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Preparation of Synthetic Dyes (orange Ii (ci Acid Orange 7) and Pera Red (ci Pigment Red)in Liquid Form) Suitable for Dyeing of Jute Products/fabrics.

Md. Kamal Uddin
PSO
Chemical Processing Department,Pilot Plant and Processing Division, Bangladesh Jute Research Institute, Dhaka-1207.

Kh. Atiar Rahman
CSO
Pilot Plant and Processing Division, Bangladesh Jute Research Institute, Dhaka-1207.

Abstract/ Executive Summary:

The experiment was conducted during the year 1999-2000 at Bangladesh Jute Research Institute( BJRI) Dhaka, Chemical Processing Department to develop of indigenous and specific synthetic dyes. Two kinds of monoazo synthetic dyes such as Orange II (CI Acid Orange 7) and Para Red (CI Pigment Red I) were prepared by direct coupling between a diazonium salt and a phenol (2-naphthol) maintaining lower temperature (bellow 10⁰ C) and then applied to jute fabric by standard dyeing methods. The prepared dyes were evaluated by determination of color uniformity, penetration and fastness properties.It was observed that these two dyes attained very good washing and rubbing fastness. From the study it can be concluded that between the two prepared dyes Para red is suitable for dyeing jute products.

Keywords: Jute, Dye, Synthetic, Temperature, Development

Location: Pilot Plant and Processing Division, Bangladesh Jute Research Institute, Dhaka-1207.

Start Date: 00-00-1999

End Date: 00-00-2000

Program Area: Postharvest and Agro-processing

Commodity: Jute

Objectives:

Development of indigenous and specific chemicals/dyes/auxiliaries for jute and jute products.

Methodology:

This year only two kinds of monoazo acid and pigment dyes were prepared. Some necessary chemicals were produced for the preparation of Orange II (CI Acid Orange 7) and Pera Red (CI Pigment Red ). They were prepared by direct coupling between a diazonium salt and a phenol or amine.

Application of the prepared dyes to jute fabric: These two dyes were not prepared in solid form. So a method was developed for applying them to jute fabric in liquid form. Firstly, the bleached CBC was impregnated/padded with diazonium salt solution and then with 2-naphthol solution in low temperature (bellow 10⁰C) in both the cases. A bright orange and red color was thus produced in jute fabric (CBC). They were then rinsed and dried. Evaluation of the prepared dyes:The prepared dyes were evaluated by determination of color fastness, penetration, uniformity of the dyeing dyed with the prepared dyes.

Source of Information: Annual Technical Report 1999-2000 (PP: 88-91)

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 50,000

Total Budget (Tk.) : 50,000

Achievement/Findings:

Two kinds of monoazo acid and pigment dyes were prepared for dyeing jute products. They were Orange II (CI Acid Orange7) and Para Red (CI Pigment Red 1), Azo dyes and Pigments are the largest class of synthetic dyes. Their chromophore (nitro, nitroso,azo, carbonyl) is an aromatic system joined to the azo groups and common auxochromes are NH2, RH2, OH. The usual method of preparation of azo dyes was direct coupling between a diazonium salt and a phenol (2-naphthol) or an amine. Both Orange II and Para Red were applied to jute fabric in liquid state. It was observed that these two dyes attained very good washing and rubbing fastness figuring at 4 and Para Red achieved the outstanding light fastness properly rating at 6 where the highest international figure is 8. Uniformity and penetration of color were found very good. From the study it can be concluded that between the two prepared dyes Para red is suitable for dyeing jute products.

Knowledge Management: Report/Proceedings