阅读说明：本技术 一种uv丙烯酸酯发泡体及其制备方法和应用 (UV acrylate foam and preparation method and application thereof ) 是由 代光 王泽勇 于 2021-07-16 设计创作，主要内容包括：本发明公开了一种UV丙烯酸酯发泡体及其制备方法和应用,该UV丙烯酸酯发泡体的制备原料包括：丙烯酸酯软单体、丙烯酸酯硬单体、丙烯酸酯功能单体、光引发剂、色浆和发泡粒子。本发明先利用丙烯酸酯软单体、丙烯酸酯硬单体、丙烯酸酯功能单体和光引发剂进行UV紫外光辐照制成UV丙烯酸酯泡棉预聚体,再由UV丙烯酸酯泡棉预聚体及发泡粒子热发泡形成所需UV丙烯酸酯发泡体,UV丙烯酸酯发泡体保留UV丙烯酸酯泡棉预聚体的优势,具有优良的缓冲减震性能,抗冲击性强,能作为缓冲材料应用于电子产品中,起到电子产品的保护作用,制备工艺简单,无溶剂,无环境污染,成本低,适合工业化推广使用。(The invention discloses a UV acrylate foaming body and a preparation method and application thereof, wherein the preparation raw materials of the UV acrylate foaming body comprise: acrylate soft monomer, acrylate hard monomer, acrylate functional monomer, photoinitiator, color paste and foaming particles. The UV acrylate foam prepolymer is prepared by UV ultraviolet irradiation of an acrylate soft monomer, an acrylate hard monomer, an acrylate functional monomer and a photoinitiator, and then the UV acrylate foam prepolymer and foam particles are subjected to thermal foaming to form the required UV acrylate foam, the UV acrylate foam retains the advantages of the UV acrylate foam prepolymer, has excellent buffering and damping properties and strong impact resistance, can be used as a buffering material to be applied to electronic products to play a role in protecting the electronic products, has a simple preparation process, is free of solvent, has no environmental pollution, is low in cost, and is suitable for industrial popularization and use.)

1. The UV acrylate foam is characterized by comprising the following preparation raw materials in parts by weight: 50-80 parts of acrylate soft monomer, 20-40 parts of acrylate hard monomer, 1-5 parts of acrylate functional monomer, 1-5 parts of photoinitiator, 1-5 parts of color paste and 2-8 parts of foaming particles.

2. The UV acrylate foam body as claimed in claim 1, wherein the acrylate soft monomer is one or more of butyl acrylate, isobutyl acrylate, ethyl acrylate and isooctyl acrylate.

3. The UV acrylate foam body as claimed in claim 1, wherein the acrylate hard monomer is one or more of styrene, ethyl methacrylate, methyl methacrylate and isobornyl methacrylate.

4. The UV acrylate foam body as claimed in claim 1, wherein the acrylate functional monomer is one or more of hydroxyethyl acrylate, 2-hydroxypropyl acrylate, N-methylolacrylamide, acrylic acid and acrylamide.

5. The UV acrylate foam body as claimed in claim 1, wherein the photoinitiator is one or more of 859 initiator, TPO initiator, 184 initiator, benzoin dimethyl ether and benzoin isopropyl ether.

6. The UV acrylate foam body as claimed in claim 1, wherein the foamed particles are thermoplastic hollow polymer microspheres, the particle size of the microspheres is 5-50 μm, the thermal expansion temperature is 110-180 ℃, and the particle size after expansion is 30-150 μm.

7. The method of any one of claims 1 to 6 for preparing a UV acrylate foam, comprising the steps of:

1) preparation of UV acrylate foam prepolymer

Mixing 55-80% by mass of an acrylate soft monomer, 55-80% by mass of an acrylate hard monomer, 10-30% by mass of an acrylate functional monomer and 10-40% by mass of a photoinitiator, placing the mixture in a reaction kettle, introducing nitrogen, irradiating by UV (ultraviolet) light, and stopping reaction when the viscosity of the prepolymer is 3000-5000cps to obtain the required UV acrylate foam prepolymer;

2) adding the balance of photoinitiator, acrylate soft monomer, acrylate hard monomer, acrylate functional monomer, all color pastes and foaming particles into the UV acrylate foam prepolymer obtained in the step 1), mixing uniformly, coating the mixture on a release layer after defoaming, placing the release layer under a UV ultraviolet lamp to be cured into a film, adhering the release layer, rolling, unreeling, passing through two sections of circular high-precision heating rollers, wherein the temperature of the first section of heating roller is 70-120 ℃, the temperature of the second section of heating roller is 110-200 ℃, and the foaming particles are expanded by heating to obtain the required UV acrylate foam.

8. Use of a UV acrylate foam according to any one of claims 1-6 for the preparation of acrylate foam single-sided tape and acrylate foam double-sided tape.

9. The use of the UV acrylate foam according to claim 8 in the preparation of an acrylate foam single-sided tape, wherein the acrylate foam single-sided tape comprises the UV acrylate foam prepared by the preparation method of the UV acrylate foam according to claim 7 and an acrylic pressure sensitive adhesive layer attached to the UV acrylate foam, the thickness of the UV acrylate foam is 80-200 μm, and release layers are respectively arranged on one side of the acrylic pressure sensitive adhesive layer away from the UV acrylate foam and one side of the UV acrylate foam away from the acrylic pressure sensitive adhesive layer.

10. The use of the UV acrylate foam according to claim 8 in the preparation of an acrylate foam double-sided tape, wherein the acrylate foam double-sided tape comprises two acrylic pressure sensitive adhesive layers and the UV acrylate foam arranged between the two acrylic pressure sensitive adhesive layers and prepared by the preparation method of the UV acrylate foam according to claim 7, the thickness of the UV acrylate foam layer is 80-200 μm, and the surfaces of the two acrylic pressure sensitive adhesive layers, which are far away from the UV acrylate foam, are respectively provided with a release layer.

Technical Field

The invention belongs to the technical field of electronic application tapes, and particularly relates to a UV acrylate foaming body and a preparation method and application thereof.

Background

The electronic product is inevitably collided and dropped in the using process, which brings great challenges to the use safety performance and the service life of the electronic product. The acrylic ester foam product with the buffering and shock-absorbing functions can protect electronic products, play a role in buffering and shock absorption in the use process of the electronic products, and greatly prolong the service life of the electronic products.

The existing acrylic acid foam adhesive tape technology, such as Chinese invention patent CN 110564309A, discloses a solvent-free acrylic ester adhesive composition and a preparation method of an ultrathin foam adhesive tape thereof, an acrylic ester monomer and an SIS elastomer are polymerized into a whole by a UV polymerization technology, the acrylic ester monomer is used as a main material, a small amount of SIS elastomer is matched, and a modified acrylic ester foam adhesive tape product with ultrahigh bonding strength and excellent waterproof buffering performance is obtained by multi-step reaction. Similarly, the existing acrylic acid UV curing foam adhesive tape technology is as in chinese invention patent CN 110791205 a, disclosing an adhesive and UV curing integrally formed self-adhesive foam adhesive tape and a preparation method thereof, adopting a way of blending polyacrylate and SEBS thermoplastic elastomer, and obtaining an acrylic ester foam product with higher tensile strength, excellent impact resistance, high peel strength, high shear strength and good waterproofness by modifying acrylic ester through the SEBS thermoplastic elastomer with stronger toughness.

The traditional acrylic ester foam technology is as in Chinese invention patent CN 106674417A, and discloses an acrylic foam adhesive tape composition and a method for preparing the acrylic foam adhesive tape, wherein UV-initiated polymerization and thermal polymerization crosslinking are performed to form a foam base material layer, then acrylic monomers, reaction aids, bridging agents, tackifiers and additives are selected and mixed to be coated on two sides of the foam base material layer, so that an acrylic ester foam product is obtained, and the acrylic ester foam product is applied to permanent fixation of automobiles and electronic products and can prevent collision between injected objects.

The existing acrylic foaming shock absorption foam and a preparation method thereof are disclosed as Chinese invention patent CN 112680139A, the acrylic foaming shock absorption foam is applied to an OLED module, an acrylic foam layer is formed by coating and drying a coating liquid formed by mixing an acrylic polymer, a curing agent, foaming microspheres, an inorganic filler, a dispersing agent, an inorganic pigment and an organic solvent, and the obtained acrylic foam adhesive tape can absorb impact force and has excellent impact absorbability.

The traditional polyacrylate, acrylic acid foam composition, acrylic acid foam adhesive tape and preparation method and application thereof are disclosed in Chinese invention patent CN 111072847A, and polyacrylate is prepared by acrylate monomer, organic solvent and other components in a segmented thermal polymerization mode. But the temperature distribution of the drying tunnel is difficult to control accurately, and the problem of uneven foaming thickness exists.

The existing acrylic ester foam adhesive tape mostly adopts an ultraviolet curing mode, a thermosetting mode or a mode of combining the ultraviolet curing mode and the thermosetting mode, the polymerization time is long, thermosetting is mostly solvent-based acrylic ester, solvent volatilization can cause certain pollution to the environment, other elastic particles are mostly needed to be added for modification of the ultraviolet curing foam adhesive tape, the preparation process is also complex, and the process cost is high.

Disclosure of Invention

In order to solve the problems in the prior art, the invention aims to provide a UV acrylate foaming body and a preparation method and application thereof.

In order to achieve the purpose and achieve the technical effect, the invention adopts the technical scheme that:

the UV acrylate foam is prepared from the following raw materials in parts by weight: 50-80 parts of acrylate soft monomer, 20-40 parts of acrylate hard monomer, 1-5 parts of acrylate functional monomer, 1-5 parts of photoinitiator, 1-5 parts of color paste and 2-8 parts of foaming particles.

Furthermore, the acrylate soft monomer is one or a combination of butyl acrylate, isobutyl acrylate, ethyl acrylate and isooctyl acrylate.

Further, the acrylate hard monomer is one or a combination of styrene, ethyl methacrylate, methyl methacrylate and isobornyl methacrylate.

Furthermore, the acrylate functional monomer is one or a combination of more of hydroxyethyl acrylate, 2-hydroxypropyl acrylate, N-hydroxymethyl acrylamide, acrylic acid and acrylamide.

Further, the photoinitiator is one or a combination of more of 859 initiator, TPO initiator, 184 initiator, benzoin dimethyl ether and benzoin isopropyl ether.

Furthermore, the foamed particles are thermoplastic hollow polymer microspheres, the particle size of the microspheres is 5-50 μm, the thermal expansion temperature is 110-180 ℃, the particle size after expansion is 30-150 μm, and the foamed particles have good rebound resilience and different thermal expansion densities.

The invention discloses a preparation method of a UV acrylate foaming body, which comprises the following steps:

1) preparation of UV acrylate foam prepolymer

Mixing 55-80% by mass of an acrylate soft monomer, 55-80% by mass of an acrylate hard monomer, 10-30% by mass of an acrylate functional monomer and 10-40% by mass of a photoinitiator, placing the mixture in a reaction kettle, introducing nitrogen, irradiating by UV (ultraviolet) light, and stopping reaction when the viscosity of the prepolymer is 3000-5000cps to obtain the required UV acrylate foam prepolymer;

2) adding the balance of photoinitiator, acrylate soft monomer, acrylate hard monomer, acrylate functional monomer, all color pastes and foaming particles into the UV acrylate foam prepolymer obtained in the step 1), mixing uniformly, coating the mixture on a release layer after defoaming, placing the release layer under a UV ultraviolet lamp to be cured into a film, adhering the release layer, rolling, unreeling, passing through two sections of circular high-precision heating rollers, wherein the temperature of the first section of heating roller is 70-120 ℃, the temperature of the second section of heating roller is 110-200 ℃, and the foaming particles are expanded by heating to obtain the required UV acrylate foam.

The invention discloses application of a UV acrylate foaming body in preparation of an acrylate foam single-sided adhesive tape and an acrylate foam double-sided adhesive tape.

Further, the acrylic ester foam single-sided tape comprises a UV acrylic ester foam body prepared by the preparation method of the UV acrylic ester foam body as claimed in claim 7 and an acrylic pressure sensitive adhesive layer attached with the UV acrylic ester foam body, wherein the thickness of the UV acrylic ester foam body is 80-200 μm, and a release layer is respectively arranged on one side of the acrylic pressure sensitive adhesive layer far away from the UV acrylic ester foam body and one side of the UV acrylic ester foam body far away from the acrylic pressure sensitive adhesive layer.

Further, the acrylic ester foam double-sided tape comprises two acrylic acid pressure sensitive adhesive layers and a UV acrylic ester foam body which is arranged between the two acrylic acid pressure sensitive adhesive layers and is prepared by the preparation method of the UV acrylic ester foam body of claim 7, wherein the thickness of the UV acrylic ester foam body layer is 80-200 μm, and release layers are respectively arranged on the surfaces, far away from the UV acrylic ester foam body, of the two acrylic acid pressure sensitive adhesive layers.

Compared with the prior art, the invention has the beneficial effects that:

the invention discloses a UV acrylate foaming body and a preparation method and application thereof, wherein the preparation raw materials of the UV acrylate foaming body comprise the following components in parts by weight: 50-80 parts of acrylate soft monomer, 20-40 parts of acrylate hard monomer, 1-5 parts of acrylate functional monomer, 1-5 parts of photoinitiator, 1-5 parts of color paste and 2-8 parts of foaming particles. The UV acrylate foam prepolymer has good viscoelasticity and certain buffering, shock absorption and rebound effects, retains the advantages of the UV acrylate foam prepolymer, has excellent buffering and shock absorption performance and strong impact resistance, can be used as a buffer material to be applied to electronic products to play a role in protecting the electronic products, has a simple preparation process, is free of solvent and environmental pollution, is low in cost, and is suitable for industrial popularization and use.

Drawings

FIG. 1 is a schematic structural diagram of an acrylic ester foam single-sided tape of the present invention;

fig. 2 is a schematic structural diagram of the acrylate foam double-sided tape of the invention.

Detailed Description

The following detailed description of the embodiments of the present invention is provided to enable those skilled in the art to more easily understand the advantages and features of the present invention, and to clearly and clearly define the scope of the present invention.

The UV acrylate foaming body is prepared from the following raw materials in parts by weight: 50-80 parts of acrylate soft monomer, 20-40 parts of acrylate hard monomer, 1-5 parts of acrylate functional monomer, 1-5 parts of photoinitiator, 1-5 parts of color paste and 2-8 parts of foaming particles.

The acrylate soft monomer is one or a combination of butyl acrylate, isobutyl acrylate, ethyl acrylate and isooctyl acrylate.

The acrylate hard monomer is one or a combination of styrene, ethyl methacrylate, methyl methacrylate and isobornyl methacrylate.

The acrylate functional monomer is one or a combination of more of hydroxyethyl acrylate, 2-hydroxypropyl acrylate, N-hydroxymethyl acrylamide, acrylic acid and acrylamide.

The photoinitiator is one or a combination of 859 initiator, TPO initiator, 184 initiator, benzoin dimethyl ether and benzoin isopropyl ether.

The color paste is black color paste or white color paste.

The foamed particles are thermoplastic hollow polymer microspheres, the particle size of the microspheres is 5-50 mu m, the thermal expansion temperature is 110-180 ℃, the particle size after expansion is 30-150 mu m, and the foamed particles have good rebound resilience and different thermal expansion densities.

The invention discloses a preparation method of a UV acrylate foaming body, which comprises the following steps:

1) preparation of UV acrylate foam prepolymer

Mixing 55-80% by mass of an acrylate soft monomer, 55-80% by mass of an acrylate hard monomer, 10-30% by mass of an acrylate functional monomer and 10-40% by mass of a photoinitiator, placing the mixture in a reaction kettle, introducing nitrogen, irradiating by UV (ultraviolet) light, and stopping reaction when the viscosity of the prepolymer is 3000-5000cps to obtain the required UV acrylate foam prepolymer;

2) adding the balance of photoinitiator, acrylate soft monomer, acrylate hard monomer, acrylate functional monomer, all color pastes and foaming particles into the UV acrylate foam prepolymer obtained in the step 1), mixing uniformly, coating the mixture on a release layer 3 after defoaming, placing the release layer under a UV ultraviolet lamp to be cured into a film, adhering the release layer 3 to be wound, then unwinding the film and passing through two sections of round high-precision heating rollers, wherein the temperature of the first section of heating roller is 70-120 ℃, the temperature of the second section of heating roller is 110-200 ℃, and the foaming particles are expanded by heating to obtain the required UV acrylate foam.

The UV ultraviolet light source has a wavelength of 0-365nm and is one or a combination of a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, a hernia lamp, a metal halide lamp, an electrodeless lamp and a laser; the intensity range of UV ultraviolet irradiation is 1-1000mw/cm²The irradiation time is 10-300 s.

The invention also discloses application of the UV acrylate foaming body in preparation of the acrylate foam single-sided adhesive tape and the acrylate foam double-sided adhesive tape.

As a specific embodiment, the acrylic ester foam single-sided tape comprises a UV acrylic ester foam 1 prepared by a preparation method of the UV acrylic ester foam and an acrylic pressure sensitive adhesive layer 2 attached to the UV acrylic ester foam, wherein the thickness of the UV acrylic ester foam 1 is 80-200 μm, and a release layer 3 is respectively arranged on one side of the acrylic pressure sensitive adhesive layer 2 far away from the UV acrylic ester foam 1 and one side of the UV acrylic ester foam 1 far away from the acrylic pressure sensitive adhesive layer 2, as shown in fig. 1.

As a more specific embodiment, the acrylic foam double-sided tape comprises two acrylic pressure-sensitive adhesive layers 2 and a UV acrylic foam 1 which is arranged between the two acrylic pressure-sensitive adhesive layers 2 and is prepared by a preparation method of the UV acrylic foam, wherein the thickness of the UV acrylic foam 1 is 80-200 μm, and a release layer 3 is arranged on one side of the acrylic pressure-sensitive adhesive layer 2 far away from the UV acrylic foam 1, as shown in fig. 2.

Example 1

A preparation method of a UV acrylate foam comprises the following steps:

weighing 280g of butyl acrylate, 210g of ethyl acrylate, 140g of methyl methacrylate, 70g of styrene, 1g of acrylic acid and 2g of N-hydroxymethyl acrylamide, pouring into a reaction kettle, mechanically stirring for 30min under the protection of nitrogen, and fully exhausting air. Then adding 5g859 photoinitiator, stopping irradiation under the irradiation of a UV-LED lamp with the wavelength of 365nm when the viscosity is 3000-5000cps, then cutting off a light source, continuously and stably stirring for 1-3min, and completing the reaction to prepare a series of acrylate prepolymers;

adding the rest 120g of butyl acrylate, 90g of ethyl acrylate, 60g of methyl methacrylate, 30g of styrene, 4g of acrylic acid, 8g N-hydroxymethyl acrylamide, 10g of 859 photoinitiator, 30g of foamed particles NOURYON031DU40 with the particle size of 10-16 mu m and 20g of black color paste into the UV acrylate foam prepolymer obtained in the step 1), uniformly mixing, controlling the thickness of the glue solution to be 50 mu m by using a coater with a gap spacing, coating the glue solution on a release layer 3 or a release film after defoaming, placing the glue solution under a UV ultraviolet lamp for curing to form a film, adhering the release layer 3 or the release film for rolling, then placing the film for rolling through two sections of circular high-precision heating rollers, wherein the temperature of the first section of the heating roller is 90 ℃, the temperature of the second section of the heating roller is 130 ℃, and obtaining the acrylate foam with the thickness of 100-110 mu m after the foamed particles are heated and expanded.

Example 2

A preparation method of a UV acrylate foam comprises the following steps:

380g of butyl acrylate, 210g of ethyl acrylate, 250g of methyl methacrylate, 2g of acrylic acid and 2g of 2-hydroxypropyl acrylate are weighed and poured into a reaction kettle, and the mixture is mechanically stirred for 30min under the protection of nitrogen, so that air is fully exhausted. Then adding 4g of TPO photoinitiator, stopping irradiation when the viscosity is 3000-5000cps under the irradiation of a UV-LED lamp with the wavelength of 365nm, cutting off a light source, continuously and stably stirring for 1-3min, and completing the reaction to prepare a series of acrylate prepolymers;

adding the rest 120g of butyl acrylate, 90g of ethyl acrylate, 90g of methyl methacrylate, 4g of acrylic acid, 8g of acrylic acid-2-hydroxypropyl acrylate, 10g of TPO photoinitiator, 40g of foamed particles NOURYON031DU40 with the particle size of about 10-16 mu m and 30g of black color paste into the UV acrylate foam prepolymer obtained in the step 1), uniformly mixing, controlling the thickness of the glue solution to be 50 mu m by a coater with a gap spacing, coating the glue solution on a release layer 3 after defoaming, placing the release layer under an ultraviolet lamp to be cured to form a film, adhering the release layer 3 to be rolled, then placing the film through two sections of circular high-precision heating rollers, controlling the temperature of the first section of heating roller to be 90 ℃ and the temperature of the second section of heating roller to be 130 ℃, and obtaining the acrylate foam with the thickness of 100-110 mu m after the foamed particles are heated to expand.

The same as in example 1.

Example 3

A preparation method of a UV acrylate foam comprises the following steps:

250g of butyl acrylate, 310g of ethyl acrylate, 210g of styrene, 1g of acrylic acid and 2g of N-hydroxymethyl acrylamide are weighed and poured into a reaction kettle, and the mixture is mechanically stirred for 30min under the protection of nitrogen, so that air is fully exhausted. Then 6g of 184 photoinitiator is added, the irradiation is stopped when the viscosity is 3000-5000cps under the irradiation of a UV-LED lamp with the wavelength of 365nm, then the light source is cut off, the continuous and stable stirring is carried out for 1-3min, the reaction is completed, and a series of acrylate prepolymers are prepared;

adding the rest 120g of butyl acrylate, 90g of ethyl acrylate, 90g of styrene, 4g of acrylic acid, 8g N-hydroxymethyl acrylamide, 10g of 184 photoinitiator, foamed particles NOURYON 461DU40 with the particle size of about 9-15 mu m and black color paste into the UV acrylate foam pre-polymer obtained in the step 1), uniformly stirring, controlling the thickness of the glue solution to be 50 mu m by a coater for controlling the gap distance, defoaming, coating the glue solution on a release layer 3, placing the release layer under an ultraviolet lamp for curing to form a film, adhering the release layer 3 for winding, then unwinding the film to pass through two circular high-precision heating rollers, controlling the temperature of the first section of the heating roller to be 100 ℃, controlling the temperature of the second section of the heating roller to be 150 ℃, and heating and expanding the foamed particles to obtain the acrylate foam layer with the thickness of 100-110 mu m.

The same as in example 1.

Example 4

A preparation method of a UV acrylate foam comprises the following steps:

350g of butyl acrylate, 300g of ethyl acrylate, 310g of methyl methacrylate, 1g of acrylic acid and 2g of 2-hydroxypropyl acrylate are weighed and poured into a reaction kettle, and the mixture is mechanically stirred for 30min under the protection of nitrogen, so that air is fully exhausted. Then 5g of 859 photoinitiator is added, the irradiation is stopped when the viscosity is 3000-5000cps under the irradiation of a UV-LED lamp with the wavelength of 365nm, then the light source is cut off, the continuous and stable stirring is carried out for 1-3min, the reaction is completed, and a series of acrylate prepolymers are prepared.

Adding the rest 120g of butyl acrylate, 90g of ethyl acrylate, 90g of methyl methacrylate, 4g of acrylic acid, 8g of acrylic acid-2-hydroxypropyl acrylate, 10g of 859 photoinitiator, 50g of foamed particles NOURYON909DU80 with the particle size of about 18-24 microns and 40g of black color paste into the UV acrylate foam prepolymer obtained in the step 1), uniformly mixing, controlling the thickness of the glue solution to be 70 microns by a coater for controlling the gap distance, coating the glue solution on a release layer 3, curing the glue solution under an ultraviolet lamp to form a film, adhering the release layer 3, rolling, passing the roll through two sections of circular high-precision heating rollers, controlling the temperature of the first section of heating roller to be 110 ℃, controlling the temperature of the second section of heating roller to be 180 ℃, and heating and expanding the foamed particles to obtain the acrylate foam with the thickness of 140-150 microns.

The same as in example 1.

The parts of the invention not specifically described can be realized by adopting the prior art, and the details are not described herein.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.