Mercaptans are the most important species of epoxy resin curing agents and are mainly used in the adhesive field. Mercaptans have been used as a commercial epoxy curing agent for over 40 years. Compared to the countless other types of curing agents on the market, mercaptans have some unique properties. One of the most significant features is its ability to achieve rapid curing at room temperature, typically with epoxy curing speeds of around 5 minutes, particularly in thin layers, which is also one of its key properties of excellence.
INNO SPECIALTY CHEMICALS is the main Polymercaptan curing agents manufacturer and supplier in China. The main item number of its products is Polymercaptan curing agent GH300 and GH310
Epoxy resin is a general reference to organic polymer compounds containing at least two epoxy groups in the molecule, in addition to individual, their relative molecular mass are not high. Epoxy resin adhesive has good physical and chemical properties, it has excellent bonding strength to the surface of metal and non-metallic materials, good dielectric properties, small shrinkage rate, good dimensional stability of products, high hardness, good flexibility, excellent processability, stable to alkali and most solvents, and therefore widely used in national defense, national economy in various sectors, for casting, impregnation, laminating material, adhesive, coating, etc. The use of epoxy resin is widely used in national defence and various sectors of national economy, as casting, impregnation, laminating material, adhesive and coating. But the epoxy resin to achieve the above performance requirements must be mixed with a certain amount of curing agent curing, curing agent can be used to improve the inherent rigidity of the epoxy resin flexibility.
Epoxy resin curing agent variety, including room temperature and heating curing agent 2 categories, commonly used curing agent are mainly amine, anhydride, imidazole, etc., can meet the requirements of most occasions. However, in the field of low-temperature curing, only thiol is more applicable, it has a great advantage in fast repair adhesive and winter work, other assimilating agents can not be replaced.
Polymercaptan curing agent is a new type of epoxy curing agent, compared with other epoxy curing agents, its characteristics are low curing temperature, rapid curing, thin layer curing and light colour. The end of the curing agent is thiol group (-SH), when used alone the activity is very poor, at room temperature the reaction is extremely slow, almost can not be carried out, but in the presence of appropriate promoter can form thiol ion, curing reaction to several times the speed of polyamine, this feature in the low temperature curing more can show. When tertiary amines are present, the thiol group first reacts with the tertiary amine to form a thiol ion, which then reacts with the epoxy group to cure the epoxy. Traditional epoxy curing agent, such as low molecular weight polyamide, at room temperature need 24h to make epoxy fully cured, and with Polymercaptan system only 5min. so Polymercaptan in fast repair adhesive and winter work occasions have great advantages, other curing agent can not be replaced. Thiol curing agent because of the presence of sulfur-containing flexible chain segments and high refractive index, in the toughening resin and transparent resin also has great application value.
Polymercaptans have low toxicity compared to other curing agents, a light colour, excellent adhesion and the ability to act as accelerators to speed up the reaction of other amine curing agents. The low odour and tastelessness of polymercaptans are also its most outstanding features. However, due to the high technical requirements for the production of thiol curing agent, there is very little domestic production, generally imported products, such as the United States GABEPRO GPM-888,GABEPRO GPM-800,Capcure3-800, Capcure3830-81, Capcure LOF,Capcure 40 sec HV, CapcureWR- 6 and other grades and Japan’s EpomateQX-10, EpomateQX-11. EpomateQX-11, EpomateQX-40, MP-2290, EH-316, etc. are more commonly used.
The unique characteristic of Polymercaptan-cured epoxy resins is their ability to cure quickly at ambient and low temperatures even in thin layers. Polysulfide offers fast curing speeds (less than five minutes) and excellent bond strength to materials such as glass and concrete. Its hardness development properties also make it an ideal curing agent for the DIY consumer, automotive, construction and concrete markets, as well as a variety of other industrial products, including
Industrial adhesives: solar panels, insulating glass, bonding metals, glass and plastics, jewellery, emergency repairs
Consumer/DIY: Adhesives General maintenance, crafts
Construction: concrete patching and crack filling, ground bolts, grouting, filling material
Floor coatings: primers, topcoats, quick floor repairs
Packaging: microscope samples, microelectronic components, electrical components
Automotive Afterword: Adhesives and Sealants
Electrical/Electronic: potting, connection of components to circuit boards
Electronic dispensing, epoxy one-component adhesives, epoxy two-component adhesives, fast-drying coatings
Accelerators for other curing systems
Polymercaptan epoxy resin formulations are usually a mixture of polymers and additives and require detailed product specifications to meet the customer’s requirements depending on the end customer’s process. We can offer alternatives to GPM-800 and GPM-888 with the following properties.
Polymercaptan curing agent GH300
GH300 is a thiol capped polymer, a low toxicity compound with excellent colour and is an effective liquid curing agent for epoxy resins.GH300 has unique fast curing properties for epoxies at ambient temperatures, giving fast curing systems at low temperatures and in films, and can also be used to accelerate other epoxy curing agents such as amines, polyamides and acylaminoamines. Very fast curing at low temperatures and low film thicknesses, further enhanced by use with amine curing agents. Can replace GPM800/ Capcure3800/ QE340-M.
GH300 can also be used as an epoxy resin curing agent/accelerator for fast drying coatings, adhesives, cast plastics, etc. It is particularly suitable for use in fast repair adhesives and in low temperature curing areas in winter work situations.
Product Benefits.
- Fast curing at room temperature with a wide choice of curing speeds.
- better transparency, low colouration.
- Good heat resistance, water resistance and solvent resistance.
Areas of application.
- Industrial Fast Adhesives
- Structural adhesives for construction
- Epoxy potting, laminating, cast moulding
- Protective coating
- Reinforced plastics
- Electrical insulation
- Workwear
- Road marking adhesives
- Consumer Patch Pack
- Curing accelerator for epoxy adhesives, epoxy curing accelerator
- Jewellery and craft adhesive curing
Polymercaptan curing agent GH310
GH310 is a modified Polymercaptan curing agent and amine-catalyzed epoxy curing material that cures rapidly at room temperature. It can be used as a single curing agent or as an accelerator for amine or amide curing agents. In addition to its low toxicity, GH310 has excellent low temperature curing ability and an accelerated cure time of three to five minutes. It can be used as a replacement for GPM888.
Modified Polymercaptan curing agent series with epoxy resin ratio, in low temperature and thin coating film, can achieve rapid gel curing, in fast repair, winter and low temperature work occasions than other curing agents have obvious advantages.
As an important epoxy fast curing agent in the field of fast bonding, laminating and casting, it is widely used in craft accessories, electronics and electrical appliances, civil engineering and construction, composite materials, photovoltaic new energy and other industries.
Product Benefits.
- Excellent low temperature curing ability.
- a curing time of 3-5 minutes.
- Low toxicity.
Areas of application.
- Civilian adhesives
- Emergency repair adhesives such as car refinishers
- Model and craft adhesives and coatings
- Industrial adhesives
- Civil Engineering
- Jewellery and craft adhesive curing
- Protective coating
- Electronic and electrical adhesives
- Concrete slurries and patches
- Coatings
- Accelerated curing of epoxy adhesives
