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CN-121975249-A - Environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material and preparation method thereof

CN121975249ACN 121975249 ACN121975249 ACN 121975249ACN-121975249-A

Abstract

The invention relates to an environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material and a preparation method thereof, wherein the environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material comprises the following raw material components, by weight, 100 parts of polyvinyl chloride resin, 30-50 parts of a composite plasticizer, 4-10 parts of an environment-friendly composite stabilizer, 8-25 parts of a composite flame retardant, 5-30 parts of a filler, 0.1-1 part of an antioxidant, 0.3-1.5 parts of a lubricant, 0.1-0.8 part of an ultraviolet-resistant absorbent and 0.1-8 parts of a processing modifier. The PVC resin with high polymerization degree and the heat-resistant primary plasticizer are compounded, and the efficient environment-friendly calcium-zinc stabilizer is matched, so that the material is ensured not to decompose and embrittle under the condition of 105 ℃ for long-term use, the tensile strength retention rate after heat aging is more than or equal to 85% and the elongation at break retention rate is more than or equal to 70%, and the oxygen index of the material can reach more than 28% while the smoke generation is reduced through the synergistic flame retardant effect, so that the flame retardant requirement of VW-1 is met.

Inventors

  • HU CHUANMIN
  • LU WEI
  • Zhuang Lina
  • ZHANG KUN

Assignees

  • 江苏德威新材料股份有限公司

Dates

Publication Date
20260505
Application Date
20260317

Claims (10)

  1. 1. The environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material is characterized by comprising the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin; 30-50 parts of a composite plasticizer; 4-10 parts of environment-friendly composite stabilizer; 8-25 parts of a composite flame retardant; 5-30 parts of filler; 0.1-1 part of antioxidant; 0.3-1.5 parts of lubricant; 0.1-0.8 part of ultraviolet resistant absorbent; 0.1-8 parts of processing modifier.
  2. 2. The environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material according to claim 1, wherein the composite plasticizer is formed by compounding a heat-resistant primary plasticizer and an auxiliary plasticizer according to a mass ratio of 25-35:10; The heat-resistant primary plasticizer is one or more selected from trioctyl trimellitate and diisodecyl phthalate; The auxiliary plasticizer is one or more selected from dioctyl adipate and epoxidized soybean oil.
  3. 3. The environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material according to claim 2 is characterized in that the composite plasticizer consists of trioctyl trimellitate, dioctyl adipate and epoxidized soybean oil according to a mass ratio of 25-35:5:5.
  4. 4. The environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material according to claim 1, wherein the composite flame retardant is an inorganic flame retardant and is one or more selected from magnesium hydroxide, aluminum hydroxide, zinc borate, nano montmorillonite and nano silica.
  5. 5. The environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material according to claim 1, wherein the environment-friendly composite stabilizer is an environment-friendly calcium-zinc composite stabilizer.
  6. 6. The environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material as claimed in claim 1, wherein the polyvinyl chloride resin is a suspension-method loose type PVC resin with an average polymerization degree of 1300.
  7. 7. The environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material according to claim 1, wherein the antioxidant is a hindered phenol antioxidant, the lubricant is a mixture of polyethylene wax and stearic acid according to a mass ratio of 2-5:1, the filler is active heavy calcium carbonate or active light calcium carbonate, and the particle size is 800-2500 meshes.
  8. 8. The environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material according to claim 1, wherein the ultraviolet-resistant absorber is a mixture of one or more selected from the group consisting of UV-531, UV-326 and UV-P, and the processing modifier is an acrylic copolymer.
  9. 9. The method for preparing the environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material according to any one of claims 1 to 8, which is characterized by comprising the following steps: (1) Adding the formula amount of the polyvinyl chloride resin into a high-speed mixer, stirring at 400-600rpm, adding the formula amount of the composite plasticizer, stirring for 2-5 minutes, adding the formula amount of the environment-friendly composite stabilizer, the composite flame retardant, the filler, the antioxidant, the lubricant, the ultraviolet-resistant absorbent and the processing modifier, and stirring at 900-1200rpm to obtain a mixture; (2) Feeding by hot mixing, namely when the temperature of the mixture reaches 105-120 ℃, putting the mixture into a cold mixer; (3) Cold mixing, namely stirring and cooling to below 40 ℃ in a cold mixer, and discharging to obtain a dry mixed material; (4) Extruding and granulating, namely feeding the dry mixed material into a double-screw extruder for plasticizing and granulating, wherein the extruding temperature is 130-145 ℃ in a first region, 145-155 ℃ in a second region and 155-170 ℃ in a third region, the temperature of a machine head is 155-165 ℃, and the rotating speed of a screw is 200-400rpm; (5) Cooling and packaging, namely conveying the manufactured particles through air cooling, sieving and packaging to obtain a finished product.
  10. 10. The method for preparing the environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material according to claim 9, wherein in the step (4), a granulating process of connecting a double-screw extruder with a single-screw extruder in series or a die-face hot-cutting granulating process is adopted.

Description

Environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material and preparation method thereof Technical Field The invention belongs to the technical field of cable sheath materials, relates to a polyvinyl chloride sheath material, and in particular relates to an environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material and a preparation method thereof. Background Polyvinyl chloride (PVC) cable sheathing compound is widely used for the outer sheath of electric wires and cables due to its excellent mechanical properties, corrosion resistance, insulation and processability. With the increase of power density of electrical equipment and the diversification of application environments, higher requirements are put on the temperature resistance level of the cable. The 105 ℃ PVC sheath material can adapt to higher working temperature and is widely applied to the fields of automobile wires, heat-resistant electrical appliance internal connecting wires, indoor optical cables and the like. However, the conventional PVC sheathing compound has the technical problems that (1) with the deep implementation of environmental protection regulations (such as RoHS instruction), the conventional PVC material containing heavy metal stabilizers such as lead, cadmium and the like is limited to be used, the development of the PVC sheathing compound which is environment-friendly, nontoxic and can work at 105 ℃ for a long time is an industry trend, and (2) the PVC sheathing compound in the prior art has the problems of flame retardant efficiency, flame retardant property, and the like, There is still room for improvement in terms of aging resistance and thermal deformation, particularly in terms of meeting the requirements of high oxygen index and the retention rate of tensile strength after long-term thermal aging, it is difficult to meet the severe standards of certain high-end application scenes (such as high-voltage wire harness jackets for new energy automobiles and indoor optical cable jackets), and in addition, the existing products have defects in terms of low-temperature flexibility, UV resistance, surface hardness and the like. The Chinese patent application No. 20110251308. X discloses a special 105 ℃ environment-friendly flame-retardant PVC cable sheath material for indoor flexible optical cables, which adopts trioctyl trimellitate and isodecyl phthalate as plasticizers and is matched with nano montmorillonite, nano silicon dioxide and zinc borate as flame retardants. Another example is chinese patent application number 201410241221.8, which discloses a 105 ℃ environment-friendly polyvinyl chloride sheathing compound, which uses trioctyl trimellitate and diisodecyl phthalate as main plasticizers and calcium-zinc stabilizer. However, these formulations have yet to be improved in terms of a comprehensive balance of flame retardant efficiency, heat aging properties, low temperature flexibility and UV resistance. Therefore, an environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material with excellent flame retardant property, excellent thermal stability, good low-temperature flexibility and UV resistance is developed, and the environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material has important market value and application prospect. Disclosure of Invention In view of the shortcomings of the prior art routes, the invention aims to provide an environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material. In order to achieve the purpose, the invention provides an environment-friendly 105 ℃ flame-retardant polyvinyl chloride sheath material, which comprises the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin; 30-50 parts of a composite plasticizer; 4-10 parts of environment-friendly composite stabilizer; 8-25 parts of a composite flame retardant; 5-30 parts of filler; 0.1-1 part of antioxidant; 0.3-1.5 parts of lubricant; 0.1-0.8 part of ultraviolet resistant absorbent; 0.1-8 parts of processing modifier. Optimally, the composite plasticizer is compounded by a heat-resistant primary plasticizer and a secondary plasticizer according to a mass ratio of 25-35:10; The heat-resistant primary plasticizer is one or more selected from trioctyl trimellitate and diisodecyl phthalate; The auxiliary plasticizer is one or more selected from dioctyl adipate and epoxidized soybean oil. Further, the composite plasticizer is composed of trioctyl trimellitate, dioctyl adipate and epoxidized soybean oil according to the mass ratio of 25-35:5:5. Optimally, the composite flame retardant is an inorganic flame retardant and is one or more selected from magnesium hydroxide, aluminum hydroxide, zinc borate, nano montmorillonite and nano silicon dioxide. Optimally, the environment-friendly composite stabilizer is an environment-friendly calcium-zinc composite stabilizer. Optimally, the polyvinyl chloride resin is a suspensi