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Adhesive and modified EVA (ethylene vinyl acetute) foaming composite for automobiles

A foaming composition and modification technology, applied in the field of expansion materials, can solve problems such as low strength, shedding, and limited application, and achieve the effects of good adhesion, uniform cells, and high volume expansion rate

Active Publication Date: 2011-09-14
广东时利和汽车材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, EVA foam material has poor adhesion and low strength on steel plate or galvanized plate, and it is easy to deform or even fall off in the cavity for a long time, which limits its application in automobile sound insulation and vibration reduction.
[0003] Chinese patent CN1982363 discloses a formula of shock-absorbing EVA foamed profile and its manufacturing method, and Chinese patent CN1982364 discloses a formula of high-elastic EVA foamed profile and its manufacturing method, but its application is mainly used for EVA soles, and its design EVA foam profiles have poor adhesion to automobile body steel sheets and galvanized sheets, which cannot meet the performance requirements of automobile cavity assembly for foam materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1 (by weight): 60 parts of EVA resin; 10 parts of epoxy resin; 6 parts of AC; 1 part of zinc oxide; 1 part of DCP; 2 parts of dicyandiamide; PN-23); 4 parts of petroleum resin; 15 parts of nano calcium carbonate.

[0011] In Example 1 mentioned above, the EVA resin is first rolled with a two-roller mill at 80°C. After the EVA resin is completely melted, epoxy resin, foaming agent AC, and foaming accelerator zinc oxide are added in sequence. , tackifier petroleum resin and filler nano-calcium carbonate for initial mixing, after mixing evenly, add cross-linking agent DCP, curing agent dicyandiamide, curing accelerator imidazole adduct mixing for a period of time, and then mix at about 90 ° C Extrusion molding, the formed foaming material is baked in an electric heating blast drying oven at 160°C for 20 minutes, then foams, cooled to room temperature, and cut into standard samples for performance testing after standing for 72 hours. The results show that the fo...

Embodiment 2

[0012] Embodiment 2 (by weight): 65 parts of EVA resin; 5 parts of epoxy resin; 8 parts of AC; 1.5 parts of zinc stearate; 1.5 parts of DCP; Japan Ajicure PN-23); terpene resin 2 parts; nanometer calcium carbonate 15 parts.

[0013] In Example 2 mentioned above, the EVA resin is first rolled with a two-roller mill at 80°C. After the EVA resin is completely melted, epoxy resin, foaming agent AC, and foaming accelerator stearin are added in turn. Zinc acid, tackifier terpene resin and filler nano-calcium carbonate are initially mixed, and after mixing evenly, add cross-linking agent DCP, curing agent dicyandiamide, curing accelerator imidazole adduct and mix for a period of time, and then mix in Extruded at around 90°C, the formed foamed material is baked in an electric heating blast drying oven at 160°C for 20 minutes, then foamed, cooled to room temperature, left for 72 hours, and then cut into standard samples for performance testing. The results show that the foaming compos...

Embodiment 3

[0014] Embodiment 3 (by weight): 65 parts of EVA resins; 10 parts of epoxy resins; 10 parts of AC; 1 part of zinc oxide; 0.5 parts of zinc stearate; 1.5 parts of DCP; 1 part of finished product (Japan Ajicure PN-23); 2 parts of petroleum resin; 2 parts of terpene resin; 5 parts of nano calcium carbonate.

[0015] In Example 3 mentioned above, at 80°C, the EVA resin was first rolled with a two-roller mill, and after the EVA resin was completely melted, epoxy resin, foaming agent AC, and foaming accelerator zinc oxide were added in sequence. Carry out primary mixing with zinc stearate, tackifier petroleum resin and terpene resin, filler nano-calcium carbonate, after mixing evenly, add cross-linking agent DCP, curing agent dicyandiamide, curing accelerator imidazole adduct to mix Refined for a period of time, then extruded at about 90°C, the formed foam material was baked in an electric heating blast drying oven at 160°C for 20 minutes, then foamed, cooled to room temperature for...

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Abstract

The invention discloses adhesive and modified EVA (ethylene vinyl acetute) foaming composite for automobiles. The foaming composite consists of the following components in parts by weight: 60-80 parts of EVA resin; 5-15 parts of epoxy resin; 5-25 parts of foaming agent; 0.1-5 parts of foaming accelerator; 0.1-5 parts of cross-linking agent; 0.1-5 parts of curing agent; 0.1-5 parts of curing accelerator; 0.1-5 parts of tackifier and 0.1-20 parts of filler. The obtained foaming composite can foam at the temperature range of 140-210 DEG C; and with uniform foam holes, high volume expansion ratioand excellent adhesive force with steel sheets or galvanized steel sheets, the adhesive and modified EVA (ethylene vinyl acetute) foaming composite can fill or seal the cavity of an automobile body and play sound-insulation and vibration-reduction roles.

Description

technical field [0001] The invention relates to expansion materials, in particular to an adhesive modified EVA foam composition for automobiles. Background technique [0002] In recent years, adhesives and damping materials have attracted more and more attention. For example, in the automotive industry, the bypass cavity of the car body will generate high-speed airflow when driving at high speed, which will bring strong noise and vibration to passengers and drivers. Therefore, the expansion materials with light weight, good adhesion, good sound absorption and vibration damping effect are more and more widely used in the automotive industry, and the requirements are getting higher and higher. Such an intumescent material must simultaneously satisfy the above-mentioned requirements. However, it is very difficult to prepare a high expansion ratio without sacrificing the adhesion of the material and maintaining the uniformity of the material after expansion. EVA (ethylene-vin...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L63/00C08J9/10C08K13/02
Inventor 吴子刚高之香李士学王永明李建武郭亚昆朱兴明张卫军王艳芳
Owner 广东时利和汽车材料有限公司
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