CN115447183A - Nitrogen vulcanization method for tire - Google Patents
Nitrogen vulcanization method for tire Download PDFInfo
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- CN115447183A CN115447183A CN202211141667.4A CN202211141667A CN115447183A CN 115447183 A CN115447183 A CN 115447183A CN 202211141667 A CN202211141667 A CN 202211141667A CN 115447183 A CN115447183 A CN 115447183A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
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Abstract
The invention relates to the technical field of tire vulcanization, and provides a nitrogen vulcanization method for a tire. The invention provides diversified vulcanization temperatures aiming at the vulcanization of the whole tire, and the internal temperature, the external temperature crown part temperature and the external temperature side wall temperature of the tire are respectively different, so that the vulcanization of different parts of a tire blank is realized at proper temperature, the temperature rise speed of the whole tire is close to that of the whole tire in the vulcanization process, and the vulcanization uniformity of the tire is realized; especially, the setting of the external temperature is obviously reduced compared with the external temperature in the traditional vulcanization method, thereby saving a great deal of energy. The tire manufactured by the nitrogen vulcanization method provided by the invention can greatly reduce the degree of over-vulcanization of the sidewall of the agricultural radial tire, improve the tire vulcanization uniformity, improve the performance of the tire body cord fabric of the sidewall of the agricultural radial tire and prolong the service life of the tire.
Description
Technical Field
The invention relates to the technical field of tire vulcanization, in particular to a nitrogen vulcanization method of a tire.
Background
The cord arrangement of the agricultural radial tire is different from that of a bias tire, the cords of the agricultural radial tire are not arranged in a cross way but are close to and parallel to the section of an outer tire, like the earth radial arrangement, the cord angle is small and is generally 0 degrees, and the carcass cords do not have maintenance intersection points.
However, the sidewall thickness of the agricultural radial tire is usually 10-20 mm, the crown thickness is 60-150 mm, the crown/side thickness difference is large, if the agricultural radial tire is vulcanized by adopting a traditional vulcanization mode, when the thickest crown part reaches positive vulcanization, the sidewall and the bead are seriously over-vulcanized, and the over-vulcanization degree reaches more than 8-10 times of the crown part, so that the vulcanization uniformity of the tire is difficult to ensure, the vulcanization degree of different parts is uneven, and the service performance of the tire is further influenced.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for nitrogen-vulcanizing a tire, which can significantly improve the uniformity of vulcanization of the entire tire and reduce the vulcanization time.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a nitrogen vulcanization method of a tire, which is characterized in that a tire blank is heated and vulcanized in a mold, the mold comprises a mold sleeve and upper and lower side plates, the mold sleeve corresponds to a tire crown of the tire blank, and the upper and lower side plates correspond to tire sidewalls of the tire blank, and the method comprises the following steps:
(1) Shaping the tire blank of the tire in the mold to obtain a shaped tire blank;
(2) Synchronously carrying out internal temperature vulcanization and external temperature vulcanization on the shaped tire blank;
the internal temperature vulcanization comprises internal temperature steam vulcanization and nitrogen pressure maintaining in sequence; the internal temperature steam vulcanization comprises internal temperature steam pressurization and internal temperature steam condensation discharging;
the external temperature vulcanization comprises the steps of synchronously heating the tire crown in a steam circulation manner in the die sleeve area and heating the tire side in a steam circulation manner in the upper side plate area and the lower side plate area;
the temperature of the steam circulation heating in the die sleeve area is 150-162 ℃, the temperature of the steam circulation heating in the upper and lower side plate areas is 120-140 ℃, and the temperature of the internal temperature steam adopted for internal temperature steam pressure and internal temperature steam condensation is 190-205 ℃.
Preferably, the pressure of the steam circulation in the die sleeve area in the step (2) is 0.4-0.5 MPa, and the circulation time is 60-95 min.
Preferably, the pressure of the steam circulation of the upper and lower side plate areas in the step (2) is 0.16 to 0.3MPa, and the circulation time is 60 to 95min.
Preferably, the pressure of the internal temperature steam for pressurizing and discharging and condensing the internal temperature steam is 1.4 to 1.9MPa.
Preferably, the pressure of the nitrogen pressure maintaining is 2.6-3.2 MPa, and the pressure maintaining time is 36-88 min and 40s.
Preferably, the number of times of the internal temperature steam pressurization is 3 to 5, the number of times of the internal temperature steam condensation discharging is 3 to 5, the first time of internal temperature steam pressurization and the first time of internal temperature steam condensation discharging are carried out synchronously, and then circulation is carried out according to the sequence of internal temperature steam pressurization first and internal temperature steam condensation discharging.
Preferably, nitrogen pressure maintaining is carried out after the internal temperature steam vulcanization is finished; the time for single internal temperature steam pressurization is 2-4 min, and the time for each non-first internal temperature steam condensation discharging is 10-60 s.
The invention provides a nitrogen vulcanization method of a tire, which is characterized in that a tire blank is heated and vulcanized in a mold, the mold comprises a mold sleeve and upper and lower side plates, the mold sleeve corresponds to a tire crown of the tire blank, and the upper and lower side plates correspond to tire sidewalls of the tire blank, and the method comprises the following steps: (1) Shaping the tire blank of the tire in the mold to obtain a shaped tire blank; (2) Synchronously carrying out internal temperature vulcanization and external temperature vulcanization on the shaped tire blank; the internal temperature vulcanization comprises internal temperature steam vulcanization and nitrogen pressure maintaining in sequence; the internal temperature steam vulcanization comprises internal temperature steam pressing and internal temperature steam condensation discharging; the external temperature vulcanization comprises the step of synchronously heating the tire crown in a steam circulation manner in the die sleeve area and the tire side in a steam circulation manner in the upper side plate area and the lower side plate area; the temperature of the steam circulation heating in the die sleeve area is 150-162 ℃, the temperature of the steam circulation heating in the upper and lower side plate areas is 120-140 ℃, and the temperature of the internal temperature steam adopted for internal temperature steam pressing and internal temperature steam discharging and condensing is 190-205 ℃. The invention adopts steam as a heat source, strictly controls the vulcanization temperature of different parts of the tire blank, thereby realizing and enabling the vulcanization of different parts of the tire blank at proper temperature, ensuring that the temperature rise speed of the whole tire is close in the vulcanization process, realizing the vulcanization uniformity of the tire, controlling the external temperature and the internal temperature of the tire blank and the start and stop time of nitrogen pressure maintaining, and finally shortening the vulcanization time by matching with the technical means.
The invention provides diversified vulcanization temperatures aiming at the vulcanization of the whole tire, and the internal temperature, the external temperature crown part temperature and the external temperature side wall temperature of the tire are respectively different, so that the vulcanization of different parts of a tire blank is realized at proper temperature, the temperature rise speed of the whole tire is close to that of the whole tire in the vulcanization process, and the vulcanization uniformity of the tire is realized; especially the setting of the external temperature of the sidewall is obviously reduced compared with the external temperature in the traditional vulcanization method, thereby saving a large amount of energy. The diversified vulcanization temperature provided by the invention provides more schemes for the optimization of the vulcanization process, and provides a reference value with practical significance for the optimization of the vulcanization process of different types of tire products.
The nitrogen vulcanization method provided by the invention is adopted to vulcanize the green tire of the agricultural radial tire, the degree of over-vulcanization of the sidewall of the agricultural radial tire can be greatly reduced, the tire vulcanization uniformity is improved, the performance of the tire body of the sidewall of the agricultural radial tire is improved, the interlayer adhesion strength of the cord fabric reaches 16.1KN/m and is improved by about 5%, the tensile strength of the sidewall rubber reaches more than 17.5MPa and is improved by about 15%, and the service life of the tire is prolonged.
Detailed Description
The invention provides a nitrogen vulcanization method of a tire, which is characterized in that a tire blank is heated and vulcanized in a mold, the mold comprises a mold sleeve and upper and lower side plates, the mold sleeve corresponds to a tire crown of the tire blank, and the upper and lower side plates correspond to tire sidewalls of the tire blank, and the method comprises the following steps:
(1) Shaping the tire blank of the tire in the mold to obtain a shaped tire blank;
(2) Synchronously carrying out internal temperature vulcanization and external temperature vulcanization on the shaped tire blank;
the internal temperature vulcanization comprises internal temperature steam vulcanization and nitrogen pressure maintaining in sequence; the internal temperature steam vulcanization comprises internal temperature steam pressurization and internal temperature steam condensation discharging;
the external temperature vulcanization comprises the step of synchronously heating the tire crown in a steam circulation manner in the die sleeve area and the tire side in a steam circulation manner in the upper side plate area and the lower side plate area;
the temperature of the steam circulation heating in the die sleeve area is 150-162 ℃, the temperature of the steam circulation heating in the upper and lower side plate areas is 120-140 ℃, and the temperature of the internal temperature steam adopted for internal temperature steam pressing and internal temperature steam discharging and condensing is 190-205 ℃.
The invention shapes the tire blank of the tire in the mold to obtain the shaped tire blank. In the invention, the thickness of the sidewall of the tire blank is preferably 10-25 mm, and the thickness of the crown of the tire blank is preferably 30-150 mm; the invention has no special requirements on the vulcanized capsule adopted for shaping the green tire, and can select the butyl capsule commonly used by the technicians in the field; the invention has no special requirements on the operation process of the green tire shaping, and the conventional operation well known by the technical personnel in the field can be selected. The invention limits the thickness of the tire side and the tire crown, is more favorable for approaching the temperature rise speed of the whole tire in the vulcanization process, and improves the vulcanization uniformity of the tire.
After a shaped tire blank is obtained, carrying out internal temperature vulcanization and external temperature vulcanization on the shaped tire blank synchronously; the internal temperature vulcanization comprises internal temperature steam vulcanization and nitrogen pressure maintaining in sequence; the internal temperature steam vulcanization comprises internal temperature steam pressurization and internal temperature steam condensation discharging; the external temperature vulcanization comprises the step of synchronously heating the tire crown in a steam circulation manner in the die sleeve area and the tire side in a steam circulation manner in the upper side plate area and the lower side plate area; the temperature of the steam circulation heating in the die sleeve area is 150-162 ℃, preferably 153-162 ℃, the temperature of the steam circulation heating in the upper and lower side plate areas is 120-140 ℃, preferably 126-140 ℃, and the temperature of the internal temperature steam used for internal temperature steam pressure and internal temperature steam condensation is 190-205 ℃, preferably 197-203 ℃. In the invention, the specific mode for synchronously carrying out internal temperature vulcanization and external temperature vulcanization on the shaped tire blank is as follows: the internal temperature vulcanization and the external temperature vulcanization are simultaneously finished; the external temperature vulcanization comprises the specific modes of synchronously heating the tire crown in the steam circulation mode in the die sleeve area and the tire side in the steam circulation mode in the upper side plate area and the lower side plate area: and simultaneously finishing the steam circulation heating of the tire crown in the die sleeve area and the steam circulation heating of the tire side in the upper side plate area and the lower side plate area. In the invention, the pressure of the steam circulation in the die sleeve area is preferably 0.4-0.5 MPa, more preferably 0.41-0.45 MPa, and the circulation time is preferably 60-95 min, more preferably 65-95 min; the pressure of the steam circulation in the upper and lower side plate regions is preferably 0.16 to 0.3MPa, more preferably 0.16 to 0.28MPa, and the circulation time is preferably 60 to 95min, more preferably 65 to 95min. The invention adopts steam as a heat source, strictly controls the vulcanization temperature of the external temperature of the tire blank, and vulcanizes different parts of the tire blank, so that the temperature rise speed of the whole tire is close to that of the tire in the vulcanization process, and the vulcanization uniformity of the tire is facilitated.
In the invention, the number of times of internal temperature steam pressurization is preferably 3-5, the number of times of internal temperature steam condensation discharging is preferably 3-5, the first time of internal temperature steam pressurization and the first time of internal temperature steam condensation discharging are preferably carried out synchronously, and then circulation is carried out according to the sequence of internal temperature steam pressurization before internal temperature steam condensation discharging; preferably performing nitrogen pressure maintaining after the internal temperature steam vulcanization is finished; the time for single internal temperature steam pressurization is preferably 2-4 min, and the time for each non-first internal temperature steam condensation discharging is preferably 10-60 s; the specific mode that the first time internal temperature steam is pressurized and the first time internal temperature steam is condensed and discharged preferably and synchronously comprises the following steps: simultaneously ending the first-time internal temperature steam pressurization and the first-time internal temperature steam condensation discharging; the internal temperature steam pressure and the internal temperature steam pressure for discharging and condensing the internal temperature steam are preferably 1.4 to 1.9MPa, and more preferably 1.45 to 1.85MPa. The invention can provide enough heat for vulcanizing and heating the tire and can reduce the temperature of the inner temperature influenced by the accumulation of condensed water in the capsule by limiting the operation modes of the pressurization of the inner temperature steam and the drainage and condensation of the inner temperature steam of the green tire. In the invention, the pressure of the nitrogen gas pressure maintaining is preferably 2.6-3.2 MPa, more preferably 2.65-3.05 MPa, and the pressure maintaining time is preferably 36-88 min40s, more preferably 55-80 min; the nitrogen vulcanization equipment is preferably a 65.5 inch tire shaping vulcanizer.
In order to further illustrate the present invention, the following examples are given to illustrate the nitrogen vulcanization method of the tire according to the present invention in detail, but they should not be construed as limiting the scope of the present invention.
The vulcanizing equipment used in the embodiment of the invention is a shaping vulcanizer with the model of 65.5 inches tire shaping vulcanizer, and a mold of the shaping vulcanizer comprises a mold sleeve and upper and lower side plates, wherein the mold sleeve corresponds to a tire crown of a tire blank, and the upper and lower side plates correspond to tire sidewalls of the tire blank.
Example 1
(1) Shaping a tire blank of a tire in a mold to obtain a shaped tire blank, wherein the bladder is a common butyl bladder, the shaping pressure is 0.06MPa, the thickness of the tire side of the tire is 15mm, and the thickness of the crown part of the tire is 70mm;
(2) After a shaped tire blank is obtained, circularly heating a tire crown by steam in a die sleeve region, circularly heating a tire side by steam in upper and lower side plate regions, and simultaneously finishing the heating of the tire crown and the tire side, wherein the temperature of the steam circulation in the die sleeve region is 155 +/-2 ℃, the pressure is 0.42 +/-0.02 MPa, the time is 83min, the temperature of the steam circulation in the upper and lower side plate regions is 138 +/-2 ℃, the pressure is 0.26 +/-0.02 MPa, and the time is 83min;
when beginning to side wall and crown heating, carry out interior steam to the child blank and suppress and the interior steam row of child blank congeals, specifically do:
pressurizing the green tire by internal temperature steam, and simultaneously discharging and coagulating the internal temperature steam, wherein the pressurizing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 2min;
performing internal temperature steam pressing on the green tire, wherein the pressing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 2min;
keeping the pressing pressure of the green tire to be 1.65 +/-0.2 MPa and the temperature to be 200 +/-3 ℃, and carrying out internal temperature steam condensation discharging on the green tire for 30S;
pressurizing the green tire by using internal temperature steam, wherein the pressurizing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 4min;
keeping the pressing pressure of the green tire to be 1.65 +/-0.2 MPa and the temperature to be 200 +/-3 ℃, and carrying out internal temperature steam condensation discharging on the green tire for 18S;
performing internal temperature steam pressing on the green tire, wherein the pressing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 4min;
keeping the pressurizing pressure of the green tire to be 1.65 +/-0.2 MPa and the temperature to be 200 +/-3 ℃, and carrying out internal temperature steam condensation discharging on the green tire for 12S;
and after the internal temperature steam is pressurized and the internal temperature steam is discharged and condensed, carrying out nitrogen pressure maintaining on the tire blank until the heating of the tire side and the tire crown is finished simultaneously, wherein the nitrogen pressure is 2.8MPa, and the nitrogen pressure maintaining time is 70min.
The vulcanizing time is 83min, compared with the traditional vulcanizing way, the vulcanizing time of the tire with the same model is 100min, the nitrogen vulcanizing process saves 14min, the efficiency is improved by 14%, meanwhile, the overall performance of the tire is not abnormal, the physical properties of the tire crown are normal, the physical properties of the tire side are in a normal range, the tensile strength of the tire side of the tire after nitrogen vulcanization is 14.8MPa, and the tire side strength is equal to that of the vulcanized tire in the traditional vulcanizing process; the adhesion strength between the cord fabric layers of the tire body reaches 15.6KN/m, and is improved by about 2 percent compared with the adhesion strength between the vulcanization wheel layers of the traditional vulcanization process.
Example 2
(1) Shaping the tire blank of the tire in a mold to obtain a shaped tire blank, wherein the bladder is a common butyl bladder, the shaping pressure is 0.06MPa, the thickness of the sidewall of the tire is 15mm, and the thickness of the crown of the tire is 80mm;
(2) After a shaped tire blank is obtained, circularly heating a tire crown by steam in a die sleeve region, circularly heating a tire side by steam in upper and lower side plate regions, and simultaneously finishing the heating of the tire crown and the tire side, wherein the temperature of the steam circulation in the die sleeve region is 155 +/-2 ℃, the pressure is 0.42 +/-0.02 MPa, the time is 77min10S, the temperature of the steam circulation in the upper and lower side plate regions is 140 ℃, the pressure is 0.28MPa, and the time is 77min10S;
when beginning to side wall and crown heating, carry out interior steam to the child blank and suppress and the interior steam row of child blank congeals, specifically do:
pressurizing the green tire by internal temperature steam, and simultaneously discharging and coagulating the internal temperature steam, wherein the pressurizing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 2min;
pressurizing the green tire by using internal temperature steam, wherein the pressurizing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 2min;
keeping the pressing pressure of the green tire to be 1.65 +/-0.2 MPa and the temperature to be 200 +/-3 ℃, and carrying out internal temperature steam condensation discharging on the green tire for 30S;
performing internal temperature steam pressing on the green tire, wherein the pressing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 4min;
keeping the pressing pressure of the green tire to be 1.65 +/-0.2 MPa and the temperature to be 200 +/-3 ℃, and carrying out internal temperature steam condensation discharging on the green tire for 18S;
performing internal temperature steam pressing on the green tire, wherein the pressing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 4min;
keeping the pressurizing pressure of the green tire to be 1.65 +/-0.2 MPa and the temperature to be 200 +/-3 ℃, and carrying out internal temperature steam condensation discharging on the green tire for 12S;
performing internal temperature steam pressing on the green tire, wherein the pressing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 4min;
keeping the pressing pressure of the green tire to be 1.65 +/-0.2 MPa and the temperature to be 200 +/-3 ℃, and carrying out internal temperature steam condensation discharging on the green tire for 10S;
and after the internal temperature steam is pressurized and the internal temperature steam is discharged and condensed, performing nitrogen pressure maintaining on the tire blank until the heating of the tire side and the tire crown is finished simultaneously, wherein the nitrogen pressure is 2.8MPa, and the nitrogen pressure maintaining time is 60min.
The vulcanization time is 77min10S, the overall performance of the tire is not abnormal, the physical properties of the tire crown and the tire side are normal, the tensile strength of the tire side of the tire vulcanized by nitrogen is 15.0MPa, and the tensile strength of the tire side of the tire is about 1.3 percent higher than that of the tire side of the vulcanized tire by the traditional vulcanization process; the interlayer bonding strength of the tire body reaches 15.7KN/m, and the interlayer bonding strength of the vulcanized tire of the traditional vulcanization process is improved by about 3 percent.
Example 3
(1) Shaping a tire blank of a tire in a mold to obtain a shaped tire blank, wherein the bladder is a common butyl bladder, the shaping pressure is 0.06MPa, the thickness of the tire side of the tire is 18mm, and the thickness of the crown part of the tire is 90mm;
(2) After a shaped tire blank is obtained, circularly heating a tire crown by steam in a die sleeve region, circularly heating a tire side by steam in upper and lower side plate regions, and simultaneously finishing the heating of the tire crown and the tire side, wherein the temperature of the steam circulation in the die sleeve region is 155 +/-2 ℃, the pressure of the steam circulation in the die sleeve region is 0.42 +/-0.02 MPa, the time of the steam circulation in the upper and lower side plate regions is 68min, the temperature of the steam circulation in the upper and lower side plate regions is 135 +/-2 ℃, the pressure of the steam circulation in the upper and lower side plate regions is 0.2 +/-0.02 MPa, and the time of the steam circulation in the upper and lower side plate regions is 68min;
when beginning to side wall and child crown heating, carry out interior temperature steam to the child base and suppress and the interior temperature steam of child base row congeals, specifically do:
pressurizing the green tire by internal temperature steam, and simultaneously discharging and coagulating the internal temperature steam, wherein the pressurizing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 2min;
performing internal temperature steam pressing on the green tire, wherein the pressing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 2min;
keeping the pressing pressure of the green tire to be 1.65 +/-0.2 MPa and the temperature to be 200 +/-3 ℃, and carrying out internal temperature steam condensation discharging on the green tire for 30S;
performing internal temperature steam pressing on the green tire, wherein the pressing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 4min;
keeping the pressing pressure of the green tire to be 1.65 +/-0.2 MPa and the temperature to be 200 +/-3 ℃, and carrying out internal temperature steam condensation discharging on the green tire for 18S;
performing internal temperature steam pressing on the green tire, wherein the pressing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 4min;
keeping the pressurizing pressure of the green tire to be 1.65 +/-0.2 MPa and the temperature to be 200 +/-3 ℃, and carrying out internal temperature steam condensation discharging on the green tire for 12S;
and after the internal temperature steam is pressurized and the internal temperature steam is discharged and condensed, carrying out nitrogen pressure maintaining on the tire blank until the heating of the tire side and the tire crown is finished simultaneously, wherein the nitrogen pressure is 2.85 +/-0.2 MPa, and the nitrogen pressure maintaining time is 55min.
The vulcanizing time is 68min, the overall performance of the tire is not abnormal, the physical properties of a tire crown are normal, the physical properties of a tire side are obviously higher than those of the tire prepared by the traditional vulcanizing process, the tensile strength of the tire side of the tire vulcanized by nitrogen is 17MPa, and the tensile strength of the tire side of the tire is about 13% higher than that of the tire side of the vulcanized tire prepared by the traditional vulcanizing process; the interlayer bonding strength of the tire body reaches 16.1KN/m, and the interlayer bonding strength of the vulcanized tire of the traditional vulcanization process is improved by about 5 percent.
Example 4
(1) Shaping a tire blank of a tire in a mold to obtain a shaped tire blank, wherein the bladder is a common butyl bladder, the shaping pressure is 0.08MPa, the thickness of the sidewall of the tire is 20mm, and the thickness of the crown of the tire is 120mm;
(2) After a shaped tire blank is obtained, circularly heating a tire crown by steam in a die sleeve area, circularly heating a tire side by steam in upper and lower side plate areas, and simultaneously finishing the heating of the tire crown and the tire side, wherein the temperature of the steam circulation in the die sleeve area is 160 +/-2 ℃, the pressure is 0.42 +/-0.02 MPa, the time is 95min, the temperature of the steam circulation in the upper and lower side plate areas is 128 +/-2 ℃, the pressure is 0.2 +/-0.02 MPa, and the time is 95min;
when beginning to side wall and crown heating, carry out interior steam to the child blank and suppress and the interior steam row of child blank congeals, specifically do:
pressurizing the green tire by internal temperature steam, and simultaneously discharging and coagulating the internal temperature steam, wherein the pressurizing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 2min;
performing internal temperature steam pressing on the green tire, wherein the pressing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 4min;
keeping the pressing pressure of the green tire to be 1.65 +/-0.2 MPa and the temperature to be 200 +/-3 ℃, and carrying out internal temperature steam condensation discharging on the green tire for 30S;
performing internal temperature steam pressing on the green tire, wherein the pressing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 4min;
keeping the pressurizing pressure of the green tire to be 1.65 +/-0.2 MPa and the temperature to be 200 +/-3 ℃, and carrying out internal temperature steam condensation discharging on the green tire for 18S;
performing internal temperature steam pressing on the green tire, wherein the pressing pressure is 1.65 +/-0.2 MPa, the temperature is 200 +/-3 ℃, and the time is 4min;
keeping the pressing pressure of the green tire to be 1.65 +/-0.2 MPa and the temperature to be 200 +/-3 ℃, and carrying out internal temperature steam condensation discharging on the green tire for 12S;
and after the internal temperature steam is pressurized and the internal temperature steam is discharged and condensed, carrying out nitrogen pressure maintaining on the tire blank until the heating of the tire side and the tire crown is finished simultaneously, wherein the nitrogen pressure is 2.85 +/-0.2 MPa, and the nitrogen pressure maintaining time is 80min.
The vulcanization time is 95min, the overall performance of the tire is not abnormal, the physical properties of the tire crown are normal, the physical properties of the tire side are obviously higher than those of the tire prepared by the traditional vulcanization process, the tensile strength of the tire side of the tire vulcanized by nitrogen is 17.5MPa, and the tensile strength of the tire side of the tire is about 15% higher than that of the tire side of the tire prepared by the traditional vulcanization process; the interlayer bonding strength of the tire body reaches 16.1KN/m, and the interlayer bonding strength of the vulcanized tire of the traditional vulcanization process is improved by about 5 percent.
Comparative example 1
The tire used in example 1 was subjected to a conventional vulcanization process in which the inner temperature was heated by superheated water circulation at 173 ℃ and the outer temperature was heated by steam supplied from a steam chamber at 155 ℃ and 0.45MPa for 100min, the tensile strength of the sidewall of the conventionally vulcanized tire blank was 14.8MPa, and the adhesion strength between carcass plies was 15.24KN/m.
Compared with the comparative example 1, the internal temperature of the nitrogen vulcanization method is obviously higher than that of the traditional vulcanization process, the higher the internal temperature is, the lower the rubber performance is, particularly the excessive vulcanization degree of the parts such as the tire side with less materials can be increased by more than 100%, and the adhesion strength between tire body cord layers and the performance of tire side rubber can be seriously reduced. Therefore, the temperature of the side plate of the sidewall is controlled to be 120-140 ℃, the degree of over-vulcanization of the side part is reduced, and finally the performance of the vulcanized tire is not reduced due to the increase of the internal temperature, but is improved.
In the aspect of external temperature, the traditional steam chamber heating mode belongs to integral heating, so that the steam consumption is large. In the same vulcanization time, the steam consumption of the nitrogen vulcanization method provided by the invention is reduced by 30-40% compared with the steam consumption of the traditional vulcanization method, and the energy is greatly saved.
In conclusion, the nitrogen vulcanization method provided by the invention has the advantages of short vulcanization time, energy conservation, high tensile strength of the tire side, high bonding strength between tire body layers and higher vulcanization effect than that of the traditional vulcanization process.
Performance testing
And performing a tensile test on the sidewall of the nitrogen vulcanized tire blank, specifically performing the tensile test with reference to the national standard GB/T528-2009, and performing an interlayer adhesion strength test on the carcass ply of the nitrogen vulcanized tire, specifically performing the tensile test with reference to the national standard GB/T519-2017.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention in any way. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (7)
1. A nitrogen vulcanization method of a tire is characterized in that a tire blank is heated and vulcanized in a mold, the mold comprises a mold sleeve and upper and lower side plates, the mold sleeve corresponds to a tire crown of the tire blank, and the upper and lower side plates correspond to tire sidewalls of the tire blank, and the method comprises the following steps:
(1) Shaping the tire blank of the tire in the mold to obtain a shaped tire blank;
(2) Synchronously carrying out internal temperature vulcanization and external temperature vulcanization on the shaped tire blank;
the internal temperature vulcanization comprises internal temperature steam vulcanization and nitrogen pressure maintaining in sequence; the internal temperature steam vulcanization comprises internal temperature steam pressing and internal temperature steam condensation discharging;
the external temperature vulcanization comprises the steps of synchronously heating the tire crown in a steam circulation manner in the die sleeve area and heating the tire side in a steam circulation manner in the upper side plate area and the lower side plate area;
the temperature of the steam circulation heating in the die sleeve area is 150-162 ℃, the temperature of the steam circulation heating in the upper and lower side plate areas is 120-140 ℃, and the temperature of the internal temperature steam adopted for internal temperature steam pressure and internal temperature steam condensation is 190-205 ℃.
2. The nitrogen sulfidation process as claimed in claim 1, wherein the steam cycle pressure in the die cavity region of step (2) is 0.4-0.5 MPa and cycle time is 60-95 min.
3. The nitrogen sulfurization method according to claim 1 or 2, wherein the steam cycle in the upper and lower side plate regions in step (2) has a pressure of 0.16 to 0.3MPa and a cycle time of 60 to 95min.
4. The nitrogen vulcanization method of claim 1, wherein the internal temperature steam used for the internal temperature steam pressurization and internal temperature steam condensation removal has a pressure of 1.4 to 1.9MPa.
5. The nitrogen vulcanization method according to claim 1, characterized in that the nitrogen dwell pressure is 2.6 to 3.2MPa, and the dwell time is 36min to 88min40s.
6. The nitrogen vulcanization method according to claim 1 or 4, wherein the number of times of the internal temperature steam pressurization is 3 to 5, the number of times of the internal temperature steam desuperheating is 3 to 5, the first internal temperature steam pressurization and the first internal temperature steam desuperheating are performed simultaneously, and thereafter, the cycle is performed in the order of internal temperature steam depressurization before internal temperature steam desuperheating.
7. The nitrogen vulcanization process of claim 6, wherein the internal temperature steam vulcanization is completed with nitrogen dwell pressure; the time for single internal temperature steam pressurization is 2-4 min, and the time for each non-first internal temperature steam condensation discharging is 10-60 s.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116728860A (en) * | 2023-08-15 | 2023-09-12 | 山东昊华轮胎有限公司 | Total nitrogen vulcanization method and system applied to tire |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116728860A (en) * | 2023-08-15 | 2023-09-12 | 山东昊华轮胎有限公司 | Total nitrogen vulcanization method and system applied to tire |
| CN116728860B (en) * | 2023-08-15 | 2023-10-27 | 山东昊华轮胎有限公司 | Total nitrogen vulcanization method and system applied to tire |
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