GB/T 28610-2020Methyl vinyl silicone rubber (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 28610-2012 "methyl vinyl silicone rubber". Compared with GB/T 28610-2012, except for editorial changes The main technical changes are as follows.

--- Added some normative references (see Chapter 2);

--- "Classification" modified to "brand" (see Chapter 3, Chapter 3 of the 2012 edition);

--- 110 type methyl vinyl silicone rubber added grade MVQ110-0 and its technical requirements (see 4.1);

--- 112 type methyl vinyl silicone rubber added grade MVQ112-0 and its technical requirements (see 4.2);

--- Revised the technical index of relative viscosity average molecular weight and volatile content (see Chapter 4, Chapter 4 of the 2012 edition);

--- Increase the relative viscosity average molecular weight by increasing the Mooney viscosity method (see 5.1.2 and Appendix B);

--- Determination of the molar fraction of vinyl chains by adding near-infrared spectroscopy (see 5.2.2);

--- Deleted the determination of molecular weight (visual method) (see Appendix E of the 2012 edition);

--- The order of appendices has been adjusted (Appendix C, Appendix D, and Appendix E of this edition correspond to Appendix B, Appendix C, and Appendix D of the 2012 edition, respectively).

1 Scope

This standard specifies the grades, requirements, test methods, inspection rules, signs, packaging, transportation, and specifications of methyl vinyl silicone rubber (MVQ). Storage.

This standard applies to dimethylsiloxane mixed ring and methylvinylcyclosiloxane as the main raw materials.

Methyl vinyl silicone rubber obtained by polymerization reaction under the capping effect of siloxane or methyl capping agent.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document. Preparation of GB/T 601 chemical reagent standard titration solution

GB/T 1232.1-2016 Unvulcanized rubber for determination by disc shear viscometer Part 1: Determination of Mooney

GB/T 5577 synthetic rubber grade specifications

GB/T 6678 General sampling rules for chemical products

GB/T 6679 General rules for sampling solid chemical products

GB/T 6682 Analytical laboratory water specifications and test methods

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

GB/T 12804 Laboratory glass instrument measuring cylinder

GB/T 12806 Laboratory glass instrument single marking volumetric flask

GB/T 19188 Guidelines for storage of natural and synthetic rubber

GB/T 36691 Determination of vinyl content of methyl vinyl silicone rubber Near-infrared method

3 Grades

According to the principles stipulated in GB/T 5577, the grades of methyl vinyl silicone rubber are sequentially expressed by the combination of the following letters and numbers.

--- The rubber code is represented by MVQ;

--- High temperature curing type is represented by the number 1;

--- Vinyl-containing substituents are represented by the number 1;

--- Vinyl end cap is represented by the number 0; methyl end cap is represented by the number 2;

--- The molar fraction of vinyl chain links is represented by 0, 1, 2 and 3 (from Table 1 and Table 2). Example:

The grade of vinyl-terminated methyl vinyl silicone rubber with a vinyl chain molar fraction of 0.07% to 0.12% is. MVQ110-1.

4 Requirements