CN114395155A - Chemical foaming high-resilience acrylic foam and preparation method thereof - Google Patents
Chemical foaming high-resilience acrylic foam and preparation method thereof Download PDFInfo
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- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
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Abstract
The invention discloses a chemically foamed high-resilience acrylic acid foam which comprises a base material layer, an acrylic acid foam layer and a functional coating, wherein the acrylic acid foam layer is coated on the base material layer, and the functional coating is coated on one side of the acrylic acid foam layer opposite to the base material layer; the acrylic acid foam layer is obtained by drying acrylic acid foam coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of acrylic polymer, 0.05-10 parts of curing agent, 0.5-15 parts of foaming agent, 0.05-8 parts of filler and 20-100 parts of organic solvent; the functional coating is obtained by drying a coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of acrylic polymer, 0.03-5 parts of curing agent and 20-60 parts of organic solvent. The chemically foamed high-resilience acrylic foam has good buffering performance and high impact absorption performance, the functional coating can improve the roughness and the glossiness of the surface of the foam, the coating has weak viscosity, and the coating can temporarily fix a smooth surface and can be repeatedly attached.
Description
Technical Field
The invention belongs to the technical field of acrylic acid foam, and particularly relates to chemical foaming high-resilience acrylic acid foam and a preparation method thereof.
Background
With the advent of the mobile internet era, smart wearable devices have become the paradigm for combining software and hardware of the mobile internet. Meanwhile, with continuous iterative updating of big data, cloud computing and the Internet of things technology, the development space of the intelligent wearable device is greatly widened. The wearable product form that is main on the existing market is different, mainly includes intelligent glasses, intelligent wrist-watch, intelligent bracelet, idea control, healthy wearing, body sense control, article are tracked etc.. Taken together, they primarily contain the watch class, shoes class, Glass class, other non-mainstream product types such as smart clothing bags, crutches, accessories, and the like. As electronic products which are convenient for people to work and live, along with the development of science and technology, the electronic products are more and more diversified, the application is more and more extensive, the thickness of a buffer material in equipment in the field of consumer electronics is required to be thinned, the buffer performance is required to be improved, and particularly, a sealing element is used between the edge of internal equipment and a shell, so that a material with good buffer effect and good shading effect is required. However, the electronic product is difficult to avoid colliding and falling in the using process, which creates great challenges for the use safety performance and the service life of the electronic product.
Disclosure of Invention
The invention aims to provide a chemically foamed high-resilience acrylic acid foam which has good buffering performance and high impact absorption performance, a functional coating can improve the roughness and glossiness of the surface of the foam, has weak viscosity, and can temporarily fix a smooth surface and repeatedly perform laminating operation.
In order to achieve the purpose, the invention adopts the technical scheme that: the chemically foamed high-resilience acrylic foam comprises a base material layer, an acrylic foam layer and a functional coating, wherein the acrylic foam layer is coated on the base material layer, and the functional coating is coated on one side of the acrylic foam layer opposite to the base material layer;
the acrylic acid foam layer is obtained by drying acrylic acid foam coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of acrylic polymer, 0.05-10 parts of curing agent, 0.5-15 parts of foaming agent, 0.05-8 parts of filler and 20-100 parts of organic solvent;
the functional coating is obtained by drying a coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of acrylic polymer, 0.03-5 parts of curing agent and 20-60 parts of organic solvent.
The technical scheme of further improvement in the technical scheme is as follows:
1. in the above scheme, the acrylic polymer is one or more than two of polyester resin, polyurethane resin, epoxy resin, silicone resin, and natural rubber blended or graft-modified acrylic polymer. The main body resin is made of a high-elasticity polymer material, and compared with a common polymer material, the high-elasticity polymer material has high buffering new energy and shock absorption.
2. In the above scheme, the curing agent is one or a mixture of at least two of an epoxy curing agent, an isocyanate curing agent, an imidazole curing agent, a hydrazide curing agent and an amine curing agent. The resin curing is carried out by adding a curing (crosslinking) agent to a thermosetting resin through chemical reactions such as condensation, ring closure, addition or catalysis to cause irreversible change of the thermosetting resin. Provides the crosslinking degree of the material, provides temperature resistance, heat resistance and water resistance, and is not easy to decompose at high temperature.
3. In the above scheme, the chemical foaming agent is an organic chemical foaming agent azo compound, a sulfonyl hydrazide compound, a nitroso compound, a triazole compound, an azide compound, an inorganic chemical foaming agent: sodium bicarbonate, ammonium carbonate, ammonium hydrogen nitrate, sodium borohydride and bicarbonate compound or a mixture of at least two of the compounds. The blowing agent can be uniformly dispersed in the polymer, and rapidly decomposed at the processing temperature to generate a large amount of gas, thereby foaming the polymer. The inside of the material after foaming molding is provided with a porous structure, and the impact kinetic energy is absorbed by utilizing the internal porous structure, so that the buffering effect is achieved.
4. In the scheme, the inorganic filler is one or a mixture of at least two of titanium dioxide, mica powder, talcum powder, aluminum oxide, silicon dioxide, hollow glass beads, calcium carbonate, barium sulfate and diamond powder. It has hiding power, tinting strength, is relatively light stable, and is commonly used in formulating paints, inks, and pigmented plastics and rubbers, and thus may also be referred to as a colorant.
5. In the above embodiment, the organic solvent is preferably at least one selected from the group consisting of an ester organic solvent, a ketone organic solvent, an ether organic solvent, an alcohol organic solvent, an aromatic hydrocarbon organic solvent, an aliphatic hydrocarbon organic solvent, and dimethyl sulfoxide, and more preferably an ester organic solvent or a ketone organic solvent; wherein the ester organic solvent comprises one or more of methyl acetate, ethyl acetate, propyl acetate and butyl acetate; the ketone organic solvent comprises at least one of acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone; the ether organic solvent comprises at least one of cyclic ethers such as tetrahydrofuran, tetrahydropyran and dioxane; the alcohol organic solvent comprises at least one of methanol, ethanol, tert-butyl alcohol, isopropanol and ethylene glycol; the aromatic hydrocarbon organic solvent comprises at least one of benzene, toluene, xylene, naphthalene and solvent naphtha; the aliphatic hydrocarbon organic solvent comprises one or a mixture of at least two of hexane, cyclohexane, octane, nonane, decane, undecane, dodecane and mineral essential oil.
5. In the above scheme, the substrate layer is one of a single-layer film, a composite polyester film, a coating polyester film or a polymer co-extruded resin film, and more preferably, the substrate is one or more selected from polyethylene terephthalate, polyimide, polyamide, an aluminum-plated film, polypropylene and polytetrafluoroethylene.
The other technical scheme of the invention is as follows: a preparation method of chemically foamed high-resilience acrylic foam comprises the following steps:
s1, sequentially adding the acrylic polymer, the foaming agent, the inorganic filler and the organic solvent into the reaction kettle according to the proportion, and mixing, dispersing and stirring at a high speed for 30-60 min;
s2, adding a curing agent, mixing at high speed, dispersing and stirring for 30-60min, standing and defoaming for a period of time to obtain an acrylic acid foam mixed solution;
s3, coating the acrylic acid foam mixed solution on the substrate layer, and drying and curing the acrylic acid foam mixed solution in an oven to obtain a foam layer;
s4, adding an acrylic polymer, a curing agent and an organic solvent into a reaction kettle, and mixing, dispersing and stirring at a high speed for 30-60min to obtain a functional coating mixed solution;
and S5, coating the mixed liquid of the functional coating on the S3 acrylic acid foam layer, and drying and curing in an oven to obtain the functional coating.
The technical scheme of further improvement in the technical scheme is as follows:
1. in the above scheme, the oven temperature in S3 is as follows: the temperature of the first section of drying oven is 60-70 ℃, the temperature of the second section of drying oven is 60-70 ℃, the temperature of the third section of drying oven is 70-80 ℃, the temperature of the fourth section of drying oven is 70-80 ℃, the temperature of the fifth section of drying oven is 80-90 ℃, the temperature of the sixth section of drying oven is 90-100 ℃, the temperature of the seventh section of drying oven is 100-110 ℃, and the drying time is 5 min; the oven temperature in S5 was as follows: the temperature of the first section of drying oven is 60-70 ℃, the temperature of the second section of drying oven is 70-80 ℃, the temperature of the third section of drying oven is 80-90 ℃, the temperature of the fourth section of drying oven is 90-100 ℃, the temperature of the fifth section of drying oven is 140-150 ℃, the temperature of the sixth section of drying oven is 140-150 ℃, the temperature of the seventh section of drying oven is 100-110 ℃, and the drying time is 4 min.
2. In the scheme, the coating thickness of the acrylic acid foam mixed liquid in the S3 is 50-200 mu m.
3. In the scheme, the coating thickness of the functional coating mixed solution in the S5 is 5-20 μm.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
compared with the common high polymer material, the main resin material selected by the invention has higher buffering new energy and shock absorption. In order to realize the buffering performance of the material, the material is often required to have a porous structure inside, the impact kinetic energy is absorbed by utilizing the porous structure inside, so that the buffering effect is achieved, holes are generated through the foaming agent, and the prepared foam material usually forms a plurality of foam holes with different sizes, and has smaller compression residual deformation, higher energy absorption and excellent buffering performance. As a material with light weight, good resilience and designable thickness, the material has great application advantages in the aspects of buffering external force borne by an electronic product in the falling and collision processes, reducing damage of the electronic product and prolonging the service life of the electronic product, and is widely applied to a plurality of electronic products at present.
Detailed Description
In the description of this patent, it is noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships and are used merely to facilitate the description of the invention and to simplify the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The meaning of the above terms in this patent may be specifically understood by those of ordinary skill in the art.
The invention is further described below with reference to the following examples:
example 1: the chemically foamed high-resilience acrylic foam comprises a base material layer, an acrylic foam layer and a functional coating, wherein the acrylic foam layer is coated on the base material layer, and the functional coating is coated on one side of the acrylic foam layer opposite to the base material layer;
the acrylic acid foam layer is obtained by drying acrylic acid foam coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of acrylic polymer, 1 part of epoxy curing agent, 6 parts of azodiisobutyronitrile, 3 parts of titanium dioxide and 40 parts of ethyl acetate;
the functional coating is obtained by drying a coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of acrylic polymer, 0.1 part of epoxy curing agent and 50 parts of ethyl acetate;
the preparation method of the foam material comprises the following steps:
s1, sequentially adding the acrylic polymer, the foaming agent, the inorganic filler and the organic solvent into the reaction kettle according to the proportion, and mixing, dispersing and stirring at a high speed for 60 min;
s2, adding a curing agent, mixing at high speed, dispersing and stirring for 40min, standing and defoaming for a period of time to obtain an acrylic acid foam mixed solution;
and S3, coating the acrylic acid foam mixed solution obtained in the step S2 on a polyethylene terephthalate film serving as the base material. The oven temperature was as follows: the temperature of the first section of drying oven is 60 ℃, the temperature of the second section of drying oven is 60 ℃, the temperature of the third section of drying oven is 70 ℃, the temperature of the fourth section of drying oven is 70 ℃, the temperature of the fifth section of drying oven is 80 ℃, the temperature of the sixth section of drying oven is 90 ℃, the temperature of the seventh section of drying oven is 100 ℃, and the drying time is 5 min. Drying and curing to obtain a foam layer with the thickness of 100 um;
and S4, coating the functional coating mixed solution on the S3 foam layer, and drying and curing in an oven to obtain the functional coating with the thickness of 10 um. The oven temperature in S4 was as follows: the temperature of the first section of oven is 60 ℃, the temperature of the second section of oven is 70 ℃, the temperature of the third section of oven is 90 ℃, the temperature of the fourth section of oven is 100 ℃, the temperature of the fifth section of oven is 150 ℃, the temperature of the sixth section of oven is 150 ℃, the temperature of the seventh section of oven is 110 ℃, and the drying time is 4 min.
Example 2: the chemically foamed high-resilience acrylic foam comprises a base material layer, an acrylic foam layer and a functional coating, wherein the acrylic foam layer is coated on the base material layer, and the functional coating is coated on one side of the acrylic foam layer opposite to the base material layer;
the acrylic acid foam layer is obtained by drying acrylic acid foam coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of polyester modified acrylic polymer, 0.5 part of isocyanate curing agent, 10 parts of nitroso compound, 3 parts of calcium carbonate and 60 parts of butyl acetate;
the functional coating is obtained by drying a coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of polyester modified acrylic polymer, 0.2 part of isocyanate curing agent and 30 parts of butyl acetate;
the preparation method of the foam material comprises the following steps:
s1, sequentially adding the acrylic polymer, the foaming agent, the inorganic filler and the organic solvent into the reaction kettle according to the proportion, and mixing, dispersing and stirring at a high speed for 60 min;
s2, adding a curing agent, mixing at high speed, dispersing and stirring for 40min, standing and defoaming for a period of time to obtain an acrylic acid foam mixed solution;
and S3, coating the acrylic acid foam mixed solution obtained in the step S2 on a polyimide film serving as the base material. The oven temperature was as follows: the temperature of the first section of drying oven is 70 ℃, the temperature of the second section of drying oven is 60 ℃, the temperature of the third section of drying oven is 80 ℃, the temperature of the fourth section of drying oven is 80 ℃, the temperature of the fifth section of drying oven is 80 ℃, the temperature of the sixth section of drying oven is 90 ℃, the temperature of the seventh section of drying oven is 110 ℃, and the drying time is 5 min. Drying and curing to obtain a foam layer with the thickness of 100 um;
and S4, coating the functional coating mixed solution on the S3 foam layer, and drying and curing in an oven to obtain the functional coating with the thickness of 10 um. The oven temperature in S4 was as follows: the temperature of the first section of drying oven is 70 ℃, the temperature of the second section of drying oven is 80 ℃, the temperature of the third section of drying oven is 90 ℃, the temperature of the fourth section of drying oven is 90 ℃, the temperature of the fifth section of drying oven is 140 ℃, the temperature of the sixth section of drying oven is 140 ℃, the temperature of the seventh section of drying oven is 10 ℃, and the drying time is 4 min.
Example 3:
the chemically foamed high-resilience acrylic foam comprises a base material layer, an acrylic foam layer and a functional coating, wherein the acrylic foam layer is coated on the base material layer, and the functional coating is coated on one side of the acrylic foam layer opposite to the base material layer;
the acrylic acid foam layer is obtained by drying acrylic acid foam coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of epoxy modified acrylic polymer, 1.5 parts of imidazole curing agent, 4 parts of azide compound, 2 parts of aluminum oxide and 80 parts of methyl ethyl ketone;
the functional coating is obtained by drying a coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of epoxy modified acrylic polymer, 1.2 parts of imidazole curing agent and 60 parts of methyl ethyl ketone;
the preparation method of the foam material comprises the following steps:
s1, sequentially adding the acrylic polymer, the foaming agent, the inorganic filler and the organic solvent into the reaction kettle according to the proportion, and mixing, dispersing and stirring at a high speed for 60 min;
s2, adding a curing agent, mixing at high speed, dispersing and stirring for 40min, standing and defoaming for a period of time to obtain an acrylic acid foam mixed solution;
and S3, coating the acrylic acid foam mixed solution obtained in the step S2 on a polytetrafluoroethylene film serving as the base material. The oven temperature was as follows: the temperature of the first section of oven is 70 ℃, the temperature of the second section of oven is 70 ℃, the temperature of the third section of oven is 75 ℃, the temperature of the fourth section of oven is 75 ℃, the temperature of the fifth section of oven is 85 ℃, the temperature of the sixth section of oven is 90 ℃, the temperature of the seventh section of oven is 110 ℃, and the drying time is 5 min. Drying and curing to obtain a foam layer with the thickness of 100 um;
and S4, coating the functional coating mixed solution on the S3 foam layer, and drying and curing in an oven to obtain the functional coating with the thickness of 10 um. The oven temperature in S4 was as follows: the temperature of the first section of oven is 65 ℃, the temperature of the second section of oven is 75 ℃, the temperature of the third section of oven is 80 ℃, the temperature of the fourth section of oven is 95 ℃, the temperature of the fifth section of oven is 140 ℃, the temperature of the sixth section of oven is 145 ℃, the temperature of the seventh section of oven is 100 ℃, and the drying time is 4 min.
Example 4:
the chemically foamed high-resilience acrylic foam comprises a base material layer, an acrylic foam layer and a functional coating, wherein the acrylic foam layer is coated on the base material layer, and the functional coating is coated on one side of the acrylic foam layer opposite to the base material layer;
the acrylic acid foam layer is obtained by drying acrylic acid foam coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of organic silicon resin modified acrylic polymer, 0.4 part of epoxy curing agent, 8 parts of sulfonyl hydrazine, 5 parts of talcum powder and 40 parts of butyl acetate;
the functional coating is obtained by drying a coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of organic silicon resin modified acrylic polymer, 1 part of epoxy curing agent and 40 parts of organic solvent;
the preparation method of the foam material comprises the following steps:
s1, sequentially adding the acrylic polymer, the foaming agent, the inorganic filler and the organic solvent into the reaction kettle according to the proportion, and mixing, dispersing and stirring at a high speed for 360 min;
s2, adding a curing agent, mixing at high speed, dispersing and stirring for 40min, standing and defoaming for a period of time to obtain an acrylic acid foam mixed solution;
and S3, coating the acrylic acid foam mixed solution obtained in the step S2 on a polyethylene terephthalate film serving as the base material. The oven temperature was as follows: the temperature of the first section of drying oven is 60 ℃, the temperature of the second section of drying oven is 65 ℃, the temperature of the third section of drying oven is 75 ℃, the temperature of the fourth section of drying oven is 75 ℃, the temperature of the fifth section of drying oven is 90 ℃, the temperature of the sixth section of drying oven is 95 ℃, the temperature of the seventh section of drying oven is 105 ℃, and the drying time is 5 min. Drying and curing to obtain a foam layer with the thickness of 100 um;
and S4, coating the functional coating mixed solution on the S3 foam layer, and drying and curing in an oven to obtain the functional coating with the thickness of 10 um. The oven temperature in S4 was as follows: the temperature of the first section of oven is 65 ℃, the temperature of the second section of oven is 75 ℃, the temperature of the third section of oven is 85 ℃, the temperature of the fourth section of oven is 95 ℃, the temperature of the fifth section of oven is 150 ℃, the temperature of the sixth section of oven is 150 ℃, the temperature of the seventh section of oven is 105 ℃, and the drying time is 4 min.
Comparative example 1:
the chemically foamed high-resilience acrylic foam comprises a base material layer, an acrylic foam layer and a functional coating, wherein the acrylic foam layer is coated on the base material layer, and the functional coating is coated on one side of the acrylic foam layer opposite to the base material layer;
the acrylic acid foam layer is obtained by drying acrylic acid foam coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of acrylic polymer, 1 part of epoxy curing agent, 3 parts of titanium dioxide and 40 parts of ethyl acetate;
the functional coating is obtained by drying a coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of acrylic polymer, 0.1 part of epoxy curing agent and 50 parts of ethyl acetate.
The preparation method of the foam material comprises the following steps:
s1, sequentially adding the acrylic polymer, the foaming agent, the inorganic filler and the organic solvent into the reaction kettle according to the proportion, and mixing, dispersing and stirring at a high speed for 60 min;
s2, adding a curing agent, mixing at high speed, dispersing and stirring for 40min, standing and defoaming for a period of time to obtain an acrylic acid foam mixed solution;
and S3, coating the acrylic acid foam mixed solution obtained in the step S2 on a polyethylene terephthalate film serving as the base material. The oven temperature was as follows: the temperature of the first section of drying oven is 60 ℃, the temperature of the second section of drying oven is 60 ℃, the temperature of the third section of drying oven is 70 ℃, the temperature of the fourth section of drying oven is 80 ℃, the temperature of the fifth section of drying oven is 90 ℃, the temperature of the sixth section of drying oven is 90 ℃, the temperature of the seventh section of drying oven is 110 ℃, and the drying time is 5 min. Drying and curing to obtain a foam layer with the thickness of 100 um;
and S4, coating the functional coating mixed solution on the S3 foam layer, and drying and curing in an oven to obtain the functional coating with the thickness of 10 um. The oven temperature in S4 was as follows: the temperature of the first section of oven is 65 ℃, the temperature of the second section of oven is 75 ℃, the temperature of the third section of oven is 85 ℃, the temperature of the fourth section of oven is 95 ℃, the temperature of the fifth section of oven is 145 ℃, the temperature of the sixth section of oven is 145 ℃, the temperature of the seventh section of oven is 105 ℃, and the drying time is 4 min.
Comparative example 2:
the chemically foamed high-resilience acrylic acid foam comprises a base material layer and an acrylic acid foam layer, wherein the acrylic acid foam layer is coated on the base material layer;
the acrylic acid foam layer is obtained by drying acrylic acid foam coating liquid, and the coating liquid consists of the following components in parts by weight:
100 parts of polyester modified acrylic polymer, 0.5 part of isocyanate curing agent, 10 parts of nitroso compound, 3 parts of calcium carbonate and 60 parts of butyl acetate;
the preparation method of the foam material comprises the following steps:
s1, sequentially adding the acrylic polymer, the foaming agent, the inorganic filler and the organic solvent into the reaction kettle according to the proportion, and mixing, dispersing and stirring at a high speed for 60 min;
s2, adding a curing agent, mixing at high speed, dispersing and stirring for 40min, standing and defoaming for a period of time to obtain an acrylic acid foam mixed solution;
and S3, coating the acrylic acid foam mixed solution obtained in the step S2 on a polyimide film serving as the base material. The oven temperature was as follows: the temperature of the first section of drying oven is 70 ℃, the temperature of the second section of drying oven is 70 ℃, the temperature of the third section of drying oven is 80 ℃, the temperature of the fourth section of drying oven is 80 ℃, the temperature of the fifth section of drying oven is 90 ℃, the temperature of the sixth section of drying oven is 100 ℃, the temperature of the seventh section of drying oven is 110 ℃, and the drying time is 5 min. Drying and curing to obtain a foam layer with the thickness of 100 um.
Comparative example 3:
the chemically foamed high-resilience acrylic foam comprises a base material layer, an acrylic foam layer and a functional coating, wherein the acrylic foam layer is coated on the base material layer, and the functional coating is coated on one side of the acrylic foam layer opposite to the base material layer;
the acrylic acid foam layer is obtained by drying acrylic acid foam coating liquid, and the coating liquid consists of the following components in parts by weight:
100 parts of epoxy modified acrylic polymer, 1.5 parts of imidazole curing agent, 30 parts of azide compound, 2 parts of aluminum oxide and 80 parts of methyl ethyl ketone;
the functional coating is obtained by drying a coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of epoxy modified acrylic polymer, 1.2 parts of imidazole curing agent and 60 parts of methyl ethyl ketone;
the preparation method of the foam material comprises the following steps:
s1, sequentially adding the acrylic polymer, the foaming agent, the inorganic filler and the organic solvent into the reaction kettle according to the proportion, and mixing, dispersing and stirring at a high speed for 360 min;
s2, adding a curing agent, mixing at high speed, dispersing and stirring for 40min, standing and defoaming for a period of time to obtain an acrylic acid foam mixed solution;
and S3, coating the acrylic acid foam mixed solution obtained in the step S2 on a polytetrafluoroethylene film serving as the base material. The oven temperature was as follows: the temperature of the first section of drying oven is 60 ℃, the temperature of the second section of drying oven is 60 ℃, the temperature of the third section of drying oven is 70 ℃, the temperature of the fourth section of drying oven is 70 ℃, the temperature of the fifth section of drying oven is 90 ℃, the temperature of the sixth section of drying oven is 90 ℃, the temperature of the seventh section of drying oven is 110 ℃, and the drying time is 5 min. Drying and curing to obtain a foam layer with the thickness of 100 um;
and S4, coating the functional coating mixed solution on the S3 foam layer, and drying and curing in an oven to obtain the functional coating with the thickness of 10 um. The oven temperature in S4 was as follows: the temperature of the first section of drying oven is 70 ℃, the temperature of the second section of drying oven is 70 ℃, the temperature of the third section of drying oven is 80 ℃, the temperature of the fourth section of drying oven is 90 ℃, the temperature of the fifth section of drying oven is 140 ℃, the temperature of the sixth section of drying oven is 140 ℃, the temperature of the seventh section of drying oven is 100 ℃, and the drying time is 4 min.
Comparative example 4:
the chemically foamed high-resilience acrylic foam comprises a base material layer, an acrylic foam layer and a functional coating, wherein the acrylic foam layer is coated on the base material layer, and the functional coating is coated on one side of the acrylic foam layer opposite to the base material layer;
the acrylic acid foam layer is obtained by drying acrylic acid foam coating liquid, and the coating liquid consists of the following components in parts by weight:
100 parts of epoxy resin polymer, 8 parts of sulfonyl hydrazide, 5 parts of talcum powder and 40 parts of butyl acetate;
the functional coating is obtained by drying a coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of epoxy resin polymer and 40 parts of organic solvent.
The preparation method of the foam material comprises the following steps:
s1, sequentially adding the acrylic polymer, the foaming agent, the inorganic filler and the organic solvent into the reaction kettle according to the proportion, and mixing, dispersing and stirring at a high speed for 60 min;
s2, adding a curing agent, mixing at high speed, dispersing and stirring for 40min, standing and defoaming for a period of time to obtain an acrylic acid foam mixed solution;
and S3, coating the acrylic acid foam mixed solution obtained in the step S2 on a polyethylene terephthalate film serving as the base material. The oven temperature was as follows: the temperature of the first section of drying oven is 70 ℃, the temperature of the second section of drying oven is 65 ℃, the temperature of the third section of drying oven is 75 ℃, the temperature of the fourth section of drying oven is 80 ℃, the temperature of the fifth section of drying oven is 90 ℃, the temperature of the sixth section of drying oven is 90 ℃, the temperature of the seventh section of drying oven is 110 ℃, and the drying time is 5 min. Drying and curing to obtain a foam layer with the thickness of 100 um;
and S4, coating the functional coating mixed solution on the S3 foam layer, and drying and curing in an oven to obtain the functional coating with the thickness of 10 um. The oven temperature in S4 was as follows: the temperature of the first section of drying oven is 70 ℃, the temperature of the second section of drying oven is 80 ℃, the temperature of the third section of drying oven is 90 ℃, the temperature of the fourth section of drying oven is 100 ℃, the temperature of the fifth section of drying oven is 140 ℃, the temperature of the sixth section of drying oven is 140 ℃, the temperature of the seventh section of drying oven is 100 ℃, and the drying time is 4 min.
The foam tapes prepared in the above examples 1 to 4 and comparative examples 1 to 4 were subjected to the performance test, which specifically includes the following steps:
1. test method
1.1 thickness measurement
(1) When sampling from the film roll, at least the outermost three circles of the film are removed;
(2) placing the well-taken sample in a standard test environment, and if the temperature balance requirement is only met, placing the sample for at least 3H; if the temperature and humidity balance is required, at least 24H is placed.
(3) The sample is placed between the upper head plane and the lower head plane of the measuring head of the thickness gauge, the adhesive tape is upward, the upper measuring head is slowly lowered during the test, and finally the upper measuring head is covered on the surface of the adhesive tape. Within 1 second after lowering the upper measuring head, the reading of the thickness gauge micrometer is recorded, in mm, to the nearest 0.001 mm.
(4) Measuring 9 points on each single sheet, recording data and calculating an average value; wherein the distance between every 2 points is not less than 50 mm.
1.2 Density test
(1) When sampling from the film roll, at least the outermost three circles of the film are removed;
(2) the samples were placed in a standard test environment for at least 24H.
(3) The test specimens were cut at room temperature to 10cm x 10cm size samples, the weight of the monomer foam was measured as m, and the thickness was measured as h under the same test conditions as above.
(4) Density calculation formula:
ρ＝m/h*100
1.3 tensile Strength and elongation at Break test:
(1) taking a roll-shaped or sheet-shaped sample, cutting the product into 3-5 strips with the size of 10mm multiplied by 150mm, and standing for more than 2H under the test condition.
(2) Equipment: an Shimadzu universal mechanical tension tester. And clamping one end of the sample on a clamp at the lower end of the tensile machine by using a universal tensile machine, stretching at the speed of 500mm/min, and testing the mechanical property.
(3) And recording test data, and taking an average value.
1.4 compressive Strength test
(1) Taking a roll-shaped or sheet-shaped sample, cutting the product into strips with the size of 50mm multiplied by 200mm, and standing for more than 2H under the test condition;
(2) superposing the samples layer by layer to prepare samples with the size of 25mm by 10mm, and standing for 24 hours at constant temperature in a laboratory after the completion;
(3) and (3) testing the sample by using a universal mechanical press, wherein the compression speed is 5mm/min, and performing compression test on the sample.
(4) The compression strength data values corresponding to 25% and 50% compression ratios, respectively, are taken.
1.5 falling ball impact test
(1) Taking a roll-shaped or sheet-shaped sample, cutting the product into strips with the size of 100mm multiplied by 100mm, and standing for more than 2H under the test condition;
(2) mobile phone cover glass, sample specification: 60mm 120mm 0.7mm, adhering acrylic foam material;
(3) the weight of the stainless steel ball is 55g, the diameter of the stainless steel ball is 25mm, the impact test is carried out on the mobile phone glass cover plate attached to the foam at the height of 500mm, and whether a sample is intact is observed.
The test method of the 1.660-degree gloss meter refers to the national standard GB 9754.
(1) When sampling from the film roll, at least the outermost three turns of the film are removed
(2) The samples were placed in a standard test environment for at least 24H.
(3) The instrument is started by pressing a key on the instrument. And (5) calibrating the instrument after starting up.
(4) When a 60-degree gloss meter is placed on the surface of the material to be measured, the gloss value of the material at the position can be immediately displayed on a screen of the meter.
(5) If the evenness of the glossiness of the material at different positions is to be evaluated, when a 60-degree glossiness instrument is used for testing each position, a key on the instrument is pressed, test data is recorded, and when one datum is recorded, the instrument automatically counts the maximum value, the minimum value, the average value and the mean square difference value in the measured data.
2. Testing results;
TABLE 1
As can be seen from the data in Table 1, the density of the chemically foamed high-resilience acrylic foam can be adjusted, the main resin is the acrylic polymer which is blended or grafted and modified, and the polymer material with high elasticity is adopted. By utilizing this characteristic, the buffer material is widely used around liquid crystals.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The utility model provides a chemical foaming high resilience acrylic acid bubble is cotton which characterized in that: the acrylic acid foam layer is coated on the substrate layer, and the functional coating is coated on one side of the acrylic acid foam layer opposite to the substrate layer;
the acrylic acid foam layer is obtained by drying acrylic acid foam coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of acrylic polymer, 0.05-10 parts of curing agent, 0.5-15 parts of foaming agent, 0.05-8 parts of filler and 20-100 parts of organic solvent;
the functional coating is obtained by drying a coating liquid, and the coating liquid consists of the following components in parts by weight: 100 parts of acrylic polymer, 0.03-5 parts of curing agent and 20-60 parts of organic solvent.
2. The chemically foamed high resilience acrylic foam according to claim 1, wherein: the acrylic polymer is one or more than two of polyester resin, polyurethane resin, epoxy resin, organic silicon resin and natural rubber blended or graft modified acrylic polymer.
3. The chemically foamed high resilience acrylic foam according to claim 1, wherein: the curing agent is one or a mixture of at least two of epoxy curing agent, isocyanate curing agent, imidazole curing agent, hydrazide curing agent and amine curing agent.
4. The chemically foamed high resilience acrylic foam according to claim 1, wherein: the chemical foaming agent is an organic chemical foaming agent azo compound, a sulfonyl hydrazine compound, a nitroso compound, a triazole compound, an azide compound and an inorganic chemical foaming agent: sodium bicarbonate, ammonium carbonate, ammonium hydrogen nitrate, sodium borohydride and bicarbonate compound or a mixture of at least two of the compounds.
5. The chemically foamed high resilience acrylic foam according to claim 1, wherein: the inorganic filler is one or a mixture of at least two of titanium dioxide, mica powder, talcum powder, aluminum oxide, silicon dioxide, hollow glass beads, calcium carbonate, barium sulfate and diamond powder.
6. The chemically foamed high resilience acrylic foam according to claim 1, wherein: the organic solvent is preferably at least one selected from the group consisting of an ester organic solvent, a ketone organic solvent, an ether organic solvent, an alcohol organic solvent, an aromatic hydrocarbon organic solvent, an aliphatic hydrocarbon organic solvent, and dimethyl sulfoxide, and more preferably an ester organic solvent or a ketone organic solvent; wherein the ester organic solvent comprises one or more of methyl acetate, ethyl acetate, propyl acetate and butyl acetate; the ketone organic solvent comprises at least one of acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone; the ether organic solvent comprises at least one of cyclic ethers such as tetrahydrofuran, tetrahydropyran and dioxane; the alcohol organic solvent comprises at least one of methanol, ethanol, tert-butyl alcohol, isopropanol and ethylene glycol; the aromatic hydrocarbon organic solvent comprises at least one of benzene, toluene, xylene, naphthalene and solvent naphtha; the aliphatic hydrocarbon organic solvent comprises one or a mixture of at least two of hexane, cyclohexane, octane, nonane, decane, undecane, dodecane and mineral essential oil.
7. A preparation method of the chemically foamed high resilience acrylic foam of any one of claims 1 to 6, which is characterized by comprising the following steps: the method comprises the following steps:
s1, sequentially adding the acrylic polymer, the foaming agent, the inorganic filler and the organic solvent into the reaction kettle according to the proportion, and mixing, dispersing and stirring at a high speed for 30-60 min;
s2, adding a curing agent, mixing at high speed, dispersing and stirring for 30-60min, standing and defoaming for a period of time to obtain an acrylic acid foam mixed solution;
s3, coating the acrylic acid foam mixed solution on the substrate layer, and drying and curing the acrylic acid foam mixed solution in an oven to obtain a foam layer;
s4, adding an acrylic polymer, a curing agent and an organic solvent into a reaction kettle, and mixing, dispersing and stirring at a high speed for 30-60min to obtain a functional coating mixed solution;
and S5, coating the mixed liquid of the functional coating on the S3 acrylic acid foam layer, and drying and curing in an oven to obtain the functional coating.
8. The preparation method of the chemically foamed high resilience acrylic foam according to claim 7, wherein: the oven temperature in S3 was as follows: the temperature of the first section of drying oven is 60-70 ℃, the temperature of the second section of drying oven is 60-70 ℃, the temperature of the third section of drying oven is 70-80 ℃, the temperature of the fourth section of drying oven is 70-80 ℃, the temperature of the fifth section of drying oven is 80-90 ℃, the temperature of the sixth section of drying oven is 90-100 ℃, the temperature of the seventh section of drying oven is 100-110 ℃, and the drying time is 5 min; the oven temperature in S5 was as follows: the temperature of the first section of drying oven is 60-70 ℃, the temperature of the second section of drying oven is 70-80 ℃, the temperature of the third section of drying oven is 80-90 ℃, the temperature of the fourth section of drying oven is 90-100 ℃, the temperature of the fifth section of drying oven is 140-150 ℃, the temperature of the sixth section of drying oven is 140-150 ℃, the temperature of the seventh section of drying oven is 100-110 ℃, and the drying time is 4 min.
9. The preparation method of the chemically foamed high resilience acrylic foam according to claim 7, wherein: the coating thickness of the acrylic acid foam mixed liquid in the S3 is 50-200 mu m.
10. The preparation method of the chemically foamed high resilience acrylic foam according to claim 7, wherein: and the coating thickness of the functional coating mixed liquid in the S5 is 5-20 μm.
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