Ultra-low-temperature adhesive for retreading precured tyre and manufacturing process

Abstract

The invention relates to an ultra-low-temperature adhesive for retreading a precured tyre, which comprises the following raw materials in parts by weight: 100 of natural standard rubber, 1.1 to 1.6 of promoter M, 1.4 to 2 of promoter D, 0.8 to 1.2 of sulfur, 0.7 to 0.9 of promoter TMTD, 20 to 28 of carbon black N754, 10 to 15 of carbon black N 330, 5 of zinc oxide, 2 to 2.5 of stearic acid, 0.7 to 0.9 of anti-aging agent MB, 1 to 1.3 of anti-aging agent 4020, 0.9 to 1.2 of anti-aging agent TNP, 0.7 to 1 of anti-aging agent RD, 0.8 to 1.1 of antioxidant, 1.2 to 1.6 of dispersant and 0.04 to 0.06 of anti-scorching agent; and the invention also discloses a manufacturing process. The invention is an ultra-low-temperature vulcanization process for retreading the tyre and a matching tread adhesive and has good aging resistance, high safety, energy saving, low cost and high qualified rate of a product; and the invention is beneficial to increasing the service life and the retreading frequency of the tyre.

Description

technical field [0001] The invention relates to a tire retreading technology, in particular to a prevulcanized tire retreading ultra-low temperature adhesive glue and a manufacturing process. Background technique [0002] In the prior art, the tire retreading vulcanization process of the pre-cured tread method adopts the tank vulcanization method: an outer envelope is installed on the outside of the tire, an inner tube or an inner envelope is installed inside the tire, and the air is exhausted from the contact interface between the envelope and the tire surface to achieve A certain vacuum state, then put into the tank and vulcanize under the conditions of an appropriate air pressure of about 0.6Mpa, a temperature of 115°C and a time of 2.5 to 3 hours, most of which are vulcanized at 115°C for 3 hours. [0003] Reducing the vulcanization temperature and shortening the vulcanization time of tire retreading plays an important role in improving the number of tire retreads and se...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned technology still has the following deficiencies: 1. The practicability is limited and it is difficult to popularize. Due to the factors determined by the above-mentioned vulcanization system, the manufacturability of the rubber material is not good, the preparation operation is difficult, and scorching easily occurs when the rubber material is heated out of the mold. And scrapping, it is not convenient for rubber preparation and practical application. In addition, the storage temperature is required to be below 25°C, which brings difficulties to the storage and transportation of the rubber, and is difficult to popularize; When used in summer, it will increase the quality problems such as tread rubber falling off and the incidence of safety accidents; 3. The service life of the tire is shortened and the tires are retreaded many times. Due to the high vulcanization temperature, the heat aging of the tire is relatively high during the retreading vulcanization process. Fast; 4. It is not conducive to energy saving. A higher tire retreading autoclave temperature drop will increase the time required to achieve positive vulcanization and the heat dissipation on the surface of the autoclave; 5. The production cost is high. Due to the high vulcanization temperature, the vulcanization of the envelope will be accelerated. and the aging of the inner tube, reducing the number of times of use; 6. It affects the qualified rate of the product. When the air humidity is high (such as summer and rainy weather), if the tire is damp to a certain extent or not dried as required, when the vulcanization is completed, the exhaust will be released. When pressing, the damp tire between the cord layers will expand due to the vulcanization temperature at or above the boiling point of water, and the water vapor in the damp area will cause quality problems such as carcass bulging and emptying.