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High-performance modified polyformaldehyde and preparation method thereof

A technology for copolyoxymethylene and trioxymethylene, applied in the field of modified copolyformaldehyde and its preparation, can solve the problems of small oxygen index, poor flame retardancy, poor thermal stability effect, etc., and achieve the effect of improving thermal stability

Active Publication Date: 2012-10-03
定州旭邦新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyoxymethylene has low impact toughness, high notch sensitivity, poor heat resistance, and poor flame retardancy. It burns slowly when exposed to fire, and has a small oxygen index. Even if flame retardants are added, satisfactory requirements cannot be met. In addition, the weather resistance is not ideal. Add stabilizer for outdoor application
The existence of these shortcomings has greatly restricted its development. At present, there are many modified polyoxymethylene products on the market, all of which are reinforced, toughened, wear-resistant and weather-resistant by means of internal modification or external modification. , flame retardant and other modifications to expand its application in special fields
Although the thermal stability of polyoxymethylene can be enhanced to some extent by adding stabilizers, flame retardants and other blending methods for modification, there are disadvantages such as poor compatibility of blends and poor thermal stability effects.

Method used

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  • High-performance modified polyformaldehyde and preparation method thereof
  • High-performance modified polyformaldehyde and preparation method thereof
  • High-performance modified polyformaldehyde and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 0.195 mol of paraformaldehyde purified by water removal into a dry reactor protected by nitrogen, heat the reactor in an oil bath at 75°C, add 8.13×10 dioxane -3 mol, then add 2,2'-[[2,2-bis[(oxiranylmethoxy)methyl]-1,3-propylene]bis(oxymethylene)]bis-cyclo Oxyethane 2.03×10 -3 mol (1% of the total amount of monomers in moles), fully stirred for 20 minutes, mixed evenly and added boron trifluoride ether 1.026×10 -4 mol, after reacting for 1.5h, add 4.1×10 -4 mol triethylamine and 20ml cyclohexane to terminate the reaction. After washing, filtering, and drying, 16.589 g of the crude product was obtained, to which 50 mL of DMF solution containing 0.64 mol of triethylamine was added for post-treatment at 160 °C, cooled to room temperature after 1 h, and the resulting product was vacuum-dried to obtain 10.639 g of white powdered polymer.

[0039] The test process of embodiment 2-4 is the same as embodiment 1, only changes initiator addition, and experimental result ...

Embodiment 8

[0041] The molecular weight and physical properties of the polyoxymethylene copolymer prepared in Example 8 are shown in Table 3.

[0042] The influence of table 1 initiator addition amount on polymer product thermal stability

[0043] Example

[0044] Table 2 has at least two monomer additions of epoxy groups on the impact of polymerization product thermal stability

[0045]

[0046] Parameters and properties of the polyoxymethylene copolymer prepared by the embodiment 8 of table 3

[0047] Molecular weight (viscosity average)

[0048] figure 1 For comparing the TGA curve of the polyoxymethylene copolymer that embodiment 1, embodiment 1 and embodiment 8 obtain. It can be seen from the figure that the thermal stability of polyoxymethylene is 1<2<3, indicating that after adding monomers with at least two epoxy groups, the thermal stability of polyoxymethylene is greatly improved, and the increase has at least The added amount of the monomer with two epox...

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Abstract

The invention relates to a high-performance modified polyformaldehyde and a preparation method of the high-performance modified polyformaldehyde. The modified polyformaldehyde is obtained by copolymerization of trioxymethylene, dioxolane and a monomer with at least two epoxide groups. The modified polyformaldehyde obtained by the method has high thermal stability.

Description

technical field [0001] The invention relates to the field of copolymerization modification of polymer materials, in particular to a modified polyoxymethylene and a preparation method thereof. prepared by copolymerization of monomers. Background technique [0002] The scientific name of POM is polyoxymethylene (referred to as POM). Comonomers are polymerized under the initiation of initiators, and now the main comonomers are ethylene oxide, dioxopentaane, dioxolane, etc. Polymerization catalysts generally use cationic catalysts as catalysts for copolymerization reactions, and more common ones such as boron trifluoride or its ether compounds are widely used in industrial production. Diepoxide or polyepoxy compounds have the common properties of epoxy compounds. Due to the existence of ring tension, epoxides have high reactivity, are sensitive to acids and nucleophiles, and can react with various reagents. open loop. [0003] Polyoxymethylene is a new synthetic material hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G2/22C08G2/06
Inventor 张英伟陈亚宁孙长江潘小君
Owner 定州旭邦新材料科技有限公司
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