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고성능 접착제 및 복합재료 기지 재료
개요
Epoxy resins are produced by the reaction of bisphenol A (BPA) with epichlorohydrin (ECH) to form diglycidyl ether of bisphenol A (DGEBA), the most widely used epoxy resin worldwide. Epoxies are valued for their exceptional adhesion to diverse substrates, chemical resistance, and mechanical properties after curing with amine or anhydride hardeners. Applications include aerospace composites, protective coatings, electronic encapsulation, wind turbine blades, and structural adhesives.
화학 공정
Bisphenol A reacts with excess epichlorohydrin (ECH:BPA ratio 2-10:1) in the presence of NaOH at 40-70 degrees C. The NaOH dehydrohalogenates the chlorohydrin intermediate to form epoxide groups, generating NaCl as byproduct. The crude resin is washed to remove salt and unreacted ECH, then molecular weight is controlled by the BPA:ECH ratio.
원자재
-
Bisphenol A (BPA, C15H16O2) — Condensation of phenol with acetone (Dihydroxy monomer)
-
Epichlorohydrin (ECH, C3H5ClO) — Allyl chloride route or glycerin-based Epicerol process (Epoxy group donor)
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Sodium hydroxide (NaOH) — Chlor-alkali process (Dehydrohalogenation agent)
최종 제품
-
DGEBA epoxy resin — Adhesives, coatings, composites, electronic encapsulation (Epoxide equivalent weight 170-3,500 g/eq depending on grade)
Environmental Impact
BPA is an endocrine disruptor, and its use in food-contact applications is increasingly restricted. Epichlorohydrin is toxic and carcinogenic. Cured epoxy resins are thermosets and difficult to recycle conventionally. Bio-based alternatives from plant oils and vanillin are under development.
안전 고려사항
- ⚠ Epichlorohydrin is a carcinogen and severe irritant
- ⚠ BPA is an endocrine disruptor -- exposure limits tightening globally
- ⚠ Amine hardeners are strong sensitizers -- occupational asthma risk
- ⚠ Exothermic curing reactions can cause thermal runaway in thick sections
최근 혁신
Bio-based epoxy from epoxidized soybean oil and vanillin-derived monomers are entering the market.
Vitrimers (dynamic covalent network epoxies) enable recyclability of thermoset epoxies through bond exchange reactions at elevated temperatures.
생산 규모
4500000
톤/년
$10 billion
시장 가치
더 보기: Materials Science & Polymers
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