CN117863583A - Rubber-plastic foaming combination body, preparation method and application thereof - Google Patents
Rubber-plastic foaming combination body, preparation method and application thereof Download PDFInfo
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- CN117863583A CN117863583A CN202311647578.1A CN202311647578A CN117863583A CN 117863583 A CN117863583 A CN 117863583A CN 202311647578 A CN202311647578 A CN 202311647578A CN 117863583 A CN117863583 A CN 117863583A
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- 238000005520 cutting process Methods 0.000 claims abstract description 7
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- 230000003712 anti-aging effect Effects 0.000 claims description 15
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 12
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 claims description 12
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 11
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims description 11
- 229910052717 sulfur Inorganic materials 0.000 claims description 11
- 239000011593 sulfur Substances 0.000 claims description 11
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 11
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 9
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- 238000000748 compression moulding Methods 0.000 claims description 7
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- BUZICZZQJDLXJN-UHFFFAOYSA-N 3-azaniumyl-4-hydroxybutanoate Chemical compound OCC(N)CC(O)=O BUZICZZQJDLXJN-UHFFFAOYSA-N 0.000 claims description 6
- 229920002943 EPDM rubber Polymers 0.000 claims description 6
- 239000012190 activator Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- REQPQFUJGGOFQL-UHFFFAOYSA-N dimethylcarbamothioyl n,n-dimethylcarbamodithioate Chemical compound CN(C)C(=S)SC(=S)N(C)C REQPQFUJGGOFQL-UHFFFAOYSA-N 0.000 claims description 6
- AUZONCFQVSMFAP-UHFFFAOYSA-N disulfiram Chemical compound CCN(CC)C(=S)SSC(=S)N(CC)CC AUZONCFQVSMFAP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004049 embossing Methods 0.000 claims description 6
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Abstract
The invention relates to the technical field of rubber-plastic foaming combination, in particular to a rubber-plastic foaming combination, a preparation method and application thereof, wherein the preparation method comprises the steps of banburying rubber raw material mixture by an internal mixer, vulcanizing in a vulcanizing tank to form semi-vulcanized mixture, tabletting and cutting the semi-vulcanized mixture, hot-pressing and vulcanizing and shaping the semi-vulcanized mixture and a formed foaming elastomer in a pressing mold, and simultaneously, the hot-pressing process can be pressed with the formed foaming elastomer into an integrated structure, thereby being beneficial to avoiding the foaming effect of the foaming elastomer material in the pressing mold due to the influence of rubber, avoiding the increase of cost and the reduction of processing efficiency due to the bonding by an adhesive, and being easy to degumm; the obtained rubber-plastic foaming combination is beneficial to achieving the effects of light overall weight, comfort and shock absorption, strong binding force, wear resistance, skid resistance and tearing resistance of the rubber at the bottom.
Description
Technical Field
The invention relates to the technical field of rubber-plastic foaming combined bodies, in particular to a rubber-plastic foaming combined body, a preparation method and application thereof.
Background
The Rubber (Rubber) is a high-elasticity polymer material with reversible deformation, is elastic at room temperature, can generate larger deformation under the action of small external force, and can recover the original shape after the external force is removed. Rubber is classified into natural rubber and synthetic rubber. The rubber has better wear resistance. In some application scenarios, rubber is used as sole material, is capable of withstanding multiple bending, stretching, compression without being damaged, and has high wear resistance. Meanwhile, the rubber also has the characteristics of water impermeability, air impermeability, acid and alkali resistance, excellent insulation, high adhesive strength and the like. Rubber is a completely amorphous polymer with a low glass transition temperature (Tg), often with a large molecular weight, greater than several hundred thousand. However, the rubber has a high density, which is a disadvantage in that it causes more discomfort to the user for applications such as soles that require weight reduction.
The foamed elastomer is made into a light and high-elasticity molded product through a foaming process, so that the weight of the sole can be effectively reduced, the buffering and shock resistance performance can be improved, and the comfort and durability of the shoe can be improved.
Therefore, the combination of the foaming elastomer and the rubber is applied to the sole, which is not only beneficial to wear resistance of the sole, but also can reduce the weight of the sole and is beneficial to improving the comfort level.
However, the traditional way of combining foamed elastomers and rubber is: the rubber material is required to be added into a special die to be directly pressed and vulcanized to form the sole clinker with lines, burrs exist on the sole clinker after discharging, manual trimming is required, and the trimming efficiency is low; after the elastomer material is subjected to small foaming and mould pressing in a special mould, the sole clinker and the small foaming elastomer material are bonded through an adhesive and are foamed in a foaming and pressing mould and pressed simultaneously, however, the rubber is overflowed in the foaming and pressing process, the adhesive is additionally adopted, the cost is high, the processing efficiency is low, the service life of the adhesive is short, the rubber is easy to come off between the foaming elastomer and the rubber, more serious, the air hole of the foaming and pressing mould is easy to be blocked due to the fact that the rubber is bonded to the foaming and pressing mould in the pressing process, the foaming and forming effect of the small foaming elastomer is poor, if the foaming time is prolonged, the rubber is easy to age and overflow, even the physical property of the rubber is influenced, and the product quality is influenced.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, one of the purposes of the invention is to provide a preparation method of a rubber-plastic foaming combination body, which is characterized in that an internal mixer is utilized to banburying a rubber raw material mixture, then vulcanization is carried out in a vulcanizing tank to form a semi-vulcanized mixture, the semi-vulcanized mixture is pressed into slices and cut and then hot pressed with a formed foaming elastomer in a pressing mold for vulcanization and shaping, and meanwhile, the hot pressing process can be pressed with the formed foaming elastomer into an integrated structure, thereby being beneficial to avoiding the problem that the foaming effect of the elastomer material in the pressing mold is poor due to the influence of rubber, avoiding the increase of cost due to the adoption of adhesive bonding, reducing the processing efficiency and easy degumming, and avoiding the problems of ageing, color overflow and physical property reduction of the rubber; the preparation method has the advantages of simple operation, convenient control, high production efficiency and low production cost, and can be used for large-scale production.
The second purpose of the invention is to provide a rubber-plastic foaming combination body which is beneficial to achieving the effects of light overall weight, comfort shock absorption, strong binding force, wear resistance, skid resistance and tearing resistance of the rubber at the bottom.
The invention further aims to provide application of the rubber-plastic foaming combination body, wherein the rubber-plastic foaming combination body is applied to shoes as a wear-resistant elastic sole, so that the wear-resistant and anti-slip sole is facilitated, the weight of the sole can be reduced, and the comfort level is improved.
One of the purposes of the invention is realized by the following technical scheme: a preparation method of a rubber-plastic foaming combination body comprises the following steps:
(S1) taking a rubber raw material mixture and a formed foaming elastomer for standby;
(S2) adding the rubber raw material mixture into an internal mixer, and mixing for 10-20min at the temperature of 110-125 ℃ to obtain a rubber mixed material;
(S3) adding the rubber raw material mixture into a vulcanizing tank, and vulcanizing at the normal pressure at the temperature of 110-125 ℃ for 50-70min to form a semi-vulcanized mixture;
(S4) pressing the semi-vulcanized mixture into a sheet, and then, roughening, cutting and forming to obtain a rubber semi-finished product;
(S5) placing the formed foaming elastomer in a pressing mold, placing the rubber semi-finished product on the surface of the formed foaming elastomer, performing compression molding treatment for 2-5min at the temperature of 150-160 ℃ through the pressing mold, performing secondary vulcanization and embossing shaping on the rubber semi-finished product, simultaneously pressing the rubber semi-finished product and the formed foaming elastomer into an integrated structure, and cooling for 3-5min to obtain the rubber-plastic foaming combination body.
According to the preparation method of the rubber-plastic foaming combination body, the rubber raw material mixture is banburying and then vulcanized in the vulcanizing tank to form the semi-vulcanized mixture, the semi-vulcanized mixture is pressed into slices and cut and then hot-pressed, vulcanized and shaped with the shaped foaming elastomer in the pressing mold, and meanwhile, the hot-pressing process and the shaped foaming elastomer can be pressed into an integrated structure, so that the foaming effect is poor due to the fact that the foaming of the elastomer material in the pressing mold is influenced by rubber, the cost is increased due to the fact that the adhesive is used for bonding is avoided, the processing efficiency is reduced, and the rubber-plastic foaming combination body is easy to deglue. Wherein, step (S2) is to put the rubber raw material mixture into the vulcanizing tank of step (S3) for normal pressure vulcanization after banburying, so that certain vulcanization crosslinking is obtained, and at the moment, the physical properties of the rubber are basically stable, but still certain plasticity and workability are realized; and in the step (S4), the rubber semi-finished product is pressed and interacted with the formed foaming elastomer at a high temperature of 150-160 ℃ in the step (S5), the roughened surface of the rubber semi-finished product is mutually embedded with the surface of the formed foaming elastomer at a high temperature, the thermoplastic active ingredient of the rubber semi-finished product is melted and bonded with the formed foaming elastomer at the high temperature, the bonding strength of the rubber and the formed foaming elastomer is further improved, and meanwhile, the rubber is vulcanized and shaped under the high temperature and molding conditions, so that the foaming effect is poor due to the fact that the foaming of the elastomer material in a pressing die is influenced by the rubber, the cost is increased, the processing efficiency is reduced, the rubber is easy to come off due to the fact that the adhesive is bonded, and the problems of aging, color overflow and physical property drop of the rubber are solved.
Preferably, the formed foaming elastomer is EVA foaming body, foaming thermoplastic polyurethane elastomer ETPU or POE foaming body.
More preferably, the density of the molded foam elastomer is 0.05 to 0.3g/cm 3 The elastic modulus is 10-100MPa, and the compression set is less than 30%.
By adopting the technical scheme, the formed foaming elastomer is foamed and formed by using the EVA thermoplastic polyurethane elastomer or POE as a main raw material, the density after foaming is lighter, the foam has good rebound supporting property, damping comfort, impact resistance and chemical resistance, and the problem that the elastomer cannot be fully foamed due to the obstruction of rubber compactness in the step (S5) is radically solved.
Preferably, the rubber raw material mixture comprises the following raw materials in parts by weight:
the technical scheme is adopted, the rubber raw material mixture is specially suitable for the preparation method of the rubber-plastic foaming combination body, the mixed rubber is used as a main material, so that the basic wear-resistant anti-skid and anti-tearing effects of the rubber are achieved, the added thermoplastic rubber elastomer, vulcanizing agent, vulcanization accelerator, activating agent, anti-aging agent, sulfonated lignin and carbon black are cooperated in the preparation process of the rubber-plastic foaming combination body, the mixed rubber raw material mixture after banburying is vulcanized for 50-70min under normal pressure at the temperature of the thermoplastic rubber elastomer, vulcanizing agent, vulcanization accelerator and activating agent and 110-125 ℃ under the condition of vulcanization, the mixed rubber is in a semi-vulcanized state under the constraint of the vulcanization condition, the semi-vulcanized mixed rubber is formed, the basically stable rubber physical properties are achieved, meanwhile, the plasticity and the processability are still achieved, so that the rubber semi-finished product after roughening is pressed and interacted with the formed foaming elastomer at the high temperature of 150-160 ℃, the rough surface of the rubber semi-finished product is jogged with the surface of the formed foaming elastomer at the high temperature, the thermoplastic rubber elastomer is easy to melt and bond with the foaming elastomer at the high temperature, the foaming elastomer at the low temperature, the bonding efficiency is further improved, the foaming adhesive is reduced, the poor in the adhesive bonding effect and the foaming performance is further influenced by the foaming adhesive is avoided, the adhesive is further avoided, and the poor adhesive bonding effect is avoided in the foaming and the foaming condition is also is beneficial to be influenced by the foaming and the bonding effect is reduced; in addition, after the rubber is vulcanized and embossed for the second time, the sulfonated lignin reinforces the rubber, improves the tearing resistance, wear resistance and processability of the rubber, and simultaneously forms good combination with the carbon black, so that the carbon black is dispersed in the rubber more uniformly, and the wear resistance of the rubber is further improved.
Preferably, the mixed rubber is solution polymerized styrene-butadiene rubber, natural rubber and ethylene propylene diene monomer rubber in a weight ratio of 10-20:30-40:10-20:10-20.
By adopting the technical scheme, the four components act cooperatively, so that the wear resistance, the skid resistance, the wet skid resistance, the tearing resistance and the aging resistance of the rubber are improved.
Preferably, the thermoplastic rubber elastomer is a TPU elastomer and/or a SIS elastomer.
By adopting the technical scheme, the thermoplastic elastomer and the thermoplastic elastomer have excellent thermoplastic processability and are matched and applied to the rubber raw material mixture, and the step (S5) melts the surface of the thermoplastic rubber elastomer of the rubber semi-finished product at high temperature and adheres to the formed foaming elastomer; more preferably, the thermoplastic rubber elastomer is formed by mixing a TPU elastomer and an SIS elastomer according to a weight ratio of 2:1, the added TPU elastomer further improves the tensile strength and the wear resistance of the rubber, and the SIS elastomer plays a great role in promoting the adhesion between the rubber and the molded foam elastomer.
Preferably, the vulcanizing agent is formed by mixing sulfur and di-tert-butyl peroxide according to the weight ratio of 1:0.8-1.5; the vulcanization accelerator is at least one of tetramethyl thiuram disulfide TMTD, tetramethyl thiuram monosulfide TMTM, tetraethyl thiuram disulfide TETD or pentamethylene thiuram hexasulfide DPTT.
According to the technical scheme, the vulcanizing agent is formed by mixing sulfur and di-tert-butyl peroxide according to the weight ratio of 1:0.8-1.5, in the normal pressure vulcanization process of the vulcanizing tank, only sulfur plays a role in vulcanization and reacts with rubber molecules under the influence of normal pressure and lower temperature to form a crosslinked network structure, a semi-vulcanized mixture is formed, and then secondary vulcanization is carried out at high temperature in the compression molding process of the compression mold, at the moment, the sulfur and the di-tert-butyl peroxide play a role in vulcanization at the same time, and the di-tert-butyl peroxide is decomposed under the high temperature and the pressure condition to generate free radicals, so that the rubber crosslinking reaction is initiated, and the vulcanization molding of rubber is promoted. The vulcanization accelerator can accelerate the vulcanization of rubber, shorten the vulcanization time of rubber and improve the production efficiency.
Preferably, the activator is at least one of zinc oxide, potassium disulfide or di-tert-butanoyl peroxide; the anti-aging agent is an anti-aging agent MB or an anti-aging agent NS-6.
The second purpose of the invention is realized by the following technical scheme: a rubber-plastic foaming combination body is prepared by adopting the preparation method of the rubber-plastic foaming combination body.
The third object of the invention is achieved by the following technical scheme: the application of the rubber-plastic foaming combination body is that the rubber-plastic foaming combination body is used as wear-resistant elastic sole and applied to shoes.
The invention has the beneficial effects that: according to the preparation method of the rubber-plastic foaming combination body, the rubber raw material mixture is banburying and then vulcanized in the vulcanizing tank to form the semi-vulcanized mixture, the semi-vulcanized mixture is pressed and cut and then hot-pressed, vulcanized and shaped with the shaped foaming elastomer in the pressing mold, and meanwhile, the hot-pressing process and the shaped foaming elastomer can be pressed into an integrated structure, so that the foaming effect is poor due to the fact that the elastomer material is foamed in the pressing mold under the influence of rubber, the cost is increased due to the fact that the adhesive is used for bonding is avoided, the processing efficiency is reduced, degumming is easy to occur, and the problems of ageing, color overflow and physical property reduction of the rubber are avoided; the preparation method has the advantages of simple operation, convenient control, high production efficiency and low production cost, and can be used for large-scale production.
The rubber-plastic foaming combination body is beneficial to achieving the effects of light overall weight, comfort, shock absorption, strong binding force, wear resistance, skid resistance and tearing resistance of the rubber at the bottom.
The application of the rubber-plastic foaming combination body disclosed by the invention is that the rubber-plastic foaming combination body is applied to shoes as a wear-resistant elastic sole, so that the wear resistance and the skid resistance of the sole are facilitated, the weight of the sole can be reduced, and the comfort level is improved.
Detailed Description
The invention will be further illustrated by the following examples, which are not intended to limit the scope of the invention, in order to facilitate the understanding of those skilled in the art.
Example 1
A preparation method of a rubber-plastic foaming combination body comprises the following steps:
(S1) taking a rubber raw material mixture and a formed foaming elastomer for standby;
(S2) adding the rubber raw material mixture into an internal mixer, and mixing for 15min at 120 ℃ to obtain a rubber mixed material;
(S3) adding the rubber raw material mixture into a vulcanizing tank, and vulcanizing at the normal pressure at 120 ℃ for 60 minutes to form a semi-vulcanized mixture;
(S4) pressing the semi-vulcanized mixture into a sheet, and then, roughening, cutting and forming to obtain a rubber semi-finished product;
(S5) placing the formed foaming elastomer in a pressing mold, placing the rubber semi-finished product on the surface of the formed foaming elastomer, performing compression molding at 155 ℃ for 15MPa for 3min by the pressing mold, performing secondary vulcanization and embossing shaping on the rubber semi-finished product, and simultaneously pressing the rubber semi-finished product and the formed foaming elastomer into an integrated structure, and cooling for 4min to obtain the rubber-plastic foaming combination body.
The formed foaming elastomer is EVA foaming body.
The density of the formed foaming elastomer is 0.25g/cm 3 The elastic modulus is 30MPa, and the compression set is less than 30%.
The rubber raw material mixture comprises the following raw materials in parts by weight:
the mixed rubber is solution polymerized styrene-butadiene rubber, natural rubber and ethylene propylene diene monomer rubber according to the weight ratio of 15:35:15:15.
the thermoplastic rubber elastomer is formed by mixing TPU elastomer and SIS elastomer according to a weight ratio of 2:1.
The vulcanizing agent is formed by mixing sulfur and di-tert-butyl peroxide according to the weight ratio of 1:1; the vulcanization accelerator is formed by mixing tetramethyl thiuram disulfide TMTD and tetramethyl thiuram monosulfide TMTM according to a weight ratio of 1:1.
The activator is zinc oxide; the anti-aging agent is an anti-aging agent MB.
The rubber-plastic foaming combination body is used as a wear-resistant elastic sole and applied to shoes.
Example 2
A preparation method of a rubber-plastic foaming combination body comprises the following steps:
(S1) taking a rubber raw material mixture and a formed foaming elastomer for standby;
(S2) adding the rubber raw material mixture into an internal mixer, and mixing for 20min at the temperature of 110 ℃ to obtain a rubber mixed material;
(S3) adding the rubber raw material mixture into a vulcanizing tank, and vulcanizing at the temperature of 110 ℃ under normal pressure for 70 minutes to form a semi-vulcanized mixture;
(S4) pressing the semi-vulcanized mixture into a sheet, and then, roughening, cutting and forming to obtain a rubber semi-finished product;
(S5) placing the formed foaming elastomer in a pressing mold, placing the rubber semi-finished product on the surface of the formed foaming elastomer, performing compression molding at the temperature of 150 ℃ for 20MPa for 5min by the pressing mold, performing secondary vulcanization and embossing shaping on the rubber semi-finished product, and simultaneously pressing the rubber semi-finished product and the formed foaming elastomer into an integrated structure, and cooling for 5min to obtain the rubber-plastic foaming combination body.
The formed foaming elastomer is EVA foaming body.
The density of the formed foaming elastomer is 0.25g/cm 3 The elastic modulus is 30MPa, and the compression set is less than 30%.
The rubber raw material mixture comprises the following raw materials in parts by weight:
the mixed rubber is solution polymerized styrene-butadiene rubber, natural rubber and ethylene propylene diene monomer rubber according to the weight ratio of 10:30:10:10.
the thermoplastic rubber elastomer is formed by mixing TPU elastomer and SIS elastomer according to a weight ratio of 2:1.
The vulcanizing agent is formed by mixing sulfur and di-tert-butyl peroxide according to the weight ratio of 1:0.8; the vulcanization accelerator is formed by mixing tetramethyl thiuram disulfide TMTD and tetramethyl thiuram monosulfide TMTM according to a weight ratio of 1:1.
The activator is zinc oxide; the anti-aging agent is an anti-aging agent MB.
The rubber-plastic foaming combination body is used as a wear-resistant elastic sole and applied to shoes.
Example 3
A preparation method of a rubber-plastic foaming combination body comprises the following steps:
(S1) taking a rubber raw material mixture and a formed foaming elastomer for standby;
(S2) adding the rubber raw material mixture into an internal mixer, and mixing for 10min at the temperature of 125 ℃ to obtain a rubber mixed material;
(S3) adding the rubber raw material mixture into a vulcanizing tank, and vulcanizing at the temperature of 125 ℃ under normal pressure for 50min to form a semi-vulcanized mixture;
(S4) pressing the semi-vulcanized mixture into a sheet, and then, roughening, cutting and forming to obtain a rubber semi-finished product;
(S5) placing the formed foaming elastomer in a pressing mold, placing the rubber semi-finished product on the surface of the formed foaming elastomer, performing compression molding at 160 ℃ for 10MPa for 2min by the pressing mold, performing secondary vulcanization and embossing shaping on the rubber semi-finished product, and simultaneously pressing the rubber semi-finished product and the formed foaming elastomer into an integrated structure, and cooling for 3min to obtain the rubber-plastic foaming combination body.
The formed foaming elastomer is EVA foaming body.
The density of the formed foaming elastomer is 0.25g/cm 3 The elastic modulus is 30MPa, and the compression set is less than 30%.
The rubber raw material mixture comprises the following raw materials in parts by weight:
the mixed rubber is solution polymerized styrene-butadiene rubber, natural rubber and ethylene propylene diene monomer rubber according to the weight ratio of 20:40:20:20.
the thermoplastic rubber elastomer is formed by mixing TPU elastomer and SIS elastomer according to a weight ratio of 2:1.
The vulcanizing agent is formed by mixing sulfur and di-tert-butyl peroxide according to the weight ratio of 1:1.5; the vulcanization accelerator is formed by mixing tetramethyl thiuram disulfide TMTD and tetramethyl thiuram monosulfide TMTM according to a weight ratio of 1:1.
The activator is zinc oxide; the anti-aging agent is an anti-aging agent MB.
The rubber-plastic foaming combination body is used as a wear-resistant elastic sole and applied to shoes.
Example 4
A preparation method of a rubber-plastic foaming combination body comprises the following steps:
(S1) taking a rubber raw material mixture and a formed foaming elastomer for standby;
(S2) adding the rubber raw material mixture into an internal mixer, and mixing for 18min at the temperature of 118 ℃ to obtain a rubber mixed material;
(S3) adding the rubber raw material mixture into a vulcanizing tank, and vulcanizing at 118 ℃ for 58 minutes under normal pressure to form a semi-vulcanized mixture;
(S4) pressing the semi-vulcanized mixture into a sheet, and then, roughening, cutting and forming to obtain a rubber semi-finished product;
(S5) placing the formed foaming elastomer in a pressing mold, placing the rubber semi-finished product on the surface of the formed foaming elastomer, performing compression molding at 158 ℃ for 18MPa for 4min by the pressing mold, performing secondary vulcanization and embossing shaping on the rubber semi-finished product, and simultaneously pressing the rubber semi-finished product and the formed foaming elastomer into an integrated structure, and cooling for 4min to obtain the rubber-plastic foaming combination body.
The formed foaming elastomer is EVA foaming body.
The density of the formed foaming elastomer is 0.25g/cm 3 The elastic modulus is 30MPa, and the compression set is less than 30%.
The rubber raw material mixture comprises the following raw materials in parts by weight:
the mixed rubber is solution polymerized styrene-butadiene rubber, natural rubber and ethylene propylene diene monomer rubber according to the weight ratio of 13:33:13:13.
the thermoplastic rubber elastomer is formed by mixing TPU elastomer and SIS elastomer according to a weight ratio of 2:1.
The vulcanizing agent is formed by mixing sulfur and di-tert-butyl peroxide according to the weight ratio of 1:1.3; the vulcanization accelerator is formed by mixing tetramethyl thiuram disulfide TMTD and tetramethyl thiuram monosulfide TMTM according to a weight ratio of 1:1.
The activator is zinc oxide; the anti-aging agent is an anti-aging agent MB.
The rubber-plastic foaming combination body is used as a wear-resistant elastic sole and applied to shoes.
Comparative example 1
The difference between this comparative example and example 1 is that:
in the rubber raw material mixture, the weight part of the mixed rubber is increased to 112 parts, and the weight part of the thermoplastic rubber elastomer is reduced to 0 part, namely the rubber raw material mixture does not contain the thermoplastic rubber elastomer.
Comparative example 2
The difference between this comparative example and example 1 is that:
the vulcanizing agent is sulfur.
Comparative example 3
The difference between this comparative example and example 1 is that:
in the rubber raw material mixture, the weight part of the mixed rubber is increased to 101.5 parts, and the weight part of the sulfonated lignin is reduced to 0 part, namely the rubber raw material mixture does not contain the sulfonated lignin.
Comparative example 4
The difference between this comparative example and example 1 is that:
in the rubber raw material mixture, the weight part of the mixed rubber is increased to 108 parts, and the weight part of the carbon black is reduced to 0 part, namely the rubber raw material mixture does not contain carbon black.
Comparative example 5
The difference between this comparative example and example 1 is that:
the thermoplastic rubber elastomer is styrene-butadiene-styrene block copolymer (SBS).
Performance testing
The rubber-plastic foaming combination of examples 1-4 and comparative examples 1-5 was tested for adhesive strength between rubber and foaming elastomer and abrasion resistance of rubber by the following test method:
adhesive strength test: taking the rubber-plastic foaming combination body to perform peeling test by using a tensile testing machine according to GB/T21396-2022 shoe forming test method for upper and lower adhesive strength, wherein the unit is N/mm;
rubber abrasion resistance test: according to the abrasion resistance of the general test method of GB/T3903.2-2008 shoes, rubber abrasion mark test is carried out, and the length of the abrasion mark is measured by a vernier caliper, wherein the unit is mm;
the test results are shown in table 1 below:
TABLE 1
As can be seen from the above Table 1, the specific preparation method adopted by the present invention is matched with the specific rubber raw material mixture to prepare the rubber-plastic foaming combination body, which has greatly improved adhesive strength between rubber and plastic and rubber wear resistance and unexpected technical effects. The addition of a specific thermoplastic rubber elastomer to the rubber raw material mixture of the present invention has an essential effect on improving the adhesive strength and abrasion resistance of the rubber-plastic foam bonded body, as compared with comparative example 1 and comparative example 5; compared with comparative example 2, the vulcanizing agent disclosed by the invention has a synergistic effect by mixing sulfur and di-tert-butyl peroxide according to a specific weight ratio and combining a specific preparation method, and plays an important role in rubber vulcanization of a rubber-plastic foaming combination body. Compared with comparative example 3 and comparative example 4, the sulfonated lignin and carbon black of the invention cooperate to enhance the abrasion resistance of rubber, and the abrasion resistance effect after compounding the sulfonated lignin and the carbon black is better, which is unexpected by the inventor.
The above embodiments are preferred embodiments of the present invention, and besides, the present invention may be implemented in other ways, and any obvious substitution is within the scope of the present invention without departing from the concept of the present invention.
Claims (10)
1. The preparation method of the rubber-plastic foaming combination is characterized by comprising the following steps:
(S1) taking a rubber raw material mixture and a formed foaming elastomer for standby;
(S2) adding the rubber raw material mixture into an internal mixer, and mixing for 10-20min at the temperature of 110-125 ℃ to obtain a rubber mixed material;
(S3) adding the rubber raw material mixture into a vulcanizing tank, and vulcanizing at the normal pressure at the temperature of 110-125 ℃ for 50-70min to form a semi-vulcanized mixture;
(S4) pressing the semi-vulcanized mixture into a sheet, and then, roughening, cutting and forming to obtain a rubber semi-finished product;
(S5) placing the formed foaming elastomer in a pressing mold, placing the rubber semi-finished product on the surface of the formed foaming elastomer, performing compression molding treatment for 2-5min at the temperature of 150-160 ℃ through the pressing mold, performing secondary vulcanization and embossing shaping on the rubber semi-finished product, simultaneously pressing the rubber semi-finished product and the formed foaming elastomer into an integrated structure, and cooling for 3-5min to obtain the rubber-plastic foaming combination body.
2. The method for preparing a rubber-plastic foaming combination according to claim 1, which is characterized in that: the formed foaming elastomer is EVA foaming body, foaming thermoplastic polyurethane elastomer ETPU or POE foaming body.
3. The method for preparing a rubber-plastic foaming combination according to claim 1, which is characterized in that: the density of the formed foaming elastomer is 0.05-0.3g/cm 3 The elastic modulus is 10-100MPa, and the compression set is less than 30%.
4. The method for preparing a rubber-plastic foaming combination according to claim 1, which is characterized in that: the rubber raw material mixture comprises the following raw materials in parts by weight:
5. the method for producing a rubber-plastic foam composite according to claim 4, wherein: the mixed rubber is solution polymerized styrene-butadiene rubber, natural rubber and ethylene propylene diene monomer rubber according to the weight ratio of 10-20:30-40:10-20:10-20.
6. The method for producing a rubber-plastic foam composite according to claim 4, wherein: the thermoplastic rubber elastomer is a TPU elastomer and/or an SIS elastomer.
7. The method for producing a rubber-plastic foam composite according to claim 4, wherein: the vulcanizing agent is formed by mixing sulfur and di-tert-butyl peroxide according to the weight ratio of 1:0.8-1.5; the vulcanization accelerator is at least one of tetramethyl thiuram disulfide TMTD, tetramethyl thiuram monosulfide TMTM, tetraethyl thiuram disulfide TETD or pentamethylene thiuram hexasulfide DPTT.
8. The method for producing a rubber-plastic foam composite according to claim 4, wherein: the activator is at least one of zinc oxide, potassium disulfide or di-tert-butanoyl peroxide; the anti-aging agent is an anti-aging agent MB or an anti-aging agent NS-6.
9. A rubber and plastic foaming combination is characterized in that: a process for producing a rubber-plastic foam composite according to any one of claims 1 to 8.
10. Use of a rubber-plastic foam combination as claimed in claim 9, characterized in that: the rubber-plastic foaming combination body is used as a wear-resistant elastic sole and applied to shoes.
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