Our company is Yixing Wencheng Chemical Co., Ltd., a production plant of acrylate series including trimethylolpropane trimethacrylate (TMPTMA). We have been engaged in the production and sales of acrylate series and their derivatives for more than 15 years. TMPTMA molecules have three methacrylic acid double bonds. When exposed to UV light, under the action of free radicals generated by the photoinitiator, they undergo a copolymerization reaction with epoxy acrylic photosensitive resin to form a three-dimensional cross-linked paint film. At the same time, it acts as an active diluent to reduce the viscosity of the system and participates entirely in the curing and film formation, with no volatile components. TMPTMA is frequently blended with TMPTA for use in high-end photosensitive solder mask inks for PCBs, serving as a modified cross-linking monomer designed for automotive applications and high-reliability computing boards.

TMPTMA, as a high-performance trifunctional methacrylate monomer, plays multiple core roles in PCB electronic ink systems, including crosslinking reinforcement, active viscosity reduction, low-shrinkage molding, and formulation modification. Leveraging its trifunctional three-dimensional cross-linked structure, it can significantly improve the cross-linking density of solder resist coatings, effectively enhancing the coating hardness, resistance to MEK solvent wiping, and thermal shock resistance of lead-free reflow soldering. Compared to TMPTA, TMPTMA cured coatings have superior resistance to damp heat, hydrolysis, and long-term thermal aging, effectively improving coating failure problems such as powdering, cracking, and delamination under high temperature and high humidity conditions, meeting the high-reliability application requirements of automotive PCBs and other applications. Meanwhile, the product has a moderate viscosity, which can effectively reduce the overall viscosity of high-viscosity photosensitive resin systems, optimize screen printing and spraying performance and board leveling effect. As a reactive monomer, it can fully participate in curing and film formation without solvent evaporation, thus avoiding process defects such as pinholes and bubbles from the source. Its lower curing shrinkage compared to TMPTA alleviates internal stress in thick ink layers, reducing issues such as circuit edge recession, film warping, and pattern distortion, thereby improving surface precision and flatness. By compounding TMPTMA with TMPTA, the system overcomes the limitations of pure TMPTA formulations regarding hydrolysis and thermal aging resistance; this approach significantly boosts the ink system's overall reliability against heat and humidity aging without compromising film hardness or curing performance, achieving a synergistic upgrade in formulation properties.

TMPTMA has certain performance shortcomings in ink formulation applications, which need to be carefully controlled in actual mass production: its UV curing rate is significantly weaker than that of TMPTA, making it unsuitable for use alone in high-speed LED-UV production lines. When used alone, it is prone to problems such as insufficient exposure and surface stickiness. It can only be used as a modifier auxiliary monomer in combination with TMPTA. Due to its trifunctional structure, adding too high a proportion will significantly increase the brittleness of the paint film, leading to product bending cracks and reduced toughness. Furthermore, TMPTMA’s compatibility with certain polyurethane-modified photosensitive resins is inferior to that of TMPTA; compatibility testing is essential prior to mass production to prevent risks such as formulation phase separation or system instability. In PCB solder resist ink systems, the standard addition amount of this product should be strictly controlled between 2-6%, and it should not be used in excess.

High-end PCB photosensitive solder resist inks have extremely high requirements for the purity of TMPTMA raw materials. Ordinary industrial-grade products contain mono- and diester byproducts, free aldehydes, excessive moisture and trace metal ions, resulting in significant impurities, poor stability, and inability to meet the production standards of high-end electronic inks. Only high-purity electronic TMPTMA can meet the mass production needs. Key industry quality control benchmarks for high-purity TMPTMA include: product purity ≥99.2%, moisture content ≤0.03%, and color within the 15–20 APHA range. Furthermore, critical impurities such as metal ions, aldehydes, mono-esters, and di-esters must be strictly controlled, while the content of the polymerization inhibitor MEHQ requires precise regulation to ensure high batch-to-batch consistency. Various impurities can have serious adverse effects on the ink system: moisture and monoester impurities can interfere with UV free radical polymerization reactions, causing batch drift of ink photosensitivity and unstable curing; trace metal ions can easily lead to ion migration and leakage failure in the later stage of PCB finished products, reducing the insulation reliability of the product; aldehyde impurities can cause ink to change color during storage, abnormal viscosity, and premature gelation and scrapping; and excessively high acid values can corrode the PCB copper foil substrate, destroying the ink storage stability and coating performance. Therefore, the production of high-end electronic inks must use high-purity, low-impurity, and controllable electronic-grade TMPTMA to ensure stable ink formulations, controllable processes, and high reliability of end products from the raw material end. Yixing Wencheng Chemical Co., Ltd. is a premium manufacturer of TMPTMA; its electronic-grade TMPTMA is widely used across various sectors, including the electronic photosensitive ink industry.

Electronic-grade TMPTMA is a core functional monomer for high-end PCB inks to achieve product differentiation and improve end-product reliability, possessing significant commercial value and clear incremental market demand. In terms of product premium, by scientifically compounding with TMPTA, the resistance of solder resist ink to damp heat aging and hydrolysis can be specifically improved, effectively solving the performance shortcomings of ordinary inks under harsh working conditions. This helps manufacturers enter high-value-added fields such as new energy vehicle PCBs and high-reliability server carrier boards, build performance barriers, and break free from the price competition in the low-end market. In terms of quality and after-sales support, high-purity electronic-grade TMPTMA features extremely low impurity levels and excellent batch-to-batch consistency; this significantly reduces customer complaints regarding reliability issues—such as coating film cracking, delamination, and performance degradation—in high-temperature, high-humidity service environments, thereby boosting brand reputation and end-customer satisfaction. From the perspective of market demand structure, AI servers and high-frequency, high-speed rigid board scenarios focus more on curing efficiency, mainly using TMPTA as the main crosslinking monomer; while in fields such as automotive PCBs and industrial control high-reliability PCBs, which have stringent requirements for long-term resistance to damp heat and hydrolysis, the incremental demand for electronic-grade TMPTMA continues to be released. As a high-end reinforcing monomer, TMPTMA cannot be fully replaced by TMPTA. With the accelerated localization of electronic chemicals, the supply-demand gap for domestically produced electronic-grade TMPTMA with low metal ions and high purity continues to widen, making it a key raw material for upgrading high-end electronic ink formulations and iterating products.

Our company's trimethylolpropane trimethacrylate (TMPTMA) has been widely and long-term used in the production of PCB inks. Our TMPTMA products are known for their stable performance, excellent quality, and consistent supply. They are exported to many countries worldwide. With 15 years of experience in the industry, we have always adhered to quality and stable production capacity. We sincerely welcome customers from all walks of life to inquire, discuss, and cooperate with us!