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Application of rare earth hydroxide as flame-retardant synergist in high molecular materials

A technology of rare earth hydroxides and polymer materials, which is applied in the field of flame-retardant polymer materials to achieve the effects of improving flame-retardant effects, reducing dosage, and improving flame-retardant levels

Inactive Publication Date: 2011-09-07
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of rare earth hydroxide as a flame retardant synergist in polymer materials for the disadvantages of existing halogen-free flame retardants added in polymer materials, especially the problem of flame retardant efficiency. application

Method used

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  • Application of rare earth hydroxide as flame-retardant synergist in high molecular materials
  • Application of rare earth hydroxide as flame-retardant synergist in high molecular materials
  • Application of rare earth hydroxide as flame-retardant synergist in high molecular materials

Examples

Experimental program
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Effect test

Embodiment 1

[0018] First, ammonium polyphosphate (APP) and pentaerythritol (PER) are mixed in a mass ratio of 2:1 to form a mixture of APP and PER. The mixture of APP and PER whose mass ratio accounts for 23% of the total mass of the system is weighed, and then the mass ratio is weighed. The 2% lanthanum hydroxide is put into a mixer and fully stirred evenly to obtain an intumescent flame retardant system containing the lanthanum hydroxide flame retardant synergist. Then weigh the polypropylene (PP) and 5% maleic anhydride grafted polypropylene (MAPP) that the mass percentage accounts for system gross mass 70%, it and the intumescent flame retardant material that contains flame retardant synergist are in 80 ℃ oven After intermediate treatment for 4-20 hours, it is kneaded, pelletized and pelletized by a twin-screw extruder at 170°C to obtain flame-retardant polypropylene pellets. Finally, the flame-retardant polypropylene particles were added to a plastic injection molding machine, and st...

Embodiment 2

[0021] According to the same proportion and process of adding single rare earth hydroxide as in Example 1, the effect of adding mixed rare earth hydroxide on the flame retardant performance of the polypropylene flame retardant system was compared. The test results show that the system with the addition of mixed rare earth hydroxides can not only burn vertically up to UL-94V-0 level, but also the limit oxygen index value is significantly higher than that of the blank sample without addition, reaching 30.5, which is lower than that without the addition of flame retardant synergists. The blank sample is 3.5 units higher, indicating that the material is more difficult to be ignited than the blank sample without flame retardant synergist, and the risk of system combustion is reduced.

Embodiment 3

[0023] After accurately weighing the lanthanum hydroxide and lanthanum phosphate ratio of 3:2 by weight, the two are fully mixed to form a mixture of lanthanum hydroxide and lanthanum phosphate. Using the same proportion and process as in Example 1 for adding a single rare earth hydroxide, the lanthanum hydroxide with a mass ratio of 2% is replaced by the mixture of lanthanum hydroxide and lanthanum phosphate prepared in this example, and added to the system The flame retardant performance is measured, and the vertical combustion of the system can also reach the UL-94V-0 level, and the limiting oxygen index value reaches 31.5, which is 4.5 units higher than the blank sample without the flame retardant synergist, and the flame retardant effect is remarkable.

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Abstract

The invention relates to application of rare earth hydroxide as flame-retardant synergist in high molecular materials, characterized in that: the rare earth hydroxide as flame-retardant synergist in an ultrafine particle form of the micron order and below is added to the high molecular materials; the high molecular materials comprise polyolefine, polyester or phenyl polymer; the rare earth hydroxide accounts for 0.5-5wt.% of the system by weight; a halogen-free flame retardant accounts for 14.5-45wt.% of the system by weight; and the high molecular materials account for 50-85wt.% of the system by weight. The rare earth hydroxide has the advantages of obviously improving the flame-retardant effect of the high molecular materials, elevating the flame-retardant grades of the high molecular materials, and being suitable for flame retardance of polyolefine, polyester or phenyl polymer high molecular materials.

Description

technical field [0001] The invention relates to the application of a rare earth hydroxide as a flame retardant synergist in polymer materials, belonging to the field of flame retardant polymer materials. Background technique [0002] Because polymer materials have unique properties such as energy saving, light weight, and good processing performance, they are widely used in various fields of the national economy. However, because most polymer materials are flammable, burn quickly, generate high heat, produce large amounts of smoke, and release toxic gases, they pose a serious threat to people's lives and property. At present, flame retardants are mainly used for polymer materials at home and abroad. Flame retardants are a kind of additives that can prevent polymer materials from igniting or inhibit flame propagation. The use of flame retardant materials is a strategic measure to prevent and reduce fires. One of them is a major initiative related to "environment and human be...

Claims

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Application Information

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IPC IPC(8): C08L23/00C08L67/00C08K9/02C08K3/22C08K3/32C08K5/098
Inventor 孔繁清闫慧忠李金熊玮李宝犬王利
Owner BAOTOU RES INST OF RARE EARTHS
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