CA3093148A1 - Granular butyl rubber composition with anti-sticking effect, method for preparing same and its use - Google Patents
Granular butyl rubber composition with anti-sticking effect, method for preparing same and its use Download PDFInfo
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Abstract
The disclosure belongs to the field of rubber preparation, and specifically relates to a granular butyl rubber composition with anti-sticking effect and a preparation rnethod and application thereof. The cornposition is obtained by uniformly mixing the granular butyl rubber with a srnall amount of solid additives being one or rnore selected frorn a group consisting of talc, calcium stearate, rnagnesiurn stearate, calcium carbonate, carbon black or clay, and a) the specific surface area BET
of each cornponent of the solid additive (.m7g) is 0.1<BET<3.0; b) the added amount of the solid additives are 0.5-50 parts by rnass relative to 100 parts by mass of the butyl rubber component; c) the solid additives are added through a powder sprayer.
Compared with the single-component butyl rubber, the composition provided by the present disclosure does not cause sticking. The cornposition is still granular rubber after being stacked for 270 days, and after being pressurized to lOkpa for one month.
Various advantages of butyl rubber are realized.
of each cornponent of the solid additive (.m7g) is 0.1<BET<3.0; b) the added amount of the solid additives are 0.5-50 parts by rnass relative to 100 parts by mass of the butyl rubber component; c) the solid additives are added through a powder sprayer.
Compared with the single-component butyl rubber, the composition provided by the present disclosure does not cause sticking. The cornposition is still granular rubber after being stacked for 270 days, and after being pressurized to lOkpa for one month.
Various advantages of butyl rubber are realized.
Description
GRANULAR BUTYL RUBBER COMPOSITION WITH ANTI-STICKING
EFFECT, METHOD FOR PREPARING SAME AND ITS USE
TECHNICAL FIELD
The present disclosure belongs to the field of rubber preparation, and in particular, to a granular butyl rubber composition with anti-sticking effect and a method for preparing the same and its use.
BACKGROUND
Butyl rubber has excellent air tightness and good properties, such as heat resistance, aging resistance, acid and alkali resistance, ozone resistance, solvent resistance, electrical insulation, shock absorption and low water absorption, making it widely used in inner tubes, water tires, vulcanizing bladders, inner liners, sidewalk, wires and cables, waterproof building materials, shock absorption materials, pharmaceutical bottle stoppers, food (gum binder), rubber dams, anti-virus appliances, adhesives, inner tube valve cores, anti-corrosion products, wharf ship protections, bridge support cushions and heat-resistant conveyor belts, etc..
Technical Problem The traditional butyl rubber products are all block rubbers. The rubber blocks are first heat-sealed with high-pressure polyethylene (PE) film and then placed in wooden or iron boxes for storage and transportation. This kind of block shape is not convenient for storage and transportation, and it increases the cost of molding and packaging of the production line of butyl rubber manufacturers and prolongs the processing time.
Date recue/Date Received 2020-09-13 SUMMARY
In order to overcome the above-mentioned shortcomings caused by the difficulty of pelletizing the existing block rubber, the first object of the present disclosure is to provide a granular butyl rubber composition with anti-sticking effect.
Comparing with single-component butyl rubber, no sticking occurs. The composition is still granular rubber after being stacked for 270 days, and still granular rubber after being pressurized to 10kpa for one month.
In order to achieve the above-mentioned first objective, the present disclosure adopts the following technical solutions:
A granular butyl rubber composition with anti-sticking effect may be obtained by uniformly mixing the granular butyl rubber with a small amount of solid additives.
The solid additives may be one or more selected from a group consisting of talc, calcium stearate, magnesium stearate, calcium carbonate, carbon black and clay, and, a) the specific surface area BET (m7g) of each component of the solid additives may be within 0.1<BET <3.0;
b) the amount of solid additives added may be 0.5-50 parts by mass relative to 100 parts by mass of butyl rubber components;
c) the solid additives may be added through a powder sprayer.
In the above technical solution, by adding the above solid additives to the butyl rubber, the sticking among the butyl rubbers can be effectively prevented, the granular structure can be maintained, and it may be still granular rubber after being stacked for 270d, and may be still granular after being pressurized to 10kpa for a month.
The types of solid additives selected in this solution may be also used in rubber processing. They may be used in the downstream rubber processing industry (especially several components used in the tire manufacturing industry) to improve rubber processing and application performance, without involving rubber anti-sticking effect. For example, in the synthetic manufacturing process of butyl rubber, calcium stearate may be commonly used as a dispersant for rubber particles in the water phase.
When exploring the appropriate range of the specific surface area of the additives,
EFFECT, METHOD FOR PREPARING SAME AND ITS USE
TECHNICAL FIELD
The present disclosure belongs to the field of rubber preparation, and in particular, to a granular butyl rubber composition with anti-sticking effect and a method for preparing the same and its use.
BACKGROUND
Butyl rubber has excellent air tightness and good properties, such as heat resistance, aging resistance, acid and alkali resistance, ozone resistance, solvent resistance, electrical insulation, shock absorption and low water absorption, making it widely used in inner tubes, water tires, vulcanizing bladders, inner liners, sidewalk, wires and cables, waterproof building materials, shock absorption materials, pharmaceutical bottle stoppers, food (gum binder), rubber dams, anti-virus appliances, adhesives, inner tube valve cores, anti-corrosion products, wharf ship protections, bridge support cushions and heat-resistant conveyor belts, etc..
Technical Problem The traditional butyl rubber products are all block rubbers. The rubber blocks are first heat-sealed with high-pressure polyethylene (PE) film and then placed in wooden or iron boxes for storage and transportation. This kind of block shape is not convenient for storage and transportation, and it increases the cost of molding and packaging of the production line of butyl rubber manufacturers and prolongs the processing time.
Date recue/Date Received 2020-09-13 SUMMARY
In order to overcome the above-mentioned shortcomings caused by the difficulty of pelletizing the existing block rubber, the first object of the present disclosure is to provide a granular butyl rubber composition with anti-sticking effect.
Comparing with single-component butyl rubber, no sticking occurs. The composition is still granular rubber after being stacked for 270 days, and still granular rubber after being pressurized to 10kpa for one month.
In order to achieve the above-mentioned first objective, the present disclosure adopts the following technical solutions:
A granular butyl rubber composition with anti-sticking effect may be obtained by uniformly mixing the granular butyl rubber with a small amount of solid additives.
The solid additives may be one or more selected from a group consisting of talc, calcium stearate, magnesium stearate, calcium carbonate, carbon black and clay, and, a) the specific surface area BET (m7g) of each component of the solid additives may be within 0.1<BET <3.0;
b) the amount of solid additives added may be 0.5-50 parts by mass relative to 100 parts by mass of butyl rubber components;
c) the solid additives may be added through a powder sprayer.
In the above technical solution, by adding the above solid additives to the butyl rubber, the sticking among the butyl rubbers can be effectively prevented, the granular structure can be maintained, and it may be still granular rubber after being stacked for 270d, and may be still granular after being pressurized to 10kpa for a month.
The types of solid additives selected in this solution may be also used in rubber processing. They may be used in the downstream rubber processing industry (especially several components used in the tire manufacturing industry) to improve rubber processing and application performance, without involving rubber anti-sticking effect. For example, in the synthetic manufacturing process of butyl rubber, calcium stearate may be commonly used as a dispersant for rubber particles in the water phase.
When exploring the appropriate range of the specific surface area of the additives,
2 Date recue/Date Received 2020-09-13 it was found that when the specific surface area of the additives is less than 0.1 iff/g, sticking and compaction will occur after the composition is left for a week.
When the specific surface area of the additives is higher than 3.0 rif/g, the anti-sticking effect of the composition may be good, but under non-sealed conditions, there will be difficulties in adding additives and uneven dispersion.
When the mass part is less than 0.5, the anti-sticking effect of the composition is not ideal, and some test samples have sticking phenomenon. When the mass part is higher than 50, the anti-sticking effect of the composition is not improved significantly and the processing performance is reduced.
For the addition of pure powder additives, the powder sprayer can achieve continuous, stable and uniform addition effects.
Preferably, before mixing the solid additives with the rubber, the butyl rubber may be dried so that the water content of the butyl rubber is < 1.0 wt%.
Keeping butyl rubber in this water content range may be beneficial to disperse solid additives and have a better anti-sticking effect.
Preferably, the volatile content of the dried butyl rubber should not exceed 1.0g/100g rubber.
Preferably, when the solid additives are mixed with the butyl rubber, the temperature T of the butyl rubber may be between 30 C<T<75 C.
Preferably, the drying process may adopt a vibrating fluidized bed to conduct heat and mass transfer with hot air during the process of conveying the butyl rubber for drying.
Preferably, the butyl rubber may be crushed by mechanical shearing before drying, until the diameter R of the butyl rubber is in the range of 5rnm<R<30mm. The smaller the particle size, the better the anti-sticking effect. When R>30mm, the rubber cannot completely coat the additives, and some additives may sink with gravity, resulting in uneven distribution of the additives, resulting in local sticking of the composition after being placed for a period of time.
Preferably, the specific surface area BET (1112/0 of each component of the solid
When the specific surface area of the additives is higher than 3.0 rif/g, the anti-sticking effect of the composition may be good, but under non-sealed conditions, there will be difficulties in adding additives and uneven dispersion.
When the mass part is less than 0.5, the anti-sticking effect of the composition is not ideal, and some test samples have sticking phenomenon. When the mass part is higher than 50, the anti-sticking effect of the composition is not improved significantly and the processing performance is reduced.
For the addition of pure powder additives, the powder sprayer can achieve continuous, stable and uniform addition effects.
Preferably, before mixing the solid additives with the rubber, the butyl rubber may be dried so that the water content of the butyl rubber is < 1.0 wt%.
Keeping butyl rubber in this water content range may be beneficial to disperse solid additives and have a better anti-sticking effect.
Preferably, the volatile content of the dried butyl rubber should not exceed 1.0g/100g rubber.
Preferably, when the solid additives are mixed with the butyl rubber, the temperature T of the butyl rubber may be between 30 C<T<75 C.
Preferably, the drying process may adopt a vibrating fluidized bed to conduct heat and mass transfer with hot air during the process of conveying the butyl rubber for drying.
Preferably, the butyl rubber may be crushed by mechanical shearing before drying, until the diameter R of the butyl rubber is in the range of 5rnm<R<30mm. The smaller the particle size, the better the anti-sticking effect. When R>30mm, the rubber cannot completely coat the additives, and some additives may sink with gravity, resulting in uneven distribution of the additives, resulting in local sticking of the composition after being placed for a period of time.
Preferably, the specific surface area BET (1112/0 of each component of the solid
3 Date recue/Date Received 2020-09-13 additives may be within 1.0<BET<2Ø
Preferably, the single-component mixing amount of the solid additives may be 10-35 parts by mass relative to 100 parts by mass of the butyl rubber component.
Through the implementation of the above technical solutions, the composition provided by the present disclosure, when compared with single-component butyl rubber, does not cause sticking. The composition may be still granular rubber after being stacked for 270 days, and it may be still granular rubber after being pressurized to 10kpa for a month. Various advantages of granular butyl rubber can be realized.
The second objective of the present disclosure is to provide a method for preparing the above granular butyl rubber composition with anti-sticking effect, which includes the following steps:
S-1: after shredding the butyl rubber raw material, performing drying process to obtain the granular butyl rubber;
S-2: sending the granular butyl rubber to a distributor after dried, and adding the solid additives to the granular butyl rubber through the powder sprayer;
S-3: transporting a preliminary product of the granular butyl rubber composition separated by the distributor to a throat-type metal detector for metal foreign body detection, then obtaining a qualified granular butyl rubber composition product.
After Step S-3, there may be S-4: sending the initial granular butyl rubber composition that has passed the metal foreign body detection to the granule packaging machine to complete the weighing and packaging at the same time, and then performing the second weighing before packaging.
The above technical solution cancels the briquetting process of butyl rubber, no more splitting of rubber particles. Two feeders, one scale and one briquetting machine are canceled. Metal detection, weight verification, packaging and boxing of granular rubber are completed. The method is simplified, production resources are saved, and production costs are reduced.
The third object of the present disclosure is to provide the application of the above composition, which has excellent air tightness and good properties, such as heat
Preferably, the single-component mixing amount of the solid additives may be 10-35 parts by mass relative to 100 parts by mass of the butyl rubber component.
Through the implementation of the above technical solutions, the composition provided by the present disclosure, when compared with single-component butyl rubber, does not cause sticking. The composition may be still granular rubber after being stacked for 270 days, and it may be still granular rubber after being pressurized to 10kpa for a month. Various advantages of granular butyl rubber can be realized.
The second objective of the present disclosure is to provide a method for preparing the above granular butyl rubber composition with anti-sticking effect, which includes the following steps:
S-1: after shredding the butyl rubber raw material, performing drying process to obtain the granular butyl rubber;
S-2: sending the granular butyl rubber to a distributor after dried, and adding the solid additives to the granular butyl rubber through the powder sprayer;
S-3: transporting a preliminary product of the granular butyl rubber composition separated by the distributor to a throat-type metal detector for metal foreign body detection, then obtaining a qualified granular butyl rubber composition product.
After Step S-3, there may be S-4: sending the initial granular butyl rubber composition that has passed the metal foreign body detection to the granule packaging machine to complete the weighing and packaging at the same time, and then performing the second weighing before packaging.
The above technical solution cancels the briquetting process of butyl rubber, no more splitting of rubber particles. Two feeders, one scale and one briquetting machine are canceled. Metal detection, weight verification, packaging and boxing of granular rubber are completed. The method is simplified, production resources are saved, and production costs are reduced.
The third object of the present disclosure is to provide the application of the above composition, which has excellent air tightness and good properties, such as heat
4 Date recue/Date Received 2020-09-13 resistance, aging resistance, acid and alkali resistance, ozone resistance, solvent resistance, electrical insulation, shock absorption and low water absorption, making it widely used in inner tubes, water tires, vulcanizing bladders, inner liners, sidewalls, wires and cables, waterproof building materials, shock absorption materials, pharmaceutical bottle stoppers, food (gum binder), rubber dams, and anti-virus appliances, adhesives, inner tube valve cores, anti-corrosion products, wharf ship protections, bridge support cushions, and heat-resistant conveyor belts, etc..
Beneficial Effect Compared with the single-component butyl rubber, the composition provided by the present disclosure does not cause sticking. The composition may be still granular rubber after being stacked for 270 days, and may be still granular after being pressurized to 10kpa for one month. Various advantages of butyl rubber can be realized.
The preparation method of the present disclosure cancels the briquetting process of butyl rubber, no more splitting of rubber particles. Two feeders, the primary scale and the briquetting machine are canceled. Metal detection, weight verification, packaging and boxing of granular rubber are completed. The method is simplified, production resources are saved, and production costs are reduced.
DESCRIPTION OF THE DRAWINGS
Fig. I is a schematic diagram of a butyl rubber packaging line in the prior art;
Fig. 2 is a schematic diagram of the packaging of the granular butyl rubber composition provided by the present disclosure.
BEST MODE OF PRESENT DISCLOSURE
A granular butyl rubber composition with anti-sticking effect may be obtained by uniformly mixing the granular butyl rubber with a small amount of solid additives, the solid additive may be talc, and, the specific surface area BET (rn2/g) of each component of the solid additives Date recue/Date Received 2020-09-13 may be within 0.1<BET <3.0;
the single-component mixing amount of the solid additives may be 0.5 parts by mass relative to 100 parts by mass of the butyl rubber component.
The above granular butyl rubber composition may be prepared as follows:
S-1: after shredding the butyl rubber material until the butyl rubber diameter R is in the range of 5mm-25mm, drying it until the water content of the butyl rubber is <1.0wt%, and the volatile content of the butyl rubber should not exceed 1.0g/100g rubber to obtain granular butyl rubber;
S-2: sending the dried granular butyl rubber to the distributor, and adding the solid additives to the granular butyl rubber through the powder sprayer;
S-3: transporting a preliminary product of the granular butyl rubber composition separated by the distributor to a throat-type metal detector for metal foreign body detection, then obtaining a qualified granular butyl rubber composition product;
S-4: sending the initial granular butyl rubber composition that has passed the metal foreign body detection to the granule packaging machine to complete the weighing and packaging at the same time, and then performing the second weighing before packaging.
DETAILED DESCRIPTION OF THE EMBODIMENTS
The content of the present disclosure will be further described in detail below combining with specific embodiments. It should be understood that the embodiments of the present disclosure are only used to illustrate the present disclosure and not to limit the present disclosure. Without departing from the technical idea of the present disclosure, various substitutions and changes made based on common technical knowledge and conventional means in the field should be included in the scope of the present disclosure.
Embodiment 1 A granular butyl rubber composition with anti-sticking effect may be obtained by Date recue/Date Received 2020-09-13 uniformly mixing the granular butyl rubber with a small amount of solid additives, the solid additives may be calcium stearate, and, the specific surface area BET (ma/g) of each component of the solid additives may be within 0.1<BET <3.0;
the single-component mixing amount of the solid additives may be 30 parts by mass relative to 100 parts by mass of the butyl rubber component.
The above granular butyl rubber composition may be prepared as follows:
S-1: after shredding the butyl rubber material until the butyl rubber diameter R is in the range of 25mm-30mm, drying it until the water content of the butyl rubber is --1.0w0/0, and the volatile content of the butyl rubber should not exceed 1.0g/100g rubber to obtain granular butyl rubber;
S-2: sending the dried granular butyl rubber to the distributor, and adding the solid additives to the granular butyl rubber through the powder sprayer;
S-3: transporting a preliminary product of the granular butyl rubber composition separated by the distributor to a throat-type metal detector for metal foreign body detection, then obtaining a qualified granular butyl rubber composition product;
S-4: sending the initial granular butyl rubber composition that has passed the metal foreign body detection to the granule packaging machine to complete the weighing and packaging at the same time, and then performing the second weighing before packaging Embodiment 2 A granular butyl rubber composition with anti-sticking effect may be obtained by uniformly mixing the granular butyl rubber with a small amount of solid additives, the solid additives may be calcium carbonate, and, the specific surface area BET (1112/g) of each component of the solid additives may be within 0.1<BET <3.0;
the single-component mixing amount of the solid additive may be 50 parts by mass relative to 100 parts by mass of the butyl rubber component.
Date recue/Date Received 2020-09-13 The above granular butyl rubber composition may be prepared as follows:
S-1: after shredding the butyl rubber material until the butyl rubber diameter R is in the range of 5mm40mm, drying it until the water content of the butyl rubber is 1.0wt%, and the volatile content of the butyl rubber should not exceed 1.0g/100g rubber to obtain granular butyl rubber;
S-2: sending the dried granular butyl rubber to the distributor, and adding the solid additives to the granular butyl rubber through the powder sprayer;
S-3: transporting a preliminary product of the granular butyl rubber composition separated by the distributor to a throat-type metal detector for metal foreign body detection, then obtaining a qualified granular butyl rubber composition product;
S-4: sending the initial granular butyl rubber composition that has passed the metal foreign body detection to the granule packaging machine to complete the weighing and packaging at the same time, and then performing the second weighing before packaging.
Embodiment 3 The difference from Embodiment 1 is that the solid additives may be a mixture of tale and clay in a weight ratio of 2:1.
Embodiment 4 The difference from Embodiment 1 is that the solid additive may be clay.
The composition obtained in the above embodiments has excellent air tightness and other good properties, such as heat resistance, aging resistance, acid and alkali resistance, ozone resistance, solvent resistance, electrical insulation, shock absorption and low water absorption, making it widely used in inner tubes, water tires, vulcanizing bladders, inner liners, sidewalls, wires and cables, waterproof building materials, shock absorption materials, medicinal bottle stoppers, food (gum binder), rubber dams, anti-virus appliances, adhesives, inner tube valve cores, anti-corrosion Date recue/Date Received 2020-09-13 products, wharf ship protections, bridge support cushions, and heat-resistant conveyor belts, etc..
Comparative Example I
The single-component butyl rubber adopts the following existing technology of butyl rubber in the product packaging part of the process:
The process of butyl rubber in product packaging: the granular rubber with a diameter of 5-30mm (water content <1.0wt%) may be transported from the drying unit (vibrating fluidized bed) to the distributor, and the distributor may continuously feed through the vibration of the vibrating feeder. The vibrating feeder may periodically feed to the primary scale. When the product weight in the primary scale reaches the set value (25/18kg), the feeder may stop feeding, and the primary scale may discharge the material to the briquetting machine chamber. After discharging is completed, the feeder may continue to feed to the primary scale, and so on.
The briquetting machine may need to spray an atomized release agent (silicone oil/white oil) into the chamber for 2-8s (0.05-0.1wt%o) before receiving rubber particles, and the granular rubber falling into the briquetting machine chamber may change from granular rubber to lump rubber (700*350*150mm) for 5 ¨30s and under the action of 30-150bar pressure in the longitudinal cylinder of the briquetting machine.
The rubber block may be pushed to the conveyor belt by the lateral cylinder of the briquetting machine, and may then pass through the arch-type metal detector in turn (detection accuracy: iron y2.5mm, non-iron (p3.0mm, stainless steel (p3.5mm) to detect metal foreign objects, then may be checked the weight with a secondary scale, and finally may be heat-sealed for the product through a film packaging machine (upper film: 760mm, lower film: 600mm, material: PE). After packaging, the products may be packed into the warehouse, and the products containing metal foreign objects may be rejected by the No. 1 sorter as by-products, and the products whose weight exceeds the control range may be rejected by the No. 2 sorter for weight calibration and returned to the production line as normal products.
Date recue/Date Received 2020-09-13 Compared with the Comparative Example 1, on the one hand, in terms of the process, after the briquetting process is cancelled, the rubber particles are no longer split, and the two feeders, the primary scale and the briquetting machine are eliminated, which can simplify the process and save production resources, such that the production costs can be reduced.
On the other hand, the composition products obtained in Embodiments 1-5 may be still granular rubber after being stacked for 270 days, and still granular rubber after being pressurized to 10 kpa for one month. However, the product obtained in Comparative Example I will stick after being stacked for 72 hours under normal temperature and pressure.
Date recue/Date Received 2020-09-13
Beneficial Effect Compared with the single-component butyl rubber, the composition provided by the present disclosure does not cause sticking. The composition may be still granular rubber after being stacked for 270 days, and may be still granular after being pressurized to 10kpa for one month. Various advantages of butyl rubber can be realized.
The preparation method of the present disclosure cancels the briquetting process of butyl rubber, no more splitting of rubber particles. Two feeders, the primary scale and the briquetting machine are canceled. Metal detection, weight verification, packaging and boxing of granular rubber are completed. The method is simplified, production resources are saved, and production costs are reduced.
DESCRIPTION OF THE DRAWINGS
Fig. I is a schematic diagram of a butyl rubber packaging line in the prior art;
Fig. 2 is a schematic diagram of the packaging of the granular butyl rubber composition provided by the present disclosure.
BEST MODE OF PRESENT DISCLOSURE
A granular butyl rubber composition with anti-sticking effect may be obtained by uniformly mixing the granular butyl rubber with a small amount of solid additives, the solid additive may be talc, and, the specific surface area BET (rn2/g) of each component of the solid additives Date recue/Date Received 2020-09-13 may be within 0.1<BET <3.0;
the single-component mixing amount of the solid additives may be 0.5 parts by mass relative to 100 parts by mass of the butyl rubber component.
The above granular butyl rubber composition may be prepared as follows:
S-1: after shredding the butyl rubber material until the butyl rubber diameter R is in the range of 5mm-25mm, drying it until the water content of the butyl rubber is <1.0wt%, and the volatile content of the butyl rubber should not exceed 1.0g/100g rubber to obtain granular butyl rubber;
S-2: sending the dried granular butyl rubber to the distributor, and adding the solid additives to the granular butyl rubber through the powder sprayer;
S-3: transporting a preliminary product of the granular butyl rubber composition separated by the distributor to a throat-type metal detector for metal foreign body detection, then obtaining a qualified granular butyl rubber composition product;
S-4: sending the initial granular butyl rubber composition that has passed the metal foreign body detection to the granule packaging machine to complete the weighing and packaging at the same time, and then performing the second weighing before packaging.
DETAILED DESCRIPTION OF THE EMBODIMENTS
The content of the present disclosure will be further described in detail below combining with specific embodiments. It should be understood that the embodiments of the present disclosure are only used to illustrate the present disclosure and not to limit the present disclosure. Without departing from the technical idea of the present disclosure, various substitutions and changes made based on common technical knowledge and conventional means in the field should be included in the scope of the present disclosure.
Embodiment 1 A granular butyl rubber composition with anti-sticking effect may be obtained by Date recue/Date Received 2020-09-13 uniformly mixing the granular butyl rubber with a small amount of solid additives, the solid additives may be calcium stearate, and, the specific surface area BET (ma/g) of each component of the solid additives may be within 0.1<BET <3.0;
the single-component mixing amount of the solid additives may be 30 parts by mass relative to 100 parts by mass of the butyl rubber component.
The above granular butyl rubber composition may be prepared as follows:
S-1: after shredding the butyl rubber material until the butyl rubber diameter R is in the range of 25mm-30mm, drying it until the water content of the butyl rubber is --1.0w0/0, and the volatile content of the butyl rubber should not exceed 1.0g/100g rubber to obtain granular butyl rubber;
S-2: sending the dried granular butyl rubber to the distributor, and adding the solid additives to the granular butyl rubber through the powder sprayer;
S-3: transporting a preliminary product of the granular butyl rubber composition separated by the distributor to a throat-type metal detector for metal foreign body detection, then obtaining a qualified granular butyl rubber composition product;
S-4: sending the initial granular butyl rubber composition that has passed the metal foreign body detection to the granule packaging machine to complete the weighing and packaging at the same time, and then performing the second weighing before packaging Embodiment 2 A granular butyl rubber composition with anti-sticking effect may be obtained by uniformly mixing the granular butyl rubber with a small amount of solid additives, the solid additives may be calcium carbonate, and, the specific surface area BET (1112/g) of each component of the solid additives may be within 0.1<BET <3.0;
the single-component mixing amount of the solid additive may be 50 parts by mass relative to 100 parts by mass of the butyl rubber component.
Date recue/Date Received 2020-09-13 The above granular butyl rubber composition may be prepared as follows:
S-1: after shredding the butyl rubber material until the butyl rubber diameter R is in the range of 5mm40mm, drying it until the water content of the butyl rubber is 1.0wt%, and the volatile content of the butyl rubber should not exceed 1.0g/100g rubber to obtain granular butyl rubber;
S-2: sending the dried granular butyl rubber to the distributor, and adding the solid additives to the granular butyl rubber through the powder sprayer;
S-3: transporting a preliminary product of the granular butyl rubber composition separated by the distributor to a throat-type metal detector for metal foreign body detection, then obtaining a qualified granular butyl rubber composition product;
S-4: sending the initial granular butyl rubber composition that has passed the metal foreign body detection to the granule packaging machine to complete the weighing and packaging at the same time, and then performing the second weighing before packaging.
Embodiment 3 The difference from Embodiment 1 is that the solid additives may be a mixture of tale and clay in a weight ratio of 2:1.
Embodiment 4 The difference from Embodiment 1 is that the solid additive may be clay.
The composition obtained in the above embodiments has excellent air tightness and other good properties, such as heat resistance, aging resistance, acid and alkali resistance, ozone resistance, solvent resistance, electrical insulation, shock absorption and low water absorption, making it widely used in inner tubes, water tires, vulcanizing bladders, inner liners, sidewalls, wires and cables, waterproof building materials, shock absorption materials, medicinal bottle stoppers, food (gum binder), rubber dams, anti-virus appliances, adhesives, inner tube valve cores, anti-corrosion Date recue/Date Received 2020-09-13 products, wharf ship protections, bridge support cushions, and heat-resistant conveyor belts, etc..
Comparative Example I
The single-component butyl rubber adopts the following existing technology of butyl rubber in the product packaging part of the process:
The process of butyl rubber in product packaging: the granular rubber with a diameter of 5-30mm (water content <1.0wt%) may be transported from the drying unit (vibrating fluidized bed) to the distributor, and the distributor may continuously feed through the vibration of the vibrating feeder. The vibrating feeder may periodically feed to the primary scale. When the product weight in the primary scale reaches the set value (25/18kg), the feeder may stop feeding, and the primary scale may discharge the material to the briquetting machine chamber. After discharging is completed, the feeder may continue to feed to the primary scale, and so on.
The briquetting machine may need to spray an atomized release agent (silicone oil/white oil) into the chamber for 2-8s (0.05-0.1wt%o) before receiving rubber particles, and the granular rubber falling into the briquetting machine chamber may change from granular rubber to lump rubber (700*350*150mm) for 5 ¨30s and under the action of 30-150bar pressure in the longitudinal cylinder of the briquetting machine.
The rubber block may be pushed to the conveyor belt by the lateral cylinder of the briquetting machine, and may then pass through the arch-type metal detector in turn (detection accuracy: iron y2.5mm, non-iron (p3.0mm, stainless steel (p3.5mm) to detect metal foreign objects, then may be checked the weight with a secondary scale, and finally may be heat-sealed for the product through a film packaging machine (upper film: 760mm, lower film: 600mm, material: PE). After packaging, the products may be packed into the warehouse, and the products containing metal foreign objects may be rejected by the No. 1 sorter as by-products, and the products whose weight exceeds the control range may be rejected by the No. 2 sorter for weight calibration and returned to the production line as normal products.
Date recue/Date Received 2020-09-13 Compared with the Comparative Example 1, on the one hand, in terms of the process, after the briquetting process is cancelled, the rubber particles are no longer split, and the two feeders, the primary scale and the briquetting machine are eliminated, which can simplify the process and save production resources, such that the production costs can be reduced.
On the other hand, the composition products obtained in Embodiments 1-5 may be still granular rubber after being stacked for 270 days, and still granular rubber after being pressurized to 10 kpa for one month. However, the product obtained in Comparative Example I will stick after being stacked for 72 hours under normal temperature and pressure.
Date recue/Date Received 2020-09-13
Claims (10)
What claimed is:
1. A granular butyl rubber composition with anti-sticking effect, wherein being obtained by uniformly mixing the granular butyl rubber and a small arnount of solid additives, the solid additives being one or more selected frorn a group comprising talc, calciurn stearate, magnesium stearate, calcium carbonate, carbon black and clay, and, a) a specific surface area BET (m2/g) of each component of the solid additives is 0.1<BET<3.0;
b) the arnount of solid additives added is 0.5-50 parts by mass relative to parts by mass of butyl rubber components;
c) the solid additives are added through a powder sprayer.
b) the arnount of solid additives added is 0.5-50 parts by mass relative to parts by mass of butyl rubber components;
c) the solid additives are added through a powder sprayer.
2. The granular butyl rubber composition according to claim 1, wherein a drying process is adopted for the butyl rubber before rnixing the solid additives with the rubber, such that a water content of the butyl rubber is wt%.
3. The granular butyl rubber composition according to clairn 2, wherein a volatile content of a dried butyl rubber exceeds less than 1.0 g per 100 g rubber.
4. The granular butyl rubber composition according to claim 1 or 2 or 3, wherein when mixing the solid additives with the butyl rubber, the butyl rubber temperature T
is 30 CT 75 C.
is 30 CT 75 C.
5. The granular butyl rubber composition according to clairn 2, wherein a vibrating fluidized bed is adopted in the drying process to conduct heat and mass transfer with hot air during a process of conveying the butyl rubber.
6. The granular butyl rubber composition according to claim 2, wherein the butyl Date recue/Date Received 2020-09-13 rubber is crushed by mechanical shearing before drying until a diameter R of the butyl rubber is 5rnrn<R<30mrn.
7. The granular butyl rubber composition according to clairn 1, wherein the specific surface area BET ( m2/g) of each component of the solid additives is 1.0<BET<2Ø
8. The granular butyl rubber composition according to claim 1, wherein a single-component rnixing amount of the solid additives is 10-35 parts by mass relative to 100 parts by mass of the butyl rubber component.
9. A method for preparing granular butyl rubber composition according to claim 1, wherein comprising the following steps:
S-1: after shredding the butyl rubber raw material, perfoi ______________ Ming drying process to obtain the granular butyl rubber;
S-2: sending thc granular butyl rubber to a distributor after dried, and adding the solid additives to the granular butyl rubber through the powder sprayer;
S-3: transporting a preliminary product of the granular butyl rubber cornposition separated by the distributor to a throat-type metal detector for metal foreign body detection, then obtaining a qualified granular butyl rubber composition product.
S-1: after shredding the butyl rubber raw material, perfoi ______________ Ming drying process to obtain the granular butyl rubber;
S-2: sending thc granular butyl rubber to a distributor after dried, and adding the solid additives to the granular butyl rubber through the powder sprayer;
S-3: transporting a preliminary product of the granular butyl rubber cornposition separated by the distributor to a throat-type metal detector for metal foreign body detection, then obtaining a qualified granular butyl rubber composition product.
10. A use of the granular butyl rubber composition according to claim 1 for inner tubes, water tires, curing bladders, inner liners, sidewalls, wires and cables, waterproof building rnaterials, shock absorption rnaterials, pharmaceutical bottle stoppers, food, rubber darns, anti-virus appliances, adhesives, inner tube valve cores, anti-corrosion products, wharf ship protections, bridge support cushions and heat-resistant conveyor belts.
Date recue/Date Received 2020-09-13
Date recue/Date Received 2020-09-13
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010360655.5 | 2020-04-30 | ||
| CN202010360655.5A CN111704772A (en) | 2020-04-30 | 2020-04-30 | Granular butyl rubber composition with anti-sticking effect and preparation method and application thereof |
| PCT/CN2020/102055 WO2021217892A1 (en) | 2020-04-30 | 2020-07-15 | Granular butyl rubber composition having anti-sticking effect, and preparation method therefor and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA3093148A1 true CA3093148A1 (en) | 2021-10-30 |
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ID=78336245
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3093148A Pending CA3093148A1 (en) | 2020-04-30 | 2020-07-15 | Granular butyl rubber composition with anti-sticking effect, method for preparing same and its use |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA3093148A1 (en) |
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2020
- 2020-07-15 CA CA3093148A patent/CA3093148A1/en active Pending
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