Why do flame retardants have precipitation problems? How to deal with it?
The key to people's fire prevention has steadily evolved into the usage of flame retardants to lessen the likelihood of fire. However, using flame retardants would lead to a lot of issues. Flame retardants, often referred to as flame retardants, fire retardants, and fire retardants, work to prevent fires via a variety of means, including heat absorption, covering effects, the prevention of chain reactions, and the smothering of gases that aren't flammable. The goal of flame retardancy is achieved by a combination of mechanisms.
The two primary categories of flame retardants are organic and inorganic, halogen and non-halogen. Bromine, phosphorus nitrogen, nitrogen, red phosphorus, and related compounds are examples of organic flame retardants. Antimony trioxide, magnesium hydroxide, aluminum hydroxide, silicon, and other flame retardant systems make up the majority of inorganic flame retardants.
Let's examine the issue of flame retardant precipitation today, as well as its resolution.
The first cause of precipitation
01 Flame retardant compatibility with PP base resin
PP resin often contains flame retardants in two different states: one is filled with a comparable filler and the other is uniformly scattered in the resin in a melted condition. There will be interfacial compatibility issues between polar flame retardants and PP since PP is a non-polar substance. The easier it is to create, the worse the interfacial compatibility.
02 The impact of temperature on flame retardant precipitation
PP has a low glass transition temperature, which refers to the process of turning a material into an amorphous entity that resembles glass. When the surrounding temperature exceeds the glass transition temperature, no change in behavior occurs as the temperature rises. In order for the small molecule flame retardant with poor compatibility with PP resin to readily overcome the resistance and migrate to the surface, the thermal movement of the fixed segment will be accelerated. This is also the reason why after a workpiece has been held for a while, precipitation may occasionally form on its surface.
Second, the answer
01 Improving the interface between flame retardants and PP by adding strong polar groups (such as amino groups, carboxyl groups, epoxy groups, etc.) can significantly lessen the issue of flame retardant precipitation.
02 Lower the temperature to weaken the movement between chain segments or boost the degree of polymerization of flame retardant molecules to narrow the molecular weight distribution. This will increase the migration resistance between flame retardants and resins and decrease the migration rate of low-molecular-weight flame retardants.
Although the non-precipitation flame retardant PP does not fully eliminate precipitation, it significantly lowers its mobility. Low-cost anti-precipitation is still a topic that has to be developed for existing flame-retardant PP materials since the non-precipitation flame-retardant PP is frequently reliant on excessively expensive technological expenses.
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