Hot melt adhesive for bonding metal material and polyolefin material

Abstract

The present invention relates to the technical field of hot melt adhesives, and provides a hot melt adhesive for bonding a metal material and a polyolefin material, the hot melt adhesive comprises the following components by mass: 30-40 parts of a polyolefin elastomer, 15-25 parts of an ethylene-vinyl acetate copolymer, 8-15 parts of a compatibilizer, 15-25 parts of a tackifier, 10-20 parts of a viscosity modifier, 0.5-2 parts of an antioxidant, and 5-15 parts of an adhesion promoter, the adhesion promoter comprises alkyl methacrylate and carboxylic acid in a mass ratio of (1: 9)-(9: 1). According to the technical scheme, the problem of poor bonding effect of the hot melt adhesive for bonding the metal material and the polyolefin material in the related technology is solved.

Description

Technical Field

[0001] The invention relates to the technical field of hot melt adhesives, and in particular to a hot melt adhesive for bonding metal materials and polyolefin materials. Background Art

[0002] Hot melt adhesive is a plastic adhesive, generally composed of polymer main material, tackifier, viscosity regulator and antioxidant, etc. It is solid in itself, but its physical state changes with temperature within a certain temperature range, while its chemical properties remain unchanged. It has the advantages of being non-toxic and odorless, and is easy to package, transport and store. In addition, hot melt adhesive is widely used in bonding materials due to its simple production process, high bonding strength and fast bonding speed.

[0003] The bonding of metal materials and polyolefin materials is widely used in industry and daily life, such as automobile manufacturing, home appliance manufacturing, packaging materials, etc. However, due to the large difference in the surface properties of metal materials and polyolefin materials, the existing hot melt adhesive bonding effect is not ideal. Summary of the invention

[0004] The present invention provides a hot melt adhesive for bonding metal materials and polyolefin materials, which solves the problem of poor bonding effect of the hot melt adhesive for bonding metal materials and polyolefin materials in the related art.

[0005] The technical solution of the present invention is as follows: A hot melt adhesive for bonding metal materials and polyolefin materials comprises the following components in parts by mass: 30-40 parts of a polyolefin elastomer, 15-25 parts of an ethylene-vinyl acetate copolymer, 8-15 parts of a compatibilizer, 15-25 parts of a tackifier, 10-20 parts of a viscosity regulator, 0.5-2 parts of an antioxidant, and 5-15 parts of an adhesion promoter, wherein the adhesion promoter comprises an alkyl methacrylate and a carboxylic acid in a mass ratio of 1:9-9:1.

[0006] As a further technical solution, the viscosity regulator includes one or both of polyethylene wax and paraffin wax.

[0007] In the present invention, one or both of polyethylene wax and paraffin wax are added as viscosity regulators to increase the fluidity of the hot melt adhesive and adjust the solidification speed to quickly achieve a strong bonding effect. At the same time, through appropriate viscosity adjustment, the hot melt adhesive can maintain good bonding performance at different temperatures.

[0008] As a further technical solution, the polyolefin elastomer includes one or two of ethylene-butene copolymer and ethylene-octene copolymer, for example, it can be one or more of POE Exxon 9061, POE Exxon 9071, POE Dow 7467, POE Dow 8480, POE Exxon 8780, and POE Exxon 8380.

[0009] In the present invention, the alkyl methacrylate may be any one or more alkyl methacrylates, preferably octadecyl methacrylate.

[0010] In the present invention, the carboxylic acid may be any compound containing a carboxyl group, for example, it may be one or more of suberic acid, dodecanedioic acid, sebacic acid, and adipic acid.

[0011] As a further technical solution, the carboxylic acid is a carboxylic acid containing a benzene ring.

[0012] The carboxylic acid containing a benzene ring in the present invention can be any carboxylic acid compound containing a benzene ring, for example, it can be one or more of 1,4-benzenedioic acid, p-phenylenedipropionic acid, and terephthalic acid. The inventors have found that when the carboxylic acid is a carboxylic acid containing a benzene ring, the bonding effect of the hot melt adhesive on metal materials and polyolefin materials is better.

[0013] As a further technical solution, the carboxylic acid is a carboxylic acid containing a benzene ring and a monoamide group.

[0014] The carboxylic acid in the present invention is a carboxylic acid containing a benzene ring and a monoamide group, preferably terephthalic acid monoamide. Since the polarity of the carboxyl group is too strong, the polarity and non-polarity of the hot melt adhesive are balanced by introducing a monoamide group with relatively weak polarity, thereby further improving the bonding effect of polar metal materials and non-polar polyolefin materials.

[0015] As a further technical solution, the mass ratio of the polyolefin elastomer, ethylene-vinyl acetate copolymer, compatibilizer, tackifier and antioxidant to the adhesion promoter is 107:10-12.

[0016] The present invention limits the mass of the polyolefin elastomer, ethylene-vinyl acetate copolymer, compatibilizer, tackifier and antioxidant and the mass ratio to the adhesion promoter to 107:10-12, thereby further improving the bonding effect of the hot melt adhesive on metal materials and polyolefin materials.

[0017] As a further technical solution, the mass of 3 times the alkyl methacrylate is ≥ the mass of the carboxylic acid.

[0018] The present invention limits the mass of 3 times the alkyl methacrylate to be greater than or equal to the mass of the carboxylic acid, thereby further improving the bonding effect of the hot melt adhesive on metal materials and polyolefin materials.

[0019] As a further technical solution, the mass ratio of the alkyl methacrylate to the carboxylic acid is 1-3:1.

[0020] The present invention limits the mass ratio of alkyl methacrylate to carboxylic acid to 1-3:1, thereby further improving the bonding effect of the hot melt adhesive on metal materials and polyolefin materials.

[0021] As a further technical solution, the compatibilizer includes maleic anhydride grafted polyolefin resin.

[0022] As a further technical solution, the maleic anhydride grafted polyolefin resin includes one or both of maleic anhydride grafted polyethylene resin and maleic anhydride grafted polypropylene resin.

[0023] The compatibilizer added in the present invention is used for compatibility and uniform dispersion of two base materials, the polyolefin elastomer and the ethylene-vinyl acetate copolymer, thereby improving the bonding strength of the interface between the two phases.

[0024] As a further technical solution, the tackifier includes one or more of petroleum resin, rosin resin, and terpene phenol resin.

[0025] The tackifier in the present invention can be any one or more conventional tackifiers, for example, one or more of petroleum resin, rosin resin, terpene phenol resin. The added tackifier is used to enhance the wettability between the hot melt adhesive and the adherend (metal material, polyolefin material), thereby improving the adhesion of the hot melt adhesive to a certain extent.

[0026] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 1076, antioxidant 164, antioxidant CA, antioxidant DNP, and antioxidant DLTP.

[0027] The antioxidant in the present invention can be any one or more conventional antioxidants, for example, one or more of antioxidant 1010, antioxidant 1076, antioxidant 164, antioxidant CA, antioxidant DNP, and antioxidant DLTP. The use of antioxidants can prevent thermal degradation and oxidation reactions of polymer compounds and enhance the long-term stability of hot melt adhesives.

[0028] The present invention also provides a method for preparing a hot melt adhesive, comprising the following steps: uniformly mixing the components in parts by mass, and then melting and extruding the components to obtain the hot melt adhesive.

[0029] The working principle and beneficial effects of the present invention are: 1. The hot melt adhesive of the present invention is a bonding system based on polyolefin elastomer and ethylene-vinyl acetate copolymer, which is composed of polyolefin elastomer, ethylene-vinyl acetate copolymer, compatibilizer, tackifier, viscosity regulator, antioxidant and adhesion promoter. It can be used for bonding various metal materials such as aluminum, stainless steel, copper and polyvinyl chloride, polyethylene, polypropylene, polystyrene, polytetrafluoroethylene and other polyolefin materials. After bonding, it also has good water boiling resistance, and no bubbling or shedding phenomenon will occur after boiling for 3 hours.

[0030] 2. The adhesion promoter in the present invention includes alkyl methacrylate and carboxylic acid. Since alkyl methacrylate has good affinity for polyolefin materials and carboxylic acid can be adsorbed on the surface of metal materials, the combination of alkyl methacrylate and carboxylic acid improves the bonding effect of hot melt adhesive on metal materials and polyolefin materials. DETAILED DESCRIPTION

[0031] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The parameters of the raw materials in the following examples and comparative examples are as follows: Ethylene-vinyl acetate copolymer was EVA Mitsui Chemicals 150; Maleic anhydride grafted polypropylene is Bynel adhesive resin American DuPont 50E662; The petroleum resin is C9 petroleum resin BT-C90, purchased from Puyang Kairuide Petroleum Resin Co., Ltd.

[0033] Example 1 40 parts of POE Exxon 8780, 25 parts of ethylene-vinyl acetate copolymer, 15 parts of maleic anhydride grafted polypropylene, 25 parts of rosin resin, 20 parts of paraffin, 2 parts of antioxidant CA, 0.5 parts of octadecyl methacrylate, and 4.5 parts of suberic acid were mixed evenly, melted and extruded to obtain a hot melt adhesive.

[0034] Example 2 30 parts of POE Exxon 8380, 15 parts of ethylene-vinyl acetate copolymer, 8 parts of maleic anhydride grafted polypropylene, 15 parts of petroleum resin, 10 parts of polyethylene wax, 0.5 parts of antioxidant 1076, 0.5 parts of octadecyl methacrylate and 4.5 parts of suberic acid were mixed evenly, melt-extruded and obtained into a hot melt adhesive.

[0035] Example 3 The only difference from Example 2 is that suberic acid is replaced by an equal amount of 1,4-benzenedioic acid.

[0036] Example 4 The only difference from Example 2 is that suberic acid is replaced by an equal amount of terephthalic acid monoamide.

[0037] Example 5 The only difference from Example 4 is: 1 part of octadecyl methacrylate and 9 parts of terephthalic acid monoamide.

[0038] Example 6 The only difference from Example 4 is that 1.2 parts of octadecyl methacrylate and 10.8 parts of terephthalic acid monoamide are used.

[0039] Example 7 The only difference from Example 4 is that 1.5 parts of octadecyl methacrylate and 13.5 parts of terephthalic acid monoamide are used.

[0040] Example 8 The only difference from Example 6 is: 3 parts of octadecyl methacrylate and 9 parts of terephthalic acid monoamide.

[0041] Example 9 The only difference from Example 6 is that 6 parts of octadecyl methacrylate and 6 parts of terephthalic acid monoamide are used.

[0042] Example 10 The only difference from Example 6 is: 9 parts of octadecyl methacrylate and 3 parts of terephthalic acid monoamide.

[0043] Embodiment 11 The only difference from Example 6 is that 10.8 parts of octadecyl methacrylate and 1.2 parts of terephthalic acid monoamide are used.

[0044] Comparative Example 1 30 parts of POE Exxon 8380, 15 parts of ethylene-vinyl acetate copolymer, 8 parts of maleic anhydride grafted polypropylene, 15 parts of petroleum resin, 10 parts of polyethylene wax, 0.5 parts of antioxidant 1076, and 5 parts of octadecyl methacrylate were mixed evenly, melt-extruded, and obtained a hot melt adhesive.

[0045] Comparative Example 2 30 parts of POE Exxon 8380, 15 parts of ethylene-vinyl acetate copolymer, 8 parts of maleic anhydride grafted polypropylene, 15 parts of petroleum resin, 10 parts of polyethylene wax, 0.5 parts of antioxidant 1076 and 5 parts of suberic acid were mixed evenly, melt-extruded and obtained a hot melt adhesive.

[0046] Comparative Example 3 30 parts of POE Exxon 8380, 15 parts of ethylene-vinyl acetate copolymer, 8 parts of maleic anhydride grafted polypropylene, 15 parts of petroleum resin, 10 parts of polyethylene wax and 0.5 parts of antioxidant 1076 were mixed evenly, melt-extruded and obtained a hot melt adhesive.

[0047] The hot melt adhesives obtained in Examples 1 to 11 and Comparative Examples 1 to 3 were processed into adhesive films with a thickness of 0.1 mm, and placed between a PE film and an aluminum sheet, and between a PP film and an aluminum sheet, respectively. After hot pressing at 160° C. and 0.5 MPa for 20 seconds, the peel strength was tested with reference to the method in GB / T 2790-1995. The test results are recorded in Table 1.

[0048] Table 1 Bonding strength of hot melt adhesive

[0049] It can be seen from Table 1 that the hot melt adhesive provided by the present invention has high bonding strength when used to bond metal materials and polyolefin materials.

[0050] Compared with Comparative Examples 1 to 3, in Examples 1 to 11, alkyl methacrylate and carboxylic acid are added as adhesion promoters, and the bonding strength of the obtained hot melt adhesive is higher than that of Comparative Examples 1 to 3, indicating that the combination of alkyl methacrylate and carboxylic acid can improve the bonding effect of hot melt adhesive on metal materials and polyolefin materials.

[0051] The bonding strength of the hot melt adhesive obtained in Example 3 is higher than that in Example 2, indicating that the carboxylic acid is a carboxylic acid containing a benzene ring, which can further improve the bonding effect of the hot melt adhesive on metal materials and polyolefin materials.

[0052] The bonding strength of the hot melt adhesive obtained in Example 4 is higher than that in Example 2 and Example 3, indicating that the carboxylic acid is a carboxylic acid containing a benzene ring and a monoamide group, which can further improve the bonding effect of the hot melt adhesive on metal materials and polyolefin materials.

[0053] The bonding strength of the hot melt adhesive obtained in Examples 5 to 6 is higher than that in Examples 4 and 7, indicating that when the mass ratio of the polyolefin elastomer, ethylene-vinyl acetate copolymer, compatibilizer, tackifier and antioxidant to the adhesion promoter is 107:10 to 12, the bonding effect of the hot melt adhesive on metal materials and polyolefin materials can be further improved.

[0054] The bonding strength of the hot melt adhesives obtained in Examples 8 to 11 is higher than that in Example 6, indicating that when the mass of 3 times the alkyl methacrylate is ≥ the mass of the carboxylic acid, the bonding effect of the hot melt adhesive on metal materials and polyolefin materials can be further improved.

[0055] The bonding strength of the hot melt adhesive obtained in Examples 9-10 is higher than that in Examples 8 and 11, indicating that the mass ratio of alkyl methacrylate to carboxylic acid is 1-3:1, which can further improve the bonding effect of the hot melt adhesive on metal materials and polyolefin materials.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hot melt adhesive for bonding metal materials and polyolefin materials, characterized in that: The invention comprises the following components in parts by weight: 30-40 parts of polyolefin elastomer, 15-25 parts of ethylene-vinyl acetate copolymer, 8-15 parts of compatibilizer, 15-25 parts of tackifier, 10-20 parts of viscosity regulator, 0.5-2 parts of antioxidant and 5-15 parts of adhesion promoter, wherein the adhesion promoter comprises alkyl methacrylate and carboxylic acid in a mass ratio of 1:9-9:

1.

2. The hot melt adhesive for bonding metal materials and polyolefin materials according to claim 1, characterized in that: The carboxylic acid is a carboxylic acid containing a benzene ring.

3. The hot melt adhesive for bonding metal materials and polyolefin materials according to claim 2, characterized in that: The carboxylic acid is a carboxylic acid containing a benzene ring and a monoamide group.

4. The hot melt adhesive for bonding metal materials and polyolefin materials according to claim 3, characterized in that: The mass ratio of the polyolefin elastomer, ethylene-vinyl acetate copolymer, compatibilizer, tackifier and antioxidant to the adhesion promoter is 107:10-12.

5. The hot melt adhesive for bonding metal materials and polyolefin materials according to claim 4, characterized in that: 3 times the mass of the alkyl methacrylate ≥ the mass of the carboxylic acid.

6. The hot melt adhesive for bonding metal materials and polyolefin materials according to claim 5, characterized in that: The mass ratio of the alkyl methacrylate to the carboxylic acid is 1-3:

1.

7. The hot melt adhesive for bonding metal materials and polyolefin materials according to claim 1, characterized in that: The compatibilizer includes maleic anhydride grafted polyolefin resin.

8. The hot melt adhesive for bonding metal materials and polyolefin materials according to claim 1, characterized in that: The tackifier includes one or more of petroleum resin, rosin resin, and terpene phenol resin.

9. The hot melt adhesive for bonding metal materials and polyolefin materials according to claim 1, characterized in that: The antioxidant includes one or more of antioxidant 1010, antioxidant 1076, antioxidant 164, antioxidant CA, antioxidant DNP, and antioxidant DLTP.

10. The method for preparing a hot melt adhesive according to any one of claims 1 to 9, characterized in that: The following steps are involved: The components in parts by mass are uniformly mixed and then melted and extruded to obtain a hot melt adhesive.

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