chlorinated polyvinyl chloride has a chlorine content of 71%.
Wherein the organic solvent is N, N-dimethylacetamide.
Wherein the plasticizer is dioctyl phthalate.
The preparation method of the high-strength insulating cpvc material comprises the following steps:
weighing the raw materials according to the mixture ratio, putting the chlorinated polyvinyl chloride, the heat-conducting filler and the impact modifier into a high-speed mixer, mixing and heating to 80 ℃, then putting the coated modified carbon black, the heat stabilizer, the flame retardant, the internal lubricant and the external lubricant into the high-speed mixer, mixing and heating to 100 ℃, and then putting the mixture into a double-screw extruder for extrusion molding to obtain the high-strength insulating cpvc material.
The temperature of each zone of the double-screw extruder is respectively as follows: the first zone is 180 ℃, the second zone is 185 ℃, the third zone is 190 ℃, the fourth zone is 195 ℃, the fifth zone is 190 ℃, the rotating speed is 50r/min, and the diameter of the screw is 65 mm.
Example 4
A high-strength insulating cpvc material comprises the following raw materials in parts by weight:
the preparation method of the coated modified carbon black comprises the following steps:
(1) adding 17 parts by weight of polyvinyl chloride and 8 parts by weight of plasticizer into 100 parts by weight of organic solvent, heating to 57 ℃, stirring for dissolving, then adding 31 parts by weight of carbon black, uniformly stirring to obtain a suspension, dripping the suspension into deionized water for precipitation, filtering, washing and drying to obtain single-layer coated carbon black;
(2) adding 42 parts by weight of single-layer coated carbon black into 100 parts by weight of deionized water, continuously adding 11 parts by weight of butyl acrylate, 6 parts by weight of methyl methacrylate, 5 parts by weight of acrylic acid and 0.3 part by weight of thermal initiator while stirring, heating to 60 ℃ after the addition is finished, carrying out heat preservation reaction for 2.5 hours, then adding 5 parts by weight of vinyltriethoxysilane and 0.1-0.3 part by weight of thermal initiator, and continuously carrying out heat preservation reaction for 2 hours to obtain the coated modified carbon black.
Wherein the heat conductive filler is silicon nitride. The particle size of the carbon black is 200 mu m, and the particle size of the silicon nitride is 300 mu m.
Wherein the impact modifier is ACR.
Wherein the heat stabilizer is a calcium-zinc composite stabilizer.
Wherein the flame retardant is a mixture of ammonium polyphosphate and magnesium hydroxide.
Wherein the internal lubricant is stearic acid, and the external lubricant is polyethylene wax.
Wherein the chlorinated polyvinyl chloride has a chlorine content of 70%.
Wherein the organic solvent is N, N-dimethylacetamide.
Wherein the plasticizer is dioctyl phthalate.
The preparation method of the high-strength insulating cpvc material comprises the following steps:
weighing the raw materials according to the mixture ratio, putting the chlorinated polyvinyl chloride, the heat-conducting filler and the impact modifier into a high-speed mixer, mixing and heating to 650 ℃, then putting the coated modified carbon black, the heat stabilizer, the flame retardant, the internal lubricant and the external lubricant into the high-speed mixer, mixing and heating to 85 ℃, and then putting the mixture into a double-screw extruder for extrusion molding to obtain the high-strength insulating cpvc material.
The temperature of each zone of the double-screw extruder is respectively as follows: the first zone is 180 ℃, the second zone is 185 ℃, the third zone is 190 ℃, the fourth zone is 195 ℃, the fifth zone is 190 ℃, the rotating speed is 50r/min, and the diameter of the screw is 65 mm.
Example 5
A high-strength insulating cpvc material comprises the following raw materials in parts by weight:
the preparation method of the coated modified carbon black comprises the following steps:
(1) adding 13 parts by weight of polyvinyl chloride and 6 parts by weight of plasticizer into 100 parts by weight of organic solvent, heating to 52 ℃, stirring for dissolving, then adding 28 parts by weight of carbon black, uniformly stirring to obtain a suspension, dripping the suspension into deionized water for precipitation, filtering, washing and drying to obtain single-layer coated carbon black;
(2) adding 44 parts by weight of single-layer coated carbon black into 100 parts by weight of deionized water, continuously adding 11 parts by weight of butyl acrylate, 7 parts by weight of methyl methacrylate, 4.5 parts by weight of acrylic acid and 0.4 part by weight of thermal initiator while stirring, heating to 65 ℃ after the addition is finished, carrying out heat preservation reaction for 2.5 hours, then adding 5 parts by weight of vinyltriethoxysilane and 0.2 part by weight of thermal initiator, and continuously carrying out heat preservation reaction for 1.5 hours to obtain the coated modified carbon black.
Wherein the heat conductive filler is silicon carbide. The particle size of the carbon black is 100 μm, and the particle size of the silicon carbide is 100 μm.
Wherein the impact modifier is ACR.
Wherein the heat stabilizer is a calcium-zinc composite stabilizer.
Wherein the flame retardant is a mixture of ammonium polyphosphate and aluminum hydroxide.
Wherein the internal lubricant is stearic acid, and the external lubricant is polyethylene wax.
Wherein the chlorinated polyvinyl chloride has a chlorine content of 66%.
Wherein the organic solvent is N, N-dimethylacetamide.
Wherein the plasticizer is dioctyl phthalate.
The preparation method of the high-strength insulating cpvc material comprises the following steps:
weighing the raw materials according to the mixture ratio, putting the chlorinated polyvinyl chloride, the heat-conducting filler and the impact modifier into a high-speed mixer, mixing and heating to 75 ℃, then putting the coated modified carbon black, the heat stabilizer, the flame retardant, the internal lubricant and the external lubricant into the high-speed mixer, mixing and heating to 96 ℃, and then putting the mixture into a double-screw extruder for extrusion molding to obtain the high-strength insulating cpvc material.
The temperature of each zone of the double-screw extruder is respectively as follows: the first zone is 180 ℃, the second zone is 185 ℃, the third zone is 190 ℃, the fourth zone is 195 ℃, the fifth zone is 190 ℃, the rotating speed is 50r/min, and the diameter of the screw is 65 mm.
Comparative example 1
A high-strength insulating cpvc material comprises the following raw materials in parts by weight:
the preparation method of the coated modified carbon black comprises the following steps:
(1) adding 15 parts by weight of polyvinyl chloride and 7.5 parts by weight of plasticizer into 100 parts by weight of organic solvent, heating to 55 ℃, stirring for dissolving, then adding 30 parts by weight of carbon black, uniformly stirring to obtain suspension, dripping the suspension into deionized water for precipitation, filtering, washing and drying to obtain single-layer coated carbon black
Wherein the heat conductive filler is alumina. The particle size of the carbon black is 200 μm, and the particle size of the alumina is 250 μm.
Wherein the impact modifier is ACR.
Wherein the heat stabilizer is a calcium-zinc composite stabilizer.
Wherein the flame retardant is ammonium polyphosphate.
Wherein the internal lubricant is stearic acid, and the external lubricant is polyethylene wax.
Wherein the chlorinated polyvinyl chloride has a chlorine content of 67.5%.
Wherein the organic solvent is N, N-dimethylacetamide.
Wherein the plasticizer is dioctyl phthalate.
The preparation method of the high-strength insulating cpvc material comprises the following steps:
weighing the raw materials according to the mixture ratio, putting the chlorinated polyvinyl chloride, the heat-conducting filler and the impact modifier into a high-speed mixer, mixing and heating to 70 ℃, then putting the coated modified carbon black, the heat stabilizer, the flame retardant, the internal lubricant and the external lubricant into the high-speed mixer, mixing and heating to 90 ℃, and then putting the mixture into a double-screw extruder for extrusion molding, thereby obtaining the high-strength insulating cpvc material.
The temperature of each zone of the double-screw extruder is respectively as follows: the first zone is 180 ℃, the second zone is 185 ℃, the third zone is 190 ℃, the fourth zone is 195 ℃, the fifth zone is 190 ℃, the rotating speed is 50r/min, and the diameter of the screw is 65 mm.
Comparative example 2
A high-strength insulating cpvc material comprises the following raw materials in parts by weight:
the preparation method of the coated modified carbon black comprises the following steps:
adding 40 parts by weight of silane coupling agent modified carbon black into 100 parts by weight of deionized water, continuously adding 11 parts by weight of butyl acrylate, 7 parts by weight of methyl methacrylate, 4.5 parts by weight of acrylic acid and 0.4 part by weight of thermal initiator while stirring, heating to 65 ℃ after the addition is finished, carrying out heat preservation reaction for 2.5 hours, then adding 5 parts by weight of vinyltriethoxysilane and 0.2 part by weight of thermal initiator, and continuously carrying out heat preservation reaction for 1.5 hours to obtain the modified carbon black.
Wherein the heat conductive filler is alumina. The particle size of the carbon black is 200 μm, and the particle size of the alumina is 250 μm.
Wherein the impact modifier is ACR.
Wherein the heat stabilizer is a calcium-zinc composite stabilizer.
Wherein the flame retardant is ammonium polyphosphate.
Wherein the internal lubricant is stearic acid, and the external lubricant is polyethylene wax.
Wherein the chlorinated polyvinyl chloride has a chlorine content of 67.5%.
Wherein the plasticizer is dioctyl phthalate.
The preparation method of the high-strength insulating cpvc material comprises the following steps:
weighing the raw materials according to the mixture ratio, putting the chlorinated polyvinyl chloride, the heat-conducting filler and the impact modifier into a high-speed mixer, mixing and heating to 70 ℃, then putting the coated modified carbon black, the heat stabilizer, the flame retardant, the internal lubricant and the external lubricant into the high-speed mixer, mixing and heating to 90 ℃, and then putting the mixture into a double-screw extruder for extrusion molding, thereby obtaining the high-strength insulating cpvc material.
The temperature of each zone of the double-screw extruder is respectively as follows: the first zone is 180 ℃, the second zone is 185 ℃, the third zone is 190 ℃, the fourth zone is 195 ℃, the fifth zone is 190 ℃, the rotating speed is 50r/min, and the diameter of the screw is 65 mm.
Comparative example 3
A high-strength insulating cpvc material comprises the following raw materials in parts by weight:
wherein the heat conductive filler is alumina. The particle size of the carbon black is 200 μm, and the particle size of the alumina is 250 μm.
Wherein the impact modifier is ACR.
Wherein the heat stabilizer is a calcium-zinc composite stabilizer.
Wherein the flame retardant is ammonium polyphosphate.
Wherein the internal lubricant is stearic acid, and the external lubricant is polyethylene wax.
Wherein the chlorinated polyvinyl chloride has a chlorine content of 67.5%.
Wherein the plasticizer is dioctyl phthalate.
The preparation method of the high-strength insulating cpvc material comprises the following steps:
weighing the raw materials according to the mixture ratio, putting the chlorinated polyvinyl chloride, the heat-conducting filler and the impact modifier into a high-speed mixer, mixing and heating to 70 ℃, then putting the coated modified carbon black, the heat stabilizer, the flame retardant, the internal lubricant and the external lubricant into the high-speed mixer, mixing and heating to 90 ℃, and then putting the mixture into a double-screw extruder for extrusion molding, thereby obtaining the high-strength insulating cpvc material.
The temperature of each zone of the double-screw extruder is respectively as follows: the first zone is 180 ℃, the second zone is 185 ℃, the third zone is 190 ℃, the fourth zone is 195 ℃, the fifth zone is 190 ℃, the rotating speed is 50r/min, and the diameter of the screw is 65 mm.
The samples were subjected to tests for tensile strength, flexural strength, impact strength, dielectric strength and thermal conductivity, the test standards and results being as follows:
tensile strength: GB/T1040
Bending strength: GB/T9341
Notched impact strength: GB/T1043
Dielectric strength: GB/T8815
Coefficient of thermal conductivity: ISO22007-2
As can be seen from the data in the above table, the carbon black in comparative example 1 is only coated and modified by polyvinyl chloride, and although the dispersibility of the carbon black is improved to some extent, the improvement degree is not obvious, so that the mechanical property is reduced, and accordingly, the reduction of the dispersibility indicates that the filler passage is more likely to occur in the matrix, so that the dielectric property and the thermal conductivity tend to be reduced. In comparative example 2, the carbon black is modified by the silane coupling agent and the polyacrylate is coated, and compared with comparative example 1, the dispersibility of the carbon black is improved better, so that the mechanical property tends to increase, but the dielectric strength and the thermal conductivity coefficient have no obvious difference, which indicates that the barrier property of the carbon black is still to be improved. Comparative example 3 carbon black and a heat conductive filler were not modified, and the dispersibility of inorganic particles was the worst, so the mechanical properties were also the worst, but the corresponding thermal conductivity was further improved, but the loss of mechanical properties further restricted the use of cpvc materials.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (10)
1. A high strength insulating cpvc material characterized by: the feed comprises the following raw materials in parts by weight:
the preparation method of the coated modified carbon black comprises the following steps:
(1) adding 10-20 parts by weight of polyvinyl chloride and 5-10 parts by weight of plasticizer into 100 parts by weight of organic solvent, heating to 50-60 ℃, stirring for dissolving, then adding 25-35 parts by weight of carbon black, stirring uniformly to obtain suspension, dripping the suspension into deionized water for precipitation, filtering, washing and drying to obtain single-layer coated carbon black;
(2) adding 40-50 parts by weight of single-layer coated carbon black into 100 parts by weight of deionized water, continuously adding 10-12 parts by weight of butyl acrylate, 6-8 parts by weight of methyl methacrylate, 4-5 parts by weight of acrylic acid and 0.3-0.5 part by weight of thermal initiator while stirring, heating to 55-75 ℃ after the addition is finished, carrying out heat preservation reaction for 2-3h, then adding 4-6 parts by weight of vinyltriethoxysilane and 0.1-0.3 part by weight of thermal initiator, and continuously carrying out heat preservation reaction for 1-2h to obtain the coated modified carbon black.
2. A high strength insulating cpvc material as claimed in claim 1, wherein: the heat conducting filler is one or more of aluminum oxide, silicon nitride and silicon carbide.
3. A high strength insulating cpvc material as claimed in claim 1, wherein: the impact modifier is ACR.
4. A high strength insulating cpvc material as claimed in claim 1, wherein: the heat stabilizer is a calcium-zinc composite stabilizer.
5. A high strength insulating cpvc material as claimed in claim 1, wherein: the flame retardant is one or more of ammonium polyphosphate, zinc borate, magnesium hydroxide and aluminum hydroxide.
6. A high strength insulating cpvc material as claimed in claim 1, wherein: the internal lubricant is stearic acid, and the external lubricant is polyethylene wax.
7. A high strength insulating cpvc material as claimed in claim 1, wherein: the chlorine content of the chlorinated polyvinyl chloride is 65-71%.
8. A high strength insulating cpvc material as claimed in claim 1, wherein: the organic solvent is N, N-dimethylacetamide.
9. A high strength insulating cpvc material as claimed in claim 1, wherein: the plasticizer is dioctyl phthalate.
10. A method of producing a high strength insulating cpvc material as claimed in any one of claims 1 to 9, wherein: the method comprises the following steps:
weighing the raw materials according to the mixture ratio, putting the chlorinated polyvinyl chloride, the heat-conducting filler and the impact modifier into a high-speed mixer, mixing and heating to 60-80 ℃, then putting the coated modified carbon black, the heat stabilizer, the flame retardant, the internal lubricant and the external lubricant into the high-speed mixer, mixing and heating to 80-100 ℃, and then putting the mixture into a double-screw extruder for extrusion molding to obtain the high-strength insulating cpvc material.
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