CN108948455A - A kind of isoprene rubber/butadiene-styrene rubber composite transformer gasket and preparation method thereof - Google Patents
A kind of isoprene rubber/butadiene-styrene rubber composite transformer gasket and preparation method thereof Download PDFInfo
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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
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
- C08B37/0024—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid beta-D-Glucans; (beta-1,3)-D-Glucans, e.g. paramylon, coriolan, sclerotan, pachyman, callose, scleroglucan, schizophyllan, laminaran, lentinan or curdlan; (beta-1,6)-D-Glucans, e.g. pustulan; (beta-1,4)-D-Glucans; (beta-1,3)(beta-1,4)-D-Glucans, e.g. lichenan; Derivatives thereof
- C08B37/0027—2-Acetamido-2-deoxy-beta-glucans; Derivatives thereof
- C08B37/003—Chitin, i.e. 2-acetamido-2-deoxy-(beta-1,4)-D-glucan or N-acetyl-beta-1,4-D-glucosamine; Chitosan, i.e. deacetylated product of chitin or (beta-1,4)-D-glucosamine; Derivatives thereof
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- 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
- C08K2003/221—Oxides; Hydroxides of metals of rare earth metal
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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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
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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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
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
-
- 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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- 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
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
Abstract
The present invention provides a kind of isoprene rubber/butadiene-styrene rubber composite transformer gaskets and preparation method thereof, the preparation method includes: 1) chitosan is successively passed through to acid soak, is impregnated then in turn through alkyl benzene sulphonate sodium solution and alkyl naphthalene sulfonic acid sodium solution to obtain modification of chitosan；2) at 145-175 DEG C, isoprene rubber, butadiene-styrene rubber, carbon black, sulphur and modification of chitosan are subjected to first vulcanization so that the first mixture is made；3) at 175-185 DEG C, the first mixture, oxide nano rare earth, polyester fiber, vulcanizing agent is subjected to post-cure and handle obtained transformer sealing gasket.Isoprene rubber of the present invention/butadiene-styrene rubber composite transformer gasket has excellent mechanical property and anti-aging property.
Description
Original bill application number: 2017104442160.
The original bill applying date: on June 13rd, 2017.
Technical field
The present invention relates to transformer sealing elements, and in particular, to a kind of isoprene rubber/butadiene-styrene rubber composite transformer sealing
Pad and preparation method thereof.
Background technique
Gasket is an important part of oil-immersed transformer, plays the role of sealing, prevents transformer oil leak.It is existing
Some rubber gaskets are caused transformer leakage of oil, have been seriously affected transformation due to its unstable mechanical property or easy to aging
The service life of device causes huge economic loss to electric system and user.
Summary of the invention
The object of the present invention is to provide a kind of isoprene rubber/butadiene-styrene rubber composite transformer gasket and preparation method thereof,
The isoprene rubber/butadiene-styrene rubber composite transformer gasket has excellent mechanical property and anti-aging property, and the preparation
Method has the advantages that process is simple and raw material is easy to get.
To achieve the goals above, the present invention provides a kind of isoprene rubber/butadiene-styrene rubber composite transformer gaskets
Preparation method, comprising:
1) chitosan is successively passed through to acid soak, then in turn through alkyl benzene sulphonate sodium solution and alkyl naphthalene sulfonic acid sodium solution
It is impregnated to obtain modification of chitosan；
2) at 145-175 DEG C, isoprene rubber, butadiene-styrene rubber, carbon black, sulphur and modification of chitosan are subjected to first vulcanization to make
Obtain the first mixture；
3) at 175-185 DEG C, the first mixture, oxide nano rare earth, polyester fiber, vulcanizing agent are carried out at post-cure
It manages and transformer sealing gasket is made.
The present invention also provides a kind of isoprene rubber/butadiene-styrene rubber composite transformer gasket, the isoprene rubbers/butylbenzene rubber
Glue composite transformer gasket is prepared by above-mentioned preparation method.
In the above-mentioned technical solutions, the present invention is first by successively carrying out acid solution, sodium alkyl benzene sulfonate and alkane to chitosan
Base sodium naphthalene sulfonate is modified and then obtains modification of chitosan, then passes through isoprene rubber, butadiene-styrene rubber, carbon black, sulphur and modified shell
Glycan carries out first vulcanization so that the first mixture is made, then by the first mixture, oxide nano rare earth, polyester fiber,
Vulcanizing agent carries out post-cure and handles obtained transformer sealing gasket.The transformer sealing gasket has excellent mechanical property and anti-ageing
Change performance, and the preparation method has the advantages that process is simple and raw material is easy to get.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Specific embodiment
Detailed description of the preferred embodiments below.It should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The present invention provides a kind of isoprene rubber/butadiene-styrene rubber composite transformer gasket preparation methods, comprising:
1) chitosan is successively passed through to acid soak, then in turn through alkyl benzene sulphonate sodium solution and alkyl naphthalene sulfonic acid sodium solution
It is impregnated to obtain modification of chitosan；
2) at 145-175 DEG C, isoprene rubber, butadiene-styrene rubber, carbon black, sulphur and modification of chitosan are subjected to first vulcanization to make
Obtain the first mixture；
3) at 175-185 DEG C, the first mixture, oxide nano rare earth, polyester fiber, vulcanizing agent are carried out at post-cure
It manages and transformer sealing gasket is made.
In step 1) of the invention, the dosage and concentration of each material can select in a wide range, but in order to
Make transformer sealing gasket obtained that there is superior mechanical property and anti-aging property, it is preferable that in step 1), relative to
The dosage of the chitosan of 100 parts by weight, acid solution, alkyl benzene sulphonate sodium solution and alkyl naphthalene sulfonic acid sodium solution is each independently
200-300 parts by weight；Also, the pH of acid solution is 5-6, and the concentration of alkyl benzene sulphonate sodium solution and alkyl naphthalene sulfonic acid sodium solution is respectively
It independently is 20-30 weight %.
In step 1) of the invention, the specific type of sodium alkyl benzene sulfonate and Negel can be in wide model
Interior selection is enclosed, but in order to make transformer sealing gasket obtained that there is superior mechanical property and anti-aging property, it is preferable that
Sodium alkyl benzene sulfonate is cetyl benzenesulfonic acid sodium, neopelex or octadecyl benzene in alkyl benzene sulphonate sodium solution
Sodium sulfonate；Negel in alkyl naphthalene sulfonic acid sodium solution be cetyl sodium naphthalene sulfonate, dodecyl sodium naphthalene sulfonate or
Octadecyl sodium naphthalene sulfonate.
In step 1) of the invention, the actual conditions of immersion can select in a wide range, but in order to make to be made
Transformer sealing gasket there is superior mechanical property and anti-aging property, it is preferable that in step 1), the immersion of every step is full
Sufficient the following conditions: soaking temperature is 25-30 DEG C, soaking time 8-10h.
In step 2) of the invention, the dosage of each material can select in a wide range, but obtained in order to make
Transformer sealing gasket has superior mechanical property and anti-aging property, it is preferable that in step 2, isoprene rubber, butylbenzene
Rubber, carbon black, sulphur and modification of chitosan weight ratio be 100:45-60:10-17:5-8:40-48.
In step 2) of the invention, the time vulcanized for the first time can select in a wide range, but in order to make to be made
Transformer sealing gasket have superior mechanical property and anti-aging property, it is preferable that in step 2, vulcanize for the first time when
Between be 8-10h.
In step 2) of the invention, the molecular weight of isoprene rubber and butadiene-styrene rubber can select in a wide range,
But in order to make transformer sealing gasket obtained that there is superior mechanical property and anti-aging property, it is preferable that in step 2
In, the weight average molecular weight of isoprene rubber is 30,000-5 ten thousand, and the weight average molecular weight of butadiene-styrene rubber is 40,000-7 ten thousand.
In step 3) of the invention, the dosage of each material can select in a wide range, but obtained in order to make
Transformer sealing gasket has superior mechanical property and anti-aging property, it is preferable that in step 3), the first mixture is received
Rice rare earth oxide, polyester fiber, vulcanizing agent amount ratio be 100:2-2.8:7-10:1.5-4.
In step 3) of the invention, the time of post-cure can select in a wide range, but in order to make to be made
Transformer sealing gasket have superior mechanical property and anti-aging property, it is preferable that in step 3), post-cure when
Between be 3-5h.
In step 3) of the invention, the specific type of oxide nano rare earth can select in a wide range, still
In order to make transformer sealing gasket obtained that there is superior mechanical property and anti-aging property, it is preferable that in step 3), receive
Rice rare earth oxide is selected from least one of nano lanthanum oxide, nano oxidized praseodymium, nano oxidized gadolinium and nano oxidized dysprosium.
In step 3) of the invention, the partial size of oxide nano rare earth can select in a wide range, but in order to
Make transformer sealing gasket obtained that there is superior mechanical property and anti-aging property, it is preferable that oxide nano rare earth
Average grain diameter is 8-15nm.
In step 3) of the invention, the specific type of vulcanizing agent can select in a wide range, but in order to make to make
The transformer sealing gasket obtained has superior mechanical property and anti-aging property, it is preferable that vulcanizing agent is selected from tetraethyl
At least one of base thiuram, tetramethylthiuram disulfide and tetrabenzyl thiuram-disulfide.
The present invention also provides a kind of isoprene rubber/butadiene-styrene rubber composite transformer gasket, the isoprene rubbers/butylbenzene rubber
Glue composite transformer gasket is prepared by above-mentioned preparation method.
The present invention will be described in detail by way of examples below.
Embodiment 1
1) at 28 DEG C, the hydrochloric acid (pH 5.5) that the chitosan of 100 parts by weight successively passes through 250 parts by weight is impregnated into 9h, then
The successively alkyl benzene sulphonate sodium solution Jing Guo 250 parts by weight (concentration is 25 weight %, cetyl benzenesulfonic acid sodium solution) and 250
The alkyl naphthalene sulfonic acid sodium solution (concentration is 25 weight %, cetyl sodium naphthalene sulfonate solution) of parts by weight impregnate 9h to obtain
Modification of chitosan；
2) at 165 DEG C, by isoprene rubber (weight average molecular weight is 30,000-5 ten thousand), (weight average molecular weight is 40,000-7 to butadiene-styrene rubber
Ten thousand), carbon black, sulphur are mixed with modification of chitosan according to the first vulcanization 9h of 100:50:15:7:45 weight ratio progress with being made first
Object；
3) at 180 DEG C, the first mixture, oxide nano rare earth (nano lanthanum oxide, average grain diameter 10nm), terylene is fine
Dimension, vulcanizing agent carry out post-cure 4h according to the weight ratio of 100:2.4:8:3 and handle obtained transformer sealing gasket A1.
Embodiment 2
1) at 25 DEG C, by the chitosan of 100 parts by weight successively pass through 200 parts by weight hydrochloric acid (pH 5) impregnate 8h, then according to
Secondary alkyl benzene sulphonate sodium solution (concentration is 20 weight %, neopelex solution) and 200 weights Jing Guo 200 parts by weight
The alkyl naphthalene sulfonic acid sodium solution (concentration is 20 weight %, dodecyl sodium naphthalene sulfonate solution) for measuring part impregnate 8h to be changed
Property chitosan；
2) at 145 DEG C, by isoprene rubber (weight average molecular weight is 30,000-5 ten thousand), (weight average molecular weight is 40,000-7 to butadiene-styrene rubber
Ten thousand), carbon black, sulphur are mixed with modification of chitosan according to the first vulcanization 8h of 100:45:10:5:40 weight ratio progress with being made first
Object；
3) it at 175-185 DEG C, by the first mixture, oxide nano rare earth (nano oxidized praseodymium, average grain diameter 8nm), washs
Synthetic fibre fiber, vulcanizing agent carry out post-cure 3h according to the weight ratio of 100:2:7:1.5 and handle obtained transformer sealing gasket A2.
Embodiment 3
1) at 30 DEG C, the hydrochloric acid (pH 6) that the chitosan of 100 parts by weight successively passes through 300 parts by weight is impregnated into 10h, then
Successively the alkyl benzene sulphonate sodium solution Jing Guo 300 parts by weight (concentration is 30 weight %, octadecyl benzenesulfonic acid sodium solution) and 200-
The alkyl naphthalene sulfonic acid sodium solution (concentration be 30 weight %, octadecyl sodium naphthalene sulfonate solution) of 300 parts by weight impregnate 10h with
Obtain modification of chitosan；
2) at 175 DEG C, by isoprene rubber (weight average molecular weight is 30,000-5 ten thousand), (weight average molecular weight is 40,000-7 to butadiene-styrene rubber
Ten thousand), carbon black, sulphur and modification of chitosan are mixed to be made first according to the first vulcanization 10h of 100:60:17:8:48 weight ratio progress
Close object；
3) at 185 DEG C, by the first mixture, oxide nano rare earth (nano oxidized dysprosium, average grain diameter 8-15nm), terylene
Fiber, vulcanizing agent carry out post-cure 5h according to the weight ratio of 100:2.8:10:4 and handle obtained transformer sealing gasket A3.
Comparative example 1
It carries out that transformer sealing gasket B1 is made according to the method for embodiment 1, unlike, acid soak is not used in step 1).
Comparative example 2
It carries out that transformer sealing gasket B2 is made according to the method for embodiment 1, unlike, alkyl benzene sulphonate is not used in step 1)
Sodium solution.
Comparative example 3
It carries out that transformer sealing gasket B3 is made according to the method for embodiment 1, unlike, alkyl naphthalene sulfonic acid is not used in step 1)
Sodium solution.
Comparative example 4
It carries out that transformer sealing gasket B4 is made according to the method for embodiment 1, unlike, acid solution and alkyl are not used in step 1)
Benzene sulfonic acid sodium salt solution.
Comparative example 5
It carries out that transformer sealing gasket B5 is made according to the method for embodiment 1, unlike, acid solution and alkyl are not used in step 1)
Naphthoic acid sodium solution.
Detect example 1
Detect the tensile strength and anti-aging property (leaching 25# transformer oil compressive deformation/%, tolerance of above-mentioned transformer sealing gasket
25# transformer oil compression performance, the testing conditions of leaching 25# transformer oil compressive deformation are compression 25%, 125 DEG C and 168h, are resistant to
The testing conditions of 25# transformer oil compression performance are 125 DEG C and 168h), specific testing result is shown in Table 1.
Table 1
| Tensile strength/MPa | Soak 25# transformer oil compressive deformation/% | It is resistant to 25# transformer oil compression performance, volume change/% | |
| A1 | 39.2 | 13.1 | 2.9 |
| A2 | 38.9 | 12.6 | 2.7 |
| A3 | 39.0 | 13.0 | 2.6 |
| B1 | 27.7 | 20.1 | 3.2 |
| B2 | 26.9 | 21.7 | 3.3 |
| B3 | 28.0 | 22.0 | 3.0 |
| B4 | 16.5 | 36.3 | 5.2 |
| B5 | 14.9 | 34.1 | 6.8 |
Through the foregoing embodiment, comparative example and detection example are it is found that transformer sealing gasket provided by the invention has excellent stretching
Intensity and anti-aging property.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail within the scope of the technical concept of the present invention can be with various simple variants of the technical solution of the present invention are made, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (9)
1. a kind of isoprene rubber/butadiene-styrene rubber composite transformer gasket preparation method characterized by comprising
1) chitosan is successively passed through to acid soak, then in turn through alkyl benzene sulphonate sodium solution and alkyl naphthalene sulfonic acid sodium solution
It is impregnated to obtain modification of chitosan；
2) at 145-175 DEG C, isoprene rubber, butadiene-styrene rubber, carbon black, sulphur and modification of chitosan are subjected to first vulcanization to make
Obtain the first mixture；
3) at 175-185 DEG C, first mixture, oxide nano rare earth, polyester fiber, vulcanizing agent are subjected to secondary sulphur
Change to handle and transformer sealing gasket is made；
In step 1), the immersion of every step meets the following conditions: soaking temperature is 25-30 DEG C, soaking time 8-10h；
In step 2, the weight average molecular weight of the isoprene rubber is 30,000-5 ten thousand, and the weight average molecular weight of the butadiene-styrene rubber is 4
Ten thousand -7 ten thousand；
In step 3), the oxide nano rare earth is selected from nano lanthanum oxide, nano oxidized praseodymium, nano oxidized gadolinium and nano oxygen
Change at least one of dysprosium；The average grain diameter of the oxide nano rare earth is 8-15nm.
2. preparation method according to claim 1, wherein in step 1), the shell relative to 100 parts by weight is poly-
Sugar, the dosage of the acid solution, alkyl benzene sulphonate sodium solution and alkyl naphthalene sulfonic acid sodium solution are each independently 200-300 weight
Part；Also, the pH of the acid solution is 5-6, and the concentration of the alkyl benzene sulphonate sodium solution and alkyl naphthalene sulfonic acid sodium solution is respectively only
It is on the spot 20-30 weight %.
3. preparation method according to claim 1, wherein in step 1), alkyl in the alkyl benzene sulphonate sodium solution
Benzene sulfonic acid sodium salt is cetyl benzenesulfonic acid sodium, neopelex or octadecyl benzenesulfonic acid sodium；The alkyl naphthalene sulfonic acid
Negel in sodium solution is cetyl sodium naphthalene sulfonate, dodecyl sodium naphthalene sulfonate or octadecyl sodium naphthalene sulfonate.
4. preparation method described in any one of -3 according to claim 1, wherein in step 2, the isoprene rubber, fourth
Benzene rubber, carbon black, sulphur and modification of chitosan weight ratio be 100:45-60:10-17:5-8:40-48.
5. preparation method according to claim 1, wherein in step 2, the time vulcanized for the first time is 8-10h.
6. preparation method according to claim 1, wherein in step 3), first mixture, nano rare earth oxidation
Object, polyester fiber, vulcanizing agent amount ratio be 100:2-2.8:7-10:1.5-4.
7. preparation method according to claim 1, wherein in step 3), the time of the post-cure is 3-5h.
8. preparation method according to claim 1 or 6, wherein in step 3), the vulcanizing agent is selected from tetraethyl
At least one of base thiuram, tetramethylthiuram disulfide and tetrabenzyl thiuram-disulfide.
9. a kind of isoprene rubber/butadiene-styrene rubber composite transformer gasket, which is characterized in that the isoprene rubber/butadiene-styrene rubber
Composite transformer gasket is prepared by preparation method described in any one of claim 1-8.
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| CN201810860078.9A CN108948455A (en) | 2017-06-13 | 2017-06-13 | A kind of isoprene rubber/butadiene-styrene rubber composite transformer gasket and preparation method thereof |
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| CN201810860078.9A CN108948455A (en) | 2017-06-13 | 2017-06-13 | A kind of isoprene rubber/butadiene-styrene rubber composite transformer gasket and preparation method thereof |
| CN201710444216.0A CN107236159B (en) | 2017-06-13 | 2017-06-13 | Isoprene rubber/butadiene-styrene rubber composite transformer gasket and preparation method thereof |
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| CN201810860033.1A Withdrawn CN108948454A (en) | 2017-06-13 | 2017-06-13 | Isoprene rubber/butadiene-styrene rubber composite transformer gasket and preparation method thereof |
| CN201810860032.7A Withdrawn CN108948453A (en) | 2017-06-13 | 2017-06-13 | A kind of isoprene rubber/butadiene-styrene rubber composite transformer gasket and preparation method thereof |
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| BRPI0418359A (en) * | 2004-01-06 | 2007-05-08 | Univ Sherbrooke | Simplified Method To Recover Chitosan From Its Acid Solutions |
| CN104927125A (en) * | 2015-06-08 | 2015-09-23 | 东至群盛化工设备有限公司 | Flange sealing gasket for chemical sewage pipe connection |
| CN105199172A (en) * | 2015-10-19 | 2015-12-30 | 青岛科技大学 | Composite rubber reinforcing system, styrene butadiene rubber using reinforcing system and preparation method of styrene butadiene rubber |
| CN105622847B (en) * | 2016-03-21 | 2018-08-17 | 南京工业大学 | A kind of synthetic method of water soluble chitosan-based flocculant and its application |
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| CN107236159B (en) | 2018-10-02 |
| CN107236159A (en) | 2017-10-10 |
| CN108948454A (en) | 2018-12-07 |
| CN108948453A (en) | 2018-12-07 |
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