CN102690519A - Continuous silicon rubber foam plate with low compression stress relaxation and preparation method of continuous silicon rubber foam plate - Google Patents
Continuous silicon rubber foam plate with low compression stress relaxation and preparation method of continuous silicon rubber foam plate Download PDFInfo
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- CN102690519A CN102690519A CN2012102011887A CN201210201188A CN102690519A CN 102690519 A CN102690519 A CN 102690519A CN 2012102011887 A CN2012102011887 A CN 2012102011887A CN 201210201188 A CN201210201188 A CN 201210201188A CN 102690519 A CN102690519 A CN 102690519A
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Abstract
The invention provides a continuous silicon rubber foam plate with low compression stress relaxation and a preparation method of the continuous silicon rubber foam plate. The problems that production of the continuous silicon rubber foam plate cannot be realized by using the traditional die pressing method and the continuous silicon rubber foam plate with a smooth surface cannot be obtained by using an extrusion-hot air vulcanizing and foaming method are solved. The preparation method of the continuous silicon rubber foam plate is characterized by comprising the following steps of: adding 100 parts of silicon rubber, 1-3 parts of vulcanization systems, 2-8 parts of foaming systems, 10-50 parts of reinforcing agent and 1-5 parts of structural control agent into an internal mixer to uniformly mix at room temperature; then, adding a rubber compound into a silicon rubber extruder to obtain a flat-like rubber blank with required width and thickness through a die; and finally, introducing the flat-like continuous rubber blank into a salt bath vulcanization tank to vulcanize and foam, wherein the salt bath temperature is controlled at 135-180 DEG C, and the vulcanizing and foaming time is controlled within 3-5min. The continuous silicon rubber foam plate has the characteristics of high production efficiency, uniform heating and vulcanizing temperature, good surface level, uniform and small cells and low compression stress relaxation so as to have huge application prospect when being used as sealing, sound insulating, heat insulating, locating and damping materials in special severe environments such as transportation, petrochemical industry, electronic industry and aerospace.
Description
Technical field
The present invention relates to continuous sheet material of a kind of low stress under compression relaxed silicon rubbery foam and preparation method thereof, belong to field of high polymer material processing.
Background technology
Porous hot-vulcanized silicone rubber foam materials is a kind of porous visco-elasticity macromolecular material of being processed through foaming by Zylox; It not only has light weight, specific tenacity height, compressive characteristics, sound insulation and the performances such as good, anti-high energy impact of heat-proof quality and vibration damping of conventional polymeric foamed material; Also has the good high and low temperature resistance of Zylox; Be widely used in the sealing under the special severe rugged environment in fields such as communications and transportation, petrochemical complex, electronic industry and aerospace; Sound insulation, heat insulation, location and vibration damping etc.; Silicon rubber foam sheet material wherein (silicon rubber foam material after the section) is specially adapted to the course of precision parts in aerospace industry, national defence tip and other department of national economy, plays the effect of location, vibration damping.
The preparation method of silicon rubber foam material is different according to the pore former that is adopted, and mainly can be divided into two types of chemical blowing process, physical blowing methods (containing the dissolved foaming).The physical blowing method can be divided into two kinds because of the difference of pore former: the one, and with rare gas element (N
2Or CO
2) under high pressure join and treat in the foamed material or low-boiling point liquid (like alkane, chloride fluorocarbon) adds and treats in the foamed material, gas is separated out maybe will evaporate through heating, step-down then, make material foaming [Song Lixian; Lu Zhongyuan, Feng Peijie, Lu Ai; Kang Ming; Song Kaiping, a kind of super critical CO 2 technology prepares the method for silicon rubber foam material, application number 201010509638.X].Second method is the particle leaching method, when materials processed, adds a kind of inorganic pore former of soluble in water or organic solvent, after compression molding; Again will this inorganic pore former separate out and obtain the working method of foam materials, wash out particle with the solvent that is dissolved in this particulate material behind the material forming, stay micropore [Huang Yuhong in particle position; Hu Wenjun; Zhou Dehui, high-performance foam rubber and method of manufacture thereof, application number 01107132.X].In the physical method first kind exists that gas generation agent adds and difficulty such as dispersion in rubber matrix, be difficult to make the foam materials that performance meets the demands.Also there are disadvantages such as the pore-forming particle is not easy to clean, working (machining) efficiency is low and be equipped with the rubber poromerics with the particle leaching legal system.In addition; Chinese patent CN1850908A adopts
ray to replace superoxide that silicon rubber foam material is carried out radiation crosslinking; Its technological process is more loaded down with trivial details; Preparation cycle is longer; And there is difference in
ray to the radiation of silicon rubber foam different depths, and then has influence on the homogeneity of crosslinking degree.
In existing document and patent, all do not relate to lax continuous sheet material of hot-vulcanized silicone rubber foam of low stress under compression and preparation method thereof.Existing preparation processing about silicon rubber foam material mainly concentrates on the employing compression molding or extrudes-the hot-air vulcanization foaming; The former production efficiency is lower; Can not realize the production (satisfying under the specific occasion needs) of the continuous sheet material of silicon rubber foam, and the compression stress relaxation performance of foam materials does not reach requirement yet to the continuous sheet material of random length; And the latter is mainly used in the production of non-flat board-like materials such as silicon rubber foam sealed strip because hot-air heated directivity and ununiformity are obvious, the continuous sheet material of silicon rubber foam that can not obtain surfacing.
Summary of the invention
To the deficiency that exists in the above prior art; The purpose of this invention is to provide a kind of have low stress under compression relaxation property, continuous sheet material of silicon rubber foam that profile pattern is good and preparation method thereof, be characterized in adopting mill or Banbury mixer at room temperature with the prescription of Zylox form mixing evenly.Then rubber unvulcanizate is joined in the Zylox forcing machine, obtain the plate shaped continuous glue embryo of required width and gauge, prepare the continuous sheet material of silicon rubber foam through the salt bath vulcanization foaming through the rectangular opening mould.
For realizing above purpose, technical scheme of the present invention provides continuous sheet material of a kind of low stress under compression relaxed silicon rubbery foam and preparation method thereof, it is characterized in that it is made up of following composition by weight ratio:
100 parts in Zylox, 1～3 part of vulcanization system, 2～8 parts of foaming systems, 10～50 parts of strengthening agents, 1～5 part of antistructurizing agent.
Described Zylox is at least a in dimethyl silicone rubber, methyl vinyl silicone rubber, the methyl phenyl vinyl silicone rubber.
Described vulcanization system comprises Di Cumyl Peroxide 99 (DCP), Lucidol (BPO), 2; 5-dimethyl--2, at least a additional crosslinker at least a vulcanizing agent in the 5-di-t-butyl peroxy hexane (DBPMH) or trimethylolpropane trimethacrylate (TMPTMA), cyanacrylate (TAIC) and the triallylcyanurate (TAC).
Described foaming system comprises at least a at least a or blowing promotor Zinic stearas (ZnSt), zinc oxide (ZnO) and the urea fat (BK) among Cellmic C 121 (AC), dinitrosopentamethylene tetramine (H) and the AK.
Described strengthening agent is at least a in the thermal silica.
Described constitution controller is at least a in hydroxy silicon oil, octamethylcyclotetrasiloxane, hexamethyldisilazane or the silane coupling agent.
Preparing method of the present invention is following:
(1) the employing mill of prescription composition or the Banbury mixer of silicon rubber foam sheet material is at room temperature mixing evenly;
(2) rubber unvulcanizate is joined in the Zylox forcing machine, obtain the plate shaped glue embryo of required width and gauge through the rectangular opening mould;
(3) with carrying out sulfur foam in the plate shaped continuous glue embryo feeding salt bath vulcanization groove, salt temperature is controlled at 135～180 ℃, 3～5 minutes sulfur foam time.
Advantage of the present invention is that production efficiency is high, and the temperature of its baking is even, and the continuous sheet material of gained silicon rubber foam has that profile pattern is good, abscess is more evenly tiny and compression stress relaxation is low.
Description of drawings
Fig. 1 is the cell morphology SEM photo of compression molding silicon rubber foam sheet material.
Fig. 2 prepares the cell morphology SEM photo of gained silicon rubber foam sheet material for the present invention.
Can find out from the cell morphology SEM photo that hangs down stress under compression relaxed silicon rubbery foam sheet material that compression molding shown in Figure 1 prepares; The abscess of compression molding silicon rubber foam sheet material is big, skewness and abscess are less, and that the present invention prepares the abscess of gained silicon rubber foam sheet material is less and more even distribution is tiny.
Embodiment
Following examples are that technical scheme of the present invention is described further, rather than limit scope of the present invention.
The composition weight proportioning (part) of continuous each embodiment of sheet material of table 1 silicon rubber foam.
| ? | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 |
| Zylox | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Silicon-dioxide | 20 | 20 | 20 | 20 | 30 | 40 | 50 |
| Antistructurizing agent | ? | ? | ? | ? | 3 | 4 | 5 |
| BPO/AK | 1/4 | ? | ? | ? | ? | ? | ? |
| DBPMH/AC | ? | 1/4 | ? | ? | ? | ? | ? |
| DCP/H/BK | ? | ? | 1/4/3 | 1/4/3 | 1/4/3 | 1/4/3 | 1/4/3 |
| Additional crosslinker | ? | ? | ? | 0.5 | 0.5 | 0.5 | 0.5 |
Embodiment 1
Press each composition weight proportioning in table 1 prescription; In Banbury mixer, add methyl vinyl silicone rubber, fumed silica, AK whipping agent, Lucidol (BPO) successively; Under the room temperature mixing 30 minutes; Then the rubber unvulcanizate that mixes is added in the Zylox forcing machine, the through port mould obtains the plate shaped glue embryo of required width and gauge.At last plate shaped continuous glue embryo is fed in the salt bath vulcanization groove and carry out sulfur foam, salt temperature is controlled at 140～145 ℃, 3～5 minutes sulfur foam time.
Embodiment 2
Press each composition weight proportioning in table 1 prescription; In Banbury mixer, add methyl vinyl silicone rubber, fumed silica, AC whipping agent, 2 successively; 5-dimethyl--2,5-di-t-butyl peroxy hexane (DBPMH), under the room temperature mixing 30 minutes; Then the rubber unvulcanizate that mixes is added in the Zylox forcing machine, the through port mould obtains the plate shaped glue embryo of required width and gauge.At last plate shaped continuous glue embryo is fed in the salt bath vulcanization groove and carry out sulfur foam, salt temperature is controlled at 173～178 ℃, 3～5 minutes sulfur foam time.
Embodiment 3～7
Press each composition weight proportioning in table 1 prescription; In Banbury mixer, add methyl vinyl silicone rubber, fumed silica, H whipping agent, Di Cumyl Peroxide 99 (DCP) and additional crosslinker successively; Under the room temperature mixing 30 minutes; Then the rubber unvulcanizate that mixes is added in the Zylox forcing machine, the through port mould obtains the plate shaped glue embryo of required width and gauge.At last plate shaped continuous glue embryo is fed in the salt bath vulcanization groove and carry out sulfur foam, salt temperature is controlled at 160～165 ℃, 3～5 minutes sulfur foam time.
The The performance test results of continuous each embodiment of sheet material of table 2 silicon rubber foam
| ? | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 |
| Density/g.cm -3 | 0.42 | 0.45 | 0.46 | 0.43 | 0.47 | 0.52 | 0.59 |
| Tensile strength/MPa | 0.36 | 0.38 | 0.39 | 0.37 | 0.40 | 0.44 | 0.64 |
| Elongation at break/% | 167 | 178 | 175 | 161 | 172 | 183 | 226 |
| Compressive strength/MPa | 0.31 | 0.36 | 0.37 | 0.34 | 0.39 | 0.40 | 0.42 |
| Compression stress relaxation/% | 11.8 | 10.9 | 9.4 | 8.3 | 7.2 | 6.8 | 10.1 |
Can find out that from table 2 the compression stress relaxation performance of DCP/H sulfur foam system is superior to DBPMH/AC and BPO/AK system, add the compression stress relaxation performance that an amount of additional crosslinker helps further to reduce silicon rubber foam sheet material.On this basis, as fumed silica (SiO
2) content is in the time of 40 parts, the compression stress relaxation performance of the continuous sheet material of DCP/H/BK/ additional crosslinker sulfur foam Zylox is minimum, reaches 6.8%.
Claims (8)
1. one kind low continuous sheet material of stress under compression relaxed silicon rubbery foam it is characterized in that this silicon rubber foam sheet material can satisfy under the specific occasion needs to the continuous sheet material of random length, and the planarization of sheet material is good.
2. according to the continuous sheet material of a kind of low stress under compression relaxed silicon rubbery foam described in the claim 1; The prescription composition that it is characterized in that this silicon rubber foam sheet material is by weight: 100 parts in Zylox; 1～3 part of vulcanization system, 2～8 parts of foaming systems, 1～5 part of 10～50 parts of strengthening agents and antistructurizing agent; The continuous sheet material of this foam was pressed 10 minutes earlier when bearing 40% compressive strain; Carry out compression stress relaxation in 180 minutes test again, its compressive strength is 0.25～0.45MPa, and compression stress relaxation is less than 12%.
3. according to the continuous sheet material of a kind of low stress under compression relaxed silicon rubbery foam described in the claim 2, it is characterized in that: Zylox is at least a in dimethyl silicone rubber, methyl vinyl silicone rubber, the methyl phenyl vinyl silicone rubber.
4. according to the continuous sheet material of a kind of low stress under compression relaxed silicon rubbery foam described in the claim 2; It is characterized in that: vulcanization system comprises Di Cumyl Peroxide 99 (DCP), Lucidol (BPO), 2; 5-dimethyl--2, at least a additional crosslinker at least a vulcanizing agent in the 5-di-t-butyl peroxy hexane (DBPMH) or trimethylolpropane trimethacrylate (TMPTMA), cyanacrylate (TAIC) and the triallylcyanurate (TAC).
5. according to the continuous sheet material of a kind of low stress under compression relaxed silicon rubbery foam described in the claim 2, it is characterized in that: foaming system comprises at least a at least a or blowing promotor Zinic stearas (ZnSt), zinc oxide (ZnO) and the urea fat (BK) among Cellmic C 121 (AC), dinitrosopentamethylene tetramine (H), the AK.
6. according to the continuous sheet material of a kind of low stress under compression relaxed silicon rubbery foam described in the claim 2, it is characterized in that: strengthening agent is at least a in the thermal silica.
7. according to the continuous sheet material of a kind of low stress under compression relaxed silicon rubbery foam described in the claim 2, it is characterized in that: constitution controller is at least a in hydroxy silicon oil, octamethylcyclotetrasiloxane, hexamethyldisilazane or the silane coupling agent.
8. the preparation method of the one kind low continuous sheet material of stress under compression relaxed silicon rubbery foam; It is characterized in that: the employing mill of prescription composition or the Banbury mixer of the sheet material of silicon rubber foam described in the claim 2 is at room temperature mixing evenly; Then rubber unvulcanizate is joined in the Zylox forcing machine; Obtain the plate shaped glue embryo of required width and gauge through the rectangular opening mould; At last plate shaped continuous glue embryo is fed in the salt bath vulcanization groove and carry out sulfur foam, salt temperature is controlled at 135～175 ℃, 3～5 minutes sulfur foam time.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104312168A (en) * | 2014-11-07 | 2015-01-28 | 中蓝晨光化工研究设计院有限公司 | Porous liquid room temperature vulcanization foam silicone rubber and preparation method thereof |
| CN105001644A (en) * | 2015-07-22 | 2015-10-28 | 上海交通大学 | Porous elastic film and preparation method thereof |
| CN105017774A (en) * | 2015-05-21 | 2015-11-04 | 蚌埠市耀得保温容器有限公司 | Environmentally friendly heat and aging resistant thermos flask and preparation method for sealing sleeve thereof |
| CN105330985A (en) * | 2015-11-12 | 2016-02-17 | 浙江百纳橡塑设备有限公司 | Salt bath vulcanization technology for ethylene propylene diene monomer foamed profile |
| CN105907103A (en) * | 2016-06-23 | 2016-08-31 | 中国科学院化学研究所 | Silicone rubber foam material and preparation method thereof |
| CN106349709A (en) * | 2016-08-24 | 2017-01-25 | 江苏天辰新材料股份有限公司 | Low-density microcellular foaming silicone rubber and preparation method thereof |
| CN106432924B (en) * | 2016-09-29 | 2018-09-25 | 中国工程物理研究院化工材料研究所 | A kind of microcellular rubber foamed material of compression stress relaxation performance improvement and preparation method thereof |
| CN113024875A (en) * | 2021-04-16 | 2021-06-25 | 谭伟泉 | Preparation method of long-length-unlimited high-temperature-resistant foamed silicone rubber film (plate) |
| CN114196214A (en) * | 2022-01-06 | 2022-03-18 | 株洲时代新材料科技股份有限公司 | Silicone rubber foamed sealing material and preparation method thereof |
| CN114410117A (en) * | 2021-12-31 | 2022-04-29 | 北京北化新橡特种材料科技股份有限公司 | Preparation method of environment-friendly silicon rubber sports floor |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104312168A (en) * | 2014-11-07 | 2015-01-28 | 中蓝晨光化工研究设计院有限公司 | Porous liquid room temperature vulcanization foam silicone rubber and preparation method thereof |
| CN104312168B (en) * | 2014-11-07 | 2017-06-13 | 中蓝晨光化工研究设计院有限公司 | A kind of open cell type liquid RTV foam silicone rubber and preparation method thereof |
| CN105017774A (en) * | 2015-05-21 | 2015-11-04 | 蚌埠市耀得保温容器有限公司 | Environmentally friendly heat and aging resistant thermos flask and preparation method for sealing sleeve thereof |
| CN105001644A (en) * | 2015-07-22 | 2015-10-28 | 上海交通大学 | Porous elastic film and preparation method thereof |
| CN105330985A (en) * | 2015-11-12 | 2016-02-17 | 浙江百纳橡塑设备有限公司 | Salt bath vulcanization technology for ethylene propylene diene monomer foamed profile |
| CN105907103A (en) * | 2016-06-23 | 2016-08-31 | 中国科学院化学研究所 | Silicone rubber foam material and preparation method thereof |
| CN106349709A (en) * | 2016-08-24 | 2017-01-25 | 江苏天辰新材料股份有限公司 | Low-density microcellular foaming silicone rubber and preparation method thereof |
| CN106432924B (en) * | 2016-09-29 | 2018-09-25 | 中国工程物理研究院化工材料研究所 | A kind of microcellular rubber foamed material of compression stress relaxation performance improvement and preparation method thereof |
| CN113024875A (en) * | 2021-04-16 | 2021-06-25 | 谭伟泉 | Preparation method of long-length-unlimited high-temperature-resistant foamed silicone rubber film (plate) |
| CN114410117A (en) * | 2021-12-31 | 2022-04-29 | 北京北化新橡特种材料科技股份有限公司 | Preparation method of environment-friendly silicon rubber sports floor |
| CN114196214A (en) * | 2022-01-06 | 2022-03-18 | 株洲时代新材料科技股份有限公司 | Silicone rubber foamed sealing material and preparation method thereof |
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Application publication date: 20120926 |