Methyl‑Phenyl MQ Silicone Resin CAS 67763‑19‑3 is synthesized via co‑hydrolysis and polycondensation of methyl silane, phenyl silane and tetrafunctional silicate monomers. Both methyl and phenyl groups are distributed on the three‑dimensional M‑Q siloxane skeleton. The ratio of methyl to phenyl can be adjusted during production. This resin is used for outdoor weatherable silicone coatings, modified silicone rubber and silicone adhesives, balancing low‑temperature flexibility and high‑temperature

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Methyl‑Phenyl MQ Silicone Resin CAS 67763‑19‑3, Weatherable MQ Resin for Outdoor Coating Silicone Rubber & Adhesive

This methyl‑phenyl co‑modified MQ silicone resin is produced through controlled co‑hydrolysis and polycondensation of methyl alkoxysilane, phenyl alkoxysilane and tetraalkoxysilane precursors. The molecular structure is built from monofunctional M‑units and tetrafunctional Q‑units. Methyl groups provide good low‑temperature flexibility and hydrophobic property, while rigid phenyl segments endow the resin with superior thermal‑oxidative stability and UV‑shielding capability. The methyl‑phenyl proportion can be tailored to satisfy different formulation requirements of outdoor coating, silicone rubber and adhesive.

Compared with pure methyl MQ resin, the introduction of phenyl groups improves long‑term anti‑ageing performance under strong ultraviolet irradiation and high‑temperature conditions. In contrast to high‑phenyl MQ resin, retained methyl components prevent excessive brittleness of cured silicone systems and maintain acceptable low‑temperature flexibility. This balanced molecular characteristic makes the resin well‑suited for outdoor exposure applications.

When incorporated into outdoor silicone coating formulations, the resin functions as a film‑forming and reinforcing component. It increases coating surface hardness and scratch resistance, restrains chalking and yellowing under prolonged outdoor sunlight exposure, and enhances adhesion toward metal and mineral building substrates.

For silicone rubber compounding, methyl‑phenyl MQ resin acts as reinforcing filler. It improves tensile strength and tear resistance of vulcanized rubber. The finished rubber exhibits better thermal ageing resistance than conventional methyl‑based silicone rubber, while still retaining acceptable elasticity at low‑temperature operating environments.

Within silicone adhesive systems, the resin works as a tackifier. It elevates cohesive strength and high‑temperature holding power of silicone adhesives without causing excessive brittleness. It helps the adhesive layer maintain stable bonding performance under alternating hot‑cold outdoor climate conditions.

This resin displays good solubility in aromatic solvents, high‑boiling hydrocarbon solvents and compatible silicone fluids. The actual compatibility with base silicone polymer is highly dependent on methyl‑phenyl ratio of the resin. Mismatched resin‑polymer polarity may induce phase separation and surface blooming in final cured articles.

During formulation processing, sufficient stirring and dissolution are necessary to achieve a homogeneous system. For solvent‑borne outdoor coating, proper evaporation control of solvent is required during film forming to avoid pinhole defects. In rubber and adhesive compounding, adequate mixing time should be reserved to prevent localized resin agglomeration.

The product requires hermetically sealed storage under cool and dry conditions. Direct long‑term sunlight exposure should be avoided. Cross‑contamination with sulfur or nitrogen‑containing impurities must be strictly prevented, especially when this resin is applied within addition‑cure silicone rubber formulas. This methyl‑phenyl MQ silicone resin is a versatile weather‑resistant modifying raw material for outdoor silicone coating, silicone rubber and silicone adhesive.

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Jishengya Technology

Shenzhen Jishengya Technology Co., Ltd. is located in Shenzhen, a special economic zone, and is a comprehensive technology enterprise integrating independent R&D, production and sales.