CN114773755A - Acrylic foam and preparation method thereof - Google Patents
Acrylic foam and preparation method thereof Download PDFInfo
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- CN114773755A CN114773755A CN202210327461.4A CN202210327461A CN114773755A CN 114773755 A CN114773755 A CN 114773755A CN 202210327461 A CN202210327461 A CN 202210327461A CN 114773755 A CN114773755 A CN 114773755A
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—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
- 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
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—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
- 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
- C08J9/104—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof
- C08J9/105—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof containing sulfur
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—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
- 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
- C08J9/107—Nitroso compounds
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
- C08J2333/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C08J2333/08—Homopolymers or copolymers of acrylic acid esters
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Abstract
The invention discloses acrylic foam and a preparation method thereof, and relates to the technical field of foamed polymers. The weight parts of the raw materials are as follows: 100 parts of acrylic resin, 0.5-6.0 parts of color paste, 1.0-7.0 parts of foaming agent, 0-0.3 part of dispersing agent, 0.01-5.0 parts of curing agent, 0-2.0 parts of nucleating agent, 0.1-5.0 parts of foam stabilizer and 200-400 parts of organic solvent; the preparation method comprises the steps of fully stirring and mixing the prepared acrylic resin, color paste, foaming agent, dispersing agent, curing agent, nucleating agent, foam stabilizer and organic solvent, coating, drying the solvent, foaming and curing. Compared with the prior art, the preparation method has the advantages of low equipment requirement degree, simple operation and low cost, and compared with the acrylic foam manufactured by the prior art, the product has the advantages of thinness, high buffering performance, good filling performance and weather resistance, and particularly has excellent compression resilience.
Description
Technical Field
The invention relates to the technical field of foaming polymers, in particular to acrylic foam and a preparation method thereof.
Background
With the development of science and technology, the development of various electronic products is also changing day by day. In recent years, as related electronic products such as mobile phones, tablet computers and personal computers are thinned and lightened, the requirement for thinning of related materials such as foam materials applied to the electronic products is higher and higher, and the requirement for impact resistance and shock absorption is stricter. The foam applied to various electronic products comprises PE foam, EVA foam, PU foam, acrylic foam and the like, which are used for absorbing the impact force of the outside on electronic equipment to play a role in protection, and meanwhile, some foam also has good waterproof, antistatic, conductive and flame-retardant effects.
Acrylic foam is an advanced foam material, can be applied to a display module of electronic equipment, has excellent buffering, protecting, sealing and gap filling performances, and has unique self-adhesiveness. However, the existing acrylic foam foaming technology mainly forms a porous structure by adding glass or ceramic hollow microspheres and thermally expandable or expanded polymer microspheres, and the foam substrate obtained by adding the microspheres with shells has the following problems: 1. the shell of the microsphere is generally hard, and the elastic deformation range is small, so when the external compressive stress of foam containing the microsphere is large, the shell of the microsphere is easy to deform irreversibly, and the compression resilience of the foam is poor; 2. the hollow microspheres, especially glass microspheres, are low in density and light in weight, are very easy to volatilize in the air to cause air pollution, are easy to be inhaled by a human body from a respiratory tract and cannot be decomposed in the human body, and the operation difficulty of the feeding process or the requirement degree on feeding equipment in the production and processing process of foam cotton is improved. In addition, some industrial processes also use mechanical foaming to produce foam, which is generally carried out in a special foaming machine by filling the material with external gas and under strong shearing action with or without pressure, and then discharging the material from the equipment.
Aiming at the problems, the invention provides a technology for manufacturing acrylic foam by forming a porous structure by generating gas through a chemical foaming method without using hollow microspheres or expandable microspheres, the method has the advantages of simple production process, low requirement on equipment and capability of producing thin foam, and the foam manufactured by the method has the advantages of excellent impact resistance, compression resilience, filling property and the like, and can be used as a buffer material to be applied to a display module of electronic equipment. And no special foaming equipment is additionally arranged, only the coating machine is required to foam, and the operation is simple.
Disclosure of Invention
In order to overcome the technical defects, the invention provides acrylic foam and a preparation method thereof, which aim to solve the problems related to the background technology.
The invention provides acrylic foam which comprises the following raw materials in parts by weight:
100 parts of acrylic resin, 0.5-6.0 parts of color paste, 1.0-7.0 parts of foaming agent, 0-0.3 part of dispersing agent, 0.01-5.0 parts of curing agent, 0-2.0 parts of nucleating agent, 0.1-5.0 parts of foam stabilizer and 200-400 parts of organic solvent.
Preferably or optionally, the acrylic resin comprises the following raw materials in parts by weight: 90-100 parts of alkyl acrylate monomer, 1-10 parts of polar monomer, 0.05-1.0 part of free radical initiator and 100-300 parts of organic solvent.
Preferably or optionally, the alkyl acrylate monomer is one or more selected from alkyl C1-12 acrylate monomers and methacrylate monomers.
Preferably or alternatively, the polar monomer is one or more selected from acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, hydroxybutyl acrylate, hydroxybutyl methacrylate, acrylamide, methacrylamide, acrylonitrile or methacrylonitrile.
Preferably or optionally, the foaming agent is one or more selected from azo compounds, nitroso compounds and benzenesulfonyl hydrazine compounds.
The invention also provides a preparation method of the acrylic foam, which comprises the following steps:
reacting 90-100 parts of alkyl acrylate monomers or alkyl methacrylate monomers, 1-10 parts of (methyl) acrylate polar functional monomers, 0.05-0.8 part of free radical initiator and 100-300 parts of organic solvent at 60-80 ℃ to prepare acrylic resin;
II, fully stirring and mixing 100 parts of acrylic resin, 0.5-6.0 parts of color paste, 1.0-7.0 parts of foaming agent, 0-0.2 part of dispersing agent, 0.01-5.0 parts of curing agent, 0-2.0 parts of nucleating agent, 0.1-5.0 parts of foam stabilizer and 100-500 parts of organic solvent;
uniformly coating the mixture obtained in the step II on a release film bottom liner through a coater, fully drying the mixture through a hot oven to remove the solvent, and attaching a release film protective layer to obtain a semi-finished product;
IV, fully curing the semi-finished product obtained in the step III at the temperature of 40-60 ℃;
and V, placing the cured semi-finished product obtained in the step IV into a hot oven for foaming, and obtaining a foam finished product after the predetermined thickness is reached.
Preferably or optionally, the glass transition temperature of the acrylic resin is-20 ℃ to 5 ℃.
Preferably or optionally, the nucleating agent is one or more selected from talcum powder, clay, calcium carbonate, silicon dioxide and montmorillonite, and the particle size is 1000-4000 meshes.
Preferably or optionally, the foam stabilizer is a modified polysiloxane surfactant.
Preferably or optionally, the release liner layer and the release film protective layer are PET release films with the thickness of 25-75 μm.
Compared with the prior art, the invention has the following beneficial effects:
according to the preparation method of the acrylic foam, the foaming agent in the acrylic generates gas at a certain temperature to form a porous structure, so that the technology for preparing the acrylic foam has high elasticity and is not easy to deform irreversibly under the condition of a large compression ratio. The acrylic acid used as the matrix material can endow the foam with high resilience by the polar monomer, and the foam has high impact resistance by the acrylate monomer. In addition, compared with the prior art, the preparation method has the advantages of low requirement on equipment, simple operation and low cost, and compared with the acrylic foam manufactured by the prior art, the product has the advantages of thinness, high buffering performance, good filling performance and weather resistance, and particularly has excellent compression resilience.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.
The invention is further illustrated by the following examples, which are intended to be illustrative of the invention and are not to be construed as limiting the invention. The examples, where specific techniques and reaction conditions are not indicated, can be carried out according to the techniques or conditions or product specifications described in the literature in the field. Reagents, instruments or equipment of any manufacturer not indicated are commercially available.
Synthesis of acrylic resin (A-1)
In a reactor, mixing 80 parts of methyl methacrylate, 150 parts of butyl acrylate, 7 parts of acrylic acid, 0.35 part of benzoyl peroxide and 460 parts of ethyl acetate, carrying out free radical polymerization reaction at 80 ℃ under the protection of nitrogen, adding 0.55 part of benzoyl peroxide after reacting for 3h, continuing to react for 3h, and finishing the reaction to obtain the acrylic resin adhesive (A1), wherein Tg is about-15 ℃, and viscosity is 5000-20000 cP.
Synthesis of acrylic resin (A-2)
In a reactor, 40 parts of methyl methacrylate, 174 parts of ethyl acrylate, 30 parts of butyl acrylate, 10 parts of hydroxyethyl acrylate, 0.2 part of azobisisobutyronitrile and 360 parts of ethyl acetate are mixed, free radical polymerization reaction is carried out at 65 ℃ under the protection of nitrogen, 0.4 part of azobisisobutyronitrile is added after 3 hours of reaction, the temperature is raised to 70 ℃ for continuous reaction for 3 hours, and the reaction is finished to obtain the acrylic resin adhesive (A2), wherein the Tg is about-10 ℃, and the viscosity is 5000-.
Synthesis of acrylic resin (A-3)
In a reactor, 60 parts of methyl methacrylate, 170 parts of ethyl acrylate, 30 parts of 2-ethylhexyl acrylate, 5 parts of acrylic acid, 7 parts of hydroxyethyl acrylate, 0.3 part of azobisisoheptonitrile and 300 parts of ethyl acetate are mixed, free radical polymerization is carried out at 65 ℃ under the protection of nitrogen, 0.5 part of azobisisoheptonitrile is added after 3 hours of reaction, the temperature is raised to 70 ℃ and the reaction is continued for 3 hours, and the reaction is finished, so that the acrylic resin adhesive (A3) is obtained, the Tg is-5 ℃, and the viscosity is 50-200 poise.
In the foaming process, the selection of a proper nucleating agent is helpful for reducing the activation energy barrier in the bubble nucleus generation process, improving the nucleation rate, reducing the cell size and the distribution of the cell size, and improving the cell density. In the process of foaming a polymer, selecting and adding a proper nucleating agent is usually determined by experience or repeated tests, the nucleating efficiency is related to the type, shape, size, dosage, surface property and dispersion state of the nucleating agent, the selected nucleating agent is derived from commercial inorganic powder, and after screening tests, the inorganic powder between 1000 meshes and 4000 meshes is found to have better dispersibility in a chemical foaming system, the foamed cell density is high, and the foamed body has more ideal cell size and size distribution state.
The selection of the PET release film is usually selected by considering the actual peeling force, after foaming is finished, the release film protective layer needs to be peeled off firstly before foam is used, then the release film bottom lining needs to be peeled off, the peeling force of the release film protective layer is generally controlled to be 1-5gf/25mm, correspondingly, the peeling force of the release film bottom lining is controlled to be 8-20gf/25mm, and therefore the release film protective layer and the bottom lining can be smoothly peeled off.
The silicone compounds, generally called silicone oils, are hydrophobic and modified by modification, usually by grafting hydrophilic polyether segments, to give modified silicone oils, the structure of which is hydrophilic on one end and lipophilic on the other. The modified silicone oil is selected, a certain amount of the modified silicone oil is added, so that a good nucleation effect and a foam stabilizing effect can be achieved in a chemical foaming process, the surface tension of a foaming system can be reduced, bubbles can be smoothly formed and slowly increased, in addition, the modified silicone oil can also have the effect of stabilizing the foam, the foam strength is improved, and the foam is not easy to break.
Wherein, the foaming agent added in the preparation of the acrylic resin is selected from (1) azo compounds, such as 2,2' -azobisisobutyronitrile, diisopropyl azodicarboxylate, barium azodicarboxylate, azodicarbonamide, azoaminobenzene, diethyl azodicarboxylate, and the like; (2) nitroso compounds such as N, N '-dimethyl-N, N' -dinitrosoterephthalamide, N-dinitrosopentamethylenetetramine, etc.; (3) benzenesulfonyl hydrazines such as p-toluenesulfonyl hydrazide, 4' -oxybisbenzenesulfonyl hydrazide, 3' -disulfonyl hydrazide diphenyl sulfone, 1, 3-benzenedisulfonyl hydrazide, p-toluenesulfonyl semicarbazide, 4' -oxybis (benzenesulfonylamino urea), trihydrazino triazine and the like, and further preferably a solid foaming agent having a decomposition temperature in the range of 130-160 ℃, and may be selected from one or more of azodicarbonamide and a modified commercial product of a compounded activator (i.e., a modified AC foaming agent), a modified commercial product of N, N-dinitrosopentamethylenetetramine and an activator (i.e., a modified foaming agent H), 4' -oxybisbenzenesulfonyl hydrazide (i.e., OBSH), 3' -disulfonyl hydrazide diphenyl sulfone having a particle diameter in the range of 5-20 μm, for example, a modified AC foaming agent of a new Dongguan Europe material, Modified foaming agent H of the Univax Xinao rubber and plastic technology, OBSH of the Aladdin reagent company.
The names of the substances used in the following examples and comparative examples and their sources are shown in Table 1:
TABLE 1
Example 1
100 parts of A-1, 2.0 parts of BLACK-117, 2.0 parts of modified AC foaming agent, 0.03 part of BYK-9076, 0.05 part of NE-100X, 0.6 part of HT-15, 1.0 part of M-8805 and 300 parts of toluene are fully and uniformly mixed, then the mixture is uniformly coated on a PET release film by a coater, and then the mixture is baked in an oven at 100 ℃ for 3min to remove the solvent, so as to obtain a coating with the thickness of 60 mu M, then the PET release film is pasted on the surface of the coating to obtain a semi-finished product, the semi-finished product is cured in the oven at 50 ℃ for 48H, and finally the semi-finished product is foamed in the oven at 160 ℃, so that the thickness of the finished product is 100 mu M, and the density of 0.7g/cm 3.
Example 2
100 parts of A-1, 2.0 parts of BLACK-117, 3.0 parts of OBSH, 0.06 part of BYK-9076, 0.1 part of NE-100X, 0.3 part of HT-15, 2.0 parts of M-8805 and 300 parts of toluene are fully and uniformly mixed, then the mixture is uniformly coated on a PET release film by a coater, and then the mixture is baked in a 100 ℃ oven for 3min to remove the solvent, so as to obtain a coating with the thickness of 60 mu M, then the PET release film is pasted on the surface of the coating to obtain a semi-finished product, the semi-finished product is cured in a 50 ℃ oven for 48H, and finally the semi-finished product is foamed in a 150 ℃ oven, so that the thickness of the finished product is 100 mu M, and the density is 0.7g/cm 3.
Example 3
Fully and uniformly mixing 100 parts of A-2, 3.0 parts of BLACK-117, 2.0 parts of modified H foaming agent, 0.03 part of BYK-2157, 1.5 parts of L-75, 0.3 part of TD-50, 2.0 parts of H-3626 and 250 parts of toluene, uniformly coating on a PET release film by using a coater, baking in a 100 ℃ oven for 3min to remove the solvent to obtain a coating with the thickness of 60 mu m, then laminating the PET release film on the surface of the coating to obtain a semi-finished product, curing the semi-finished product in a 50 ℃ oven for 48H, and finally foaming in a 160 ℃ oven, wherein the thickness of the finished product is 100 mu m, and the density is 0.7g/cm3。
Example 4
Fully and uniformly mixing 100 parts of A-2, 3.0 parts of BLACK-117, 4 parts of OBSH foaming agent, 0.08 part of BYK-2157, 2.5 parts of L-75, 0.8 part of TD-50, 3 parts of H-3626 and 250 parts of methylbenzene, uniformly coating on a PET release film by using a coater, baking for 3min at 100 ℃ to remove the solvent to obtain a coating with the thickness of 60 mu m, then pasting the PET release film on the surface of the coating to obtain a semi-finished product, curing the semi-finished product in a 50 ℃ baking oven for 48H, and finally foaming in a 150 ℃ baking oven to obtain the finished product with the thickness of 100 mu m and the density of 0.7g/cm3。
Example 5
Fully and uniformly mixing 100 parts of A-3, 4.0 parts of color paste, 2.0 parts of modified AC foaming agent, 0.03 part of BYK-9076, 0.05 part of 100X, 1.0 part of L-75, 0.5 part of Z-2000, 2.0 part of M-8805 and 330 parts of toluene, uniformly coating on a PET release film by using a coater, baking in an oven at 100 ℃ for 3min to remove the solvent to obtain a coating with the thickness of 60 mu M, then pasting the PET release film on the surface of the coating to obtain a semi-finished product, and placing the semi-finished product at 50 DEG CCuring in an oven for 48H, and finally foaming in an oven at 160 ℃, wherein the thickness of the finished product is 100 mu m, and the density is 0.7g/cm3。
Example 6
Fully and uniformly mixing 100 parts of A-3, 4.0 parts of color paste, 2.0 parts of modified foaming agent H, 0.03 part of BYK-2157, 2.0 parts of L-75, 0.5 part of Z-3000, 2.0 parts of H-362 and 330 parts of ETAC, uniformly coating on a PET release film by using a coater, baking in a 100 ℃ oven for 3min to remove the solvent to obtain a coating with the thickness of 60 mu m, then laminating the PET release film on the surface of the coating to obtain a semi-finished product, curing the semi-finished product in a 50 ℃ oven for 48H, and finally foaming in a 160 ℃ oven to obtain the finished product with the thickness of 100 mu m and the density of 0.7g/cm3。
Comparative example 1
Fully mixing 100 parts of A-1, 2.0 parts of BLACK-117, 2.0 parts of 920DU20, 0.06 part of BYK-9076, 0.1 part of NE-100X and 300 parts of toluene uniformly, then uniformly coating on a PET release film by using a coater, then baking in an oven at 100 ℃ for 3min to remove the solvent to obtain a coating with the thickness of 60 mu m, then foaming in the oven at 150 ℃ to 100 mu m, and finally curing in the oven at 50 ℃ for 48H to obtain a finished product with the density of 0.7g/cm3。
Comparative example 2
Fully and uniformly mixing 100 parts of A-2, 3.0 parts of BLACK-117, 2.0 parts of 920DU20, 0.08 part of BYK-2157, 2.5 parts of L-75 and 250 parts of toluene, uniformly coating on a PET release film by using a coater, baking in an oven at 100 ℃ for 3min to remove the solvent to obtain a coating with the thickness of 60 mu m, foaming in the oven at 150 ℃ to 100 mu m, and curing in the oven at 50 ℃ for 48H to obtain a finished product with the density of 0.7g/cm3。
Comparative example 3
Fully and uniformly mixing 100 parts of A-3, 4.0 parts of color paste, 2.0 parts of 920DU20, 0.03 part of BYK-9076, 0.05 part of NE-100X, 1.0 part of L-75 and 330 parts of toluene, then uniformly coating on a PET release film by using a coater, then baking for 3min at 100 ℃ to remove the solvent to obtain a coating with the thickness of 60 mu m, then foaming in a baking oven at 150 ℃ to 100 mu m, finally curing in a baking oven at 50 ℃ for 48H to obtain a finished product with the density of 0.7g/cm3。
The test results of each example are shown in table 2.
TABLE 2
As is obvious from the table, the compression rebound loss rate of the examples 1 to 6 is much higher than that of the comparative examples 1 to 3, the impact resistance is higher than that of the comparative examples 1 to 3, and the difference between the examples and the comparative examples is that all the comparative examples do not contain foaming agent when collodion is prepared, and the curing temperature is higher than the baking temperature (the baking temperature is the same as the foaming temperature of the examples 1 to 6); in addition, as can be seen from the above table, in examples 1 to 3, the acrylic collodion obtained in example 6 has higher compressive strength and higher impact strength.
Note: the point impact test method comprises the following steps: on a falling ball impact test device, a 30g mass steel ball is adopted and falls from the height of 10cm, and a blank test value V is firstly tested1Then the sample to be tested is spread on the surface of the test platform, and the same small balls are dropped from the same height to obtain a test value V2The point impact energy absorption rate is (V)1-V2)/V1100%, average at least 5 times per sample tested.
The surface impact test method comprises the following steps: on a falling ball impact test device, a piece of glass with the thickness of 0.7mm is placed on the surface of a test platform, a 30g mass steel ball is adopted to fall from the height of 10cm, a blank test value V1 is firstly tested, then a sample with the size of 40mm x 30mm is flatly paved on the surface of the glass, the tested sample is placed downwards on the surface of the test platform, the same small balls fall from the same height to obtain a test value V2, the surface impact energy absorption rate is (V1-V2)/V1 x 100%, and each sample is tested for at least 5 times to take an average value.
25% compressive strength and compression rebound test: making sample into 25 × 25mm and 10mm thick, compressing at 10mm/mm speed on a tensile machine in a compression test modeThe compression ratio was 75%, and a compressive stress at a compression ratio of 25% was obtained on the compression curve. Placing the compressed sample for 30min for sufficient rebound, and testing the thickness T again1(T) compression rebound loss ratio1-10)/10*100％。
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
Claims (10)
1. The acrylic foam is characterized by comprising the following raw materials in parts by weight:
100 parts of acrylic resin, 0.5-6.0 parts of color paste, 1.0-7.0 parts of foaming agent, 0-0.3 part of dispersing agent, 0.01-5.0 parts of curing agent, 0-2.0 parts of nucleating agent, 0.1-5.0 parts of foam stabilizer and 200-400 parts of organic solvent.
2. The acrylic foam as claimed in claim 1, wherein the acrylic resin comprises the following raw materials in parts by weight: 90-100 parts of alkyl acrylate monomer, 1-10 parts of polar monomer, 0.05-1.0 part of free radical initiator and 100-300 parts of organic solvent.
3. The acrylic foam as claimed in claim 2, wherein the alkyl acrylate monomer is one or more selected from alkyl C1-12 acrylate monomers and methacrylate monomers.
4. The acrylic foam according to claim 2, wherein the polar monomer is one or more selected from acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, hydroxybutyl acrylate, hydroxybutyl methacrylate, acrylamide, methacrylamide, acrylonitrile or methacrylonitrile.
5. The acrylic foam according to claim 1, wherein the foaming agent is one or more selected from azo compounds, nitroso compounds, and benzenesulfonyl hydrazide compounds.
6. The preparation method of the acrylic foam is characterized by comprising the following steps:
reacting 90-100 parts of alkyl acrylate monomers or alkyl methacrylate monomers, 1-10 parts of (methyl) acrylate polar functional monomers, 0.05-0.8 part of free radical initiator and 100-300 parts of organic solvent at 60-80 ℃ to prepare acrylic resin;
II, fully stirring and mixing 100 parts of acrylic resin, 0.5-6.0 parts of color paste, 1.0-7.0 parts of foaming agent, 0-0.2 part of dispersing agent, 0.01-5.0 parts of curing agent, 0-2.0 parts of nucleating agent, 0.1-5.0 parts of foam stabilizer and 100-500 parts of organic solvent;
uniformly coating the mixture obtained in the step II on a release film bottom liner through a coater, fully drying the mixture through a hot oven to remove the solvent, and attaching a release film protective layer to obtain a semi-finished product;
IV, fully curing the semi-finished product obtained in the step III at the temperature of 40-60 ℃;
and V, placing the cured semi-finished product obtained in the step IV into a hot oven for foaming, and obtaining a foam finished product after the predetermined thickness is reached.
7. The acryl foam according to claim 6, wherein the glass transition temperature of the acryl resin is-20 ℃ to 10 ℃.
8. The acrylic foam as claimed in claim 6, wherein the nucleating agent is one or more selected from talc, clay, calcium carbonate, silica and montmorillonite, and the particle size is 1000-4000 meshes.
9. The acrylic foam according to claim 6, wherein the foam stabilizer is a modified polysiloxane surfactant.
10. The acrylic foam as claimed in claim 6, wherein the release liner layer and the release liner protective layer are PET release films with a thickness of 25-75 μm.
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