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CN-121975250-A - Weather-resistant PVC wire and cable material and preparation method thereof

CN121975250ACN 121975250 ACN121975250 ACN 121975250ACN-121975250-A

Abstract

The invention belongs to the technical field of polymer materials, and particularly relates to a weather-resistant PVC (polyvinyl chloride) wire and cable material and a preparation method thereof. The weather-resistant PVC wire and cable material is prepared from the following components, by weight, 100 parts of PVC resin, 0.5-2 parts of a stabilizer, 3-15 parts of chlorinated EVA (ethylene vinyl acetate), 5-30 parts of organosilicon modified polyester and 5-40 parts of a filler, wherein the organosilicon modified polyester is a copolymer product of polymaleic acid glycol ester and hydroxyl silicone oil, and is obtained by grafting trialkoxysilane coupling agent through high-specificity hydrosilylation reaction. The PVC wire and cable material disclosed by the invention is subjected to synergistic modification by adopting the chlorinated EVA and the organosilicon modified polyester, so that the plasticizing effect is achieved, the integral combination effect of all the components can be obviously improved, and the comprehensive improvement of the strength, the toughness, the insulativity and the weather resistance is realized.

Inventors

  • AI XIAORONG
  • HUANG YUANCHANG

Assignees

  • 广东弘山川电子科技有限公司

Dates

Publication Date
20260505
Application Date
20260321

Claims (10)

  1. 1. The weather-resistant PVC wire and cable material is characterized by comprising the following components in parts by weight: 100 parts of PVC resin, 0.5-2 parts of stabilizer, 3-15 parts of chlorinated EVA, 5-30 parts of organosilicon modified polyester and 5-40 parts of filler; the preparation method of the organosilicon modified polyester comprises the following steps: S1, adding maleic anhydride and dihydric alcohol into a xylene solvent according to a molar ratio of 1:1.2-1.6 for dissolution, then adding a solid acid catalyst, heating and stirring for reaction, and filtering to remove the catalyst after the reaction is completed to obtain a poly (glycol maleate) solution; s2, adding hydroxyl silicone oil into the poly (glycol maleate) solution in the step S1 for dissolution, and then adding an organotin catalyst for heating and stirring reaction to obtain an organosilicon modified polyester solution; S3, adding activated carbon into the organosilicon modified polyester solution in the step S2 for adsorption, filtering to remove an organotin catalyst, then adding trialkoxy hydrogen silane and chloroplatinic acid catalyst solution for heating and stirring reaction, and evaporating to remove a solvent after the reaction is completed to obtain the organosilicon modified polyester.
  2. 2. The weather-resistant PVC wire and cable material as claimed in claim 1, wherein the dihydric alcohol in the step S1 is at least one of butanediol, pentanediol, hexanediol, heptanediol and octanediol.
  3. 3. A weather-resistant PVC wire and cable material as set forth in claim 1, wherein said solid acid catalyst in step S1 is a perfluorosulfonic acid resin catalyst.
  4. 4. A weather-resistant PVC wire and cable material as claimed in claim 3, wherein the temperature of the heating and stirring reaction in the step S1 is 60-120 ℃ and the reaction time is 1-3h.
  5. 5. The weather-resistant PVC wire and cable material as claimed in claim 1, wherein the hydroxyl silicone oil in the step S2 has a number average molecular weight of 1000-5000 and the addition amount of the hydroxyl silicone oil is 30-70% of the mass of the poly (glycol maleate).
  6. 6. The weather-resistant PVC wire and cable material as claimed in claim 1, wherein the temperature of the heating and stirring reaction in the step S2 is 160-200 ℃ and the reaction time is 3-6h.
  7. 7. A weather-resistant PVC wire and cable material as set forth in claim 1, wherein the trialkoxy hydrogen silane in the step S3 is trimethoxy hydrogen silane or triethoxy hydrogen silane, and the addition amount of the trialkoxy hydrogen silane is 5-30% of the mass of maleic anhydride.
  8. 8. The weather-resistant PVC wire and cable material as claimed in claim 1, wherein the stabilizer is a calcium-zinc composite stabilizer.
  9. 9. The weather-resistant PVC wire and cable material as recited in claim 1, wherein the filler is at least one of nano calcium carbonate, nano silicon dioxide and nano kaolin.
  10. 10. The preparation method of the weather-resistant PVC wire and cable material as set forth in any one of claims 1 to 9, which is characterized by comprising the following preparation steps: Adding PVC resin, a stabilizer, chlorinated EVA, organosilicon modified polyester and filler into a mixing mill, mixing uniformly, and extruding and molding to obtain the weather-resistant PVC wire and cable material.

Description

Weather-resistant PVC wire and cable material and preparation method thereof Technical Field The invention belongs to the technical field of polymer materials, and particularly relates to a weather-resistant PVC (polyvinyl chloride) wire and cable material and a preparation method thereof. Background The PVC wire and cable material has the advantages of good chemical stability, wear resistance, flame retardance, electrical insulation, low cost and availability of raw materials and the like, so that the PVC wire and cable material becomes the most used material in the wire and cable industry for a long time. However, the pure PVC material has high hardness, large brittleness and difficult processing, and a plasticizer is required to be added to improve the processing performance and flexibility of the PVC material. The plasticizers commonly used at present mainly comprise o-benzene plasticizers, chlorinated paraffin and the like. On one hand, the application of the plastic is limited due to the environmental protection problem, on the other hand, the weather resistance is insufficient due to the easy mobility and the easy photo-thermal degradation characteristic of the plastic, the product is difficult to pass the double-85 test of the weather resistance of the product, on the other hand, the addition of the plasticizer weakens the intermolecular acting force of the polymer, and the strength of the plastic is reduced along with the increase of the dosage. The patent document with publication number CN 103709558A discloses a preparation method of an environment-friendly PVC wire and cable material, which comprises, by weight, 45-50% of PVC resin, 20-25% of epoxidized soybean oil, 0.5-1% of stabilizer and 20-25% of calcium carbonate. Although the epoxidized soybean oil can protect the effect of the plasticizer, the epoxidized soybean oil has the defect of easy photo-thermal degradation, so that the weather resistance is insufficient. The polyester plasticizer has the advantages of environmental protection, migration resistance, good compatibility and the like, and is widely applied to PVC, but the conventional polyester plasticizer also has the defect of easy degradation, so that the weather resistance is insufficient. And when the dosage is too low, the plasticizing efficiency is low, and when the dosage is too high, the strength of the plastic is reduced. Disclosure of Invention In view of the above drawbacks and shortcomings of the prior art, a primary object of the present invention is to provide a weather-resistant PVC wire and cable material. The invention also aims to provide a preparation method of the weather-resistant PVC wire and cable material. The invention aims at realizing the following technical scheme: The weather-resistant PVC wire and cable material comprises the following raw materials in parts by weight: 100 parts of PVC resin, 0.5-2 parts of stabilizer, 3-15 parts of chlorinated EVA, 5-30 parts of organosilicon modified polyester and 5-40 parts of filler; the preparation method of the organosilicon modified polyester comprises the following steps: S1, adding maleic anhydride and dihydric alcohol into a xylene solvent according to a molar ratio of 1:1.2-1.6 for dissolution, then adding a solid acid catalyst, heating and stirring for reaction, and filtering to remove the catalyst after the reaction is completed to obtain a poly (glycol maleate) solution; s2, adding hydroxyl silicone oil into the poly (glycol maleate) solution in the step S1 for dissolution, and then adding an organotin catalyst for heating and stirring reaction to obtain an organosilicon modified polyester solution; S3, adding activated carbon into the organosilicon modified polyester solution in the step S2 for adsorption, filtering to remove an organotin catalyst, then adding trialkoxy hydrogen silane and chloroplatinic acid catalyst solution for heating and stirring reaction, and evaporating to remove a solvent after the reaction is completed to obtain the organosilicon modified polyester. The dihydric alcohol in the step S1 is at least one of butanediol, pentanediol, hexanediol, heptanediol and octanediol. In the step S1, the molar ratio of the maleic anhydride to the dihydric alcohol is controlled to be 1:1.2-1.6, so that the esterified product can be controlled to be a hydroxyl end-capped esterified product with low molecular weight (the number average molecular weight is about 1000-6000), and the subsequent reactivity with hydroxyl silicone oil is ensured. The solid acid catalyst in the step S1 adopts a perfluorinated sulfonic acid resin catalyst. The temperature of the heating and stirring reaction in the step S1 is 60-120 ℃ and the reaction time is 1-3h. The number average molecular weight of the hydroxyl silicone oil in the step S2 is 1000-5000, and the adding amount of the hydroxyl silicone oil is 30-70% of the mass of the poly (glycol maleate). The hydroxyl silicone oil is used for carrying out dehydration conde