A laboratory test method for the isolation effect of capsule isolation agent or internal spray agent

Abstract

The present invention belongs to the field of tire manufacturing, and specifically relates to a laboratory detection method for the isolation effect of a capsule isolation agent or an internal spray coating agent. The method can evaluate the isolation effect of the capsule isolation agent / internal spray coating agent in a relatively short time (0.5-2 hours). Previous evaluation experience shows that this method has strong reproducibility. Compared with the actual use effect in the workshop, this evaluation method has high accuracy.

Description

Technical Field

[0001] The invention relates to the field of tire manufacturing, and in particular to a laboratory detection method for the isolation effect of a capsule isolation agent or an internal spray coating agent. Background Art

[0002] At present, the manufacture of almost all tires is inseparable from vulcanization bladders. The average service life of vulcanization bladders is generally 200-600 times. The length of its service life directly affects the production efficiency and production cost of tires: 1) Low-life vulcanization bladders are frequently replaced, and the vulcanization machine stops working during the replacement period, resulting in reduced production efficiency. Assuming that it takes 15 minutes to replace a bladder and 12 minutes to vulcanize a tire, a bladder with a service life of 600 times can produce at least 15 more tires per month than a bladder with a service life of 200 times; 2) Low-life vulcanization bladders are very likely to cause tire scrapping, increase the scrap rate, and increase production costs. Therefore, it is crucial to increase the service life of vulcanization bladders.

[0003] There are many ways to increase the life of the capsule, among which the most commonly used ones are through adjusting the rubber formula and applying a pretreatment agent on the capsule surface. The Chinese invention patent application (application number: 202010446176.5, application date: 2020.05.25) discloses a tire vulcanization capsule that effectively increases the service life and a preparation method thereof. By pretreating the surface of the vulcanization capsule, a dense and rubber-elastic film is formed on the surface of the capsule, thereby isolating the capsule from oxygen, thereby greatly extending the service life of the capsule.

[0004] The reasons for the low life of the curing bladder include the quality of the bladder itself, sand holes, capsule scars, mechanical damage, etc. Capsule scars are one of the important influencing factors, and the isolation effect of the capsule isolation agent / internal spray agent has a greater impact on capsule scars. However, there are currently few methods for evaluating the isolation effect of capsule isolation agents / internal spray agents, especially laboratory testing methods. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a laboratory detection method for the isolation effect of capsule isolation agents or internal spray agents. This method efficiently evaluates the isolation effect of capsule isolation agents / internal spray agents, is easy to operate, has high evaluation efficiency, strong reproducibility, and accurate judgment.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A laboratory testing method for the isolation effect of a capsule isolation agent or an internal spray agent, the method comprising the following steps:

[0008] 1) Prepare test materials: the capsule isolation agent or internal spray agent to be evaluated, several pieces of uncured airtight layer rubber, and several pieces of capsule standard samples;

[0009] 2) Sample preparation: Take the release agent or internal spray agent of the capsule to be tested and drop it on the center of the patterned side of the capsule standard sample, and spread it evenly, then place it on a smooth flat plate in a flat vulcanizer, with the release agent or internal spray agent side facing up;

[0010] 3) Take two pieces of unvulcanized airtight layer film and place them in the vulcanization mold, and then place them on the capsule standard sample coated with the release agent or the inner spray agent. One side of the unvulcanized airtight layer film is attached to the capsule standard sample coated with the release agent or the inner spray agent, and then close the mold for vulcanization;

[0011] 4) Take out, remove the airtight layer film, replace with a new film and repeat step 3), vulcanize 10 times in total;

[0012] 5) If there is a situation in the middle that cannot be peeled off, stop;

[0013] 6) If the capsule standard sample and the airtight layer film can still be peeled off after 10 times of vulcanization, put the capsule standard sample after 10 times of vulcanization under an optical electron microscope and magnify it 50 times to take a picture. Take a picture of the left and right covering positions to see the residual isolation agent or internal spraying agent liquid at the position covered by the airtight layer film. The optical microscope directly reads the average area A of the left and right sides of the residual liquid 试 and the A of the standard sample after 10 repetitions 标 , the residual ratio is calculated according to the following formula:

[0014] Residual ratio = A 试 / A 标

[0015] The larger the residual ratio, the better the isolation effect; if the residual ratio is 1, it means that the isolation effect of the isolation agent or internal spray agent is the same as that of the isolation agent or internal spray agent used in the standard sample; if the residual ratio is greater than 1, it means that it is better than the standard sample; if it is less than 1, it means that it is worse than the standard sample.

[0016] Preferably, in step 3), the vulcanization pressure is 10 MPa, the vulcanization temperature of the plate vulcanizer is 130-180°C, and the vulcanization time is 3-60 minutes. More preferably, in step 3), the vulcanization temperature of the plate vulcanizer is 160-180°C, and the vulcanization time is 3-15 minutes.

[0017] Preferably, in step 3), a vulcanization plate is further provided in the vulcanization mold, and a through hole for placing an airtight layer film is provided on the vulcanization plate, and the airtight layer film is provided in the through hole, and the upper part of the airtight layer film contacts the upper plate of the vulcanization mold, and the lower part contacts the capsule standard sample coated with a release agent or an inner spray agent, and the standard sample contacts the lower plate. More preferably, a glue overflow groove is provided on the outer side of the through hole, and the width of the glue overflow groove is 5 mm and the depth is 1-3 mm.

[0018] Preferably, the unvulcanized airtight layer rubber refers to the airtight layer rubber sheet after final refining, which is thinned through an open mixing mill for 5 times and then rolled into a uniform test piece with a thickness of 6 mm on the open mixing mill, and then cut into a rectangular piece with a length of 12 cm and a width of 4 cm with scissors.

[0019] Preferably, the capsule standard sample refers to a standard sample cut from the flat position of a normally used new capsule, with a size of 28 cm in length and 18 cm in width.

[0020] Due to the adoption of the above technical solution, the present invention can evaluate the isolation effect of the capsule isolation agent / internal spray agent in a relatively short time (0.5-2 hours). Previous evaluation experience shows that this method has strong reproducibility. Compared with the actual use effect in the workshop, this evaluation method has high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the arrangement of the airtight layer film flat vulcanizing machine of the present invention.

[0022] Figure 2 Schematic diagram of the structure of the vulcanized plate. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to fully describe the technical solutions in the embodiments of the present invention, and then further explain the invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Given the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example 1

[0025] 1) Prepare the test materials: capsule isolation agent 1-4# to be evaluated, standard isolation agent, 100 pieces of uncured flat airtight layer glue with a length of 12cm, a width of 4cm and a thickness of 12cm, and 5 pieces of capsule standard samples with a length of 28cm and a width of 18cm;

[0026] Use the isolation agents 1-4# according to the following steps

[0027] 2) Sample preparation: Take 5 ml of the test capsule release agent and drop it on the center of the capsule standard sample (the side with the pattern), and evenly apply it on the capsule standard sample, and then place it on the smooth flat plate in the flat plate vulcanizer with the release agent side facing up;

[0028] 3) Take two uncured airtight layer films and place them in a specific vulcanization mold, and then place them on the capsule standard sample coated with the release agent. One side of the uncured airtight layer film is attached to the capsule standard sample coated with the release agent. Close the mold for vulcanization, the vulcanization pressure is 10MPa, the vulcanization temperature of the flat vulcanizer is 180℃, and the vulcanization time is 3 minutes; Figure 1 , Figure 2As shown, a vulcanization plate 2 is also provided in the vulcanization mold, and a through hole 6 for placing an airtight layer film 4 is provided on the vulcanization plate 2. The airtight layer film 4 is arranged in the through hole 6, and the upper part of the airtight layer film 4 contacts the upper plate 1 of the vulcanization mold, and the lower part contacts the capsule standard sample coated with a release agent or an inner spray agent, and the standard sample contacts the lower plate 3. A glue overflow groove 7 is provided on the outer side of the through hole 6, and the width of the glue overflow groove 7 is 5 mm and the depth is 1-3 mm.

[0029] 4) Take out, remove the airtight layer film, replace with a new film and repeat step 3), vulcanize 10 times in total;

[0030] 5) If there is a situation in the middle that cannot be peeled off, stop;

[0031] 6) If the capsule standard sample and the airtight layer film can still be peeled off after 10 times of vulcanization, put the capsule standard sample after 10 times of vulcanization under an optical electron microscope and magnify it 50 times to take a picture. Take a picture of the left and right covering positions once to see the residual release agent liquid at the position covered by the airtight layer film. The optical microscope directly reads the average area A of the left and right sides of the residual liquid 试 and the A of the standard sample after 10 repetitions 标 The residual ratio is calculated as follows:

[0032] Residual ratio = A 试 / A 标

[0033] Table 1

[0034] Standard release agent Release agent 1# Release agent 2# Release agent 3# Release agent 4# Survival rate 0.99 1.32 0.85 1.20 Unable to peel off Unable to peel within 10 times (number of vulcanization times when peeling is impossible) 9

[0035] Example 2

[0036] 1) Prepare the test materials: capsule isolation agent 1-4# to be evaluated, standard isolation agent, 100 pieces of uncured flat airtight layer glue with a length of 12cm, a width of 4cm and a thickness of 12cm, and 5 pieces of capsule standard samples with a length of 28cm and a width of 18cm;

[0037] Use the isolation agents 1-4# according to the following steps

[0038] 2) Sample preparation: Take 5 ml of the test capsule release agent and drop it on the center of the capsule standard sample (the side with the pattern), and evenly apply it on the capsule standard sample, and then place it on the smooth flat plate in the flat plate vulcanizer with the release agent side facing up;

[0039] 3) Take two uncured airtight layer films and place them in a specific vulcanization mold, and then place them on the capsule standard sample coated with the release agent. One side of the uncured airtight layer film is attached to the capsule standard sample coated with the release agent. Close the mold for vulcanization. The vulcanization pressure is 10MPa, the vulcanization temperature of the flat vulcanizer is 170℃, and the vulcanization time is 6 minutes.

[0040] 4) Take out, remove the airtight layer film, replace with a new film and repeat step 3), vulcanize 10 times in total;

[0041] 5) If there is a situation in the middle that cannot be peeled off, stop;

[0042] 6) If the capsule standard sample and the airtight layer film can still be peeled off after 10 times of vulcanization, put the capsule standard sample after 10 times of vulcanization under an optical electron microscope and magnify it 50 times to take a picture. Take a picture of the left and right covering positions once to see the residual release agent liquid at the position covered by the airtight layer film. The optical microscope directly reads the average area A of the left and right sides of the residual liquid 试 and the A of the standard sample after 10 repetitions 标 The residual ratio is calculated as follows:

[0043] Residual ratio = A 试 / A 标

[0044] Table 2

[0045] Standard release agent Release agent 1# Release agent 2# Release agent 3# Release agent 4# Survival rate 0.99 1.31 0.86 1.22 Unable to peel off Unable to peel within 10 times (number of vulcanization times when peeling is impossible) 8

[0046] Example 3

[0047] 1) Prepare the test materials: capsule isolation agent 1-4# to be evaluated, standard isolation agent, 100 pieces of uncured flat airtight layer glue with a length of 12cm, a width of 4cm and a thickness of 12cm, and 5 pieces of capsule standard samples with a length of 28cm and a width of 18cm;

[0048] Use the isolation agents 1-4# according to the following steps

[0049] 2) Sample preparation: Take 5 ml of the test capsule release agent and drop it on the center of the capsule standard sample (the side with the pattern), and evenly apply it on the capsule standard sample, and then place it on the smooth flat plate in the flat plate vulcanizer with the release agent side facing up;

[0050] 3) Take two uncured airtight layer films and place them in a specific vulcanization mold, and then place them on the capsule standard sample coated with the release agent. One side of the uncured airtight layer film is attached to the capsule standard sample coated with the release agent. Close the mold for vulcanization. The vulcanization pressure is 10MPa, the vulcanization temperature of the flat vulcanizer is 160℃, and the vulcanization time is 10 minutes.

[0051] 4) Take out, remove the airtight layer film, replace with a new film and repeat step 3), vulcanize 10 times in total;

[0052] 5) If there is a situation in the middle that cannot be peeled off, stop;

[0053] 6) If the capsule standard sample and the airtight layer film can still be peeled off after 10 times of vulcanization, put the capsule standard sample after 10 times of vulcanization under an optical electron microscope with a magnification of 50 times, and take a picture of the left and right covering positions once each, and observe the residual isolation agent liquid at the position covered by the airtight layer film. The optical microscope directly reads the average area A of the left and right sides of the residual liquid 试 and the A of the standard sample after 10 repetitions 标 The residual ratio is calculated as follows:

[0054] Residual ratio = A 试 / A 标

[0055] Table 3

[0056] Standard release agent Release agent 1# Release agent 2# Release agent 3# Release agent 4# Survival rate 1.01 1.30 0.87 1.21 Unable to peel off Unable to peel within 10 times (number of vulcanization times when peeling is impossible) 9

[0057] The four release agents evaluated in Examples 1-3 and one standard release agent, a total of five release agents, were used to evaluate the tire vulcanization effect in the workshop, and the service life of the capsules when different release agents were used was tested. To avoid the influence of other factors, the same batch of capsules and tires of the same specifications were selected and tested on the same vulcanization machine. To verify the repeatability, a total of five groups of vulcanization machines were selected, and the results are as follows:

[0058] Capsule life Standard release agent Release agent 1# Release agent 2# Release agent 3# Release agent 4# Vulcanizing machine 1 421 462 388 452 357 Vulcanizing machine 2 408 444 378 436 354 Vulcanizing machine 3 416 456 395 438 367 Vulcanizing machine 4 423 468 386 440 363 Vulcanizing machine 5 428 472 402 454 343

[0059] By comparing Examples 1-3, it can be seen that the residual rate of the release agent after the test is positively correlated with the service life of the corresponding release agent capsule, and the repeatability is good.

[0060] Industrial Applicability

[0061] The above is a description of the embodiments of the present application. Through the above description of the disclosed embodiments, professionals and technicians in this field can implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in this field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown in this article, but will comply with the widest range consistent with the principles and novelties disclosed herein.

Claims

1. A laboratory test method for the isolation effect of a capsule isolation agent or an internal spray agent, characterized in that: The method comprises the following steps: 1) Prepare test materials: the capsule isolation agent or internal spray agent to be evaluated, several pieces of uncured airtight layer rubber, and several pieces of capsule standard samples; 2) Sample preparation: Take the release agent or internal spray agent of the capsule to be tested and drop it on the center of the patterned side of the capsule standard sample, and spread it evenly, then place it on a smooth flat plate in a flat vulcanizer, with the release agent or internal spray agent side facing up; 3) Take two pieces of unvulcanized airtight layer film and place them in the vulcanization mold, and then place them on the capsule standard sample coated with the release agent or the inner spray agent. One side of the unvulcanized airtight layer film is attached to the capsule standard sample coated with the release agent or the inner spray agent, and then close the mold for vulcanization; 4) Take out, remove the airtight layer film, replace with a new film and repeat step 3), vulcanize 10 times in total; 5) If there is a situation in the middle that cannot be peeled off, stop; 6) If the capsule standard sample and the airtight layer film can still be peeled off after 10 times of vulcanization, put the capsule standard sample after 10 times of vulcanization under an optical electron microscope and magnify it 50 times to take a picture. Take a picture of the left and right covering positions to see the residual isolation agent or internal spraying agent liquid at the position covered by the airtight layer film. The optical microscope directly reads the average area A of the left and right sides of the residual liquid 试 and the A of the standard sample after 10 repetitions 标 , the residual ratio is calculated according to the following formula: Residual ratio = A 试 / A 标 The larger the residual ratio, the better the isolation effect; if the residual ratio is 1, it means that the isolation effect of the isolation agent or internal spray agent is the same as that of the isolation agent or internal spray agent used in the standard sample; if the residual ratio is greater than 1, it means that it is better than the standard sample; if it is less than 1, it means that it is worse than the standard sample.

2. The laboratory detection method of the isolation effect of a capsule isolation agent or an internal spray agent according to claim 1, characterized in that: Step 3) The vulcanization pressure is 10MPa, the vulcanization temperature of the flat vulcanizer is 130-180℃, and the vulcanization time is 3-60 minutes.

3. A laboratory test method for the isolation effect of a capsule isolation agent or an internal spray agent according to claim 2, characterized in that: Step 3) The vulcanization temperature of the flat vulcanizer is 160-180°C and the vulcanization time is 3-15 minutes.

4. The laboratory testing method for the isolation effect of a capsule isolation agent or an internal spray agent according to claim 1, characterized in that: Step 3) A vulcanization plate is also provided in the vulcanization mold, and a through hole for placing an airtight layer film is provided on the vulcanization plate. The airtight layer film is arranged in the through hole, and the upper part of the airtight layer film contacts the upper plate of the vulcanization mold, and the lower part contacts the capsule standard sample coated with a release agent or an internal spray agent, and the standard sample contacts the lower plate.

5. A laboratory test method for the isolation effect of a capsule isolation agent or an internal spray agent according to claim 4, characterized in that: A glue overflow groove is arranged on the outer side of the through opening, and the width of the glue overflow groove is 5mm and the depth is 1-3mm.

6. The laboratory testing method for the isolation effect of a capsule isolation agent or an internal spray agent according to claim 1, characterized in that: Unvulcanized airtight layer rubber refers to the airtight layer rubber sheet after the final refining. After being thinned on the open mixing mill for 5 times, it is stripped into a uniform test piece with a thickness of 6 mm on the open mixing mill, and cut into rectangular pieces with a length of 12 cm and a width of 4 cm with scissors.

7. The laboratory testing method for the isolation effect of a capsule isolation agent or an internal spray agent according to claim 1, characterized in that: The capsule standard sample refers to the standard sample cut from the flat position of a normally used new capsule, with a size of 28cm in length and 18cm in width.

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