Flame retardant polyolefin and preparation method and product thereof

Abstract

The invention discloses flame retardant polyolefin and a preparation method and a product thereof. The flame retardant polyolefin comprises the following components in parts by weight: 100 parts of polyolefin resin, 5-64 parts of flame retardant, 1-60 parts of flame retardant synergist, 0-50 parts of additive, 0-100 parts of stuffing and 0-10 parts of other assistants. The sum of the flame retardant and the flame retardant synergist in parts by weight is 25-65 parts. The flame retardant synergist is ammonium salt containing at least one NH<4+>. The other additives are charring agents and / or stabilizers. According to the invention, through reasonable selection of the flame retardant synergist, the flame retardant efficiency of hypophosphite or alkyl hypophosphite flame retardant can be greatly improved in polyolefin resin, and the use amount of the hypophosphite or alkyl hypophosphite flame retardant in polyolefin resin can be greatly reduced, so that polyolefin resin can reach a high flame retardant level on the condition that the addition of the flame retardant is low.

Description

technical field [0001] The invention relates to the field of flame retardant polymers, in particular to a flame retardant polyolefin and its preparation method and product. Background technique [0002] Among the existing flame-retardant modified polyolefins, in order to meet the requirements of non-halogenation, it is necessary to select phosphorus, nitrogen or their compound systems. The most commonly used phosphorus-containing flame retardants and their compositions mainly include microencapsulated red phosphorus, phosphoric acid esters, and intumescent flame-retardant systems mainly composed of ammonium polyphosphate. These flame retardant systems all achieve flame retardancy through a solid phase mechanism. Compared with the traditional bromine-antimony compound flame retardant system, the phosphorus-containing flame retardant with solid phase flame retardant mechanism and its compound flame retardant system have the disadvantage of low flame retardant efficiency. [...

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Problems solved by technology

Compared with the traditional bromine-antimony compound flame retardant system, the phosphorus-containing flame retardant with solid phase flame retardant mechanism and its compound flame retardant system have the disadvantage of low flame retardant efficiency

[0003] Phosphinate is a kind of phosphorus-containing flame retardant that can act in the gas phase, but it also has the problem of low flame retardant efficiency. When no flame retardant synergist is compounded, it is necessary to add a large amount of phosphinate to achieve UL 94V-0 flame retardant

Patents CN 1660857 B and CN 100348653 C disclose a combination of alkyl phosphinate and flame retardant synergist containing amino ring structure, although these flame retardant synergists can play a certain degree of synergistic effect effect, but its synergistic degree is limited, and therefore the amount of phosphinate is still high, which greatly increases the cost of the flame retardant composition

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