蓖麻油基水性环氧固化剂的合成及性能

doi:10.3969/j.issn.0253-2417.2019.03.009

Abstract

Abstract:

The adducts MDI-RA were firstly synthesized from liquified diphenylmethane diisocyanate(MDI) and ricinoleic acid(RA). Then esterification reaction between ethylene diglycidyl ether and MDI-RA was carried out for the preparation of the castor oil based epoxy active intermediates(RAE). Finally, the chain reaction of RAE with diethylenetriamine(DETA) and glycidol was performed to obtained the waterborne epoxy curing agents based on castor oil. By this way, two kinds of target products(RAWCA-1 and RAWCA-2)were obtained from feeding ratio of the n(MDI):n(RA) of 1:3 and 1:4, respectively. The chemical structures of the intermediates and the target products were confirmed by Fourier transform infrared spectroscopy(FT-IR), proton nuclear magnetic resonance(¹H NMR) and gel permeation chromatography(GPC). The results showed that the structure parameters of target products were basically agreed with the designed molecular structure and the M_n and M_w of target products were 1 832 g/mol and 1 983 g/mol. The property study showed that the target products could emulsify liquid epoxy resin E-51. The properties of the two-component film obtained from the curing reaction of RAWCA-1 and liquid epoxy resin E-51 were as follows:flexibility 1 mm, pencil hardness 3H, impact resistance 50 kg/cm, good water resistance, which could meet a requirement with commercial waterborne epoxy curing agent products.

Key words: castor oil acid, liquified MDI, waterborne epoxy curing agent, synthesis, performance

CLC Number:

TQ35

Xiaohua YANG,Jinhua ZHU,Yan ZHANG,Shouhai LI,Mei LI. Preparation and Properties of Waterborne Epoxy Curing Agents Based on Castor Oil[J]. Chemistry and Industry of Forest Products, 2019, 39(3): 65-71.

Figures/Tables 5

Table 1

Fig.1

Fig.2

Table 2

Table 3

References 17

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g
样品 sample	RAE-DETA-1	RAE-DETA-2	RAWCA-1	RAWCA-2	E-51	混合型助剂 mixed additives
RAE-DETA-1/E-51	100	0	0	0	96.00	9.22
RAE-DETA-2/E-51	0	100	0	0	95.00	9.12
RAWCA-1/E-51	0	0	100	0	50.00	4.80
RAWCA-2/E-51	0	0	0	100	50.00	4.80

样品 sample	温度/时间 temp. /time	外观 appearance	柔韧性/mm flexibility	铅笔硬度 pencil hardness	抗冲击强度/(kg·cm^-1) impact strength	耐水性(24 h) water resistance
RAE-DETA-1/E-51	25 ℃/4 h+60 ℃/ 4 h+80 ℃/2 h	无色透明 colorless and transparent	1	H	≥50	不发白 non-whitish
	60 ℃/8 h	无色透明 colorless and transparent	1	3H	48	不发白 non-whitish
	100 ℃/6 h	黄色yellow	1	3H	48	不发白 non-whitish
RAWCA-1/E-51	25 ℃/4 h+60 ℃/ 4 h+80 ℃/2 h	无色透明 colorless and transparent	1	3H	≥50	不发白 non-whitish
	60 ℃/8 h	无色透明 colorless and transparent	3	3H	45	不发白 non-whitish
	100 ℃/6 h	黄色yellow	＞7	3H	45	不发白 non-whitish

样品sample¹⁾	外观 appearance	柔韧性/mm flexibility	铅笔硬度 pencil hardness	抗冲击强度/ (kg·cm^-1) impact strength	耐水性(24 h) water resistance	耐水性(48 h) water resistance
RAE-DETA-1/E-51	透明transparent	1	H	50	不发白non-whitish	不发白non-whitish
RAE-DETA-2/E-51	透明transparent	1	H	50	不发白non-whitish	白色斑点white spots
RAWCA-1/E-51	透明transparent	1	3H	50	不发白non-whitish	不发白non-whitish
RAWCA-2/E-51	透明transparent	1	2H	50	发白whitish	发白whitish
Anquamine721/E-51^[16]	透明transparent	1	3H	50	不起泡，不失光 no bubbling, no clouding	不起泡，不失光 no bubbling, no clouding
Anquamine721/AR555^[17]	—	2	2H	40	—	—

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Preparation and Properties of Waterborne Epoxy Curing Agents Based on Castor Oil

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