GB/T 40725-2021Test method of dipped cord and rubber adhesive peeling performance (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

1 Scope

This document describes the test method for the peel strength of a single dipped cord to the rubber and the rubber coverage of the cord surface after peeling.

This document is applicable to fiber-made dipped cords and rubber vulcanization bonding and peeling performance tests, and peeling performance of dipped yarns, cords and rubber The test can be used as reference.

2 Normative references

The content of the following documents constitutes an indispensable clause of this document through normative references in the text. Among them, dated quotations Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 2941 Rubber Physical Test Method Sample Preparation and Adjustment General Procedure

GB/T 6038 Rubber test compound batching, mixing and vulcanization equipment and operating procedures

GB/T 8170 Numerical rounding rules and the expression and determination of limit values

GB/T 12833 Multimodal curve analysis in the determination of tear strength and adhesive strength of rubber and plastics

GB/T 32110 Terms and definitions of dipped framework materials

3 Terms and definitions

The terms and definitions defined in GB/T 32110 apply to this document.

4 Test principle

A single dipped cord is arranged in a mold according to a certain rule and then made into a sample mold blank with rubber in a certain order, and prepared after vulcanization Into a flat strip sample. Use a tensile testing machine to peel off the adhesion interface between the cord and the rubber in the sample at a constant speed, and determine the peeling The mid-peak value of the peeling force during the process, the ratio of this value to the number of cords in the peeled sample is the peeling force of a single dipped cord, and the unit is N/piece;

After peeling, the ratio of the effective rubber coverage area on the surface of the dipped cord to the effective peeling area is the rubber coverage of the sample. Represented as a percentage.

5 Equipment and tools