CN109280510A - A kind of low air penetrability butyl sealant - Google Patents
A kind of low air penetrability butyl sealant Download PDFInfo
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- CN109280510A CN109280510A CN201811042805.7A CN201811042805A CN109280510A CN 109280510 A CN109280510 A CN 109280510A CN 201811042805 A CN201811042805 A CN 201811042805A CN 109280510 A CN109280510 A CN 109280510A
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- parts
- resin
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J107/00—Adhesives based on natural rubber
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
-
- 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
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- 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
-
- 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
Abstract
The present invention provides a kind of low air penetrability butyl sealant, is related to sealant processing technique field.The low air penetrability butyl sealant is made of raw material from the following weight: 25-35 parts of butyl rubber, 30-40 parts of natural rubber, 10-20 parts of rosin resin, 6-10 parts of ancient marlon resin, 4-6 parts of zinc oxide, 3-5 parts of magnesia, 90-110 parts of dimethylbenzene, 25-35 parts of polymethyl methacrylate resin, 50-60 parts of Paris white.The present invention overcomes the deficiencies in the prior art, improve the airtightness of traditional butyl sealant, reduce the rate that is passed through of air, and the present invention has good viscous glutinous effect, not easily to fall off, effectively promote the service life of the components such as metal.
Description
Technical field
The present invention relates to sealant processing technique fields, and in particular to a kind of low air penetrability butyl sealant.
Background technique
Butyl sealant is the sealant of the material based on isobutylene-based polymer, is maximum 4 kinds of world's consumption close
One of sealing.With excellent Weather-resistant, heat-resisting, acid-proof alkaline and excellent air-tightness and electrical insulation capability.It can divide
For vulcanization type, non-vulcanization type and heat molten type.Wherein non-vulcanization type can be divided into solvent volatile-type, preforming adhesive tape and butyl sealing again
Cream (putty).Solvent volatile-type is to be kneaded, shredded, dissolved and is made；Preforming adhesive tape is then to be kneaded, squeeze out and be made；
Sealing compound can be manufactured with the method that dissolution method or three-roller are ground.Butyl sealant is widely used in various machinery, pipeline, glass peace
The sealings such as dress, cable connector and building, hydraulic engineering etc..
When butyl sealant handles mechanical, pipeline and construction material, the quality of leakproofness influences component
Service life and using effect, particularly with the sealing of metal welding position, traditional sealant has certain air penetrability, long
Long use can make metal welding position rust corrosion, cause damage of product, influence economic benefit.
Summary of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of low air penetrability butyl sealant, traditional butyl sealing is improved
The airtightness of glue reduces the rate that is passed through of air, and the present invention has good viscous glutinous effect, not easily to fall off, effectively promotes gold
The service life of the components such as category.
In order to achieve the above object, technical solution of the present invention is achieved by the following technical programs:
A kind of low air penetrability butyl sealant, the low air penetrability butyl sealant are made of raw material from the following weight: butyl
25-35 parts of rubber, 30-40 parts of natural rubber, 10-20 parts of rosin resin, 6-10 parts of ancient marlon resin, 4-6 parts of zinc oxide, oxidation
3-5 parts of magnesium, 90-110 parts of dimethylbenzene, 25-35 parts of polymethyl methacrylate resin, 50-60 parts of Paris white.
Preferably, the low air penetrability butyl sealant is made of raw material from the following weight: 30 parts of butyl rubber, natural
35 parts of rubber, 15 parts of rosin resin, 8 parts of ancient marlon resin, 5 parts of zinc oxide, 4 parts of magnesia, 100 parts of dimethylbenzene, metering system
30 parts of sour late resin, 55 parts of Paris white.
The preparation method of the low air penetrability butyl sealant the following steps are included:
(1) it is added in autoclave after mixing rosin resin and ancient marlon resin, stirs 20- under high pressure in high temperature
30min adds after magnesia adjusts temperature and continues stirring a period of time, it is spare to obtain hybrid resin；
(2) polymethyl methacrylate resin and dimethylbenzene are mixed in blender high temperature and stir at low speed a period of time, added
Hybrid resin in step (1), adjustment revolving speed continue stirring a period of time, it is spare to obtain mixed material；
(3) it is mixed after crushing butyl rubber and natural rubber, high temperature is carried out in kneader and mediates a period of time, then adjusts temperature
Degree, is added zinc oxide and Paris white continues to mediate a period of time, and it is spare to obtain mixed rubber；
(4) after mixing above-mentioned mixed rubber with mixed material, stirred in blender high temperature, after it is cooling under room temperature, obtain low
Air penetrability butyl sealant.
Preferably, rosin resin and the temperature of ancient marlon resin mixing high temperature and pressure stirring are 140-150 in step (1)
DEG C, pressure 20-22MPa, the temperature after magnesia is added is 120-130 DEG C, mixing time 40-50min.
Preferably, the temperature that polymethyl methacrylate resin and dimethylbenzene are mixed in step (2) is 80-90 DEG C, is stirred
The revolving speed mixed is 120-200r/min, and it is 400-600r/min that the revolving speed stirred after hybrid resin, which is added,.
Preferably, the temperature that butyl rubber and natural rubber high temperature are mediated in step (3) is 100-110 DEG C, kneading when
Between be 20-30min, it is 140-150 DEG C that zinc oxide and Paris white, which is added, to continue the warm degree mediated, kneading time 50-
60min。
Preferably, the temperature of blender high-temperature stirring is 120-140 DEG C in step (4), and the revolving speed of stirring is 1000-
1200r/min, mixing time 30-40min.
The present invention provides a kind of low air penetrability butyl sealant, and advantage is compared with prior art:
(1) present invention is mixed using butyl rubber and natural rubber, effectively can play good sealing function to metal soldered
And bond effect is good, not easily to fall off in the long-term use.
(2) present invention is added with rosin resin, ancient marlon resin and polymethyl methacrylate resin, can have after high temperature mixing
Effect reduces the transmitance of gas, and reduction is contacted with air by sealer, reduces its aging speed, prolong the service life.
(3) present invention makes its mixing by the way of to resin and rubber segmentally heating, can effectively promote the stabilization of product
Property, the quality of comprehensive lift-off seal glue.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below with reference to the embodiment of the present invention pair
Technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is a part of the invention
Embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making wound
Every other embodiment obtained under the premise of the property made labour, shall fall within the protection scope of the present invention.
Embodiment 1:
A kind of low air penetrability butyl sealant, the low air penetrability butyl sealant are made of raw material from the following weight: butyl
25 parts of rubber, 30 parts of natural rubber, 10 parts of rosin resin, 6 parts of ancient marlon resin, 4 parts of zinc oxide, 3 parts of magnesia, dimethylbenzene 90
Part, 25 parts of polymethyl methacrylate resin, 50 parts of Paris white.
The preparation method of the low air penetrability butyl sealant the following steps are included:
(1) it is added in autoclave after mixing rosin resin and ancient marlon resin, stirs 20- under high pressure in high temperature
30min adds after magnesia adjusts temperature and continues stirring a period of time, it is spare to obtain hybrid resin；
(2) polymethyl methacrylate resin and dimethylbenzene are mixed in blender high temperature and stir at low speed a period of time, added
Hybrid resin in step (1), adjustment revolving speed continue stirring a period of time, it is spare to obtain mixed material；
(3) it is mixed after crushing butyl rubber and natural rubber, high temperature is carried out in kneader and mediates a period of time, then adjusts temperature
Degree, is added zinc oxide and Paris white continues to mediate a period of time, and it is spare to obtain mixed rubber；
(4) after mixing above-mentioned mixed rubber with mixed material, stirred in blender high temperature, after it is cooling under room temperature, obtain low
Air penetrability butyl sealant.
Wherein, rosin resin and the temperature of ancient marlon resin mixing high temperature and pressure stirring are 140-150 DEG C in step (1),
Pressure is 20-22MPa, and the temperature after magnesia is added is 120-130 DEG C, mixing time 40-50min；Methyl in step (2)
The temperature that methacrylate resin and dimethylbenzene are mixed is 80-90 DEG C, and the revolving speed of stirring is 120-200r/min, is added mixed
The revolving speed stirred after resin is 400-600r/min；Butyl rubber and the temperature of natural rubber high temperature kneading are in step (3)
100-110 DEG C, the time of kneading is 20-30min, and zinc oxide is added and Paris white continues the warm degree mediated as 140-150
DEG C, kneading time 50-60min；The temperature of blender high-temperature stirring is 120-140 DEG C in step (4), and the revolving speed of stirring is
1000-1200r/min, mixing time 30-40min.
Embodiment 2:
A kind of low air penetrability butyl sealant, the low air penetrability butyl sealant are made of raw material from the following weight: butyl
35 parts of rubber, 40 parts of natural rubber, 20 parts of rosin resin, 10 parts of ancient marlon resin, 6 parts of zinc oxide, 5 parts of magnesia, dimethylbenzene
110 parts, 35 parts of polymethyl methacrylate resin, 60 parts of Paris white.
The preparation method of the low air penetrability butyl sealant the following steps are included:
(1) it is added in autoclave after mixing rosin resin and ancient marlon resin, stirs 20- under high pressure in high temperature
30min adds after magnesia adjusts temperature and continues stirring a period of time, it is spare to obtain hybrid resin；
(2) polymethyl methacrylate resin and dimethylbenzene are mixed in blender high temperature and stir at low speed a period of time, added
Hybrid resin in step (1), adjustment revolving speed continue stirring a period of time, it is spare to obtain mixed material；
(3) it is mixed after crushing butyl rubber and natural rubber, high temperature is carried out in kneader and mediates a period of time, then adjusts temperature
Degree, is added zinc oxide and Paris white continues to mediate a period of time, and it is spare to obtain mixed rubber；
(4) after mixing above-mentioned mixed rubber with mixed material, stirred in blender high temperature, after it is cooling under room temperature, obtain low
Air penetrability butyl sealant.
Wherein, rosin resin and the temperature of ancient marlon resin mixing high temperature and pressure stirring are 140-150 DEG C in step (1),
Pressure is 20-22MPa, and the temperature after magnesia is added is 120-130 DEG C, mixing time 40-50min；Methyl in step (2)
The temperature that methacrylate resin and dimethylbenzene are mixed is 80-90 DEG C, and the revolving speed of stirring is 120-200r/min, is added mixed
The revolving speed stirred after resin is 400-600r/min；Butyl rubber and the temperature of natural rubber high temperature kneading are in step (3)
100-110 DEG C, the time of kneading is 20-30min, and zinc oxide is added and Paris white continues the warm degree mediated as 140-150
DEG C, kneading time 50-60min；The temperature of blender high-temperature stirring is 120-140 DEG C in step (4), and the revolving speed of stirring is
1000-1200r/min, mixing time 30-40min.
Embodiment 3:
A kind of low air penetrability butyl sealant, the low air penetrability butyl sealant are made of raw material from the following weight: butyl
30 parts of rubber, 35 parts of natural rubber, 15 parts of rosin resin, 8 parts of ancient marlon resin, 5 parts of zinc oxide, 4 parts of magnesia, dimethylbenzene
100 parts, 30 parts of polymethyl methacrylate resin, 55 parts of Paris white.
The preparation method of the low air penetrability butyl sealant the following steps are included:
(1) it is added in autoclave after mixing rosin resin and ancient marlon resin, stirs 20- under high pressure in high temperature
30min adds after magnesia adjusts temperature and continues stirring a period of time, it is spare to obtain hybrid resin；
(2) polymethyl methacrylate resin and dimethylbenzene are mixed in blender high temperature and stir at low speed a period of time, added
Hybrid resin in step (1), adjustment revolving speed continue stirring a period of time, it is spare to obtain mixed material；
(3) it is mixed after crushing butyl rubber and natural rubber, high temperature is carried out in kneader and mediates a period of time, then adjusts temperature
Degree, is added zinc oxide and Paris white continues to mediate a period of time, and it is spare to obtain mixed rubber；
(4) after mixing above-mentioned mixed rubber with mixed material, stirred in blender high temperature, after it is cooling under room temperature, obtain low
Air penetrability butyl sealant.
Wherein, rosin resin and the temperature of ancient marlon resin mixing high temperature and pressure stirring are 140-150 DEG C in step (1),
Pressure is 20-22MPa, and the temperature after magnesia is added is 120-130 DEG C, mixing time 40-50min；Methyl in step (2)
The temperature that methacrylate resin and dimethylbenzene are mixed is 80-90 DEG C, and the revolving speed of stirring is 120-200r/min, is added mixed
The revolving speed stirred after resin is 400-600r/min；Butyl rubber and the temperature of natural rubber high temperature kneading are in step (3)
100-110 DEG C, the time of kneading is 20-30min, and zinc oxide is added and Paris white continues the warm degree mediated as 140-150
DEG C, kneading time 50-60min；The temperature of blender high-temperature stirring is 120-140 DEG C in step (4), and the revolving speed of stirring is
1000-1200r/min, mixing time 30-40min.
Embodiment 4:
Choosing butyl sealant obtained by above-described embodiment 1-3 is experimental group material, and the common butyl sealant in market is control group material
Each group sealant coating thickness is respectively 1.8mm, detects its air penetrability for 24 hours using hot steam by material, as a result as shown in the table:
| Group | Moisture-vapor transmission (%) |
| Embodiment 1 | 0.012 |
| Embodiment 2 | 0.009 |
| Embodiment 3 | 0.006 |
| Control group | 0.037 |
Obtained by upper table, present invention gained butyl sealant has good leakproofness, and 3 products obtained therefrom leakproofness of embodiment
It is optimal.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (7)
1. a kind of low air penetrability butyl sealant, which is characterized in that the low air penetrability butyl sealant is by following parts by weight
Raw material is made: 25-35 parts of butyl rubber, 30-40 parts of natural rubber, 10-20 parts of rosin resin, 6-10 parts of ancient marlon resin, oxygen
Change zinc 4-6 parts, 3-5 parts of magnesia, 90-110 parts of dimethylbenzene, 25-35 parts of polymethyl methacrylate resin, Paris white 50-60
Part.
2. a kind of low air penetrability butyl sealant according to claim 1, which is characterized in that the low air penetrability butyl is close
Sealing is made of raw material from the following weight: 30 parts of butyl rubber, 35 parts of natural rubber, 15 parts of rosin resin, ancient marlon resin 8
Part, 5 parts of zinc oxide, 4 parts of magnesia, 100 parts of dimethylbenzene, 30 parts of polymethyl methacrylate resin, 55 parts of Paris white.
3. a kind of low air penetrability butyl sealant according to claim 1 to 2, which is characterized in that the low air penetrability butyl
The preparation method of sealant the following steps are included:
(1) it is added in autoclave after mixing rosin resin and ancient marlon resin, stirs 20- under high pressure in high temperature
30min adds after magnesia adjusts temperature and continues stirring a period of time, it is spare to obtain hybrid resin；
(2) polymethyl methacrylate resin and dimethylbenzene are mixed in blender high temperature and stir at low speed a period of time, added
Hybrid resin in step (1), adjustment revolving speed continue stirring a period of time, it is spare to obtain mixed material；
(3) it is mixed after crushing butyl rubber and natural rubber, high temperature is carried out in kneader and mediates a period of time, then adjusts temperature
Degree, is added zinc oxide and Paris white continues to mediate a period of time, and it is spare to obtain mixed rubber；
(4) after mixing above-mentioned mixed rubber with mixed material, stirred in blender high temperature, after it is cooling under room temperature, obtain low
Air penetrability butyl sealant.
4. a kind of low air penetrability butyl sealant according to claim 3, it is characterised in that: rosin resin in step (1)
Temperature with ancient marlon resin mixing high temperature and pressure stirring is 140-150 DEG C, pressure 20-22MPa, the temperature after magnesia is added
Degree is 120-130 DEG C, mixing time 40-50min.
5. a kind of low air penetrability butyl sealant according to claim 3, it is characterised in that: metering system in step (2)
The temperature that sour late resin and dimethylbenzene are mixed is 80-90 DEG C, and the revolving speed of stirring is 120-200r/min, and compound tree is added
The revolving speed stirred after rouge is 400-600r/min.
6. a kind of low air penetrability butyl sealant according to claim 3, it is characterised in that: butyl rubber in step (3)
It is 100-110 DEG C with the temperature that natural rubber high temperature is mediated, the time of kneading is 20-30min, and zinc oxide and Paris white is added
Continuing the warm degree mediated is 140-150 DEG C, kneading time 50-60min.
7. a kind of low air penetrability butyl sealant according to claim 3, it is characterised in that: blender is high in step (4)
The temperature of temperature stirring is 120-140 DEG C, and the revolving speed of stirring is 1000-1200r/min, mixing time 30-40min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811042805.7A CN109280510A (en) | 2018-09-07 | 2018-09-07 | A kind of low air penetrability butyl sealant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811042805.7A CN109280510A (en) | 2018-09-07 | 2018-09-07 | A kind of low air penetrability butyl sealant |
Publications (1)
| Publication Number | Publication Date |
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| CN109280510A true CN109280510A (en) | 2019-01-29 |
Family
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Family Applications (1)
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|---|---|---|---|
| CN201811042805.7A Pending CN109280510A (en) | 2018-09-07 | 2018-09-07 | A kind of low air penetrability butyl sealant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022013336A1 (en) * | 2020-07-16 | 2022-01-20 | Omya International Ag | Use of a porous filler for reducing the gas permeability of an elastomer composition |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106634706A (en) * | 2015-10-28 | 2017-05-10 | 芜湖县双宝建材有限公司 | Environment-friendly sealant and preparation method thereof |
| US20170355885A1 (en) * | 2014-11-14 | 2017-12-14 | 3M Innovative Properties Company | Post-curable rubber-based pressure-sensitive adhesive |
-
2018
- 2018-09-07 CN CN201811042805.7A patent/CN109280510A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170355885A1 (en) * | 2014-11-14 | 2017-12-14 | 3M Innovative Properties Company | Post-curable rubber-based pressure-sensitive adhesive |
| CN106634706A (en) * | 2015-10-28 | 2017-05-10 | 芜湖县双宝建材有限公司 | Environment-friendly sealant and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022013336A1 (en) * | 2020-07-16 | 2022-01-20 | Omya International Ag | Use of a porous filler for reducing the gas permeability of an elastomer composition |
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