Lightweight floating sole rubber and preparation method and application thereof

Abstract

The invention discloses light floating sole rubber as well as a preparation method and application thereof, and the light floating sole rubber is prepared from the following substances in percentage by mass: 24 to 26 percent of butadiene rubber, 13 to 16 percent of natural rubber, 7 to 10 percent of methyl styrene-olefin copolymer, 6 to 7 percent of butadiene styrene copolymer, 8 to 9 percent of fumed silica and 26 to 30 percent of styrene-butadiene segmented copolymer. The coating is prepared from the following components in percentage by weight: 3 to 4 percent of hollow glass beads, 2 to 3 percent of machine oil, 0.4 to 0.8 percent of active agent PEG (Polyethylene Glycol), 0.2 to 0.4 percent of antifogging agent, 0.3 to 0.4 percent of stearic acid, 1 to 1.5 percent of zinc oxide, 0.5 to 0.7 percent of wear-resistant oil and 1 to 1.5 percent of anti-aging agent. The hollow glass beads and the light rubber filler are added into the rubber formula, and the T3 gas phase method white smoke is used, so that the specific gravity of the rubber sole is effectively reduced, meanwhile, the physical property can meet the requirement, the weight reduction effect on an outsole with the weight of more than 300g per pair is obvious, and the heavier the sole is, the better the effect is.

Description

Technical Field

[0001] The invention belongs to the technical field of lightweight rubber, and in particular relates to a lightweight water-floating sole rubber and a preparation method and application thereof. Background Art

[0002] The main materials for producing soles are rubber, PU, ​​PVC, MD, TPR, TPU, EVA, etc. Rubber soles, with their advantages of anti-skid, high elasticity, good wear resistance, not easy to break, good ductility, stable shrinkage, etc., can be said to occupy half of the footwear products. At present, most of the finished shoes of domestic first-line brands are made of rubber soles. People spend at least one-third of their work time walking. At the same time, people like to exercise and release stress by running. For every 100 grams of shoe weight increase, physical energy consumption will increase by 1%. Therefore, many companies use PHYLON midsole or EVA midsole combined with rubber soles to reduce weight. Although the shock absorption, anti-skid and wear resistance are very good, the weight reduction effect is not obvious. Some companies use 3D soles formed by EVA one-time foaming, which can significantly reduce the weight of shoes, but its anti-skid and wear resistance are poor.

[0003] To evaluate whether the performance of the sole is superior, the sole's apparent density, tensile strength, elongation at break, wear resistance, etc. are mainly evaluated. The hardness of the sole is related to the wearing comfort of the shoe. Traditional sole formulas and production processes are based on the high, medium and low grades of customers, using different formulas, but none of them can solve the problem of reducing the weight of rubber soles. Many rubber engineers have conducted a lot of exploration and research on how to produce lightweight rubber soles, trying to produce rubber soles with low density. However, during research and development, it was found that the sole quality would be reduced while the physical properties of the sole could not be guaranteed. Therefore, it is necessary to improve the sole rubber material. Summary of the invention

[0004] In view of the deficiencies in the prior art, the invention provides a lightweight floating water sole rubber, which comprises the following material compositions in percentage by mass: 24-26% of butadiene rubber, 13-16% of natural rubber, 7-10% of methylstyrene-olefin copolymer, 6-7% of butadiene-styrene copolymer, 8-9% of fumed silica, 26-30% of styrene-butadiene block copolymer, 3-4% of hollow glass microspheres, 2-3% of machine oil, 0.4-0.8% of active agent PEG, 0.2-0.4% of antifogging agent, 0.3-0.4% of stearic acid, 1-1.5% of zinc oxide, 0.5-0.7% of wear-resistant oil and 1-1.5% of antioxidant.

[0005] Preferably, the hardness of the butadiene rubber is 55-60A.

[0006] Preferably, its density is 0.90-0.96 g / cm3 .

[0007] The density of conventional rubber is generally 1.2g / cm 3 The sole density of the lightweight rubber of the present invention is much lower than that of conventional rubber. The sole prepared by the lightweight rubber of the present invention is light and comfortable.

[0008] The present invention also provides a method for preparing a lightweight water-floating sole rubber, which mainly comprises the following steps:

[0009] (1) Weighing: weigh all raw materials according to mass percentage;

[0010] (2) Banburying: Mix the raw materials accurately weighed, start banburying, mix the materials butadiene rubber, natural rubber, methyl styrene-olefin copolymer, butadiene styrene copolymer evenly, add 2 / 3 of fumed silica and styrene-butadiene block copolymer, continue banburying, mix the rubber, silica, and styrene-butadiene block copolymer, and re-agglomerate. When the temperature reaches 105-107°C, add all the remaining raw materials and the remaining silica, and when the temperature continues to rise to 125°C, the mixture of all the raw materials agglomerates again, and the banburying rubber is obtained;

[0011] (3) Open refining and sulfur addition: the rubber material prepared by the internal mixing in step (2) is open-refined to discharge the material in the form of flakes; the flakes discharged from the open refining are placed in a dry place for static treatment according to the proportion, and the open refining mill is used for sulfur addition: the flakes are firstly triangularly packaged in the open refining mill for the first and second times, and then triangularly packaged for the third time, leaving a deposited rubber above the roller spacing, and sulfur and accelerator are simultaneously added to the deposited rubber, followed by tamping and mixing, and the open refining method is changed to triangular packaging and rolling method. After uniform mixing, the material is discharged to obtain the material after sulfur addition;

[0012] (4) Measure the vulcanization curve: Cut a small piece of the material after vulcanization in step (3), measure the vulcanization curve with a vulcanometer, record the scorch time and the positive vulcanization time, and adjust them to the acceptable range.

[0013] Preferably, the qualified range in step (4) is that the scorch time is 2 minutes and 20 seconds ± 10 seconds, and the positive vulcanization time is 4 minutes ± 20 seconds.

[0014] The present invention also provides application of the lightweight water-floating shoe sole rubber prepared by using the lightweight water-floating shoe sole rubber as a rubber sole.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The present invention effectively reduces the specific gravity of the rubber sole by adding hollow glass microspheres and lightweight rubber fillers into the rubber formula and using T3 gas phase white smoke, while the physical properties can meet the requirements. For outsoles weighing more than 300g per pair, the weight reduction effect is obvious, and the heavier the sole, the better the effect.

[0017] The lightweight floating sole rubber prepared by the present invention is compared with the common SR-60 formula. The various technical indicators are shown in Table 1 below:

[0018] Table 1

[0019] DETAILED DESCRIPTION

[0020] The technical solution of the present invention is clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1

[0022] A lightweight floating sole rubber comprises the following materials in percentage by mass: 25% of butadiene rubber, 14.5% of natural rubber, 8.5% of methylstyrene-olefin copolymer, 6.5% of butadiene-styrene copolymer, 8.2% of fumed silica, 28% of styrene-butadiene block copolymer, 3.1% of hollow glass microspheres, 2% of machine oil, 0.6% of active agent PEG, 0.3% of antifogging agent, 0.3% of stearic acid, 1.2% of zinc oxide, 0.6% of wear-resistant oil and 1.2% of antioxidant.

[0023] Example 2

[0024] A lightweight floating sole rubber comprises the following materials in percentage by mass: 24% of butadiene rubber, 13% of natural rubber, 10% of methylstyrene-olefin copolymer, 7% of butadiene-styrene copolymer, 8% of fumed silica, 28% of styrene-butadiene block copolymer, 4% of hollow glass microspheres, 2% of machine oil, 0.5% of active agent PEG, 0.3% of antifogging agent, 0.3% of stearic acid, 1% of zinc oxide, 0.7% of wear-resistant oil and 1.2% of antioxidant.

[0025] Example 3

[0026] A lightweight floating sole rubber comprises the following materials in percentage by mass: 25% of butadiene rubber, 13% of natural rubber, 9% of methylstyrene-olefin copolymer, 7% of butadiene-styrene copolymer, 8% of fumed silica, 28.5% of styrene-butadiene block copolymer, 3% of hollow glass microspheres, 2% of machine oil, 0.8% of active agent PEG, 0.4% of antifogging agent, 0.3% of stearic acid, 1% of zinc oxide, 0.7% of wear-resistant oil and 1.3% of antioxidant.

[0027] Example 4

[0028] A lightweight floating sole rubber, characterized in that it comprises the following material compositions in percentage by mass: 24% butadiene rubber, 16% natural rubber, 8% methylstyrene-olefin copolymer, 6% butadiene-styrene copolymer, 8% fumed silica, 28% styrene-butadiene block copolymer, 3% hollow glass microspheres, 2.5% machine oil, 0.5% active agent PEG, 0.3% antifogging agent, 0.3% stearic acid, 1.4% zinc oxide, 0.6% wear-resistant oil, and 1.4% antioxidant.

[0029] The raw materials of the above embodiments 1-4 are used to prepare the lightweight floating water sole rubber, which mainly includes the following steps:

[0030] (1) Weighing: weigh all raw materials according to mass percentage;

[0031] (2) Banburying: Mix the raw materials accurately weighed, start banburying, mix the materials butadiene rubber, natural rubber, methyl styrene-olefin copolymer, butadiene styrene copolymer evenly, add 2 / 3 of fumed silica and styrene-butadiene block copolymer, continue banburying, mix the rubber, silica, and styrene-butadiene block copolymer, and re-agglomerate. When the temperature reaches 105-107°C, add all the remaining raw materials and the remaining silica, and when the temperature continues to rise to 125°C, the mixture of all the raw materials agglomerates again, and the banburying rubber is obtained;

[0032] (3) Open refining and sulfur addition: the rubber material prepared by the internal mixing in step (2) is open-refined to discharge the material in the form of flakes; the flakes discharged from the open refining are placed in a dry place for static treatment according to the proportion, and the open refining mill is used for sulfur addition: the flakes are firstly triangularly packaged in the open refining mill for the first and second times, and then triangularly packaged for the third time, leaving a deposited rubber above the roller spacing, and sulfur and accelerator are simultaneously added to the deposited rubber, followed by tamping and mixing, and the open refining method is changed to triangular packaging and rolling method. After uniform mixing, the material is discharged to obtain the material after sulfur addition;

[0033] (4) Measure the vulcanization curve: Cut a small piece of the material after vulcanization in step (3), measure the vulcanization curve with a vulcanometer, record the scorch time and the positive vulcanization time, and adjust them to the acceptable range.

[0034] The specific gravity of the lightweight floating sole rubber prepared in the above embodiment and the rubber prepared by the common formula SR-60 were tested, and the results are shown in Table 2 below:

[0035] Table 2

[0036] formula proportion Lightweight floating rubber sole ≤0.96 Ordinary formula SR-60 1.05-1.19

[0037] The above two formulas were prepared into rubber outsoles NBWL520 and CSLB-425 and tested, and the results are shown in Tables 3 and 4 below;

[0038] Table 3

[0039] Rubber outsole NBWL520 proportion Weight (g / pair) Weight difference Price (USD / pair) Spread Lightweight water-floating sole rubber formula ≤0.96 151.6 -24.2 1.23 0.06 Regular SR-60 formula 1.11±0.03 175.8 1.17

[0040] Table 4

[0041] Rubber outsole CSLB-425 proportion Weight (g / pair) Weight difference Price (USD / pair) Spread Lightweight water-floating sole rubber formula ≤0.96 559.78 -114.06 3.29 0.66 Regular SR-60 formula 1.11±0.03 673.84 2.63

[0042] It can be seen from Table 3 and Table 4 that the lightweight floating sole rubber prepared by the method of the present invention has an obvious weight reduction effect, and the heavier the sole, the better the effect.

[0043] The above descriptions are merely embodiments of the present invention. It should be pointed out that, for those skilled in the art, various changes, modifications, substitutions and variations can be made to these embodiments without departing from the technical principles of the present invention. These changes, modifications, substitutions and variations should also be regarded as the scope of protection of the present invention.

Claims

1. A lightweight floating water sole rubber, characterized in that: The material composition includes the following mass percentages: 24-26% of butadiene rubber, 13-16% of natural rubber, 7-10% of methylstyrene-olefin copolymer, 6-7% of butadiene-styrene copolymer, 8-9% of fumed silica, 26-30% of styrene-butadiene block copolymer, 3-4% of hollow glass microspheres, 2-3% of machine oil, 0.4-0.8% of active agent PEG, 0.2-0.4% of antifogging agent, 0.3-0.4% of stearic acid, 1-1.5% of zinc oxide, 0.5-0.7% of wear-resistant oil and 1-1.5% of antioxidant.

2. A lightweight water-floating sole rubber according to claim 1, characterized in that: The hardness of the butadiene rubber is 55-60A.

3. The lightweight water-floating sole rubber according to claim 1 or 2, characterized in that: Its density is 0.90-0.96g / cm³.

4. The method for preparing the lightweight floating water sole rubber according to any one of claims 1 to 3, characterized in that: The main steps are as follows: (1) Weighing: weigh all raw materials according to mass percentage; (2) Banburying: Mix the raw materials accurately weighed, start the banburying process, mix the materials butadiene rubber, natural rubber, methyl styrene-olefin copolymer, butadiene styrene copolymer evenly, add 2 / 3 of the amount of fumed silica and styrene-butadiene block copolymer, continue banburying, mix the rubber, silica, and styrene-butadiene block copolymer, and re-agglomerate. When the temperature reaches 105-107°C, add all the remaining raw materials and the remaining silica, and when the temperature continues to rise to 125°C, the mixture of all the raw materials agglomerates again, and the banburying rubber is obtained; (3) Open refining and vulcanization: the rubber material prepared by the internal mixing in step (2) is open-refined to discharge the material in the form of flakes; the flakes discharged from the open refining are placed in a dry place for static treatment according to the proportion, and the open refining mill is used for vulcanization: the flakes are firstly triangularly packaged in the open refining mill for the first and second times, and then triangularly packaged for the third time, leaving a deposited rubber above the roller spacing, and sulfur and accelerator are simultaneously added to the deposited rubber, followed by tamping and mixing, and the open refining method is changed to triangular packaging and rolling method. After uniform mixing, the material is discharged to obtain the vulcanized material; (4) Measure the vulcanization curve: Cut a small piece of the material after vulcanization in step (3), measure the vulcanization curve with a vulcanometer, record the scorch time and the positive vulcanization time, and adjust them to the acceptable range.

5. The method for preparing the lightweight floating water sole rubber according to claim 4, characterized in that: The qualified range in step (4) is that the scorch time is 2 minutes and 20 seconds ± 10 seconds, and the positive vulcanization time is 4 minutes ± 20 seconds.

6. Use of the lightweight water-floating sole rubber according to any one of claims 1 to 3 or the lightweight water-floating sole rubber prepared by the method for preparing the lightweight water-floating sole rubber according to any one of claims 4 to 5 as a rubber sole.

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