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What is the flame-retardant modification of EVA and EVA foam sheets?

Views: 201     Author: zhongle     Publish Time: 2023-04-18      Origin: Site


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What is the flame-retardant modification of EVA and EVA foam sheets?

EVA or EVA foam sheet, like most polymers, burns easily, produces a lot of heat, and produces a lot of smoke. It emits hazardous fumes, severely limiting its application.

The EVA flame retardant system is primarily based on halogen trioxide thermoplastic elastomers and is used in conjunction with an antimony system. When the halogen flame retardant is consumed, hazardous and corrosive gases and a substantial amount of smoke are easily produced. which is prone to causing subsequent injury.

With the advancement of people's environmental and health concerns, as well as the implementation of relevant legislation and research, the development of halogen-free, environmentally friendly flame retardant polymer materials has become a popular issue and trend today. When the polymer in the tumescent flame retardant melamine polyphosphate (MPP)/pentaerythritol (PER) system burns, it forms a homogenous tumescent carbon layer on its surface.

People have increasingly realized that hydrotalcite (LDH) has a flame retardant function. When LDH is burned or heated, it loses interlayer water, carbonate, and hydroxyl groups and absorbs a significant amount of heat, resulting in a flame-retardant action.

The breakdown product has a large specific surface area and high alkalinity, allowing it to absorb the acid gas and smoke emitted during thermal decomposition over time and perform smoke suppression and elimination functions. Hydrotalcite and intumescent flame retardants are used in conjunction with modified EVA thermoplastic elastomers. The synergistic impact of the two is employed to increase the flame retardant performance of EVA foam, resulting in the preparation of a green flame retardant material with high efficiency, low cost, low toxicity, low smoke, and no environmental damage.

The flame retardant capabilities of EVA/MPP/PER/LDH composites were investigated using the melt blending process. The MPP/PER and LDH systems exhibit a synergistic flame retardant effect, according to the results. When the mass ratio of EVA/LDH is 60/20/10/10, this promotes the production of a continuous and dense carbon layer and can improve the residual rate of EVA thermal degradation. The composite material's flame retardant grade is Ul 94V-0, and the limiting oxygen index is 30.6%.

The initial decomposition temperature was 316 °C in the thermogravimetric analysis, and the maximum exothermic peak temperature on the DSC curve was 360 °C, which was about 50–100 °C higher than the existing IFR decomposition temperature and could meet the processing requirements of almost all engineering plastics. At the same time, Timer is insoluble in water and most organic solvents and lacks the hygroscopicity disadvantage of regularly used IFR. Trimmers can thus be utilized in the high-tech electronic and electrical industries for flame-retardant polymers and metals. This chemical is combined with ammonium polyphosphate (APP) and melamine (MA) to produce EVA, an intumescent flame retardant combination. Trimmer:APP: MA = 100:32:49 is the flame retardant mass ratio.

The LOI of the flame retardant system can achieve around 30% when the amount of mixed flame retardant is 30% (mass fraction) and the flame retardancy is UL94V-0 grade, lowered by 50%–70%. 30%-40% and 50%. It has good flame-retardant properties. Furthermore, after burning, a homogenous and dense carbon layer with a closed-cell structure was generated, with pore sizes ranging from 5 to 30 um and pore walls ranging from 6 to 9 um.

Fumed Si2 synergistic saline coupling agent KH550 was used to alter magnesium hydroxide to create halogen-free flame-retardant EVA composites (KH550-MH). According to the data, kH550-MH accounts for 47% of the system and Sio2 accounts for 8%. The system has a V-0 flame retardant rating. When the break elongation reaches 168%. If you require EVA foams, please contact us.

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