NY/T 735-2003 Natural rubber radial tire rubber production process specification
Some standard content:
ICs 83.060
Agriculture Industry Standard of the People's Republic of China NY/T735-~2003
Natural Raw Rubber
Technical Rule for Production of Radial Tire Rubher
Raw natural rubber--Technical rulel for production of radial tire rubher2003-12-01Promulgated
Ministry of Agriculture of the People's Republic of China
Implementation on 2004-03-01
Agriculture Industry Standard of the People's Republic of China
Natural Raw Rubber
Technical Rule for Production of Radial Tire Rubber
AY/T 735-2003
Published by China Standards Press
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Printed by China Standards Press, Jinhuangdao Printing Factory, Xinhua Bookstore, Beijing Distribution Office
Jingben 880 ×123:1/ 6
March 2001
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34 pages
Number of words: 17 「Word
March 2004
Printing number 1--803
Book number: 155066·2.1558#
Price 19.00
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Infringement will be investigated
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Appendix A, Appendix, Appendix and Appendix I of this standard are normative appendices. This standard was proposed by the Agricultural Bureau of the Ministry of Agriculture. This standard was approved by the Technical Committee for Standardization of Tropical Crops and Products of the Ministry of Agriculture. 735—2003
This standard was funded by the South China Tropical Agricultural Products Processing Institute, and the Hainan Garment Bureau and the Yunnan Agricultural Bureau participated in the drafting. The main drafters of this standard are: Deng Jiyong, Zhang Beilong, Lin Zechuan, Miao Xinglan, Zeng Linyin, Biao Diege-A
|1 Scope
Natural raw rubber radial tire rubber production process specification This standard specifies the raw rubber process and technical requirements in the production process of natural rubber radial tire rubber. NY/T 735-2::3
This standard is applicable to radial tire rubber produced with fresh latex-assisted biological coagulant, liquid coagulant, artificially treated coagulant as raw material, or these raw materials blended in a certain proportion.
2 Normative references
The clauses in the following documents become the clauses of the standard through the use of this standard. For all the referenced documents with a specified period, all the amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to discuss whether these documents can be used. The latest version. The following are undated reference documents. The latest version applies to this standard NY/T459 Natural Raw Rubber Tire Rubber 3 Raw Materials Collection
3.1 Collection of Fresh Latex
3.1.1 Collection of Latex
Fresh Latex · Inspection → Filtration → Weighing → Storage 3.1.2 Basic Requirements for Latex Collection
3.1.2.1 When the rubber collection station starts to collect rubber, nitrogen-fixed water should be added to the rubber collection pool in advance. After the collection is completed, the amount of hydrogen added should be controlled within 0.05 (mass fraction) according to the actual amount of latex removed. If conditions permit, try not to add ammonia or add less ammonia: try not to add ammonia to the latex condensed at the rubber station or forest section.
3.1.2.2 The quality of the latex should be strictly inspected when collecting rubber, and the clots and debris in the latex should be removed, and then the latex should be replaced with a 35m10! Filter through stainless steel mesh, weigh and pour into rubber storage tank after filtering. The deteriorated rubber can be left to coagulate naturally [5] and then sent to rubber storage tank for use! 3.2 Collection of rubber garden coagulation
3.2.1 Rubber workers should collect fresh rubber garden coagulation from the forest section in time and send it to the rubber collection station for classification and placement. 3.2.2 The rubber collectors should send the collected net coagulation to the rubber factory in time. 3.2.3 The coagulation that cannot be sent to the rubber factory in time due to special circumstances must be placed in a cool place to prevent the sun from oxidizing and deteriorating. The deteriorated rubber garden coagulation should not be used to produce tire rubber. 3.2.4 The rubber group buried by the workers in the forest section or the rubber collection station should be sent to the rubber factory in time! , 4 Radial tire rubber production process 4.1 Method 1
Fresh milk purification mixing platform biological coagulation → maturation → thinning → pressing → granulation → ... - → slow weighing → packaging → packaging → cupping - * Radial tire rubber +
4.2 Method 2
Artificial treatment of rubber or rubber garden coagulation ... soaking → crushing washing → second pressing granulation → washing and mixing → second pressing granulation · - — 1
NY/T 735—2003
rinse and mix, press once, granulate, load into truck——→dry—→weigh, place and package→mark→line tire rubber mostbzxz.net
4.3 Method three
press once to granulate—rinse and soak
crush and wash
manually handle rubber agglomerates or rubber garden agglomerates
-secondary pressing granulation
—rinse and grip…third pressing granulation
—mix, dry and weigh—
Packing—Marking…Fresh latex of radial tire rubber—→Purification—Mixing
Biological coagulation—Heat-curing bed thinning—Pressing—Pelletizing 5. Production operation and quality control requirements
5.1 Production operation requirements
5.1.1 Treatment of fresh latex
5.1.1.1 The incoming latex should be filtered through a centrifugal settler or a stainless steel sieve with a pore size of 250um (60mm) to remove mud and impurities. 5.1.1.2 The purified latex flows into the mixing tank. When it reaches a certain amount, it is stirred evenly at high temperature. The latex collected and stirred evenly is measured for the gel content according to the method in Appendix A. Then, clear water or whey that meets the quality requirements is added to dilute the latex. The coagulation concentration is required to be not less than the required percentage. Under the premise of not affecting the above process, the original latex concentration should be used as much as possible for coagulation. 5.1.2 Coagulation
5.1.2.1 Fresh latex can be solidified by natural or auxiliary materials at the original concentration in the forest or collection stage. 5.1.2.2 When fresh latex is subjected to auxiliary biological coagulation in the factory, the coagulation materials should be removed in advance. Prepared, the mass fraction of coagulant is 0.1~1.0. The mass fraction of auxiliary materials is 0.15. 5.1.2.3 Coagulation and aging time - more than 16h and less than 215h 5.1.2.4 After the coagulation operation is completed, the mixing tank, glue flow trough and its tools and sites should be cleaned in time. 5.1.3 Treatment of rubber plantation coagulation
After the rubber press coagulation enters the factory, it should be separated by type. And remove the hard objects such as lumps, gold dust, plastic bags, cloth pieces, bark, and wood chips in the rubber plantation coagulation. For the rubber, mud glue, rubber thread, and rubber line that have become sticky due to oxidation, it is not suitable to use the following 4-year tire line rubber, 5.1. 4. Compression, mixing and granulation of wet rubber 5.1.4.1 Before using the material, carefully check and debug all equipment and ensure that all equipment is in good condition. 5.1.4.2 Practical tablet method - when producing, carefully adjust the synchronization of the tablet feeder and the mill. The water content of the wet rubber particles after granulation should not exceed 35% (1 basis point).
5.1.4.3 When using method 2 for production, each production link should be strictly controlled. Mixing and calibration The mixed rubber must be crushed twice and mixed and washed twice to fully remove impurities before it is supplied to the tablets. The mixed rubber must be mixed, pressed, granulated and rinsed twice in a tableting machine. The impurity content of the rubber must be checked regularly after each process, and the washing water must be replaced in time. 5.1.4.4 When using the third method for production, the mixed rubber should be processed according to 5.3.3. The fresh latex gel tablets or charge are mixed with the rubber block tablets or granules in a ratio of 3:1 in a 3" tableting machine. , the whole process of infiltration should be "strictly controlled to ensure the consistency of batch products. 5.1.4.5 When using Fangda method 3 for production, the thickness of the subsequent tablets before the first powder making shall not exceed 5mm. The water content of the flow particles after making shall not exceed the mass fraction% (dry basis). 5.1.4.6 During the process of making the tablets, the tablet machine should ensure the effectiveness of the belt. Generally speaking, the tablet machine standard is about 1mm and 2\ the final tablet machine cylinder distance is about 0.0mm1, 3\ the bamboo tablet machine cylinder money The distance is about 0.2mm. At the same time, the feeding unit cylinder should be controlled in the principle of synchronous reverse movement of the unit and the evaluation machine. 5.1.4.7 Before each use, the dry coal car loaded with wet granules should be carefully cleaned of residual granules and debris, and rinsed with water. 5.1.4.8 After granulation, continue to rinse the equipment with clean water and then transfer it to the machine and clean the site. The granules scattered on the ground should be cleaned and loaded into the granules to be dried. 5.1.5 Drying NY/T 735—2003 5.1. 5.1 Drying temperature and time control: The near-inlet heat return temperature of the drying room or tunnel-type drying cabinet should not exceed 120℃. The drying time should not exceed 1h. The inlet hot air temperature of the shallow drying machine should not exceed 12℃, and the drying time should not exceed 3h. 5.1.5.2 The dried rubber particles should be removed from the drying cabinet and cooled by exhaust air to below 60℃. 5.2 Quality control requirements
5.2.1 Inspection of raw materials and semi-finished products
5.2.1.1 The ammonia content of fresh latex before coagulation (see Appendix 13 for the determination method) should be within 0.03% (mass fraction). 5.2.1.2 The rubber content of rubber garden clots and rubber balls should not be less than 1% by mass. 50 (see Appendix for determination method), the impurity content of agglomerates and artificially treated rubber with too high a mass fraction is not suitable for use in the production of rubber for tires. 5.2.1.3 Rubber agglomerates and artificially treated rubber should be inspected regularly after granulation: the impurity content before granulation should not exceed 0.1 of the mass fraction.
5.2.2 Regulation of Mooney viscosity
After drying, the Mooney viscosity of rubber tires should be set within the range of 83+10 (if conditions permit, it should be set within the range of 83+5), if it exceeds the above range, it may be The following control measures are adopted:
--Adjust the mixing ratio of fresh latex coagulation clot and school latex clot, and adjust the auxiliary materials of biological coagulation: adopt chemical control method: use hydroxyl acid as rubber Mooney viscosity regulator, the maximum amount of hydroxylamine hydrochloride should be controlled within 0.1 mass fraction, and the actual amount should be determined according to production needs. Hydroxylamine hydrochloride can be added to the solution with a mass fraction of 5% to 1% before the school latex coagulation, and can be added to the solution with a mass fraction of 5% to 1.0% by direct spraying. 5.3 Finished product inspection
5.3.1 Quality indicators
According to the requirements of Y/T459.
5.3.2 Sampling
According to the provisions of Record I).
5.3.3 Inspection
According to the inspection method specified in NY/F459. 6
Packaging, marking, storage and transportation
According to the provisions of NY159,
VY/T 735—2003
A.1 Principle
Determination of fresh latex content
Appendix A
(Normative Appendix)
Determination of dry rubber content of fresh latex
Quick determination method
Quick determination method Place the sample in an aluminum pan and heat it to allow the water and volatiles of the fresh latex to evaporate. Then calculate the mass change of the sample before heating and multiply it by the ratio 0.93 to quickly determine the dry rubber content of the fresh rubber. A.2 Instrument
4.2. 1
2 Aluminum pan with inner diameter of about 100 mm.
A.3 Determination steps
Wash and dry a lead pan with inner diameter of about 70 mm and measure accurately to 0.01: add 0.5 g of fresh milk to the pan, accurately to 0.01: add 3 drops of acetic acid solution with a concentration of 5% potassium hydroxide, rotate the pan and mix the sample and acetic acid solution evenly: place the aluminum pan under an alcohol lamp and heat it in an electric furnace, and use a flat glass rod to dry the sample until it becomes yellow and transparent (pay attention to control the temperature to prevent burning the film). Use tweezers to remove the calcium plate. Cool it down. Then carefully roll up all the film on the aluminum plate and weigh the film accurately. 1
A. 4 Calculation of results
The rubber content of fresh latex is expressed as mass fraction W (%). Calculate according to formula (A.1): W.=w3.3.00
The weight of the sample, in grams (g):
The weight after drying, in grams (g)
The difference between the test results should not be too large. Therefore, take the average value. 1
B.1 Principle
Appendix B
(Normative Appendix)
Determination of ammonia content in fresh latex
Nitrogen is an alkali-containing substance. It reacts with acid to neutralize the nitrogen content in latex. B.2 Reaction formula
Nh, + hcI-- NiI c!
13. 3 Reagents
R.3. 1 General
The target reagents are analytical grade reagents
B.3.2 Hydrochloric acid
Formula: 101, molecular weight 36.46, density: 1.8. Purity is 363~.89 mass fraction) R. 3. 3 Ethanol
N1/T 735—20C3
Molecular formula 1.0H.NO. Molecular weight: 16.07. Density: 0.516115.53. Density not less than 65 (mass fraction) B.3.4 Methyl red
Molecular formula, H.N0. Molecular weight: 2G5.29.I. Density range 4.2 (red)-~2 (feed) B.4 Instruments
Ordinary experimental instruments,
B. 5 Determination steps
B.5.1 Preparation of test solution
B.5.1.1 Preparation of carboxylic acid standard solution (cHCl): 9.1 Iol.L Prepare according to (H,T 60G1 —1988-1 2 B. 5.1.2 Tris standard solution (H1) = C. 2 m.15 m. Pipette 50. nIC1)-1 1) Place the solution in a volumetric flask and dilute to the mark with distilled water. The exact concentration of this solution is calculated as one fifth of the standard stock solution. B.5.1.30C, H.-N, 0.05) = 1/3 of each. Weigh 100 ml of 0.1% ethanol solution of 1% ethanol. Place the solution in a dropping bottle with a volume fraction of 1% ethanol. Add 1% ethanol. B.5.2 Determination: Use a 1 ml glass tube to absorb 1 ml of fresh latex (calculated as 1 ml), use filter paper to absorb the latex, put it into a flask filled with distilled water, wash the adhesive part of the pipette with distilled water, then add the red ethanol indicator solution (3.5, 1.6) at the end. Use (.62 mol, 1.1.21 mol) hydrochloric acid standard titration solution 11.1.21 to perform the test. The end point is when the color changes from light yellow to pink. The nitrogen content of the latex at the end is calculated from the result of the standard titration of sodium ions. The nitrogen content W (NI) is calculated as the mass fraction of nitrogen. The calculation is based on the formula (3.1); 5 NY/T 735-2003: 1.703 eV
r-Concentration of standard hydrochloric acid titration solution, unit is mole per (mol/.) V.-Amount of standard hydrochloric acid titration solution consumed. Unit is fin liter ml); said ---Mass value of the sample, unit is gram (g): ... + * B. 1)
C.1 Determination method
Appendix C
(Informative Appendix?
Determination method of rubber garden agglomerates and artificially treated micelles containing rubber disks NY/T 735—2003
Randomly select about 250 rubber samples (accurate to 5 g) from the batch of rubber garden clots or artificially processed rubber raw materials according to the type of raw materials, adjust the roller distance of the sheeting machine to 0.5Tm1m1=0.02mm, and pass the mixed rubber material through the roller 10 times to remove impurities. When passing through the roller for the 2nd to 10th time, the final sheet is cut into two layers and put into the roller for another pass. All the scattered broken rubber is collected and mixed into the roller and then dry mixed for 0 times. When passing through the roller for the 19th time, the film is cut into two layers and passed through the roller. After the 10th pass, the sheet is removed and weighed (accurate to 5g). Take about 20g of the sample (accurate to 0.01g) from the cavity sample after the dry roller. Cut the sample into 2 n1m Wide strips, then put it in an electric drying oven with a temperature of 100℃ and 0.5℃, and dry it for about 4 hours. After the sample is completely dry, take it out and place it in a dryer to cool to room temperature, and weigh it. C.2 Calculation of results
C.2.1 Water and impurity removal rate is expressed as mass fraction W), and the value is expressed as %. Calculate according to formula (1): W,=(\-m
Wu Zhong:
The mass of the rubber sample before passing the roller. The unit is gram (); The mass of the rubber sample after passing the roller, the unit is gram (g); mm1)× 100
-The mass of the sample taken from the rubber sample after passing the roller. The unit is gram (&); m
The mass of the sample after drying, the unit is gram (g). C.2. 2 Dry rubber content C is calculated according to formula (C,2): C(%) -- 100 --- W..
NY/T735---2003
D.1 Instruments and equipment
Appendix D
(Normative Appendix)
Production inspection of radial tire rubber
Laboratory rubber refining: sampling force: sample bag: inspection equipment, etc. D.2 Inspection steps and requirements
D,2.1 Sampling frequency
The sampling frequency of grade 1 rubber is 2.5: the sampling frequency of grade 1 rubber is 10. D.2.2 Sampling method
D,2.2.1 After the tire rubber is packaged, take samples according to the provisions of D.2.1. D.2.2.2 Place the rubber block that has been compacted by the baler but not yet packaged on a clean platform. 1:. Make the shortest edge between the two rectangular blocks. Use a clean knife to cut along the vertical edge of the rubber block to separate a small triangular rubber block (about 50 mm×50 mm×70 mm). Its mass is not less than 180%. Then make a small triangular rubber block of the same size on the diagonal edge and put them together to form an empty experimental sample representing this package. Put it into a polyethylene bag together with the label and seal the bag immediately. D.2.3 Homogenization of samples
Weigh the laboratory sample accurately to 0.1g. Adjust the roller distance of the mill to 1.3tim10.i5mm, and keep the temperature at 70℃+5°::. Repeat 10 times to make the laboratory sample homogenous. During the 2nd to 9th roller pass, roll the film and put one end of the film vertically between the two rollers and roll it again. The scattered film will be mixed into the sample and rolled again. After the 10th roller pass, take the film off and weigh it again with an accuracy of 0.1g. 2. 4 Inspection requirements
D.2.4.1 The samples shall be tested for impurity content, ash content, volatile matter content, nitrogen content, acetone extract content, initial plasticity value, plasticity retention rate, Mooney viscosity and tensile strength of vulcanized rubber according to the method specified in VY/T459. D.2.4.2 Each sample in the sample shall be tested for impurity content, plasticity retention rate and Mooney viscosity. One sample shall be taken every three samples for ash content measurement. One sample shall be taken every six samples for volatile matter content, fluorine content, acetone extract content, initial plasticity value and tensile strength of vulcanized rubber (if carbon content, volatile matter content, nitrogen content, acetone extract content and initial plasticity value are found, each sample in the sample shall be tested for such measurement). For the tensile strength of vulcanized rubber, laboratory mixed samples shall be taken for measurement. Copyright reserved. Infringement will be investigated.
Book: 1550662-15788
NY/T 735-2003
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