Flame retardant for PVC processing and preparation method thereof, and flame-retardant electric power tube containing flame retardant

A flame retardant and flame retardant technology, applied in the field of PVC flame retardant, can solve the problems of unable to meet the requirements of inorganic flame retardant coating, limited β-cyclodextrin coating rate, difficulty in inorganic flame retardants, etc., to achieve increased Active loading sites, improved flame retardant effect, improved chelation effect

Active Publication Date: 2021-09-28
四川兴辉腾集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, in order to improve the flame retardant effect, the method of coating a variety of inorganic flame retardants is used to achieve its flame retardant purpose, but the coating rate of β-cyclodextrin is limited, which cannot meet the requirements of excessive inorganic flame retardant coating. Flame retardant coating requirements, and if the amount of inorganic flame retardant added is too large, there is a problem that the inorganic flame retardant is difficult to mix in the PVC system

Method used

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  • Flame retardant for PVC processing and preparation method thereof, and flame-retardant electric power tube containing flame retardant
  • Flame retardant for PVC processing and preparation method thereof, and flame-retardant electric power tube containing flame retardant

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preparation example Construction

[0037] Second, the invention provides a method for preparing a flame retardant for PVC processing, comprising the steps of:

[0038] (1) Weighing nano inorganic flame retardants, organically modified cyclodextrins and salts containing flame retardant elements in proportion;

[0039](2) Dissolve the salt containing flame retardant elements in water to form a salt solution, and then immerse the organic modified cyclodextrin in the salt solution, so that the flame retardant elements are loaded on the organic modified cyclodextrin, and then add nano Inorganic flame retardants are blended to form a coating liquid, stirred evenly at 25-30°C and 5000-8000r / min, and then spray-dried to obtain a flame-retardant coating.

[0040] In the present invention, the mass ratio of salts of flame retardant elements, water, organic modified cyclodextrin and nano inorganic flame retardant is 1-10:100-200:40-60:15-25.

[0041] In the present invention, the method for coating the outer capsule shel...

Embodiment 1

[0047] A kind of flame retardant for PVC processing, its preparation method, comprises the steps:

[0048] (1) Preparation of organically modified cyclodextrin

[0049] DMF was placed in an airtight container, and potassium persulfate was added after nitrogen exhaustion to dissolve; acrylonitrile and β-cyclodextrin were dissolved in an organic solvent, blended and heated (65°C, 5h) to obtain a reaction product, and the reaction After centrifugation, the product was repeatedly ultrasonically dissolved in DMF until it was centrifuged until the supernatant had no white precipitate. The final product was washed with absolute ethanol and then dried to obtain an intermediate product; the intermediate product was saponified by adding 1mol / L NaOH solution React (75°C, 1.5h), centrifuge, and dry (50°C, 4h) to obtain polyacrylonitrile saponified modified β-cyclodextrin. The volume ratio of DMF to acrylonitrile was 6:1, the amount of potassium persulfate added was 0.2 mol / L, and the amo...

Embodiment 2

[0055] The difference between this embodiment and embodiment 1 is that the addition amount of magnesium chloride and zinc chloride in (2) is 3 parts.

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Abstract

The invention relates to the technical field of PVC flame retardance, and discloses a flame retardant for PVC processing. The flame retardant comprises a flame-retardant coating, wherein the flame-retardant coating comprises a capsule core and an inner capsule shell; the capsule core is a nano-inorganic flame retardant; the inner capsule shell is organic modified cyclodextrin loaded with a flame-retardant element, and the organic modified cyclodextrin is grafted with a chelating functional group; and the flame-retardant coating comprises, in parts by weight, 15 to 25 parts of the capsule core and 40 to 60 parts of the inner capsule shell. The invention also discloses a preparation method and a flame-retardant power tube. According to the invention, beta-cyclodextrin is subjected to organic modification treatment, so the purpose of increasing active load sites of the beta-cyclodextrin is achieved; an organic macromolecule with the chelating functional group is selected, so the chelating degree of the flame-retardant element and a macromolecular structure can be improved; and through the synergistic effect of the flame-retardant element and the nano-inorganic flame retardant, flame-retardant effect is further improved, and the mechanical properties of the PVC system are maintained.

Description

technical field [0001] The invention relates to the technical field of PVC flame retardant, in particular to a flame retardant for PVC processing, a preparation method thereof, and a flame retardant power tube containing the flame retardant. Background technique [0002] PVC is a polymer material commonly used in the electric power field. PVC is characterized by high withstand voltage and insulation resistance, and has properties such as flame retardancy, oil resistance, weather resistance, and chemical resistance, so it is widely used. Since pure PVC is a rigid chain segment, it begins to decompose above 90°C, and plasticizers need to be added during processing. However, plasticizers are flammable, and when adding soft PVC with plasticizers, flame retardants must be added. It has flame retardant effect. At present, it is mostly realized by adding halogen-containing flame retardants. However, halogen-containing flame retardants will produce a large amount of smoke and toxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K3/22C08K3/26C08K7/04C08K7/10C08L27/06
CPCC08K9/10C08K3/22C08K3/2279C08K3/26C08K7/04C08K7/10C08L27/06C08K2201/011C08L2201/02C08K2003/2227C08K2003/2224C08L2203/18
Inventor 李伦朱明闯
Owner 四川兴辉腾集团有限公司
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