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A method of testing the real scorch time of silica rubber

A technology of scorch time and silica, which is applied in the field of real scorch time measurement of compounds containing silica, which can solve the problem of poor physical properties, increase in rubber torque, and decrease in Mooney scorch time, etc. question

Active Publication Date: 2021-03-23
ZHONGCE RUBBER GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This caused the silica formulation to test the Mooney scorch time. Due to the accumulation of a large amount of silica and the formation of a cross-linked network, the torque of the compound in the mold cavity increased rapidly, and the Mooney scorch time was greatly reduced.
In order to prolong the scorch time, formulation engineers have to add anti-scorch agents or adjust the vulcanization system, but these will bring other negative effects to the formulation, such as blooming and poor physical properties

Method used

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  • A method of testing the real scorch time of silica rubber
  • A method of testing the real scorch time of silica rubber
  • A method of testing the real scorch time of silica rubber

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Design test formula, specifically as shown in the following table 1 (number of parts phr):

[0029] Table 1

[0030]

[0031]

[0032] Details of raw materials used in the formula: solution polystyrene butadiene rubber, 2438-2HM, Lanxess chemical products; butadiene rubber, BR9000, products of PetroChina Daqing Petrochemical Branch; white carbon black, 1165MP, Solvay chemical products; silane coupling Agent Si69, Hongbai chemical products; softening oil, TDAE, Hansheng chemical products; other raw materials are commercially available industrial grade products.

[0033] Put the above four formulas into an internal mixer for mixing, and use the same process for mixing, as follows.

[0034] Rotor speed: 50rpm; initial temperature: 60°C; filling factor: 0.7.

[0035] Add all the rubber at 0 seconds; add 1 / 2 of the total amount of silica and all fine materials, silane coupling agent at 30 seconds; add the remaining silica at 60 seconds.

[0036] Add softened oil whe...

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PUM

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Abstract

The invention aims to provide a method for testing real scorch time of white carbon black rubber. The detection method is simple to operate, high in reproducibility and accurate in judgment. Tests areconducted in reference to a rubber rheometer, a rubber processing analyzer (RPA2000) is used for performing time scanning on the white carbon black rubber, and the time corresponding to 10% increaseof dynamic modulus is taken as the real scorch time.

Description

technical field [0001] The invention relates to the application field of industries such as tires and rubber products, and in particular to a measurement of real scorch time of a white carbon black-containing formula compound applied to tires and rubber products. Background technique [0002] Early scorch refers to the early vulcanization behavior of rubber compounds during processing. The occurrence of scorch will lead to an increase in the viscosity of the rubber compound and reduce the processability of the rubber compound. In the general ASTM D1646-17, the Mooney viscometer is used to measure the scorch time, wherein the Mooney scorch time (T5) is defined as the time required for the torque to rise 5 units from the minimum value. The ASTM test methods described above are widely used in the rubber industry. [0003] Since the 1950s, white carbon black has been used in rubber compounds to replace carbon black in a small amount, which can improve the tear strength. In th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/12
CPCG01N31/12
Inventor 王丹灵承齐明陈生任福君张麟
Owner ZHONGCE RUBBER GRP CO LTD