Cathodic electro-deposition of low-temperature curable water-soluble polyepoxide coatings

Kumar, Praveen; Trivedi, M.K.

doi:10.1016/s0300-9440(00)00152-1

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…These tertiary amino groups would, in fact, Table II Formulations used for the preparation of CNs S. no. Resin designation Molar ratio (cardanol:formaldehyde) Amount of cardanol (g) Amount of formaldehyde (g) Amount of succinic acid (g) (Tanaka and Bauer, 1988;Kumar and Trivedi, 2000) as shown in Scheme 4.…”

Section: Self-curability Of Applied Films Of Mecnsmentioning

confidence: 99%

“…Cardanol has been an attraction for several researchers for the synthesis of phenolic resins, either as novolacs or as resoles (Jayabalan and Rajadurai, 1985;Vu et al, 1998;Menon et al, 1985;Liu, 2006;Chuayjuljit et al, 2007;Ke Jinlian, 2008;Yadav et al, 2009;Pan, 2009). The coatings prepared from epoxy resins based either on phenol novolac or diglycidyl ether of bisphenol-A (DGEBA) derived from phenol and bisphenol-A (Kumar and Trivedi, 2000;Gangotri and Dhaneshwar, 2007), are rigid with limited deformability, and may fail due to cracking.…”

Section: Introductionmentioning

confidence: 99%

“…Also, for the preparation of CNs, in the present investigation, no any organic solvent was used as a medium. The work has emphasized to eliminate crosslinkers from the coating compositions by following a self-curing mechanism, which is one-molecule chemistry based on anionic polymerization (Tanaka and Bauer, 1988;Paul, 1996;Kumar and Trivedi, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Self‐curable epoxide resins based on cardanol for use in surface coatings

Shukla

Kumar

2011

Pigment &Amp; Resin Technology

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Purpose -The purpose of this paper is to develop eco-friendly coatings based on low-cost epoxide resins prepared by using a natural phenolic material such as cardanol (non-toxic), in place of ordinary phenol (toxic), which can be self-curable at an optimum temperature. Design/methodology/approach -Cardanol-formaldehyde novolac resins (CNs) were prepared by reacting cardanol with formaldehyde in different molar ratios varying from 1:0.6 to 1:0.9. Prepared CNs were epoxidised by reacting with epichlorohydrin to produce epoxide resins, which would be called as epoxidised CNs (ECNs). Further, ECNs were modified by reacting with diethanolamine (DEtOA), a secondary amine to introduce tertiary amino group(s) into the molecules, required for self-curability of ECNs. These modified ECNs are referred to as MECNs. The molar ratio of ECNs to DEtOA was taken in accordance with epoxy functionality of epoxide resins (ECNs) which ranged from 0.5 to 2.9. Nine numbers of MECNs (MECN 1 to MECN 9 ) were prepared by using four epoxide resins. These resins viz. CNs, ECNs and MECNs were characterized by 1 H NMR and FTIR spectroscopic methods for their structure elucidatation, and by gel permeation chromatography for determining their molecular weights. Findings -The most suitable molar ratio of ECN:DEtOA for the preparation of MECNs was found to be 1:1. The CN prepared by using cardanol and formaldehyde in the molar ratio of 1:0.7 was used for the preparation of ECN 2 and MECN 2 . Applied films of epoxide resins, designated as MECN 2 , had reasonably good physical and chemical resistance properties. With a wide cure window, the films of MECN 2 were found to be self-curable at an optimum cure schedule of 1608C/30 min. Owing to self-curability of the developed epoxide resins, the coatings based on them did not require any additional/external crosslinker to be incorporated in the coating composition.Research limitations/implications -The prepared epoxide resins (MECNs) had good physical and chemical resistance properties, but demonstrated low stability and low resistance to xylene, in particular. Originality/value -The paper shows how the epoxide resins were prepared by using a low-cost phenolic material (cardanol) which is obtained from natural renewable resources, instead of petroleum, and is non-toxic. These developed coatings can be applied as primer coat and top coat on metallic substrates. True self-curability of the coating films has been achieved via anionic polymerization.

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Section: Self-curability Of Applied Films Of Mecnsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Self‐curable epoxide resins based on cardanol for use in surface coatings

Shukla

Kumar

2011

Pigment &Amp; Resin Technology

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“…Cathodic electrophoretic coating basic resin which were synthesized by grafting acrylic polymer onto epoxy resin, have advantages of the above two. Its resin-based material is widely used in the automotive, building materials, metals, household appliances and other coating fields [2,3]. Cathodic electrodeposition coating developed in the 1970s.…”

Section: Introductionmentioning

confidence: 99%

Study of Epoxy Acrylic Cathodic Electrodeposition Coatings and Investigation on the Electrophoretic Coating Process

Chen

2014

AMM

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As an environment-protecting waterborne coating, the cathodic electrodeposite coating has wide applications prospects.The self-crosslinked acrylate grafted epoxy resins for cathodal electrophoretic coating were synthesized by grafting acrylic polymer onto epoxy resin . This epoxy-acrylic copolymer both have high modulus, high-strength ,excellent chemical resistance and corrosion resistance of epoxy resin, and both have the light-acrylic resin fullness, good weather resistance and other characteristics of acrylic resin,which are widely used in the automotive, building materials, home appliances and other fields.The electrophoretic coating is an extremely complex process. The effects of the parameters of electrophoretic technology on the properties of paint films were studied systemically.The results show that the electrophoretic paint with better appearance and propeties can be made when voltage was about 90V,the solid share was 16%,pH was 5.8and electrophoresis time was 2-3min.

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“…Cathodic electrophoretic paint presents better corrosion resistance, higher throwing power, and overcomes such drawbacks of anodic electrophoretic paint as substrate dissolution and film discoloration. [7][8][9] Numerous efforts have been made in exploiting new-type resins to improve the thickness, anti-corrosion, weather resistance, and decoration of the film. Zhou et al [10] prepared aminating epoxy acrylate cationic resin with good electrodeposition performance and appearance.…”

Section: Introductionmentioning

confidence: 99%

An improvement of color electrophoretic paint via ultrafine modified pigment paste

Mao

Wang

et al. 2013

Journal of Adhesion Science and Technology

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The ultrafine paste used in electrophoretic paint was prepared via ultrasonic method with pigment yellow 83 (P.Y.83), octadecyl dimethyl benzyl ammonium chloride, and deionized water. The average particle size of the ultrafine paste was only 196 nm and zeta potential was 30 mV with ultrasound for 30 min and 2 wt.% cationic dispersant. The conductivity of the paint was improved as the cationic dispersant increased. Centrifugal stability of the paint with ultrafine paste reached the maximum at 2 wt.% cationic dispersant. Compared with the performances of cathodic electrophoretic paint with the ultrafine yellow paste, the anodic film was smooth, uniform, and neat with 0.5 wt.% cationic dispersant in the ultrafine yellow paste. Deposited amount of the anodic film was 27 g/m 2 , which was higher than the cathodic film. The curing property, adhesion, and chemical resistance of the cathodic film were better than the anodic film. Properties of five color cathodic paints (blue, yellow, red, black, and green) were discussed and were compared with the film of electrophoretic paint containing commercial pastes. Except the green film, the blue, yellow, red, and black films were smooth, fine, and uniform, and also provided good L-effect. The deposited amount of these films with excellent adhesive force was about 14-19 g/m 2 . The electrophoretic paints containing modified pigment pastes and commercial pigment pastes present good adhesion and chemical resistance.

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Cathodic electro-deposition of low-temperature curable water-soluble polyepoxide coatings

Cited by 4 publications

References 3 publications

Self‐curable epoxide resins based on cardanol for use in surface coatings

Self‐curable epoxide resins based on cardanol for use in surface coatings

Study of Epoxy Acrylic Cathodic Electrodeposition Coatings and Investigation on the Electrophoretic Coating Process

An improvement of color electrophoretic paint via ultrafine modified pigment paste

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