Flame-retardant hot melt adhesive and preparation method thereof

Abstract

The invention discloses a flame-retardant hot melt adhesive. The flame-retardant hot melt adhesive is prepared from the following components in percentage by mass: 20 to 50 percent of thermoplastic elastomer, 20 to 50 percent of tackifying resin, 8 to 27 percent of flame retardant master batch, 10 to 30 percent of synthetic wax and 1 to 5 percent of an antioxidant, wherein the flame retardant master batch comprises a nitrogen-phosphorus flame retardant and an EVA carrier. By designing the raw materials and the proportions thereof, the specific flame retardant master batch is selected to replace general flame retardant powder and has better compatibility with a hot melt adhesive formula, and the problem of non-uniform dispersion of the flame retardant does not exist. The invention discloses a preparation method of a flame-retardant hot melt adhesive. The preparation method comprises the following steps: uniformly mixing tackifying resin and a flame retardant master batch, adding a thermoplastic elastomer and synthetic wax, and carrying out mixing. Thus, the dispersion effect of the flame retardant master batch is further improved, the original performance of the hot melt adhesive is maintained, and flame-retardant performance also meets corresponding requirements.

Description

technical field [0001] The invention relates to the technical field of hot-melt adhesive preparation, in particular to a flame-retardant hot-melt adhesive and a preparation method thereof. Background technique [0002] At present, in the field of animal husbandry, in order to effectively block the infection risk of animals caused by bacteria, viruses and air pollution, mainstream companies are actively promoting air filtration devices to reduce this risk and ensure the survival rate of animals. [0003] In the air filter device, hot melt adhesive is used to bond and fix the filter material. The filter material is generally composed of organic synthetic materials, such as PP, glass fiber, etc., and most of these materials do not have flame retardant properties. Accidents, can not play a role in flame retardancy, and thus can not effectively reduce the risk of fire. [0004] The existing solution is to add a flame retardant to the hot melt adhesive to make the hot melt adhesi...

AI Technical Summary

Problems solved by technology

The existing process adopts the method of feeding and mixing all raw materials at the same time, and the flame retardant powder is very difficult to stir and disperse

In order to make the flame retardant effect meet the requirements of flame retardant grade UL-94V1-V0, it is often necessary to add a certain amount of flame retardant powder, because the compatibility of flame retardant powder and hot melt adhesive formula is poor, and because the flame retardant powder is not It is easy to disperse evenly, if it is not fully dispersed, it is easy to be wrapped and agglomerated to form particles, which will affect the performance of the prepared hot melt adhesive, and the flame retardant grade cannot meet the requirements. The hot melt collagen has poor bonding performance, tensile strength, and fracture Mechanical properties such as elongation are also reduced

Although it is possible to meet the requirements of the flame retardant grade by increasing the proportion of the flame retardant, the higher the proportion of the flame retardant, the less likely it is to disperse, which will further affect the performance of the hot melt collagen, and some even fail to meet the thermal requirements. The most basic bonding performance requirements of melt adhesive

In addition, because the flame retardant is not easy to stir and disperse, on the one hand, it needs to prolong the stirring time; on the other hand, when filtering, some larger particles block the filter screen, which also reduces the filtering efficiency and increases the filtering time, resulting in the overall production time Prolonged, not productive

How to solve the problem of insufficient and uneven dispersion of solid flame retardants, and realize that the hot melt adhesive can maintain the original performance without clogging the filter screen under the premise of meeting the flame retardant grade, remains to be studied

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