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High-temperature-resistant EVA (ethylene-vinyl acetate) hot-melt adhesive for woodwork coating and preparation method thereof

A hot-melt adhesive and high-temperature-resistant technology, which is applied in the field of adhesives, can solve the problems of insufficient high-temperature resistance, cracking, and warping of hot-melt adhesives, and achieve the effect of ensuring the bonding strength and increasing the heat-resistant temperature

Active Publication Date: 2013-12-25
WUXI WANLI ADHESION MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the hot-melt adhesives used in the domestic market have no problems with the bonding strength and fastness of woodwork-coated products at room temperature, but after long-distance transportation in containers, the decorative paper and veneer coated on MDF And other materials are obviously warped and cracked, especially at the curved back and grooves. This is because the temperature in the container is sometimes as high as 70 degrees, and the high temperature resistance of the hot melt adhesive is not enough.
[0004] In view of the lack of high temperature resistance of existing hot melt adhesives, the present invention provides a high temperature resistant woodworking coated hot melt adhesive, through reasonable selection of types of EVA (ethylene-vinyl acetate copolymer), tackifying resin and wax diluent And the ratio, not only guarantee the bonding strength of hot melt adhesive, but also improve the heat resistance temperature of hot melt adhesive, can be widely used in actual production

Method used

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  • High-temperature-resistant EVA (ethylene-vinyl acetate) hot-melt adhesive for woodwork coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Mixing: Take 50 parts of EVA (ethylene-vinyl acetate copolymer), 18 parts of terpene resin, C 9 Add 20 parts of petroleum resin, 5 parts of low-molecular toughening agent, 6.2 parts of polyethylene wax, and 10100.8 parts of CHINOX into the mixer, and knead at 90°C for 30 minutes at a speed of 20 r / min;

[0022] (2) Material extrusion: put the uniformly mixed material obtained in step (1) into a twin-screw extruder for extrusion operation, and the extruded product is cooled at room temperature and granulated by a granulator to obtain a product with high temperature resistance EVA hot melt adhesive J1 for woodworking cladding; its basic physical properties are shown in Table 1. The temperatures of the inlet section, the middle section and the outlet section of the extruder were controlled at 100°C, 135°C, and 120°C, respectively.

Embodiment 2

[0024] (1) Mixing: Take 58 parts of EVA (ethylene-vinyl acetate copolymer), C 5 14.5 parts of petroleum resin, C 9 10 parts of petroleum resin, 8 parts of modified phenolic resin, 2 parts of low-molecular toughening agent, 5 parts of polyethylene wax, 2 parts of paraffin wax, 0.5 parts of antioxidant were added to the mixer, and mixed at 95°C for 25 minutes with a stirring speed of 30r / min;

[0025] (2) Material extrusion: put the uniformly mixed material obtained in step (1) into a twin-screw extruder for extrusion operation, and the extruded product is cooled at room temperature and granulated by a granulator to obtain a product with high temperature resistance The basic physical properties of EVA hot melt adhesive J2 for woodworking coating are shown in Table 1; the temperature of the entrance section, middle section and exit section of the extruder is controlled at 105°C, 135°C, and 125°C, respectively.

Embodiment 3

[0027] (1) Mixing: Take 55 parts of EVA (ethylene-vinyl acetate copolymer), C 5 17.5 parts of petroleum resin, C 9 15 parts of petroleum resin, 5 parts of modified phenolic resin, 2 parts of low molecular toughening agent, 3 parts of Sasol wax, 2 parts of microcrystalline wax, 0.5 part of antioxidant were added to the mixer, and mixed at 100 ° C for 20 minutes, and the stirring speed was 25r / min;

[0028] (2) Material extrusion: put the uniformly mixed material obtained in step (1) into a twin-screw extruder for extrusion operation, and the extruded product is cooled at room temperature and granulated by a granulator to obtain a product with high temperature resistance The basic physical properties of EVA hot melt adhesive J3 for woodworking coating are shown in Table 1; the temperature of the entrance section, middle section and exit section of the extruder is controlled at 100°C, 140°C, and 130°C, respectively.

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Abstract

The invention relates to an EVA (ethylene-vinyl acetate) hot-melt adhesive and a preparation method thereof, particularly a high-temperature-resistant EVA hot-melt adhesive for woodwork coating and a preparation method thereof, belonging to the technical field of adhesives. The preparation method comprises the following steps: adding EVA copolymer, tackifying resin, wax, low-molecular toughener and antioxidant into a mixer, heating and mixing while stirring, adding the mixed material into a double screw extruder, and extruding to obtain the high-temperature-resistant EVA hot-melt adhesive for woodwork coating. By reasonably selecting the varieties and ratio of EVA, tackifying rein and wax diluter, the invention ensures the adhesive strength of the hot-melt adhesive, enhances the temperature resistance of the hot-melt adhesive, and can be widely used in real production.

Description

technical field [0001] The invention relates to an EVA hot-melt adhesive and a preparation method thereof, in particular to an EVA hot-melt adhesive for high-temperature-resistant woodworking coating and a preparation method thereof, belonging to the technical field of adhesives. Background technique [0002] Hot melt adhesive has the reputation of green adhesive because it does not contain solvents and is pollution-free. In recent years, hot melt adhesives have developed rapidly and are widely used. In particular, EVA (ethylene-vinyl acetate copolymer) hot-melt adhesives have a large demand and a wide range of applications, accounting for about 80% of the total consumption of hot-melt adhesives. The rapid development of hot-melt adhesives is mainly due to the fact that hot-melt adhesives are different from thermosetting, solvent-based, and water-based adhesives. They do not contain solvents, have no pollution, do not need heating and curing, have no drying process, consume...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J123/08C09J11/06C09J11/08
Inventor 周其平王美健李洁玲
Owner WUXI WANLI ADHESION MATERIALS