- Synthesis and properties of phosphorus-containing bio-based epoxy resin from itaconic acid
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A phosphorus-containing bio-based epoxy resin (EADI) was synthesized from itaconic acid (IA) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO). As a matrix, its cured epoxy network with methyl hexahydrophthalic anhydride (MHHPA) as the curing agent showed comparable glass-transition temperature and mechanical properties to diglycidyl ether in a bisphenol A (DGEBA) system as well as good flame retardancy with UL94 V-0 grade during a vertical burning test. As a reactive flame retardant, its flame-resistant effect on DGEBA/MHHPA system as well as its influence on the curing behavior and the thermal and mechanical properties of the modified epoxy resin were investigated. Results showed that after the introduction of EADI, not only were the flame retardancy determined by vertical burning test, LOI measurement, and thermogravimetric analysis significantly improved, but also the curing reactivity, glass transition temperature (T g), initial degradation temperature for 5% weight loss (T d(5%)), and flexural modulus of the cured system improved as well. EADI has great potential to be used as a green flame retardant in epoxy resin systems.
- Ma, Songqi,Liu, Xiaoqing,Jiang, Yanhua,Fan, Libo,Feng, Jianxiang,Zhu, Jin
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- Synthetic method of flame retardant DOPO-ITA
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The invention relates to a synthetic method of a flame retardant DOPO-ITA. The synthetic method comprises the steps that raw material DOPO and itaconic acid with an equimolar ratio are added to an ether solvent under the condition of inert gas nitrogen or argon atmosphere protection, heated to 150-180 DEG C in a pressurizing heating mode, stirred and reacted for 4-8 hours and subjected to coolingand crystallization to obtain the flame retardant DOPO-ITA, and the reaction conversion rate can be up to 98% and above. The synthetic method has the following characteristics of high reaction conversion rate, high product purity, small environmental pollution, low pressure reaction, simple and practicable production control, and being suitable for large-scale production.
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Paragraph 0010; 0024-0039
(2019/03/24)
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- A phosphorus-containing bio-based acid diene diethyl and its preparation method and application
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The invention discloses a diallyl phosphorus-containing bio-based diacid ester and its preparation method and use. The diallyl phosphorus-containing bio-based diacid ester has a structure shown in the formula I, and in the formula I, n is equal to 0 or 1. The diallyl phosphorus-containing bio-based diacid ester can be used as a fire retardant and can be used for preparation of a nonsaturated polyester. The invention also discloses a preparation method of the diallyl phosphorus-containing bio-based diacid ester. The preparation method utilizes itaconic acid, fumaric acid or maleic acid having abundant biological sources as a raw material to realize modification of DOPO. The preparation method has dual effects of saving resources and protecting environment. The invention also discloses a use of a diglycidyl phosphorus-containing bio-based diacid ester. Based on a diglycidyl phosphorus-containing bio-based diacid ester, through introduction of an epoxy group, the diglycidyl phosphorus-containing bio-based diacid ester is obtained and has a structure shown in the formula III, and in the formula III, n is equal to 0 or 1. The diglycidyl phosphorus-containing bio-based diacid ester can be used as a fire retardant and can be used for preparation of epoxy resin.
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Paragraph 0045-0047
(2017/02/24)
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