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Article
Publication date: 1 October 1999

SengNeon Gan and Kim‐Teck Teo

Reports the effects of composition and curing temperature on the film properties of three water reducible enamels prepared from palm stearin alkyds. The properties studied…

Abstract

Reports the effects of composition and curing temperature on the film properties of three water reducible enamels prepared from palm stearin alkyds. The properties studied were hardness, flexibility, and adhesion. While all the formulations exhibit excellent adhesion, generally increasing the melamine content and curing temperature can increase the hardness but reduce the resistance to cracking and deformation of the coating. Applies Fourier transform infra‐red spectroscopy (FTIR) to the study of the curing reactions. Finds that FTIR is able to identify the predominant cross‐linking reactions.

Details

Pigment & Resin Technology, vol. 28 no. 5
Type: Research Article
ISSN: 0369-9420

Keywords

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Article
Publication date: 3 February 2021

Abbas Ahmad Adamu, Norazilawati Muhamad Sarih and Seng Neon Gan

Poly(ethylene terephthalate) (PET) waste from soft drink bottles was incorporated into palm olein alkyd to produce new polyol for use in polyurethane resins as surface…

Abstract

Purpose

Poly(ethylene terephthalate) (PET) waste from soft drink bottles was incorporated into palm olein alkyd to produce new polyol for use in polyurethane resins as surface protection on metal surfaces.

Design/methodology/approach

Alkyd was prepared from palm olein, glycerol and phthalic anhydride. PET underwent simultaneous glycolysis and transesterification reactions with the alkyd. Varying the amount of PET has led to polyols with different viscosities. Polyurethane resins were produced by reacting the polyols with toluene diisocyanate. The resins were coated on mild steel panels and cured. Performances of the cured films were tested.

Findings

The polyurethanes (PU) resin cured to a harder film with better thermal stability. Films showed excellent adhesion properties, while higher content of PET exhibited higher pencil hardness, better water, salt, acid and alkali resistance.

Research limitations/implications

Other vegetable oils could also be used. The alkyd structure could be changed by formulation to have different functionality and the ability to incorporate higher amount of PET waste. Rate of glycolysis of PET could be increased by higher amount of ethylene glycol.

Practical implications

This method has managed to use waste PET in producing new polyol and PU resins. The cured films exhibit good mechanical and chemical properties, as well as excellent adhesion and thermal stability.

Social implications

The non-biodegradable PET has created environmental pollution problems connected to littering and illegal landfilling. It has become necessary to pay greater attention to recycling PET bottles for obtaining valuable products.

Originality/value

This approach is different from the earlier reports, where PET was recycled to recover the raw materials.

Details

Pigment & Resin Technology, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0369-9420

Keywords

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Article
Publication date: 7 September 2012

Desmond Teck Chye Ang and Seng Neon Gan

The purpose of this paper is to develop palm oil‐based alkyds as ultraviolet (UV) curable coatings and investigate the parameters that affect the coating performances.

Abstract

Purpose

The purpose of this paper is to develop palm oil‐based alkyds as ultraviolet (UV) curable coatings and investigate the parameters that affect the coating performances.

Design/methodology/approach

Alkyds were formulated from palm stearin, glycerol, phthalic anhydride and maleic acid. Keeping the total molar amount of dicarboxylic acids constant, the proportions of maleic acid and phthalic anhydride were varied in order to produce polymer chains with different content of unsaturation, which is crucial for UV curability. Characterisations were carried out by FTIR and 1HNMR. The alkyds were then mixed with methyl methacrylate (MMA) monomer as active diluents and cured by exposure to UV light. Performances of the cured coatings were tested in terms of film hardness, adhesion, water and alkali resistance, and thermal stability.

Findings

Upon introducing sufficient C=C, the alkyd in combination with MMA is able to UV‐cure within short time and produce film of satisfactory quality. There are several other factors, which influence the coating properties; these include thickness of coating, ratio of alkyd to active diluents, and duration of UV exposure.

Social implications

The product is a form of green technology that could benefit the environment as it involves very low or near zero emission of volatile organic compounds (VOC).

Originality/value

The novelty of this work lies in the formulation of new products from palm stearin, leading to new developments in the surface coating and palm oil industries.

Details

Pigment & Resin Technology, vol. 41 no. 5
Type: Research Article
ISSN: 0369-9420

Keywords

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