CN103012871A - Natural rubber foam material and preparation method thereof - Google Patents

Natural rubber foam material and preparation method thereof Download PDF

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CN103012871A
CN103012871A CN2012105672608A CN201210567260A CN103012871A CN 103012871 A CN103012871 A CN 103012871A CN 2012105672608 A CN2012105672608 A CN 2012105672608A CN 201210567260 A CN201210567260 A CN 201210567260A CN 103012871 A CN103012871 A CN 103012871A
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natural rubber
foam material
rubber
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CN103012871B (en
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龚维
张纯
何力
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National Composite Modified Polymer Material Engineering Technology Research Cen
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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

A kind of natural rubber foam material and preparation method thereof
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
The characteristics such as the foaming natural rubber material is little owing to its density, 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 are so be widely used on various productions and the sphere of life.But the 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: add all kinds synthetic rubber in natural rubber, because problems such as consistency, the vulcanization of rubber and foaming couplings, finally obtain the large and skewness of foaming product abscess, rebound resilience can not reach the product technology requirement, and cost is high simultaneously.Therefore, under the condition that does not reduce its original excellent mechanical performances, develop a kind of convenient and simple, with low cost, abscess is little, cell density is large, method that can the large-scale production rubber expanded material has great importance to enlarging 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, adopt adding all kinds synthetic rubber in natural rubber to solve the preparation rubber expanded material, owing to there being the factors such as consistency, the vulcanization of rubber and foaming coupling, make and obtain foam material and have the large and skewness of abscess, the problems such as rebound resilience can not reach the product technology requirement, and the 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 on 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: in the component proportion scope, configure as required the total amount of foam material, be counted as the required weight of each component and configure material;
Step 2, kneading: at ambient temperature, the natural rubber that configures is put into milling machine kneading to Wei Shi plasticity number value reach 0.5-0.8, obtain rubber A;
Step 3, mixing: step 2 the rubber A that obtains and the elastomerics that configures are mixed in torque rheometer, mixing temperature is 80 ℃, rotating speed is 60 rev/mins, time 10-20 minute, obtain rubber unvulcanizate B, add successively in order toughener, promotor, frothing aid, whipping agent, linking agent, vulcanizing agent, kneading is even in milling machine, after mixing under 23 ℃ of conditions kneading obtain rubber unvulcanizate C to plasticity number 0.5-0.8;
Step 4, open refining: with rubber unvulcanizate C thin-pass 3-5 time in mill, then roll spacing is that thickness is the film of 3-3.5mm with mill with its calendering less than 1mm, the cutting work in-process that are shaped to get;
Step 5, moulding: work in-process are put into mould, when hot pressing temperature is 150 ℃, hot-pressing and foaming moulding in vulcanizing press, curing time is 10min, pressure is 10MPa.
Beneficial effect of the present invention:
The principle of technical solution of the present invention is: with natural rubber, elastomerics, whipping agent, when preparing foam material after promotor etc. are mixed, elastomerics selects Low Density Polyethylene (LDPE), improve the goods rebound resilience by consistency mechanism and reduce cost, increase aerogenesis speed and gas production rate with whipping agent, the vulcanization rate scope is widened in the interpolation of promotor, vulcanization rate and expansion rate are complementary, 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 the effect of vulcanization rate and the fine coupling of expansion rate by the different ingredients design, thereby reach good foaming effect, expansion ratio is larger; Reducing under the preparation cost condition after adding simultaneously Low Density Polyethylene (LDPE), rebound resilience descends less; With add in the market synthetic rubber and compare with elastomerics, it is a kind of technology of good cost performance, solve the preparation rubber expanded material and adopted adding all kinds synthetic rubber in natural rubber, owing to there being the factors such as consistency, the vulcanization of rubber and foaming coupling, make and obtain foam material and have the large and skewness of abscess, the problems such as rebound resilience can not reach the product technology requirement, and the while cost is high.
Description of 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) the influence curve figure to natural rubber foam material cell size distribution under different content;
Fig. 3 be under the 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 the 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 on 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 the 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), the big rich chemical industry in Anyang limited liability company; Captax is respectively with 2 parts, 3 parts, 4 parts, 5 parts, 6 parts addings;
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.
Step 2, kneading: at ambient temperature, the natural rubber that configures is put into milling machine kneading to Wei Shi plasticity number make its value reach 0.5-0.8, obtain rubber A;
Step 3, mixing: step 2 the rubber A that obtains and the elastomerics that configures are mixed in torque rheometer, mixing temperature is 80 ℃, rotating speed is 60 rev/mins, time 10-20 minute, obtain rubber unvulcanizate B, add successively in order toughener, promotor, frothing aid, whipping agent, linking agent, vulcanizing agent, kneading is even in milling machine, after mixing under 23 ℃ of conditions kneading obtain rubber unvulcanizate C to plasticity number 05-0.8;
Step 4, open refining: with rubber unvulcanizate C thin-pass 3-5 time in mill, then roll spacing is that thickness is the film of 3-3.5mm with mill with its calendering less than 1mm, through the cutting work in-process that are shaped to get;
Step 5, moulding: work in-process are put into mould, when hot pressing temperature is 150 ℃, hot-pressing and foaming moulding in vulcanizing press, curing time is 10min, pressure is 10MPa.
Embodiment 2:
Step 1, raw material are chosen: natural rubber selects the 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), the big rich chemical industry in Anyang limited liability company; Promotor TT is respectively with 2 parts, 3 parts, 4 parts, 5 parts, 6 parts addings;
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.
Step 2-5 gets product among the repetition embodiment 1.
Fig. 1~Fig. 2 is that dissimilar promotor and content thereof are on the impact of the foaming quality of natural rubber foam composite material, can draw from Fig. 1,2: no matter be captax or TT, increase with accelerator content, abscess mean diameter and the distribution of sizes of natural rubber foam material present the trend that reduces first rear increase, accelerator content is when 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 and foaming character coupling are best, 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 little bipeltate goods exploitation, when accelerator content surpasses the trend that 4 parts of post-foaming quality have variation, the abscess mean sizes increases, and cell size distribution broadens, and the apparent density of material is larger.
Embodiment 3
Step 1, raw material are chosen: natural rubber selects the 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, the big rich chemical industry in Anyang 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: respectively with 2 parts, 3 parts, 4 parts, 5 parts, 6 parts addings;
Frothing aid selects stearic acid, and content is: 5 parts.
Step 2-5 gets product among the repetition embodiment 1.
Embodiment 4:
Step 1, raw material are chosen: natural rubber selects the 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, the big rich chemical industry in Anyang 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) respectively with 2 parts, 3 parts, 4 parts, 5 parts, 6 parts addings;
Frothing aid selects stearic acid, and content is: 5 parts.
Step 2-5 gets product among the repetition embodiment 1.
Fig. 3~Fig. 4 be dissimilar whipping agent and content thereof on the impact of the foaming quality of natural rubber foam composite material, can draw from Fig. 3,4, the abscess mean diameter of adding behind blowing agent AC or the OBSH is less, cell size distribution is even, cell density is large; When whipping agent OBSH or AC content were 3 parts, the abscess of material was best in quality, and the abscess mean diameter is less, and abscess-size is more even, and cell density is larger, was suitable for little bipeltate goods exploitation.
Embodiment 5:
Step 1, raw material are chosen: natural rubber selects the 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, the big rich chemical industry in Anyang 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.
Step 2-5 gets product among the repetition embodiment 1.
Table 1, table 2 result show: add the natural rubber composite foam material of making according to said ratio, its foaming quality is desirable, and abscess mean diameter, cell diameter distribute and cell density is respectively 168.2 μ m, 82.6 μ m, 2288083/cm-3 consider obviously to be better than the market rubber foamed product from foaming behavior aspect.For the 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 the market rubber foamed product, its over-all properties is more satisfactory.
Figure 2012105672608100002DEST_PATH_IMAGE002
Embodiment 6:
Step 1, raw material are chosen: natural rubber selects the 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, the big rich chemical industry in Anyang 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.
Step 2-5 gets product among the repetition embodiment 1.
Table 3, table 4 is the result show: add the natural rubber composite foam material of making according to said ratio, its foaming quality is desirable, the abscess mean diameter, cell diameter distributes and cell density is respectively 131.3 μ m, 52.6 μ m, 3243082/cm-3 considers obviously to be better than the market rubber foamed product from foaming behavior aspect, for the mechanical property aspect, rubber foamed product of the present invention, Shao Er hardness is lower, rebound degree and bounce impact elasticity are larger, with compare with the market rubber foamed product, no matter be that foaming quality or over-all properties are more suitable for developing in rubber foamed product.
Figure 2012105672608100002DEST_PATH_IMAGE003
Figure DEST_PATH_IMAGE004
Embodiment 7:
Step 1, raw material are chosen: natural rubber selects the 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, the big rich chemical industry in Anyang 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.
Step 2-5 gets product among the repetition embodiment 1.
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 is desirable, and abscess mean diameter, cell diameter distribute and cell density is respectively 181.3 μ m, 73.4 μ m, 1843011/cm-3 consider to be better than the market rubber foamed product from foaming behavior aspect.For the 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 compares with the market rubber foamed product, and this formulating of recipe also is suitable for the rubber foamed product exploitation.
Figure DEST_PATH_IMAGE005
Figure DEST_PATH_IMAGE006

Claims (5)

1. natural rubber foam material, it is characterized in that: by weight, this material composition comprises: 4~10 parts of 70~90 parts of natural rubbers, 15~25 parts on 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.
2. natural rubber foam material according to claim 1, it is characterized in that: elastomerics is Low Density Polyethylene, and weight part is: 20 parts.
3. natural rubber foam material according to claim 1, it is characterized in that: whipping agent is 4,4-OBSH or Cellmic C 121, and weight part is: 3 parts.
4. natural rubber foam material according to claim 1, it is characterized in that: promotor is tetramethyl thiuram disulfide or thiol benzothiazole, weight part is 3 parts.
5. the preparation method of natural rubber foam material according to claim 1: it is characterized in that it comprises the steps:
Step 1, batching: in the component proportion scope, select each component parts and configure material;
Step 2, kneading: at ambient temperature, the natural rubber that configures is put into milling machine kneading to Wei Shi plasticity number make its value reach 0.5-0.8, obtain rubber A;
Step 3, mixing: step 2 the rubber A that obtains and the elastomerics that configures are mixed in torque rheometer, mixing temperature is 80 ℃, rotating speed is 60 rev/mins, time 10-20 minute, obtain rubber unvulcanizate B, add successively in order toughener, promotor, frothing aid, whipping agent, linking agent and vulcanizing agent, kneading is even in milling machine, after mixing under 23 ℃ of conditions kneading obtain rubber unvulcanizate C to plasticity number 0.5-0.8;
Step 4, open refining: with rubber unvulcanizate C thin-pass 3-5 time in mill, then roll spacing is that thickness is the film of 3-3.5mm with mill with its calendering less than 1mm, the cutting work in-process that are shaped to get;
Step 5, moulding: work in-process are put into mould, when hot pressing temperature is 150 ℃, hot-pressing and foaming moulding in vulcanizing press, curing time is 10min, pressure is 10MPa.
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN104983117A (en) * 2013-12-27 2015-10-21 石狮蚂蚁城鞋服有限公司 Disinfection and deodorization 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
WO2020011002A1 (en) * 2018-07-13 2020-01-16 杭州星庐科技有限公司 Rubber composition, processing method therefor, rubber product using rubber composition, and production method therefor
CN110713646A (en) * 2018-07-13 2020-01-21 杭州星庐科技有限公司 Rubber composition and tire using the same
WO2023114907A1 (en) * 2021-12-15 2023-06-22 Bridgestone Americas Tire Operations, Llc Cellular natural rubber articles

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN104983117A (en) * 2013-12-27 2015-10-21 石狮蚂蚁城鞋服有限公司 Disinfection and deodorization 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
WO2020011002A1 (en) * 2018-07-13 2020-01-16 杭州星庐科技有限公司 Rubber composition, processing method therefor, rubber product using rubber composition, and production method therefor
CN110713658A (en) * 2018-07-13 2020-01-21 杭州星庐科技有限公司 Rubber composition and processing method, and rubber product and production method using the same
CN110713646A (en) * 2018-07-13 2020-01-21 杭州星庐科技有限公司 Rubber composition and tire using the same
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
WO2023114907A1 (en) * 2021-12-15 2023-06-22 Bridgestone Americas Tire Operations, Llc Cellular natural rubber articles

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