Water-based environment-friendly adhesive film and preparation method thereof

Abstract

The invention discloses a water-based environment-friendly adhesive film and a preparation method thereof. The preparation method sequentially comprises the following steps: S1, preparing a water-based environment-friendly adhesive solution; s2, coating is conducted; s3, drying is conducted; and S4, cooling and cutting. By adopting the water-based acrylate adhesive and reasonably and optimally matching various raw materials, in the preparation process of the water-based environment-friendly glue solution, the generation of chemical reaction is reduced, the emission of pollutants such as waste gas and wastewater is reduced, the environmental pollution is reduced, and meanwhile, the water-based environment-friendly glue solution does not contain organic solvents, is non-toxic and odorless, and is non-combustible and non-explosive; the adhesive has good adhesive property, weather resistance and temperature resistance, also keeps good environmental protection performance, and meets the VOC standard of most vehicle enterprises; a traditional high-temperature and high-pressure forming mode is replaced with a coating and drying curing forming mode, energy consumption in production is reduced, meanwhile, the production efficiency is improved, the production period is shortened, and therefore the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of environmentally friendly adhesive films, in particular to a water-based environmentally friendly adhesive film and a preparation method thereof. Background Art

[0002] With the improvement of environmental protection laws and regulations, the automotive manufacturing industry has higher requirements for materials, so more and more environmentally friendly films will be used.

[0003] Although the existing environmentally friendly films have achieved environmentally friendly effects in terms of their performance and materials, there are still many environmentally unfriendly problems in the preparation process, including but not limited to the following problems: 1. A large amount of waste gas, wastewater and other pollutants generated in the preparation process of the environmentally friendly films will cause pollution to the environment; 2. The high temperature and high pressure molding method used in the preparation process of the environmentally friendly films leads to high energy consumption and high cost. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a water-based environmentally friendly adhesive film and a preparation method thereof.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A method for preparing a water-based environmentally friendly adhesive film comprises performing the following steps in sequence:

[0007] S1. Prepare an environmentally friendly water-based adhesive: mix an aqueous acrylic adhesive, deionized water, a thickener, a wetting agent, a defoaming agent, and a leveling agent in a weight ratio of 100:47:3:1:1:1, and stir the mixture at room temperature to prepare an environmentally friendly water-based adhesive;

[0008] S2, coating: adding the water-based environmentally friendly adhesive prepared in step S1 to a coating machine, and then starting the coating machine to evenly coat the water-based environmentally friendly adhesive on the substrate to form a wet adhesive film;

[0009] S3, drying: placing the substrate coated with the wet adhesive film in step S2 into an oven, and drying and curing the wet adhesive film to obtain a dry adhesive film;

[0010] S4, cooling and cutting: wait for the dry film to cool to room temperature, then cut and package it to obtain the finished water-based environmentally friendly film.

[0011] In the above-mentioned method for preparing a water-based environmentally friendly adhesive film, in step S1, the solid content of the water-based acrylic adhesive is 50-55%, the pH value is 7-9, and the glass transition temperature is -20°C.

[0012] In the above-mentioned method for preparing a water-based environmentally friendly adhesive film, in step S1, the solid content of the water-based acrylic adhesive is 53.5%.

[0013] In the above-mentioned method for preparing a water-based environmentally friendly adhesive film, the water-based environmentally friendly adhesive solution also includes a curing agent.

[0014] In the above-mentioned method for preparing a water-based environmentally friendly adhesive film, in step S1, stirring is performed at a rotation speed of 450 to 550 rpm at room temperature for 25 to 35 minutes to obtain a uniform water-based environmentally friendly adhesive solution.

[0015] In the above-mentioned method for preparing a water-based environmentally friendly adhesive film, in step S2, the scraper gap of the coating machine is adjusted to 0.5-0.7 mm, and the coating speed is 2.5-3.5 m / min.

[0016] In the above-mentioned method for preparing a water-based environmentally friendly adhesive film, step S3 further includes sequentially performing the following sub-steps:

[0017] S301, drying: placing the substrate coated with the wet adhesive film in step S2 into an oven and drying at 75-85° C. for 25-35 min;

[0018] S302, curing: curing the substrate after step S301 at 115-125°C for 25-35 minutes to obtain a dry adhesive film.

[0019] In the above-mentioned method for preparing a water-based environmentally friendly adhesive film, step S3 further includes sequentially performing the following sub-steps:

[0020] S301, drying: placing the substrate coated with the wet adhesive film in step S2 into an oven and drying at 80° C. for 30 min;

[0021] S302, curing: curing the substrate after step S301 at 120°C for 30 minutes to obtain a dry adhesive film.

[0022] In the above-mentioned method for preparing a water-based environmentally friendly adhesive film, the substrate is a non-woven fabric substrate.

[0023] The present application also discloses a water-based environmentally friendly adhesive film, which is prepared by the water-based environmentally friendly adhesive film preparation method as described above.

[0024] The beneficial effects of the present invention are:

[0025] 1. By using water-based acrylic adhesives and rationally optimizing the combination of various raw materials, the chemical reactions are reduced in the process of preparing water-based environmentally friendly adhesives, reducing the emission of pollutants such as waste gas and wastewater, and reducing environmental pollution. At the same time, the water-based environmentally friendly adhesive does not contain organic solvents, is non-toxic and odorless, non-flammable and non-explosive. While having good bonding properties, weather resistance and temperature resistance, it also maintains good environmental performance and meets the VOC standards of most car companies.

[0026] 2. The coating + drying and curing molding method is used to replace the traditional high temperature and high pressure molding method, which reduces energy consumption in production, improves production efficiency, shortens production cycle, and thus reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 The present invention is a process flow chart of a method for preparing a water-based environmentally friendly adhesive film.

[0029] Figure 2 It is a schematic structural diagram of a water-based environmentally friendly adhesive film according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] See also Figure 1 and Figure 2 As shown, the embodiment of the present application provides a method for preparing a water-based environmentally friendly adhesive film, comprising sequentially performing the following steps:

[0032] S1. Prepare an environmentally friendly water-based adhesive: mix an aqueous acrylic adhesive, deionized water, a thickener, a wetting agent, a defoaming agent, and a leveling agent in a weight ratio of 100:47:3:1:1:1, and stir the mixture at room temperature to prepare an environmentally friendly water-based adhesive;

[0033] S2, coating: adding the water-based environmentally friendly adhesive prepared in step S1 to a coating machine, and then starting the coating machine to evenly coat the water-based environmentally friendly adhesive on the substrate 1 to form a wet adhesive film;

[0034] S3, drying: placing the substrate coated with the wet adhesive film in step S2 into an oven, and drying and curing the wet adhesive film to obtain a dry adhesive film;

[0035] S4, cooling and cutting: after the dry adhesive film is cooled to room temperature, it is cut and packaged to obtain a finished water-based environmentally friendly adhesive film 2.

[0036] The embodiment of the present application also provides a water-based environmentally friendly adhesive film, which is prepared using the water-based environmentally friendly adhesive film preparation method as described above.

[0037] By using water-based acrylic adhesives and rationally optimizing the combination of various raw materials, the occurrence of chemical reactions is reduced during the preparation of water-based environmentally friendly adhesives, the emission of pollutants such as waste gas and wastewater is reduced, and environmental pollution is reduced. At the same time, the water-based environmentally friendly adhesive does not contain organic solvents, is non-toxic and odorless, non-flammable and non-explosive. While having good bonding properties, weather resistance and temperature resistance, it also maintains good environmental performance and meets the VOC standards of most car companies.

[0038] The coating + drying and curing molding method is used to replace the traditional high temperature and high pressure molding method, which reduces energy consumption in production, improves production efficiency, shortens production cycle, and thus reduces production costs.

[0039] Furthermore, in step S1, the water-based acrylic adhesive has a solid content of 50-55%, a pH value of 7-9, and a glass transition temperature of -20°C.

[0040] In this embodiment, preferably, the solid content of the water-based acrylic adhesive is 53.5%.

[0041] Specifically, the water-based environmentally friendly adhesive also includes a curing agent.

[0042] Furthermore, in step S1, stirring is performed at room temperature at a rotation speed of 450 to 550 rpm for 25 to 35 minutes to obtain a uniform aqueous environmentally friendly adhesive solution.

[0043] In this embodiment, preferably, the stirring speed is 500 rpm and the time is 30 min. By optimizing and controlling the stirring speed and time, the mixing degree and chemical reaction rate of each raw material during the stirring process are maintained within an appropriate range, thereby further reducing the occurrence of chemical reactions, reducing the emission of pollutants such as waste gas and wastewater, and reducing environmental pollution.

[0044] Furthermore, in step S2, the scraper gap of the coating machine is adjusted to 0.5-0.7 mm, and the coating speed is 2.5-3.5 m / min.

[0045] In this embodiment, preferably, the scraper gap of the coater is adjusted to 0.6 mm, and the coating speed is 3 m / min.

[0046] By adjusting the scraper gap and coating speed, the water-based environmentally friendly adhesive can be evenly applied to the substrate and the thickness of the wet adhesive film can be controlled, which is convenient for subsequent processing and is practical.

[0047] Furthermore, step S3 further includes sequentially executing the following sub-steps:

[0048] S301, drying: placing the substrate coated with the wet adhesive film in step S2 into an oven and drying at 75-85° C. for 25-35 min;

[0049] S302, curing: curing the substrate after step S301 at 115-125°C for 25-35 minutes to obtain a dry adhesive film.

[0050] In this embodiment, preferably, the drying temperature is 80° C., the time is 30 min, and the curing temperature is 120° C., the time is 30 min.

[0051] By sequentially coordinating steps S301 and S302, the wet adhesive film is transformed into a dry adhesive film and solidified and connected to the substrate for forming. There is no need to use a high-temperature and high-pressure forming method, which reduces energy consumption in production, improves production efficiency, shortens the production cycle, and thus reduces production costs.

[0052] Furthermore, the substrate is a non-woven fabric substrate.

[0053] In summary, the water-based environmentally friendly adhesive film prepared by the preparation method of the present invention has high bonding strength, good weather resistance, and strong temperature resistance, which meets the bonding requirements of various materials and improves the product performance and service life.

[0054] By optimizing the selection and mixing of raw materials, the occurrence of chemical reactions is reduced, the emission of pollutants such as waste gas and wastewater is reduced, and environmental pollution is reduced.

[0055] And the coating + drying and curing molding method is used to replace the traditional high temperature and high pressure molding method, which reduces energy consumption in production, while improving production efficiency, shortening the production cycle, and thus reducing production costs.

[0056] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure made using the contents of the present invention's specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing a water-based environmentally friendly film, characterized in that: It includes executing the following steps in sequence: S1. Prepare an environmentally friendly water-based adhesive: mix an aqueous acrylic adhesive, deionized water, a thickener, a wetting agent, a defoaming agent, and a leveling agent in a weight ratio of 100:47:3:1:1:1, and stir the mixture at room temperature to prepare an environmentally friendly water-based adhesive; S2, coating: adding the water-based environmentally friendly adhesive prepared in step S1 to a coating machine, and then starting the coating machine to evenly coat the water-based environmentally friendly adhesive on the substrate to form a wet adhesive film; S3, drying: placing the substrate coated with the wet adhesive film in step S2 into an oven, and drying and curing the wet adhesive film to obtain a dry adhesive film; S4, cooling and cutting: wait for the dry film to cool to room temperature, then cut and package it to obtain the finished water-based environmentally friendly film.

2. The method for preparing a water-based environmentally friendly adhesive film according to claim 1, characterized in that: In step S1, the water-based acrylic adhesive has a solid content of 50-55%, a pH value of 7-9, and a glass transition temperature of -20°C.

3. The method for preparing a water-based environmentally friendly adhesive film according to claim 2, characterized in that: In step S1, the solid content of the water-based acrylic adhesive is 53.5%.

4. A method for preparing a water-based environmentally friendly adhesive film according to any one of claims 1 to 3, characterized in that: The water-based environmentally friendly glue also includes a curing agent.

5. The method for preparing a water-based environmentally friendly adhesive film according to claim 1, characterized in that: In step S1, stirring is performed at room temperature at a rotation speed of 450 to 550 rpm for 25 to 35 minutes to obtain a uniform aqueous environmentally friendly adhesive solution.

6. The method for preparing a water-based environmentally friendly adhesive film according to claim 1, characterized in that: In step S2, the scraper gap of the coating machine is adjusted to 0.5-0.7 mm, and the coating speed is 2.5-3.5 m / min.

7. The method for preparing a water-based environmentally friendly adhesive film according to claim 1, characterized in that: Step S3 also includes sequentially executing the following sub-steps: S301, drying: placing the substrate coated with the wet adhesive film in step S2 into an oven and drying at 75-85° C. for 25-35 min; S302, curing: curing the substrate after step S301 at 115-125°C for 25-35 minutes to obtain a dry adhesive film.

8. The water-based environmentally friendly film according to claim 7, characterized in that: Step S3 also includes sequentially executing the following sub-steps: S301, drying: placing the substrate coated with the wet adhesive film in step S2 into an oven and drying at 80° C. for 30 min; S302, curing: curing the substrate after step S301 at 120°C for 30 minutes to obtain a dry adhesive film.

9. The method for preparing a water-based environmentally friendly adhesive film according to claim 1, characterized in that: The substrate is a non-woven fabric substrate.

10. A water-based environmentally friendly film, characterized in that The water-based environmentally friendly adhesive film is prepared by the method for preparing the water-based environmentally friendly adhesive film as described in any one of claims 1 to 9.

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