Preparation method for thin flame-retardant non-woven fabric applied to vehicles

[0021] Example 1:

[0022] The first step, the preparation of the base cloth

[0023] Through opening, carding, laying, and needle punching into polyester fibers, and then laying viscose fibers on the upper layer and acupuncture and compounding them into base fabric, the needle punching speed is 1300 times/min, and the needle density is 2500 pieces/m , so that the polyester fibers are evenly and firmly connected together. The total weight of the base fabric is 100-120g/m 2 , and the weight percentage of polyester fiber is 80-95%, and the weight percentage of viscose fiber is 5-20%.

[0024] The second step, impregnation

[0025] The flame retardant and the water-based glue are uniformly mixed to form a flame-retardant glue, wherein the water-based glue accounts for 40-60% by weight and the flame retardant accounts for 40-60% by weight. The flame retardant glue is mixed with color paste and water to obtain an impregnating liquid, and the base fabric obtained by acupuncture is soaked in the impregnating liquid.

[0026] Part three, dusting

[0027] The impregnated base cloth is dusted with powder particles by the vibration of a duster to obtain the flame-retardant non-woven fabric of the present invention, and the obtained flame-retardant non-woven fabric has a gram weight of 100-150 g/m 2. The powder particles are a mixture of polyethersulfone resin and phenolic resin, and the weight percentage of polyethersulfone resin is 80-90%, and the weight percentage of phenolic resin is 10-20%.

[0028] In order to obtain a thin flame retardant non-woven fabric with high flame retardant performance and high bonding strength, the best ratio was obtained by orthogonal experiments of three factors and three levels. Ether sulfone resin (C) is an investigation factor, and each factor takes 3 levels. The experimental design and result analysis are shown in Table 1. figure 1 shown.

[0029] Table 1

[0030]

[0031] Combined with Table 1, figure 1 The analysis results show that among the 9 sets of experimental results, the flame retardant fresh fruit produced by Experiment 7 is the best. The weight percentage of fiber is 80%; the weight percentage of flame retardant in the flame retardant glue is 40%, and the weight percentage of glue is 60% accordingly; the weight percentage of polyethersulfone resin in the mixed powder particles is 90%, correspondingly phenolic resin. The weight percentage is 10%.

[0032] Embodiment 2:

[0033] The first step, the preparation of the base cloth

[0034] Through opening, carding, laying, and needle punching into polyester fibers, and then laying viscose fibers on the upper layer and acupuncture and compounding them into base fabric, the needle punching speed is 1300 times/min, and the needle density is 2500 pieces/m , so that the polyester fibers are evenly and firmly connected together. The total weight of the base fabric is 100-120g/m 2 , and the weight percentage of polyester fiber is 60-80%, and the weight percentage of viscose fiber is 20-40%.

[0035] The second step, impregnation

[0036] The flame retardant and the water-based glue are uniformly mixed to form a flame-retardant glue, wherein the water-based glue accounts for 40-60% by weight and the flame retardant accounts for 40-60% by weight. The flame retardant glue is mixed with color paste and water to obtain an impregnating liquid, and the base fabric obtained by acupuncture is soaked in the impregnating liquid.

[0037] Part three, dusting

[0038] The impregnated base cloth is dusted with powder particles by the vibration of a duster to obtain the flame-retardant non-woven fabric of the present invention, and the obtained flame-retardant non-woven fabric has a gram weight of 100-150 g/m 2. The powder particles are a mixture of polyethersulfone resin and phenolic resin, and the weight percentage of polyethersulfone resin is 80-90%, and the weight percentage of phenolic resin is 10-20%.

[0039] In order to obtain a thin flame retardant non-woven fabric with high flame retardant performance and high bonding strength, the best ratio was obtained by orthogonal experiments of three factors and three levels, in which polyester fiber (A), glue (B), polyethersulfone resin (C) is an investigation factor, and each factor takes 3 levels. The experimental design and result analysis are shown in Table 2, as shown in Figure 2.

[0040] Table 2

[0041]

[0042] Combined with Table 2, figure 2The analysis results show that among the 9 sets of experimental results, the flame retardant fresh fruit produced by Experiment 6 is the best, and its optimal level combination is A2B3C1, that is, the optimal process ratio is: the weight percentage of viscose fiber is 30%, and the polyester fiber is 30% by weight. The weight percentage of fiber is 70%; the weight percentage of flame retardant in the flame retardant glue is 60%, and the corresponding weight percentage of glue is 40%; the weight percentage of polyethersulfone resin in the mixed powder particles is 80%, and the corresponding weight percentage of phenolic resin The weight percentage is 20%.

[0043] The comparison of the experimental results of the optimal process ratio of Example 1 and Example 2 shows that although the amount of flame retardant contained in the immersion liquid in Experiment 7 of Example 1 is less than that in Experiment 6 of Example 2, in the mixed powder particles sprinkled The content of polyethersulfone resin is relatively high. Due to the good viscosity and internal cohesion of the polyethersulfone resin, the powder particles of the polyethersulfone resin are used to improve the adhesion between the base fabric and aluminum foil, glass fiber and foam, and the polyethersulfone resin also has self-extinguishing properties without adding any The flame retardant has excellent flame retardancy, so the nonwoven fabric obtained in Example 1 has high flame retardancy. On the contrary, the content of polyethersulfone resin in the mixed powder particles in the dusting process of experiment 7 of Example 2 is relatively low, but the content of flame retardant in the impregnating liquid is relatively high, and the content of viscose fiber in the base fabric is relatively high , which can be combined with more flame retardants to adsorb flame retardants into polyester fibers.

[0044] The flame retardant non-woven fabric obtained by the invention is added with viscose fiber, and the base fabric of the same size is lighter than that without viscose fiber, and when burning, the burning area will not sag, the flame is perpendicular to the base fabric, and the burning speed is reduced; By adding flame retardants, the combustion speed is reduced; the polyethersulfone resin in the dusted particles has self-extinguishing properties, which further reduces the combustion speed; the macromolecular structure of the phenolic resin in the dusted particles has a large number of polar groups, Endowed with excellent adhesion, after cross-linking and curing, it can ensure the stability and durability of the bonding interface, so that it is not easy to melt and drip at the ignition point, ensure that the flame is perpendicular to the base fabric, and prevent the flame from drilling into the inner layer of the base fabric.

[0045] The weight of traditional flame retardant non-woven fabric is 1000~1500g/m 2 , the flame retardant non-woven fabric obtained by the present invention is relatively thin, and the gram weight is 100-150 g/m 2. The horizontal burning speed of the thin flame-retardant non-woven fabric obtained by the invention is less than the limit specified in GB8410-(burning characteristics of automotive interior materials) (≦50mm/min), which can meet its application in automobile engine covers and save materials at the same time. , Reduce production costs.