CN113604000B - Low-density light-weight foamed TPE material and application thereof - Google Patents
Low-density light-weight foamed TPE material and application thereof Download PDFInfo
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- 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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/32—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof from compositions containing microballoons, e.g. syntactic foams
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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
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- 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
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- C08J9/0085—Use of fibrous compounding ingredients
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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
- C08J2203/22—Expandable microspheres, e.g. Expancel®
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- C08J2353/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2353/02—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers of vinyl aromatic monomers and conjugated dienes
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2453/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2453/02—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers of vinyl aromatic monomers and conjugated dienes
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- C—CHEMISTRY; METALLURGY
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2497/00—Characterised by the use of lignin-containing materials
- C08J2497/02—Lignocellulosic material, e.g. wood, straw or bagasse
Abstract
The invention discloses a low-density light-weight foaming TPE material and application thereof, wherein the TPE material comprises the following components in parts by weight: 70-90 parts of styrene polymer, 10-30 parts of white oil, 0.1-3 parts of thermal expansion microsphere foaming agent, 0.1-1 part of structure reinforcing agent and 0.01-0.1 part of antibacterial agent. The TPE material provided by the invention is foamed by using the thermal expansion microsphere foaming agent, so that the density of an injection molding part can be obviously reduced, the white oil precipitation is reduced, in addition, the modified lyocell fibers are added in the system, the water absorption condition of the system can be reduced, the stable dryness is kept, and the strength of the bra liner can be ensured for a long time.
Description
Technical Field
The invention belongs to the field of foaming materials, and particularly relates to a low-density light-weight foaming TPE material and application thereof.
Background
The liner is one of the key parts of the bra, which not only embodies the female aesthetic feeling, but also supports the female breast, prevents the sagging and ensures the health. The pad material is selected as the most influential factor of comfort, the pad forming process comprises sponge, injection molding, latex and the like, the sponge, pearl cotton, latex cotton, upright cotton and the like are mainly used in the current market, the same foaming process is adopted for the sponge, the pearl cotton, the latex cotton, the upright cotton and the like, the advantages are light, the setting temperature is 210 ℃ plus 180 ℃, the setting period is long, the smell is heavy in the setting process, the influence on the health of operators is great, and secondly, the sponge is easy to age and turn yellow, the cup mouth becomes hard, and the wearing comfort is obviously reduced; in addition, the foaming foam holes are opened, so that the problems of difficult drying and accelerated aging are caused, the easy deformation of scrubbing is further caused, the tearing is seriously and directly caused, and the service life is short; in addition, the proportion of the waste materials in the manufacturing process of sponge and the like is as high as 40-64%, and the disposal of the sponge garbage is a great environmental protection problem for many years.
In recent years, the injection molding TPE liner process has become more mature, and the advantages are particularly obvious, such as the material is transparent, nontoxic and tasteless, can keep more than 150h without cracking under the condition that the stretching ratio reaches 350%, and is closer to the softness of human skin in touch. In addition, zero waste is generated in the processing process, and the pouring gate and defective products can be repeatedly processed and used after being crushed. However, the injection molding process of the TPE liner also has disadvantages, and a considerable part of women like wearing the brassiere made of the environmentally-friendly, non-toxic and safe TPE material for health, want to have the softness of the breast-like room, and want to reduce the weight a little, but the injection molding process of the TPE liner has a high density, and the problem cannot be improved even through the punching process. The brassiere liner needs to do and alleviates work, must last the research on material foaming process, strives to reduce density, just can satisfy more women friends and wear healthy, safety, environmental protection, comfortable brassiere.
At present, the foaming technology in China is mature in the technical fields of EVA (foamed sole), EPDM (ethylene propylene diene monomer foamed automobile door and window sealing strip) and the like, so that the technology is extended in the application field of TPE all the time, the market demand is high, the material density is expected to be greatly reduced through the technology, however, the weight of TPE is reduced by less than 9 percent at most, the yield is low, and the reduction of the density and the cost are still bottlenecks.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems, the invention aims to provide a low-density light-weight foamed TPE material which has low density, high temperature resistance, good mechanical strength and high comfort level and an application thereof in preparing bra liners.
The technical scheme of the invention is as follows:
a low-density light-weight foaming TPE material comprises the following components in parts by weight:
as a further scheme of the low-density light-weight foaming TPE material, the styrene polymer used in the invention is one or more of styrene-ethylene/butylene-styrene copolymer (SEBS) and styrene-ethylene/propylene-styrene block copolymer (SEPS).
As a further aspect of the low density lightweight foamed TPE material of the present invention, the white oil used in the present invention is selected from one or more of 26# and 32# high viscosity food grade white oils.
As a further scheme of the low-density light-weight foaming TPE material, the thermal expansion microsphere foaming agent used in the invention can be selected from a commercially available thermal expansion microsphere foaming agent and a self-made thermal expansion microsphere foaming agent.
Specifically, the thermal expansion microspheres have different foaming temperatures and different foaming densities, and the thermal expansion microsphere foaming agent can be selected according to different processes.
As a further scheme of the low-density light-weight foamed TPE material, the self-made thermal expansion microsphere foaming agent has a composite microsphere structure and comprises an outer layer and an inner layer, wherein the outer layer is a polymer layer, the inner layer is a mixed layer containing a plurality of small microspheres and solid particles, the small microspheres comprise a shell material and a core material, and the solid particles are in contact with the core material and then undergo a chemical reaction to release gas.
As a further scheme of the low-density light-weight foaming TPE material, the composite microspheres of the self-made thermal expansion microsphere foaming agent have the particle size of 30-50 microns, and the small microspheres in the inner layer have the particle size of 0.5-3 microns.
As a further scheme of the low-density light-weight foaming TPE material, the outer layer of the self-made thermal expansion microsphere foaming agent is obtained by carrying out polymerization reaction on a monomer containing double-built polymerizable monomers.
As a further scheme of the low-density light-weight foamed TPE material, the inner layer of the self-made thermal expansion microsphere foaming agent is a mixture layer containing PMMA-coated acetic acid microspheres and calcium carbonate. Preferably, it is ultra-high molecular weight PMMA having a molecular weight of 30 to 50 ten thousand.
Specifically, the self-made heat expandable microspheres used in the present invention release organic acid under heating conditions, and the foaming principle is illustrated as follows by using acetic acid as a representative of the organic acid:
according to the principle, the PMMA-coated acetic acid microspheres release acetic acid under the heating condition, and the acetic acid can react with calcium carbonate to generate CO2Gas and calcium acetate, then the calcium acetate can be decomposed under the heating condition to generate acetone gas and calcium carbonate, and then the calcium carbonate can be continuously reacted with acetic acid. Acetic acid is finally and completely converted into carbon dioxide and acetone gas, and no residue exists in the system, so that the problem of oily substances permeating to the surface can be effectively avoided.
As a further scheme of the low-density light-weight foamed TPE material, the foamed parts of the outer TPE layer are wrapped on the inner layer after the forming, so that the formed bra cups can be kept non-hydrophilic, and are easy to dry and not easy to breed bacteria and mites. In particular, the outer layer has a small thickness relative to the inner layer, and thus large area microsphere foaming can significantly reduce product density.
As a further scheme of the low-density light-weight foamed TPE material, the structural reinforcing agent used in the invention is hydrophobic modified lyocell fiber.
As a further scheme of the low-density light-weight foaming TPE material, the length of the hydrophobic modified lyocell fiber used in the invention is 300-600 mu m, and the diameter of the hydrophobic modified lyocell fiber is 5-15 mu m.
As a further scheme of the low-density light-weight foaming TPE material, the preparation method of the hydrophobic modified lyocell fiber used in the invention comprises the following steps: dissolving the lyocell fiber in water, adding the organic fluorine silicon modifier, uniformly dispersing, filtering to remove water and excessive organic fluorine silicon modifier, and drying in an oven to obtain the hydrophobic modified lyocell fiber.
Specifically, the water used in the above embodiment is ultrapure water.
The ratio of water to lyocell fibre used in the above protocol was 9: 1.
The addition amount of the organic fluorine-silicon modifier used in the scheme is 1-3% of the total mass.
The organofluorosilicone modifiers used in the above scheme are selected from perfluorooctyltrimethoxysilane and/or perfluorodecyltriethoxysilane.
More specifically, the modification method of the lyocell fiber comprises the following steps:
(1) mixing water and the organic fluorine-silicon modifier, and uniformly stirring to obtain a dispersion liquid for later use;
(2) slowly adding the lyocell fibers into the dispersion liquid prepared in the step (1) in batches, and continuing stirring after the fibers are completely added into the system until the average length of the fibers is 300-600 microns;
(3) and (3) filtering the mixed solution prepared in the step (2), and drying the obtained solid at the temperature of 50-70 ℃ to obtain the hydrophobic modified lyocell fiber.
As a further scheme of the low-density light-weight foaming TPE material, the preparation process comprises the following steps:
step 1: preparing raw materials of each component according to parts by weight;
step 2: uniformly mixing, and drying the materials at 60-80 ℃ for 1-2 hours;
and step 3: and (4) molding by using an injection molding machine, wherein the injection molding temperature is adjusted according to the required foaming temperature.
In particular, the microfoamed material cannot stay for a long time in the barrel screw of the injection molding machine, otherwise the reject ratio will rise seriously.
The technical scheme provided by the invention has the beneficial effects that:
according to the invention, the closed foaming is carried out by using the microsphere foaming agent, so that the density of the TPE material is obviously reduced, oil is not separated out, the foaming volume and the foaming uniformity can be obviously improved, and the problem of precipitation and migration of the small-molecule alkane foaming agent can be effectively avoided. In addition, the present invention provides mechanical strength to the generated bubbles by using lyocell fiber, so that the phenomenon of collapse in the case of many pores does not occur. The water absorption of the lyocell fibers is reduced from 40% to less than 5% by performing hydrophobic modification on the lyocell fibers, so that the lyocell fibers do not swell during human perspiration and washing, and the overall structure is not deformed, thereby affecting the service life of the lyocell fibers. The density of the TPE material provided by the invention is greatly reduced, the problem of high weight burden during wearing is solved, and the manufactured liner has the effects of attractive appearance and high comfort.
Drawings
FIG. 1 is a cross-sectional view of a low density lightweight foamed TPE material provided by the present invention.
FIG. 2 is a microscopic view of the hydrophobically modified lyocell fiber 1 prepared in accordance with the present invention.
FIG. 3 is a microscopic view of the hydrophobically modified lyocell fiber 2 prepared in accordance with the present invention.
Fig. 4 is a final microscopic image of hydrophobically modified lyocell fiber 3 prepared in accordance with the present invention.
Detailed description of the invention
The present invention will be further described below by way of specific examples.
In the following examples, those whose operations are not subject to the conditions indicated, are carried out according to the conventional conditions or conditions recommended by the manufacturer. The styrene-ethylene/butylene-styrene copolymer (SEBS) used in the present invention can be selected from the group consisting of Globalprerne 7550, the Barlin petrochemical YH-506, the Barlin petrochemical YH-533, and the Kraton FG 1924X. The styrene-ethylene/propylene-styrene block copolymer (SEPS) used in the present invention may be selected from the group consisting of ba ling petrochemical 4052, ba ling petrochemical 4053, kraton G1701. The foaming agent for heat-expandable microspheres used in the present invention may be selected from F-30, F-36, F36LV, F-48, FN-80GS, F-50, F-65, FN-100SS, FN-100S, F-100M, FN-100M, FN-100, F-105, FN-180SS, FN-180S, FN-180, F-190D, F230D, F-260D, F-2800D, F-2830D, F2860 28 2860D foaming agents for heat-expandable microspheres, which are available from Japan pine oil and fat pharmaceuticals, Inc. The nano silver antibacterial agent used in the invention is selected from the nano silver ion antibacterial agent SCJ-956E of Beijing Jiejieshuang.
The rest raw materials used in the scheme of the invention are purchased from Chinese medicine reagents and Aladdin reagents.
Preparation example 1 of Hydrophobically modified Lyocell fiber
Preparing a dispersion plate, a beaker and a dispersion machine which are sprayed with the tungsten carbide coating.
90g of water and 1g of perfluorooctyltrimethoxysilane, an organic fluorine-silicon modifier, were added to a beaker, and stirred at 400 rpm using a dispersing machine.
10g of lyocell fibre was added slowly in portions to the dispersing beaker, and whether the fibre was added was determined depending on whether the lyocell fibre had been fully opened within the system. Wherein the lyocell fibers have an initial length of about 20mm on average and a diameter of 5 μm.
After the lyocell fibers were completely added to the system, the speed of the disperser was increased to 1000 rpm. Samples were taken every 20 minutes to test the lyocell fibre length and stirring was stopped until the majority of the fibre length fell between 300 μm and 600 μm.
And filtering by using filter paper to obtain modified lyocell fibers, and drying in a 60 ℃ oven to finally obtain the hydrophobic modified lyocell fibers 1.
Preparation example 2 of Hydrophobically modified Lyocell fiber
Preparing a dispersion plate, a beaker and a dispersion machine which are sprayed with the tungsten carbide coating.
90g of water, 2g of the organofluorosilicone modifier perfluorodecyltriethoxysilane were added to a beaker and stirred using a disperser at 400 rpm.
10g of lyocell fibre was added slowly in portions to the dispersing beaker, and whether the fibre was added was determined depending on whether the lyocell fibre had been fully opened within the system. Wherein the lyocell fibers have an initial length of 20mm or so on average and a diameter of 10 μm.
After the lyocell fibers were completely added to the system, the speed of the disperser was increased to 1000 rpm. Samples were taken every 20 minutes to test the lyocell fibre length and stirring was stopped until the majority of the fibre length fell between 300 μm and 600 μm.
And filtering by using filter paper to obtain modified lyocell fibers, and drying in a 60 ℃ oven to finally obtain the hydrophobic modified lyocell fibers 2.
Preparation example 3 of Hydrophobically modified Lyocell fiber
Preparing a dispersion plate, a beaker and a dispersion machine which are sprayed with the tungsten carbide coating.
90g of water, 1g of the organofluorosilicone modifier perfluorodecyltriethoxysilane was added to a beaker and stirred using a disperser at 400 rpm.
10g of lyocell fibre was added slowly in portions to the dispersing beaker, and whether the fibre was added was determined depending on whether the lyocell fibre had been fully opened within the system. Wherein the lyocell fibers have an initial length of about 20mm on average and a diameter of 15 μm.
After the lyocell fibers were completely added to the system, the speed of the disperser was increased to 1000 rpm. Samples were taken every 20 minutes to test the lyocell fibre length and stirring was stopped until the majority of the fibre length fell between 300 μm and 600 μm.
And filtering by using filter paper to obtain modified lyocell fibers, and drying in a 60 ℃ oven to finally obtain the hydrophobic modified lyocell fibers 3.
Example 1
Preparing 400g of Liangrong Globalprerne 7550 resin, 300g of Balingite YH-506 resin, 100g of Kraton FG1924X resin, 180g of 26# food grade white oil, 15g of microsphere foaming agent FN-180SS, 4g of hydrophobically modified Lyocell fiber 1 and 1g of nano silver ion antibacterial agent SCJ-956E raw material;
the materials are evenly mixed and dried for 1.5 hours at the temperature of 80 ℃. The molding was carried out using an injection molding machine at 175 ℃.
Example 2
Preparing 300G of Kraton FG1924X resin, 300G of Barlingpetrochemical 4052 resin, 200G of Kraton G1701 resin, 180G of 32# food-grade white oil, 15G of self-made thermal expansion microsphere foaming agent, 4G of hydrophobically modified lyocell fiber 1 and 1G of nano silver ion antibacterial agent SCJ-956E raw material;
the materials are evenly mixed and dried for 1.5 hours at the temperature of 80 ℃. The mixture was molded by an injection molding machine at 160 ℃.
Example 3
Preparing 300G of Kraton FG1924X resin, 300G of baring petrochemical 4052 resin, 200G of Kraton G1701 resin, 180G of 26# food grade white oil, 15G of microsphere foaming agent F-190D, 4G of hydrophobically modified lyocell fiber 2 and 1G of nano silver ion antibacterial agent SCJ-956E raw material;
the materials are evenly mixed and dried for 1.5 hours at the temperature of 80 ℃. The molding was carried out using an injection molding machine at 215 ℃.
Example 4
Preparing 300G of Liangrong Globalprerne 7550 resin, 200G of baring petrochemical 4053 resin, 250G of Ketengkaton G1701 resin, 215G of 32# food-grade white oil, 24G of microsphere foaming agent F-260D, 4G of hydrophobically modified Lyocell fiber 3 and 1G of nano silver ion antibacterial agent SCJ-956E raw material;
the materials are evenly mixed and dried for 1.5 hours at the temperature of 80 ℃. The mixture was molded by an injection molding machine at a temperature of 250 ℃.
Example 5
Preparing 400g of Liangrong Globalpreen 7550 resin, 370g of Balingite 4053 resin, 202g of 26# food grade white oil, 19g of microsphere foaming agent F230D, 4g of hydrophobically modified lyocell fiber 2 and 1g of nano silver ion antibacterial agent SCJ-956E raw material;
the materials are evenly mixed and dried for 1.5 hours at the temperature of 80 ℃. The mixture was molded by an injection molding machine at 230 ℃.
Example 6
200G of ba ling petrochemical YH-533 resin, 500G of ba ling petrochemical 4052 resin, 50G of Ketengkaton G1701 resin, 215G of 32# food grade white oil, 24G of self-made thermal expansion microsphere foaming agent, 4G of hydrophobic modified lyocell fiber 3 and 1G of nano silver ion antibacterial agent SCJ-956E raw material are prepared;
the materials are evenly mixed and dried for 1.5 hours at the temperature of 80 ℃. The molding was carried out using an injection molding machine at 165 ℃.
Comparative example 1
Preparing 300G of Kraton FG1924X resin, 300G of baring petrochemical 4052 resin, 200G of Kraton G1701 resin, 180G of 32# food-grade white oil, 15G of self-made thermal expansion microsphere foaming agent and 1G of nano silver ion antibacterial agent SCJ-956E raw material;
the materials are evenly mixed and dried for 1.5 hours at the temperature of 80 ℃. The mixture was molded by an injection molding machine at 160 ℃.
Comparative example 2
Preparing 300G of Kraton FG1924X resin, 300G of Barlingpetrochemical 4052 resin, 200G of Kraton G1701 resin, 180G of 32# food grade white oil, 4G of hydrophobically modified lyocell fiber 1 and 1G of raw material of nano silver ion antibacterial agent SCJ-956E;
the materials are evenly mixed and dried for 1.5 hours at the temperature of 80 ℃. The mixture was molded by an injection molding machine at 160 ℃.
The above-mentioned embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments may be used, not restrictive; it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications belong to the protection scope of the present invention.
To illustrate the technical effects of the present invention, the TPE materials prepared in the above examples 1-6 and comparative examples 1-2 were tested for density, high temperature aging, low temperature white oil evolution, and compressive strength retention.
And (3) testing the density: the material is injected into a cylinder with the diameter of 3cm and the length of 6cm, the cylinder is placed in a glass measuring cylinder with the volume of 50mL, ultrapure water is added, the volume is determined to be 50mL, and the density reduction rate of the system are obtained through calculation, wherein the calculation formula is as follows:
density {50- (total mass-cylinder mass-injection molding mass) }/50
Percent reduction in density (%) — example density/unfoamed density
And (3) high-temperature aging test: the material was injection molded into 5cm by 5cm cubes and placed in an aging oven with ultraviolet lamps at 40 ℃ for 36 hours. Focusing on the surface tack and height maintenance (test height/initial height), 3 samples were tested per example and averaged.
Low temperature white oil precipitation test: the material was injection molded into 5cm by 5cm cubes and placed in a freezer at-18 ℃ for 120 hours, and the amount of white oil that separated out was determined by noting the sticky hand condition on the surface, and 3 samples were averaged for each example.
Pressing strength retention: the material was injection molded into 5cm by 5cm cubes, each example was repeatedly pressed with an external force of 100N, and the height maintenance (test height/initial height) was tested 3000 times, and 3 samples were averaged for each example.
*Note: in the above table, comparative example 2 was not foamed, and thus the height maintenance was superior to that of the other examples, without having a contrast.
As can be seen from the data in the above table, the TPE material provided by the invention has obviously reduced density, still has very good strength under the condition of porosity, and effectively overcomes the problem of oil bleeding.
Claims (7)
1. The low-density light-weight foaming TPE material is characterized by comprising the following components in parts by weight:
70-90 parts of styrene polymer
10-30 parts of white oil
0.1-3 parts of thermal expansion microsphere foaming agent
0.1-1 part of structure reinforcing agent
0.01 to 0.1 portion of antibacterial agent,
the styrene polymer is selected from one or more of styrene-ethylene/butylene-styrene copolymer, styrene-ethylene/propylene-styrene block copolymer and styrene-1, 4-butadiene-1, 2-butadiene-styrene copolymer;
the structural reinforcing agent is hydrophobic modified lyocell fiber; the length of the hydrophobic modified lyocell fiber is 300-600 mu m, and the diameter of the hydrophobic modified lyocell fiber is 5-15 mu m;
the modification method of the hydrophobic modified lyocell fiber comprises the following steps: dissolving the lyocell fiber in water, adding the organic fluorine silicon modifier, uniformly dispersing, filtering to remove water and excessive organic fluorine silicon modifier, and drying in an oven to obtain the hydrophobic modified lyocell fiber.
2. The low density, lightweight, foamed TPE material of claim 1 wherein said white oil is selected from one or more of 26# and 32# high viscosity food grade white oils.
3. The low-density and light-weight foamed TPE material as claimed in claim 1, wherein the thermal expansion microsphere type foaming agent has a composite microsphere structure comprising an outer layer and an inner layer, wherein the outer layer is a polymer layer, the inner layer is a mixed layer comprising a plurality of microspheres and solid particles, the microspheres comprise a shell material and a core material, and the solid particles are in contact with the core material and then undergo a chemical reaction to release gas.
4. The low-density light-weight foaming TPE material as claimed in claim 3, wherein the outer layer of the thermal expansion microsphere foaming agent is obtained by polymerization reaction of polymerizable monomers containing double bonds, and the inner layer of the thermal expansion microsphere foaming agent is a mixture containing PMMA-coated acetic acid microspheres and calcium carbonate.
5. The low-density lightweight foamed TPE material as in claim 1 wherein the antimicrobial agent is a nano silver antimicrobial agent.
6. The low-density lightweight foamed TPE material according to claim 1, wherein the preparation process comprises the following steps:
step 1: preparing raw materials of each component according to parts by weight;
step 2: uniformly mixing, and drying the materials at 60-80 ℃ for 1-2 hours;
and step 3: and (4) molding by using an injection molding machine, wherein the injection molding temperature is adjusted according to the required foaming temperature.
7. Use of the low density lightweight foamed TPE material of any one of claims 1-6 in the preparation of bra pads.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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