CN111440361A - Light rubber boot vamp compound rubber material - Google Patents
Light rubber boot vamp compound rubber material Download PDFInfo
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- CN111440361A CN111440361A CN202010384060.3A CN202010384060A CN111440361A CN 111440361 A CN111440361 A CN 111440361A CN 202010384060 A CN202010384060 A CN 202010384060A CN 111440361 A CN111440361 A CN 111440361A
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- rubber
- hollow glass
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- carbon black
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B1/00—Footwear characterised by the material
- A43B1/10—Footwear characterised by the material made of rubber
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a light rubber boot vamp rubber compound, which comprises the raw materials of natural rubber, high styrene rubber, thermoplastic styrene-butadiene rubber, sulfur, stearic acid, active zinc oxide, an anti-aging agent MB, an anti-aging agent 264, light white carbon black, hollow glass beads and phenolic resin, wherein the specific gravity of the light white carbon black is 1.2-1.5, and the specific gravity of the hollow glass beads is 0.18-0.21; has the characteristics of high glue content and light specific gravity, and the tensile strength is more than or equal to 14 Ma; the elongation is more than or equal to 500 percent, the rubber material is used for special protective rubber boots (such as various industrial and mining boots), the weight of each original protective rubber boot with double weight of 2.4Kg-3.4Kg can be successfully reduced to about 2.2-3.1Kg, the weight reduction is very obvious for miners with large daily walking amount and workload, the rolling shrinkage of the protective boots is reduced, the patterns are clear, the boot surface is good in stiffness under the conditions of high rubber content and low reinforcing agent consumption, and the problems of large rolling shrinkage, unclear patterns, poor boot surface stiffness and the like caused by low consumption of the reinforcing agent, the reinforcing agent and the like are solved.
Description
Technical Field
The invention relates to the field of rubber boot materials, in particular to a light rubber boot vamp compound rubber material.
Background
The existing boots generally have the problem of heavy weight and are inconvenient to wear. For example, the specific gravity of the boot surface of the traditional hot vulcanization rubber boot is generally about 1.30-1.40, the whole pair of rubber boots is heavy, the specific gravity of the whole pair of rubber boots is generally 1000 g-3500 g/pair from the common rubber boots to the special protective rubber boots, and particularly, the consumption of rubber materials on the boot surface is more than 1.2 kg per pair of the special protective rubber boots (such as heavy industrial and mining boots), so that certain influence is caused on the protection operation. The foamed rubber has lighter performance than non-foamed rubber, and the existing rubber has lighter weight after being foamed, but has unsatisfactory mechanical properties, can only be used for rain boot materials with lower requirements on service performance, and has limited service life.
Disclosure of Invention
In view of the above, the invention aims to provide a rubber compound for a boot vamp of a lightweight rubber boot, which can achieve the purpose of reducing the weight of the rubber boot by remarkably reducing the specific gravity of the rubber compound.
The invention relates to a light rubber boot vamp compound rubber material which comprises the following raw materials in parts by weight: 70-90 parts of natural rubber, 5-10 parts of high styrene rubber, 5-10 parts of thermoplastic styrene-butadiene rubber, 1.5-2.5 parts of sulfur, 1.0-2.0 parts of stearic acid, 2-4 parts of active zinc oxide, 0.8-1.5 parts of an anti-aging agent MB, 0.8-1.5 parts of an anti-aging agent 264, 20-40 parts of light white carbon black, 25-45 parts of hollow glass microspheres, 2-8 parts of phenolic resin, 0.8-1.5 parts of a promoter DM and 0.4-0.8 part of a promoter D; the specific gravity of the light white carbon black is 1.2-1.5, and the specific gravity of the hollow glass beads is 0.18-0.21;
further, the sizing material comprises the following components in parts by weight: 75-85 parts of natural rubber, 8-10 parts of high styrene rubber, 8-10 parts of thermoplastic styrene-butadiene rubber, 1.8-2.2 parts of sulfur, 1.3-1.7 parts of stearic acid, 2-3 parts of active zinc oxide, 0.8-1.2 parts of an anti-aging agent MB, 0.8-1.2 parts of an anti-aging agent 264, 20-30 parts of light white carbon black, 25-35 parts of hollow glass microspheres, 4-6 parts of phenolic resin, 0.9-1.2 parts of a promoter DM and 0.5-0.7 part of a promoter D;
further, 80 parts of natural rubber, 10 parts of high styrene rubber, 10 parts of thermoplastic styrene-butadiene rubber, 2.0 parts of sulfur, 1.5 parts of stearic acid, 2.5 parts of active zinc oxide, 1 part of an anti-aging agent MB, 1 part of an anti-aging agent 264, 25 parts of light white carbon black, 30 parts of hollow glass microspheres, 5 parts of phenolic resin, 1.0 part of an accelerator DM and 0.6 part of an accelerator D;
further, the light white carbon black is light white carbon black YH350 produced by Nanping Jia union chemical industry Co., Ltd, Fujia province;
further, the surfaces of the hollow glass beads are modified by a coupling agent;
further, the hollow glass beads are hollow glass beads HY-5020 produced by Zhejiang Haiyue New materials GmbH.
The invention has the beneficial effects that: the rubber compound for the boot vamp of the light rubber boot has the characteristics of high rubber content and light specific gravity (about 1.08), and the tensile strength is more than or equal to 14 Ma; the elongation is more than or equal to 500 percent, the rebound resilience and the stiffness meet the product requirements, the rubber material is used for special protective rubber boots (such as various industrial and mining boots), the weight of the original protective rubber boots with double weight of 2.4Kg-3.4Kg can be successfully reduced to about 2.2 Kg-3.1 Kg, the weight reduction is very obvious for miners with very large daily walking amount and workload, the rolling shrinkage of the protective boots is small under the conditions of high rubber content and small reinforcing agent consumption, the patterns are clear, the boot surface stiffness is good, and the problems of large rolling shrinkage, unclear patterns, poor boot surface stiffness and the like caused by low reinforcing agent (such as light white carbon black and the like) consumption with high rubber content and small reinforcing agent consumption are solved.
Detailed Description
The rubber compound for the shoe surface of the light rubber boot comprises the following raw materials in parts by weight: 70-90 parts of natural rubber, 5-10 parts of high styrene rubber, 5-10 parts of thermoplastic styrene-butadiene rubber, 1.5-2.5 parts of sulfur, 1.0-2.0 parts of stearic acid, 2-4 parts of active zinc oxide, 0.8-1.5 parts of an anti-aging agent MB, 0.8-1.5 parts of an anti-aging agent 264, 20-40 parts of light white carbon black, 25-45 parts of hollow glass microspheres, 2-8 parts of phenolic resin, 0.8-1.5 parts of a promoter DM and 0.4-0.8 part of a promoter D, wherein the specific gravity of the light white carbon black is 1.2-1.5, and the specific gravity of the hollow glass microspheres is 0.18-0.21; multiple rubbers are adopted for matching use, the specific gravity of the natural rubber is 0.93, and reinforcing agents and filling agents with larger specific gravity are less used, so that the rubber content is improved; synergy between natural rubber, high styrene rubber and thermoplastic styrene-butadiene rubber (SEBS): in order to compensate the strength and boot surface stiffness (hardness) reduction caused by too little reinforcing agent dosage, solve the reinforcement of natural rubber, and increase the tensile strength and stiffness of rubber material by using part of high styrene rubber; the SEBS is used for reinforcing the natural rubber, and the advantages of small calendering shrinkage and clear patterns of the SEBS are used, so that the problems of large calendering shrinkage and unclear patterns caused by high glue content of a natural rubber formula are solved. The light white carbon black with the specific gravity of 1.2-1.5 and the hollow glass beads with the specific gravity of 0.18-0.21 are adopted to further greatly reduce the specific gravity of the rubber material, other performances of the rubber material for the vamp are not affected, the phenolic resin is adopted to play a role of a softener during mixing, a tackifying role is played to a semi-finished rubber sheet, a reinforcing and hardening role is played after vulcanization, and the stiffness of the vamp is improved.
Preferably, the sizing material comprises the following components in parts by weight: 75-85 parts of natural rubber, 8-10 parts of high styrene rubber, 8-10 parts of thermoplastic styrene-butadiene rubber, 1.8-2.2 parts of sulfur, 1.3-1.7 parts of stearic acid, 2-3 parts of active zinc oxide, 0.8-1.2 parts of an anti-aging agent MB, 0.8-1.2 parts of an anti-aging agent 264, 20-30 parts of light white carbon black, 25-35 parts of hollow glass microspheres, 4-6 parts of phenolic resin and 0.9-1.2 parts of an accelerator DM, and 0.5-0.7 part of an accelerator D;
more preferably, 80 parts of natural rubber, 10 parts of high styrene rubber, 10 parts of thermoplastic styrene-butadiene rubber, 2.0 parts of sulfur, 1.5 parts of stearic acid, 2.5 parts of active zinc oxide, 1 part of anti-aging agent MB, 1 part of anti-aging agent 264, 25 parts of light white carbon black, 30 parts of hollow glass microspheres, 5 parts of phenolic resin, 1.0 part of accelerator DM and 0.6 part of accelerator D;
in this embodiment, the light white carbon black is light white carbon black YH350 produced by nanping jia union chemical limited company in fujia province; the surfaces of the hollow glass beads are modified by a coupling agent; the hollow glass beads are hollow glass beads HY-5020 produced by Zhejiang Haiyue New materials GmbH; hollow glass bead HY-5020: the specific gravity is about 0.20, which is far lower than the specific gravity of fillers such as common commercial white carbon black (the specific gravity is between 2.3 and 2.6), light calcium carbonate (the specific gravity is about 2.2) and the like. The surface is modified by a coupling agent, and the reinforcing effect is far better than that of light calcium carbonate and argil and is only slightly inferior to that of white carbon black.
Example one
The rubber compound for the shoe surface of the light rubber boot comprises the following raw materials in parts by weight: 90 parts of natural rubber, 5 parts of high styrene rubber, 5 parts of thermoplastic styrene-butadiene rubber, 1.5 parts of sulfur, 1.0 part of stearic acid, 2 parts of active zinc oxide, 0.8 part of antioxidant MB, 0.8 part of antioxidant 264, 20 parts of light white carbon black, 25 parts of hollow glass microspheres, 2 parts of phenolic resin, 1.5 parts of accelerator DM and 0.8 part of accelerator D. The specific gravity of the light white carbon black is 1.2-1.5, the specific gravity of the hollow glass beads is 0.18-0.21, the surfaces of the hollow glass beads are modified by a coupling agent, and the hollow glass beads are hollow glass beads HY-5020 produced by Zhejiang Haiyue new material company Limited; the light white carbon black is light white carbon black YH350 produced by Nanping Jia union chemical industry Co.
Example two
The rubber compound for the shoe surface of the light rubber boot comprises the following raw materials in parts by weight: 80 parts of natural rubber, 10 parts of high styrene rubber, 10 parts of thermoplastic styrene-butadiene rubber, 2.5 parts of sulfur, 2.0 parts of stearic acid, 4 parts of active zinc oxide, 1.5 parts of an anti-aging agent MB, 1.5 parts of an anti-aging agent 264, 25 parts of light white carbon black, 30 parts of hollow glass microspheres, 8 parts of phenolic resin, 1.2 parts of an accelerator DM and 0.5 part of an accelerator D, wherein the specific gravity of the light white carbon black is 1.2-1.5, the specific gravity of the hollow glass microspheres is 0.18-0.21, the surfaces of the hollow glass microspheres are modified by a coupling agent, and the hollow glass microspheres are hollow glass microspheres HY-5020 produced by Zhejiang Haiyue new material GmbH; the light white carbon black is light white carbon black YH350 produced by Nanping Jia union chemical industry Co.
EXAMPLE III
The rubber compound for the shoe surface of the light rubber boot comprises the following raw materials in parts by weight: 70 parts of natural rubber, 8 parts of high styrene rubber, 8 parts of thermoplastic styrene-butadiene rubber, 1.8 parts of sulfur, 1.3 parts of stearic acid, 2 parts of active zinc oxide, 0.8 part of an anti-aging agent MB, 0.8 part of an anti-aging agent 264, 45 parts of light white carbon black, 40 parts of hollow glass microspheres, 4 parts of phenolic resin, 0.8 part of an accelerator DM and 0.4 part of an accelerator D, wherein the specific gravity of the light white carbon black is 1.2-1.5, the specific gravity of the hollow glass microspheres is 0.18-0.21, the surfaces of the hollow glass microspheres are modified by a coupling agent, and the hollow glass microspheres are hollow glass microspheres HY-5020 produced by Zhejiang Haiyue new material company Limited; the light white carbon black is light white carbon black YH350 produced by Nanping Jia union chemical industry Co.
Example four
The rubber compound for the shoe surface of the light rubber boot comprises the following raw materials in parts by weight: 85 parts of natural rubber, 10 parts of high styrene rubber, 10 parts of thermoplastic styrene-butadiene rubber, 2.2 parts of sulfur, 1.7 parts of stearic acid, 3 parts of active zinc oxide, 1.2 parts of an anti-aging agent MB, 1.2 parts of an anti-aging agent 264, 30 parts of light white carbon black, 35 parts of hollow glass microspheres, 6 parts of phenolic resin, 1.0 part of an accelerator DM and 0.6 part of an accelerator D; the specific gravity of the light white carbon black is 1.2-1.5, the specific gravity of the hollow glass beads is 0.18-0.21, the surfaces of the hollow glass beads are modified by a coupling agent, and the hollow glass beads are hollow glass beads HY-5020 produced by Zhejiang Haiyue new material company Limited; the light white carbon black is light white carbon black YH350 produced by Nanping Jia union chemical industry Co.
EXAMPLE five
The rubber compound for the shoe surface of the light rubber boot comprises the following raw materials in parts by weight: 70 parts of natural rubber, 10 parts of high styrene rubber, 5 parts of thermoplastic styrene-butadiene rubber, 2.5 parts of sulfur, 1.0 part of stearic acid, 4 parts of active zinc oxide, 0.8 part of anti-aging agent MB, 1.5 parts of anti-aging agent 264, 20 parts of light white carbon black, 45 parts of hollow glass microspheres, 2 parts of phenolic resin, 1.0 part of accelerator DM and 0.6 part of accelerator D; the specific gravity of the light white carbon black is 1.2-1.5, the specific gravity of the hollow glass beads is 0.18-0.21, the surfaces of the hollow glass beads are modified by a coupling agent, and the hollow glass beads are hollow glass beads HY-5020 produced by Zhejiang Haiyue new material company Limited; the light white carbon black is light white carbon black YH350 produced by Nanping Jia union chemical industry Co.
EXAMPLE six
The rubber compound for the shoe surface of the light rubber boot comprises the following raw materials in parts by weight: 80 parts of natural rubber, 10 parts of high styrene rubber, 10 parts of thermoplastic styrene-butadiene rubber, 2.0 parts of sulfur, 1.5 parts of stearic acid, 2.5 parts of active zinc oxide, 1 part of antioxidant MB, 1 part of antioxidant 264, 25 parts of light white carbon black, 30 parts of hollow glass microspheres, 5 parts of phenolic resin, 1.0 part of accelerator DM and 0.6 part of accelerator D; the specific gravity of the light white carbon black is 1.2-1.5, the specific gravity of the hollow glass beads is 0.18-0.21, the surfaces of the hollow glass beads are modified by a coupling agent, and the hollow glass beads are hollow glass beads HY-5020 produced by Zhejiang Haiyue new material company Limited; the light white carbon black is light white carbon black YH350 produced by Nanping Jia union chemical industry Co.
EXAMPLE seven
The rubber compound for the shoe surface of the light rubber boot comprises the following raw materials in parts by weight: 85 parts of natural rubber, 8 parts of high styrene rubber, 10 parts of thermoplastic styrene-butadiene rubber, 1.8 parts of sulfur, 1.7 parts of stearic acid, 2 parts of active zinc oxide, 1.2 parts of an anti-aging agent MB, 0.8 part of an anti-aging agent 264, 30 parts of light white carbon black, 25 parts of hollow glass microspheres and 6 parts of phenolic resin; 1.0 part of accelerator DM and 0.6 part of accelerator D; the specific gravity of the hollow glass beads is 0.18-0.21, the surfaces of the hollow glass beads are modified by a coupling agent, and the hollow glass beads are hollow glass beads HY-5020 produced by Zhejiang Haiyue New Material Ltd; the light white carbon black is light white carbon black YH350 produced by Nanping Jia union chemical industry Co.
In the above examples, examples 2 to 7 all had better effects than example 1.
Comparative test example 1
The high styrene rubber in example one was removed and the remaining components and amounts were unchanged.
Comparative test example 2
The thermoplastic styrene-butadiene rubber in the first example is removed, and the other components and the amount are unchanged.
Comparative test example three
The light white carbon in the third example is replaced by common white carbon black, and the rest components and the using amount are unchanged.
Remarking: the "appearance" in the table means the properties of the rubber compound used for the shoe upper in terms of "rolling shrinkage, pattern definition, shoe upper stiffness" and the like.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (6)
1. The light rubber boot vamp compound rubber material is characterized in that: the sizing material comprises the following components in parts by weight: 70-90 parts of natural rubber, 5-10 parts of high styrene rubber, 5-10 parts of thermoplastic styrene-butadiene rubber, 1.5-2.5 parts of sulfur, 1.0-2.0 parts of stearic acid, 2-4 parts of active zinc oxide, 0.8-1.5 parts of an anti-aging agent MB, 0.8-1.5 parts of an anti-aging agent 264, 20-40 parts of light white carbon black, 25-45 parts of hollow glass microspheres, 2-8 parts of phenolic resin, 0.8-1.5 parts of a promoter DM and 0.4-0.8 part of a promoter D, wherein the specific gravity of the light white carbon black is 1.2-1.5, and the specific gravity of the hollow glass microspheres is 0.18-0.21.
2. The light weight rubber boot shoe mix compound of claim 1, characterized by: the sizing material comprises the following components in parts by weight: 75-85 parts of natural rubber, 8-10 parts of high styrene rubber, 8-10 parts of thermoplastic styrene-butadiene rubber, 1.8-2.2 parts of sulfur, 1.3-1.7 parts of stearic acid, 2-3 parts of active zinc oxide, 0.8-1.2 parts of an anti-aging agent MB, 0.8-1.2 parts of an anti-aging agent 264, 20-30 parts of light white carbon black, 25-35 parts of hollow glass microspheres, 4-6 parts of phenolic resin, 0.9-1.2 parts of a promoter DM and 0.5-0.7 part of a promoter D.
3. The light rubber boot vamp compound rubber compound according to claim 2, wherein the rubber compound comprises the following components in parts by weight: 80 parts of natural rubber, 10 parts of high styrene rubber, 10 parts of thermoplastic styrene-butadiene rubber, 2.0 parts of sulfur, 1.5 parts of stearic acid, 2.5 parts of active zinc oxide, 1 part of antioxidant MB, 1 part of antioxidant 264, 25 parts of light white carbon black, 30 parts of hollow glass microspheres, 5 parts of phenolic resin, 1.0 part of accelerator DM and 0.6 part of accelerator D.
4. The light weight rubber boot shoe mix compound of claim 1, characterized by: the light white carbon black is white carbon black YH350 produced by Nanping Jia union chemical industry Co.
5. A light weight rubber boot shoe tread mix compound as claimed in claim 4, wherein: the surfaces of the hollow glass beads are modified by a coupling agent.
6. A light weight rubber boot shoe mix compound as claimed in claim 5, characterized in that: the hollow glass beads are hollow glass beads HY-5020 produced by Zhejiang Haiyue New materials GmbH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010384060.3A CN111440361A (en) | 2020-05-08 | 2020-05-08 | Light rubber boot vamp compound rubber material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010384060.3A CN111440361A (en) | 2020-05-08 | 2020-05-08 | Light rubber boot vamp compound rubber material |
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| CN111440361A true CN111440361A (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010384060.3A Pending CN111440361A (en) | 2020-05-08 | 2020-05-08 | Light rubber boot vamp compound rubber material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111925566A (en) * | 2020-08-18 | 2020-11-13 | 际华易北河高分子材料科技(岳阳)有限公司 | Low-Mooney-viscosity natural rubber and preparation method thereof, low-Mooney-viscosity foamed natural rubber compound and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030145484A1 (en) * | 2002-02-05 | 2003-08-07 | Eddie Chen | Breathable rubber boot |
| CN102702583A (en) * | 2012-05-21 | 2012-10-03 | 际华三五三九制鞋有限公司 | Rubber compound for industrial and mineral rubber boot vamp |
| CN103333373A (en) * | 2013-06-27 | 2013-10-02 | 际华三五三九制鞋有限公司 | Acid and alkali resistant rubber boot vamp rubber compound and preparation method thereof |
-
2020
- 2020-05-08 CN CN202010384060.3A patent/CN111440361A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030145484A1 (en) * | 2002-02-05 | 2003-08-07 | Eddie Chen | Breathable rubber boot |
| CN102702583A (en) * | 2012-05-21 | 2012-10-03 | 际华三五三九制鞋有限公司 | Rubber compound for industrial and mineral rubber boot vamp |
| CN103333373A (en) * | 2013-06-27 | 2013-10-02 | 际华三五三九制鞋有限公司 | Acid and alkali resistant rubber boot vamp rubber compound and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 谢忠麟等编: "《橡胶制品实用配方大全》", 30 April 2001, 化学工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111925566A (en) * | 2020-08-18 | 2020-11-13 | 际华易北河高分子材料科技(岳阳)有限公司 | Low-Mooney-viscosity natural rubber and preparation method thereof, low-Mooney-viscosity foamed natural rubber compound and preparation method thereof |
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