Methyl MQ silicone resin, with its unique three-dimensional mesh structure and excellent physical and chemical properties, has shown significant application advantages in the field of polyurethane release.Its core mechanism of action lies in the construction of a release interface layer with both flexibility and strength through the dual effects of chemical bonding and physical film formation.


Release performance optimization mechanism
The copolymer structure of the M unit (monofunctional methylsiloxane) and the Q unit (tetrafunctional siloxane) of methyl MQ silicone resin gives it an adjustable crosslinking density.In a polyurethane mold release agent, the resin forms a hydrogen bond or chemical bond with the mold surface through hydroxyl groups, while the methyl groups are arranged outward to form a low surface energy layer.This structure enables the mold release agent to form a dense and flexible film on the surface of the mold, which can not only withstand the shrinkage stress generated by the polyurethane reaction, but also avoid the rupture of the film due to brittleness.Experimental data show that adding a mold release agent of 5%-15% methyl MQ silicone resin can increase the number of mold releases to 8-12 times, which is more than 3 times higher than the traditional silicone oil system.


Breakthrough in process adaptability
In view of the characteristics of high mold temperature and fast reaction speed in the polyurethane foaming process, methyl MQ silicone resin has achieved performance breakthroughs through molecular design. In the application of mold release agent, this characteristic is transformed into a wide range of adaptability to mold temperature, which can maintain stable mold release performance in the range of -30℃ to 250℃.For complex structural products, such as car seat foam, its excellent leveling properties can ensure uniform coverage of the corners of the mold cavity and avoid tearing of the product due to insufficient local release force.


Composite system efficiency enhancement
The combination of methyl MQ silicone resin and polydimethylsiloxane (PDMS) can significantly improve the overall performance of the mold release agent. During the high-temperature curing process, the hydroxyl group of the MQ resin condenses with the PDMS to form a three-dimensional reinforcement network, which increases the tensile strength of the release film to 12Mpa and the elongation at break to 350%.This enhancement effect enables the mold release agent to maintain the integrity of the film when it is subjected to the 2-5MPa mold release force generated by the polyurethane reaction.


Industry application verification
In the production of polyurethane soles, the mold cleaning cycle of methyl MQ silicone resin release agent is extended from 1 time a day to 2 times a week, and the surface gloss of the product is increased by 20%.For high-adhesion resin systems such as epoxy polyurethane, the resin optimizes the release force by adjusting the M/Q ratio (0.6-1.0), so that the release agent maintains a 100% release success rate without affecting the subsequent coating adhesion of the product.In the production of automotive interior parts, its low volatile content characteristics (<0.35%) reduce VOC emissions to below 80µg/m3, which meets the stringent environmental protection requirements of the automotive industry.