Unsaturated resin curing agent is a kind of chemical raw material, mainly used to thicken and solidify the surface of objects, which is similar to the effect of paint. There are many types of unsaturated resin curing agents, which can be used in a wide range, and the price is relatively cost-effective, but there are many things that need to be paid attention to during the use. What should I pay attention to?
Precautions for the use of unsaturated resin curing agent
Precautions for the use of unsaturated resin curing agent 1. The curing agent and accelerator must be used together, that is, No. 1 accelerator for No. 1 curing agent and No. 2 accelerator for No. 2 curing agent.
Precautions for the use of unsaturated resin curing agent 2. The curing agent is a strong oxidant. It must be placed in a dark place where it is not exposed to light. For the sake of safety, the curing agent is generally used as a paste with the plasticizer, and the accelerator can be used as a diluent with styrene.
Precautions for the use of unsaturated resin curing agent 3. The curing agent and accelerator should never be directly mixed to avoid explosion. It should also be placed separately during storage. Do not add curing agent and accelerator at the same time when mixing glue. You can mix accelerator with resin first, then add curing agent to mix.
Precautions for the use of unsaturated resin curing agent 4. The dosage of curing agent and accelerator should be adjusted according to the needs (such as product performance, operating temperature and length of service life, etc.). No accelerator may be added in the heat curing formulation. When curing at room temperature, it can be adjusted according to the gel time. When the amount of curing agent is determined, the amount of accelerator can be adjusted. Generally, the amount of curing agent is 2 to 4% of the weight of the resin, and the amount of accelerator is 1 to 2 %.
Unsaturated resin curing agent classification
According to the different ways of initiation, there are three types of unsaturated polyester resin curing:
Thermal curing: external curing causes the curing agent to release free radicals, thereby initiating the curing process of the resin. (Also called thermally initiated curing) Cold curing: The process of curing a resin by adding accelerators to release the free radicals of the curing agent at room temperature or when the curing temperature is not high. (Also called chemical decomposition initiated curing)
Light curing: by adding a photosensitizer and using ultraviolet as an energy source, the process of resin crosslinking and curing is initiated. (Also known as photo-initiated curing)
Types of curing agents commonly used in cold curing systems. 1. Cyclohexanone peroxide (a mixture of multiple hydroperoxides) Cyclohexanone peroxide is dissolved in dibutyl ester and becomes a 50% paste, called 1 # curing agent.
2. Dibenzoyl peroxide (is a peroxide, referred to as BPO) Dibenzoyl peroxide is dissolved in dibutyl ester to become a 50% paste, called 2 # curing agent.
3. Methyl ethyl ketone peroxide (MEKP for short) 1% ~ 2% of the weight of the curing agent resin. It is generally necessary to use the accelerator together with the accelerator. The curing agent is also called an initiator. The energy required to open the o = o key is relatively low, generally 50-120 degrees Will open.
Through our introduction to the precautions and classification of unsaturated resin curing agents, you should have a more comprehensive understanding of unsaturated resin curing agents. Although this material is relatively cheap, it will release some toxic gases, so everyone should use it with caution.