Method capable of improving thermostability and flame retardance of PVC

A flame retardant and thermally stable technology, applied in the field of improving PVC thermal stability and flame retardant properties, to achieve the effects of improving thermal stability and flame retardant properties, improving mechanical strength, and increasing phenolic hydroxyl content

Active Publication Date: 2019-07-26
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are no relevant reports on the addition of nano-magnesium borate / lignin composites to PVC to enhance its performance.

Method used

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  • Method capable of improving thermostability and flame retardance of PVC

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for improving PVC heat stability and flame retardancy, the method comprises the steps,

[0034] (1) Hydrophobic and plasticizing modification: Take dry nano-magnesium borate / lignin composite material (mass ratio of magnesium borate to original lignin is 1:0.5, activated lignin mechanical solid-phase reaction activation time is 0.5h) as reinforcement Addition of reinforcing agent is 20% of the total mass of PVC and reinforcing agent, adding DOP of 20% of the total mass of PVC and reinforcing agent, performing hydrophobic modification in an oven at 100°C for 2 hours, and then mixing with PVC at 60°C Carry out the plasticizing reaction in an oven for 2 hours to obtain the plasticized modified mixture;

[0035] (2) Internal mixing: set the temperature of the internal mixer to 165°C, add the plasticized modified mixture into the internal mixer, and internally mix at a speed of 10 rpm for 10 minutes to obtain a flake product, which is crushed by a high-speed pulveriz...

Embodiment 2

[0038] A method for improving PVC heat stability and flame retardancy, the method comprises the steps,

[0039] (1) Hydrophobic and plasticizing modification: Take dry nano-magnesium borate / lignin composite material (mass ratio of magnesium borate to activated mass is 1:0.2, activated lignin mechanical solid-phase reaction activation time is 1.0h) as reinforcement Addition of reinforcing agent is 5% of the total mass of PVC and reinforcing agent, adding stearic acid of 10% of the total mass of PVC and reinforcing agent, carrying out hydrophobic modification in an oven at 90°C for 1.h, and then mixing with PVC Mix in an oven at 100°C for plasticizing reaction for 1 hour to obtain a plasticized modified mixture;

[0040] (2) Internal mixing: set the temperature of the internal mixer to 160°C, add the plasticized modified mixture into the internal mixer, and internally mix at a speed of 10 rpm for 10 minutes to obtain a flake product, which is crushed by a high-speed pulverizer t...

Embodiment 3

[0043] A method for improving PVC heat stability and flame retardancy, the method comprises the steps,

[0044] (1) Hydrophobic and plasticizing modification: Take dry nano-magnesium borate / lignin composite material (mass ratio of magnesium borate to activated mass is 1:1.5, activated lignin mechanical solid-phase reaction activation time is 1.5h) as reinforcement Addition of reinforcing agent is 10% of the total mass of PVC and reinforcing agent, adding dibutyl phthalate of 30% of the total mass of PVC and reinforcing agent, and carrying out hydrophobic modification in an oven at 90-120°C 3 .h, and then mixed with PVC in an oven at 90°C for plasticizing reaction for 3 hours to obtain a plasticized modified mixture;

[0045] (2) Internal mixing: set the temperature of the internal mixer to 190°C, add the plasticized modified mixture into the internal mixer, and internally mix at a speed of 10 rpm for 10 minutes to obtain a flake product, which is crushed by a high-speed pulver...

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Abstract

The invention discloses a method capable of improving thermostability and flame retardance of PVC through a nano magnesium borate / lignin composite material. The method includes following steps: (1), using dioctyl phthalate (DOP) as a plasticizer to hydrophobically modify the composite material; (2), well mixing the hydrophobically modified composite material with PVC powder, and performing plasticizing modification; (3), banburying a mixed material obtained by plasticizing modification in a banbury mixer; (4), performing hot-press forming on a mixed material obtained by banbury to obtain a PVCformed material. The composite material synthesized in situ and DOP are used as an enhancer and a plasticizer respectively, so that thermostability and flame retardance of the PVC formed material areimproved remarkably.

Description

technical field [0001] The invention belongs to the technical field of PVC, and in particular relates to a method for improving the thermal stability and flame retardancy of PVC. Background technique [0002] Magnesium borate nanomaterials have good physical and chemical properties, such as light weight, high toughness, wear resistance, strong alkali resistance, oxidation resistance, corrosion resistance, high temperature resistance, and good insulation. After surface modification, It can be used as a reinforcing agent, anti-wear agent, etc. in functional materials such as magnesium-aluminum alloys, ceramic matrix composites, plastics, and oil products. When magnesium borate nanomaterials are used as reinforcing components of thermoplastic polymer materials, the mechanical strength, weather resistance, flame retardancy, and anti-corrosion properties of the matrix materials can be improved. [0003] Lignin is one of the three main components of lignified plants. Its content ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08L97/00C08K9/04C08K3/38
CPCC08K2003/387C08K2201/011C08L27/06C08L2201/02C08L2201/08C08L97/005C08K9/04C08K3/38
Inventor 张燕娟吴浩然黄祖强张武相胡华宇覃宇奔
Owner GUANGXI UNIV
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