CN103012871B - Natural rubber foam material and preparation method thereof - Google Patents
Natural rubber foam material and preparation method thereof Download PDFInfo
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- CN103012871B CN103012871B CN201210567260.8A CN201210567260A CN103012871B CN 103012871 B CN103012871 B CN 103012871B CN 201210567260 A CN201210567260 A CN 201210567260A CN 103012871 B CN103012871 B CN 103012871B
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Abstract
The invention discloses a natural rubber foam material and a preparation method of the natural rubber foam material. The foam material comprises the following components by weight part: 70-90 parts of natural rubber, 15-25 parts of elastic bodies, 30-50 parts of reinforcing agent, 2-6 parts of accelerating agent, 3-4 parts of vulcanizing agent, 0.1-0.5 part of cross-linking agent, 2-6 parts of foaming agent and 4-10 parts of blowing promotor. A finished product is obtained through the steps of material compounding, milling of a milling machine, mixing, open milling and forming. According to the invention, as the factors of compatibility, vulcanization of rubber and foaming matching exist, the problems that the obtained foam material has larger foaming holes and does not distributed uniformly, the rebound elasticity cannot meet the technical requirement of a product, and the cost remains high at the same time caused by the situation that various types of synthetic rubber are added in natural rubber to prepare rubber foam material are solved.
Description
Technical field
The invention belongs to foaming natural rubber material technical field, relate in particular to a kind of natural rubber foam material and preparation method thereof.
Background technology
Foaming natural rubber material is due to features such as its density are little, quality is light, specific area is large, specific tenacity is high, energy absorption capability is strong, and damping, sound insulation and heat-proof quality are good, so be widely used on various production and sphere of life.But natural rubber cost is higher, and foam material density is larger, affect end article abscess quality, mechanical property factor much and comparatively complicated, thereby limit its industrial applications.The method that can be used at present preparing rubber expanded material has: in natural rubber, add all kinds synthetic rubber, because consistency, the vulcanization of rubber such as mate at the problem with foaming, finally obtain the large and skewness of foaming product abscess, rebound resilience can not reach product technology requirement, and cost is high simultaneously.Therefore, do not reducing under the condition of its original excellent mechanical performances, exploitation a kind of convenient and simple, with low cost, abscess is little, cell density is large, method that can large-scale production rubber expanded material has great importance to expanding its range of application.
Summary of the invention
The technical problem to be solved in the present invention: a kind of natural rubber foam material and preparation method thereof is provided, prepare rubber expanded material employing with solution and in natural rubber, add all kinds synthetic rubber, the factor such as mate with foaming owing to there is consistency, the vulcanization of rubber, make to obtain foam material and have abscess greatly and skewness, the problems such as rebound resilience can not reach product technology requirement, and while cost is high.
Technical solution of the present invention:
A kind of natural rubber foam material, by weight, this material composition comprises: 4～10 parts of 70～90 parts of natural rubbers, 15～25 parts, elastomerics, 30～50 parts of tougheners, 2～6 parts of promotor, 3～4 parts of vulcanizing agents, 0.1～0.5 part of linking agent, 2～6 parts of whipping agents and frothing aids.
Elastomerics is Low Density Polyethylene, and weight part is: 20 parts.
Whipping agent is that 4,4-OBSH or Cellmic C 121 weight part are: 3 parts.
Promotor is tetramethyl thiuram disulfide or thiol benzothiazole, and weight part is 3 parts.
The preparation method of described natural rubber foam material: it comprises the steps:
Step 1, batching: within the scope of component proportion, configure as required the total amount of foam material, be counted as the required weight of each component and configure material;
Beneficial effect of the present invention:
The principle of technical solution of the present invention is: by natural rubber, elastomerics, whipping agent, while preparing foam material after the mixing such as promotor, elastomerics selects Low Density Polyethylene (LDPE), improving goods rebound resilience by consistency mechanism reduces costs, by whipping agent increase aerogenesis speed and gas production rate, vulcanization rate scope is widened in the interpolation of promotor, vulcanization rate and expansion rate are matched, obtain the rubber item of desirable foaming quality, the present invention compared with prior art, the present invention adds elastomerics Low Density Polyethylene (LDPE) in natural rubber, whipping agent, the materials such as promotor play vulcanization rate and the fine effect of mating of expansion rate by different ingredients design, thereby reach good foaming effect, expansion ratio is larger, after adding Low Density Polyethylene (LDPE), reducing under preparation cost condition, rebound resilience declines less simultaneously, with add in the market synthetic rubber and compare with elastomerics, it is a kind of technology of good cost performance, solve and prepared rubber expanded material and adopt and in natural rubber, add all kinds synthetic rubber, the factor such as mate with foaming owing to there is consistency, the vulcanization of rubber, make to obtain foam material and have abscess greatly and skewness, the problems such as rebound resilience can not reach product technology requirement, and while cost is high.
brief description of the drawings:
Fig. 1 be promotor tetramethyl thiuram disulfide (TT) and thiol benzothiazole (M) under different content to natural rubber foam material abscess-size influence curve figure;
Fig. 2 is promotor tetramethyl thiuram disulfide (TT) and thiol benzothiazole (M) influence curve figure to natural rubber foam material cell size distribution under different content;
Fig. 3 be under different content whipping agent Cellmic C 121 (AC) and 4,4-OBSH (OBSH) to natural rubber foam material abscess-size influence curve figure;
Fig. 4 be under different content whipping agent Cellmic C 121 (AC) and 4,4-OBSH (OBSH) to natural rubber foam material cell size distribution influence curve figure.
embodiment:
A kind of natural rubber foam material, by weight, this material composition comprises: 4～10 parts of 70～90 parts of natural rubbers, 15～25 parts, elastomerics, 30～50 parts of tougheners, 2～6 parts of promotor, 3～4 parts of vulcanizing agents, 0.1～0.5 part of linking agent, 2～6 parts of whipping agents and frothing aids.
embodiment 1:
Step 1, raw material are chosen: natural rubber selects 1# standard natural rubber, trade mark SCR, Xishuangbanna Nan Bo limited liability company, natural rubber, 80 parts of content
Elastomerics selects Low Density Polyethylene (LDPE), 20 parts of content
Toughener selects white bole, 40 parts of content;
Promotor is selected 2-thiol benzothiazole (M), Anyang Wei Bo chemical industry limited liability company; Captax adds with 2 parts, 3 parts, 4 parts, 5 parts, 6 parts respectively;
Vulcanizing agent selects Sulfur, 3.5 parts of content;
Linking agent selects dicumyl peroxide (DCP), 0.3 part of content
Whipping agent selects 4,4-OBSH (OBSH), and content is: 3 parts;
Frothing aid selects stearic acid, and content is: 5 parts.
Embodiment 2:
Step 1, raw material are chosen: natural rubber selects 1# standard natural rubber, trade mark SCR, and Xishuangbanna Nan Bo limited liability company; Natural rubber, 80 parts of content
Elastomerics choosing: Low Density Polyethylene (LDPE), 20 parts of content
Toughener selects white bole, 40 parts of content;
Promotor is selected tetramethyl thiuram disulfide (TT), Anyang Wei Bo chemical industry limited liability company; Promotor TT adds with 2 parts, 3 parts, 4 parts, 5 parts, 6 parts respectively;
Vulcanizing agent selects Sulfur, 3.5 parts of content;
Linking agent selects dicumyl peroxide (DCP), 0.3 part of content
Whipping agent selects 4,4-OBSH (OBSH), and content is: 3 parts;
Frothing aid selects stearic acid, and content is: 5 parts.
Repeating step 2-5 in embodiment 1 gets product.
Fig. 1～Fig. 2 is the impact of dissimilar promotor and the foaming quality of content on natural rubber foam composite material thereof, can draw from Fig. 1,2: no matter be captax or TT, with the increase of accelerator content, abscess mean diameter and the distribution of sizes of natural rubber foam material present the trend that first reduces rear increase, accelerator content is in the time of 3-4 part scope, and foam structure, abscess mean diameter and distribution of cells are suitable for the preparation of natural rubber foam composite material goods; The vulcanization characteristics of natural rubber mates best with foaming character, can obtain the little and good uniformity of abscess mean diameter, the microporous foam natural rubber foam material that cell density is larger, be suitable for micro-bipeltate goods exploitation, when exceeding 4 parts of post-foaming quality, accelerator content has the trend of variation, abscess mean sizes increases, and cell size distribution broadens, and the apparent density of material is larger.
Step 1, raw material are chosen: natural rubber selects 1# standard natural rubber, trade mark SCR, the rich limited liability in south, Xishuangbanna
Natural rubber, 80 parts of content
Elastomerics choosing: Low Density Polyethylene (LDPE), 20 parts of content
Toughener selects white bole, 40 parts of content;
Promotor is selected TT, Anyang Wei Bo chemical industry limited liability company; Promotor TT content: 3 parts
Vulcanizing agent selects Sulfur, 3 parts of content;
Linking agent selects dicumyl peroxide (DCP), 0.3 part of content
Whipping agent selects 4,4-OBSH (OBSH), and content is: add with 2 parts, 3 parts, 4 parts, 5 parts, 6 parts respectively;
Frothing aid selects stearic acid, and content is: 5 parts.
Repeating step 2-5 in embodiment 1 gets product.
Embodiment 4:
Step 1, raw material are chosen: natural rubber selects 1# standard natural rubber, trade mark SCR, Xishuangbanna Nan Bo limited liability company, natural rubber, 80 parts of content;
Elastomerics choosing: Low Density Polyethylene (LDPE), 20 parts of content;
Toughener selects white bole, 40 parts of content;
Promotor is selected TT, Anyang Wei Bo chemical industry limited liability company; Promotor TT3 part
Vulcanizing agent selects Sulfur, 3 parts of content;
Linking agent selects dicumyl peroxide (DCP), 0.3 part of content
Whipping agent selects Cellmic C 121 (AC) to add with 2 parts, 3 parts, 4 parts, 5 parts, 6 parts respectively;
Frothing aid selects stearic acid, and content is: 5 parts.
Repeating step 2-5 in embodiment 1 gets product.
Fig. 3～Fig. 4 is the impact of dissimilar whipping agent and the foaming quality of content on natural rubber foam composite material thereof, can draw from Fig. 3,4, and the abscess mean diameter after interpolation blowing agent AC or OBSH is less, and cell size distribution is even, and cell density is large; When whipping agent OBSH or AC content are 3 parts, the abscess of material is best in quality, and abscess mean diameter is less, and abscess-size is more even, and cell density is larger, is suitable for micro-bipeltate goods exploitation.
Embodiment 5:
Step 1, raw material are chosen: natural rubber selects 1# standard natural rubber, trade mark SCR, Xishuangbanna Nan Bo limited liability company, natural rubber, 70 parts of content;
Elastomerics choosing: Low Density Polyethylene (LDPE), 15 parts of content;
Toughener selects white bole, 30 parts of content;
Promotor is selected TT, Anyang Wei Bo chemical industry limited liability company; 2 parts of content
Vulcanizing agent selects Sulfur, 3 parts of content;
Linking agent selects dicumyl peroxide (DCP), 0.1 part of content
Whipping agent selects OBSH or AC, 2 parts of content;
Frothing aid selects stearic acid, and content is: 4 parts.
Repeating step 2-5 in embodiment 1 gets product.
Table 1, table 2 result show: add the natural rubber composite foam material of making according to said ratio, its foaming quality ideal, abscess mean diameter, cell diameter distribute and cell density is respectively 168.2 μ m, 82.6 μ m, 2288083/cm-3 are obviously better than market rubber foamed product from the viewpoint of foaming behavior.For mechanical property aspect, rubber foamed product of the present invention, Shao Er hardness and rebound degree are larger, and bounce impact elasticity generation part degree lowers, but compare with market rubber foamed product, its over-all properties is more satisfactory.
Embodiment 6:
Step 1, raw material are chosen: natural rubber selects 1# standard natural rubber, trade mark SCR, Xishuangbanna Nan Bo limited liability company, natural rubber, 80 parts of content;
Elastomerics choosing: Low Density Polyethylene (LDPE), 20 parts of content;
Toughener selects white bole, 40 parts of content;
Promotor is selected TT, Anyang Wei Bo chemical industry limited liability company; 4 parts of content
Vulcanizing agent selects Sulfur, 3.5 parts of content;
Linking agent selects dicumyl peroxide (DCP), 0.3 part of content
Whipping agent selects OBSH or AC, 4 parts of content;
Frothing aid selects stearic acid, and content is: 7 parts.
Repeating step 2-5 in embodiment 1 gets product.
Table 3, table 4 result shows: add the natural rubber composite foam material of making according to said ratio, its foaming quality ideal, abscess mean diameter, cell diameter distributes and cell density is respectively 131.3 μ m, 52.6 μ m, 3243082/cm-3 is obviously better than market rubber foamed product from the viewpoint of foaming behavior, for mechanical property aspect, rubber foamed product of the present invention, Shao Er hardness is lower, rebound degree and bounce impact elasticity are larger, compared with the rubber foamed product of same market, no matter be that foaming quality or over-all properties are more suitable for developing in rubber foamed product.
Embodiment 7:
Step 1, raw material are chosen: natural rubber selects 1# standard natural rubber, trade mark SCR, Xishuangbanna Nan Bo limited liability company, natural rubber, 90 parts of content;
Elastomerics choosing: Low Density Polyethylene (LDPE), 25 parts of content;
Toughener selects white bole, 50 parts of content;
Promotor is selected TT, Anyang Wei Bo chemical industry limited liability company; 6 parts of content
Vulcanizing agent selects Sulfur, 4 parts of content;
Linking agent selects dicumyl peroxide (DCP), 0.5 part of content
Whipping agent selects OBSH or AC, 6 parts of content;
Frothing aid selects stearic acid, and content is: 10 parts.
Repeating step 2-5 in embodiment 1 gets product.
See the following form 5, table 6 result shows: add the natural rubber composite foam material of making according to said ratio, its foaming quality ideal, abscess mean diameter, cell diameter distribute and cell density is respectively 181.3 μ m, 73.4 μ m, 1843011/cm-3 are better than market rubber foamed product from the viewpoint of foaming behavior.For mechanical property aspect, rubber foamed product of the present invention, Shao Er hardness is lower, and rebound degree is larger, and bounce impact elasticity generation part degree reduces, and compared with the rubber foamed product of same market, this formulating of recipe is also suitable for rubber foamed product exploitation.
Claims (4)
1. a preparation method for natural rubber foam material, is characterized in that: it comprises subordinate's step:
Step 1, batching: the ratio range that is 4～10 parts of 70～90 parts of natural rubbers, 15～25 parts, elastomerics, 30～50 parts of tougheners, 2～6 parts of promotor, 3～4 parts of vulcanizing agents, 0.1～0.5 part of linking agent, 2～6 parts of whipping agents and frothing aids according to component is selected each component and configures material; Wherein said elastomerics is Low Density Polyethylene, described promotor is tetramethyl thiuram disulfide or thiol benzothiazole, and described whipping agent is 4,4-OBSH or Cellmic C 121, described frothing aid is stearic acid, and described toughener is white bole;
Step 2, kneading: at ambient temperature, the natural rubber configuring is put into milling machine kneading to Wei Shi plasticity number and make its value reach 0.5-0.8, obtain rubber A;
Step 3, mixing: the rubber A that step 2 is obtained mixes in torque rheometer with the elastomerics configuring, mixing temperature is 80 DEG C, rotating speed is 60 revs/min, time 10-20 minute, obtain rubber unvulcanizate B, add successively in order toughener, promotor, frothing aid, whipping agent, linking agent and vulcanizing agent, in milling machine, kneading is even, after mixing, under 23 DEG C of conditions, kneading, to plasticity number 0.5-0.8, obtains rubber unvulcanizate C;
Step 4, open refining: by rubber unvulcanizate C thin-pass 3-5 time in mill, roll spacing is less than 1mm, is then that thickness is the film of 3-3.5mm with mill by its calendering, the cutting work in-process that are shaped to obtain;
Step 5, moulding: work in-process are put into mould, in the time that hot pressing temperature is 150 DEG C, hot-pressing and foaming moulding in vulcanizing press, curing time is 10min, pressure is 10MPa.
2. the preparation method of natural rubber foam material according to claim 1, is characterized in that: elastomerics is Low Density Polyethylene, and weight part is 20 parts.
3. the preparation method of natural rubber foam material according to claim 1, is characterized in that: whipping agent is 4,4-OBSH or Cellmic C 121, and weight part is 3 parts.
4. the preparation method of natural rubber foam material according to claim 1, is characterized in that: promotor is tetramethyl thiuram disulfide or thiol benzothiazole, and weight part is 3 parts.
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| CN103205047A (en) * | 2013-04-26 | 2013-07-17 | 中塑联新材料科技湖北有限公司 | High pressure polyethylene density regulator |
| CN103689855B (en) * | 2013-12-27 | 2015-10-14 | 石狮蚂蚁城鞋服有限公司 | A kind of deodorization and sterilization durable leather shoe |
| CN105014856A (en) * | 2014-04-25 | 2015-11-04 | 厦门奥泉橡胶有限公司 | Surface forming process for foam rubber product with patterns |
| WO2018143899A1 (en) * | 2017-02-03 | 2018-08-09 | Kongparakul Suwadee | Porosity control process of modified natural rubber foam and its application for oil sorption |
| CN110713646B (en) * | 2018-07-13 | 2022-05-27 | 杭州星庐科技有限公司 | Rubber composition and tire using the same |
| CN110713658B (en) * | 2018-07-13 | 2022-06-21 | 杭州星庐科技有限公司 | Rubber composition and processing method, and rubber product and production method using same |
| WO2023114907A1 (en) * | 2021-12-15 | 2023-06-22 | Bridgestone Americas Tire Operations, Llc | Cellular natural rubber articles |
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| CN102250408A (en) * | 2011-06-01 | 2011-11-23 | 王万炯 | High-molecular foamed material and preparation method thereof |
| CN102690459A (en) * | 2012-04-27 | 2012-09-26 | 华东理工大学 | High-resilience chemical crosslinked polyethylene foam material and preparation method thereof |
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