Widely used as an epoxy curing agent in organic polyamines. There are four types of single polyamines, mixed polyamines, modified polyamines and eutectic mixed polyamines.
The single polyamines are mainly aliphatic amines, alicyclic amines, aromatic amines and polyamides. Aliphatic amines and polyamides are room temperature curing agents; aromatic amines require heat curing, and their cured products are far superior in heat resistance to mechanical strength and corrosion resistance than aliphatic amines. In terms of heat resistance, the best one is an aromatic amine curing agent, followed by alicyclic amine, and the worst is polyamide. Fatty amines have greater toxicity and irritation, and aromatic amines have higher curing temperatures, all of which require modification. Therefore, there have been various modified polyamines such as epoxide addition polyamines, Michael addition polyamines, and aromatic amines. Mixtures, etc.
1, amine curing agent
w (100 parts by mass resin required amine curing agent parts by mass) /% = (amine equivalent / epoxy equivalent) * 100 parts by mass resin = (amine molecular mass * 100 parts by mass resin) / (amine molecules Number of active hydrogen atoms in epoxy resin * Epoxy equivalent) = (molecular mass of amine/number of active hydrogen atoms in amine) * Epoxy value = (molecular mass of amine/number of active hydrogen atoms in amine) * (epoxy mass Percentage/epoxy molecular weight)
2. Calculation of the use of low relative molecular weight polyamide
The index of “amine value†used in the index of low relative molecular weight polyamide products is to measure the amount of amino group. According to Chen Shengrui, this cannot correctly reflect the number of active hydrogen atoms, so the amine value cannot be used as the basis for calculating the amount of polyamide. . For a typical polyamide, two can be calculated using the formula below.
w(polyamide)%=(56100/amine*f)*epoxy n-3 where: 56100---KOH(*10 mol)f------coefficient, f=(n +2)/(n+1), where n is the number of repetitions of CHCH- in the polyethylene polyamine minus 1 nn 22
3, ketimine dosage calculation
W (Ketimine)% = (curing agent equivalent / epoxy equivalent) * 100
The "equivalent" here means that the ketimine reacts completely with water when completely reacted.
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