Search results

1 – 10 of 882
Article
Publication date: 7 November 2016

Tingting Xu, Cuifeng Zhang and Lijun Chen

Presently, a wide range of polyurethane adhesives can be obtained using different kinds of polyols and isocyanates. However, the applied temperature of the polyurethane adhesive

Abstract

Purpose

Presently, a wide range of polyurethane adhesives can be obtained using different kinds of polyols and isocyanates. However, the applied temperature of the polyurethane adhesive is not more than 80°C. The film of polyurethane adhesive will be softened and deformed when its applied temperature is more than 100°C. Thus, the mechanical property of the polyurethane adhesive is decreased clearly, which limits its further application. The purpose of the study is to improve the heat resistance of polyols, especially polyester polyols and its resultant polyurethane adhesives.

Design/methodology/approach

The more rigid benzene ring is introduced into the polyester polyols to improve the heat resistance of its resultant polyurethane adhesive.

Findings

The more rigid benzene ring has ben introduced into the polyester polyols and the heat resistance of its resultant polyurethane adhesive is improved.

Originality/value

The polyester polyols with more rigid benzene ring have been prepared successfully by the vacuum melting method when diethylene glycol, neopentyl glycol, 1,6-hexanediol, ethanediol, isophthalic acid, terephthalic acid, sebacic acid and adipic acid are used as raw materials and tetra-isopropyl titanate is adopted as the catalyst.

Details

Pigment & Resin Technology, vol. 45 no. 6
Type: Research Article
ISSN: 0369-9420

Keywords

Article
Publication date: 1 December 2004

X. Li, Z. Gao, J. Gu, F. Zhao and X. Bai

The effects of polyol types, polyol molecular weights, NCO/OH molar ratio, solvent types, and resin solid contents of the one‐part ambient temperature curing adhesives were…

Abstract

The effects of polyol types, polyol molecular weights, NCO/OH molar ratio, solvent types, and resin solid contents of the one‐part ambient temperature curing adhesives were studied. The results showed that the one‐part ambient temperature curing polyurethane prepared had fast rate of setting and good bonding, meeting the requirements of a typical structural adhesive.

Details

Pigment & Resin Technology, vol. 33 no. 6
Type: Research Article
ISSN: 0369-9420

Keywords

Content available
79

Abstract

Details

Anti-Corrosion Methods and Materials, vol. 53 no. 1
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 1 February 1973

P.B. Edwards

A great deal has been written about the uses of adhesives in industrial and domestic applications, and much progress has been made in recent years in the technology of this…

Abstract

A great deal has been written about the uses of adhesives in industrial and domestic applications, and much progress has been made in recent years in the technology of this important and interesting segment of polymer chemistry. In this article it is not proposed to dwell on the well‐established (and equally well‐documented) adhesives, but rather to highlight newer developments, and particularly those areas in which rapid growth is anticipated or is already taking place.

Details

Pigment & Resin Technology, vol. 2 no. 2
Type: Research Article
ISSN: 0369-9420

Content available
Article
Publication date: 1 June 2003

Jon Rigelsford

136

Abstract

Details

Assembly Automation, vol. 23 no. 2
Type: Research Article
ISSN: 0144-5154

Keywords

Content available
Article
Publication date: 1 February 2004

74

Abstract

Details

Pigment & Resin Technology, vol. 33 no. 1
Type: Research Article
ISSN: 0369-9420

Keywords

Article
Publication date: 27 July 2012

Mariana D. Banea, Lucas F.M. da Silva and Raul D.S.G. Campilho

The purpose of this paper is to provide an insight into the techniques which are used and developed for adhesive bulk and joint specimens manufacturing.

Abstract

Purpose

The purpose of this paper is to provide an insight into the techniques which are used and developed for adhesive bulk and joint specimens manufacturing.

Design/methodology/approach

After a short introduction, the paper discusses various techniques for adhesive bulk and joint specimens manufacturing and highlights their advantages and limitations. A number of examples in the form of different bulk and joint specimens of different types of adhesives are used to show the methods for determining the adhesive's mechanical properties needed for design in adhesive technology. In order to predict the adhesive joint strength, the stress distribution and a suitable failure criterion are essential. If a continuum mechanics approach is used, the availability of the stress‐strain curve of the adhesive is sufficient (the bulk tensile test or the TAST test is used). For fracture mechanics‐based design, mode I and mode II toughness is needed (DCB and ENF tests are used). Finally, single lap joints (SLJs) are used to assess the adhesive's performance in a joint.

Findings

Before an adhesive can be specified for an application, screening tests should be conducted in order to compare and evaluate the various adhesion parameters. Properties of adhesives can vary greatly and an appropriate selection is essential for a proper joint design. Thus, to determine the stresses and strains in adhesive joints in a variety of configurations, it is necessary to characterize the adhesive behaviour in order to know its mechanical properties. A great variety of test geometries and specimens are used to obtain adhesive properties. However, for manufacturing of adhesive bulk specimens and joints necessary for use in these tests, properly, moulds should be designed.

Originality/value

The paper summarises the main methods of preparing adhesive bulk and joint specimens and the test methods for determining the mechanical properties needed for design in adhesive technology. Emphasis is given to the preparation of specimens of suitable quality for mechanical property determination and the moulds designed for this purpose.

Details

Assembly Automation, vol. 32 no. 3
Type: Research Article
ISSN: 0144-5154

Keywords

Content available
Article
Publication date: 1 June 2003

Jon Rigelsford

65

Abstract

Details

Assembly Automation, vol. 23 no. 2
Type: Research Article
ISSN: 0144-5154

Keywords

Article
Publication date: 25 November 2019

Virginija Daukantienė and Gerda Mikalauskaitė

The purpose of this paper is to evaluate the influence of assembly type on the hand property of the polyester-knitted materials containing different amounts of elastane fibre.

Abstract

Purpose

The purpose of this paper is to evaluate the influence of assembly type on the hand property of the polyester-knitted materials containing different amounts of elastane fibre.

Design/methodology/approach

The hand property of control textile materials specimens as well as assembled ones applying both adhesive bonding and sewing was evaluated analysing the typical pulling curves as well as the individual hand parameters, which were determined using the device KTU-Griff-Tester. The complex hand criterion Q was calculated for the complete assessment of both textiles and their assemblies’ hand by one numeral value.

Findings

It was shown that the fabric structure and assembly type have a significant influence on the knitted materials hand property. The complex hand criterion Q varied from 0.068 to 0.186, depending on the material structure, and it was decreased up to 42.6 per cent due to textile assemblies.

Practical implications

The determined research results are significant not only for clothing science but also leads to the improvement in clothing quality in fashion industry suggesting more ergonomic and original constructional decisions for clothes’ design, selection of most suitable assembly type and its place in overall garment area, which is very important for the development process of the slim fitted sportswear featuring with a very complicated construction, usually worn under intensive body movements causing rubbing effect to the skin.

Originality/value

Knitted fabrics should not only be elastic but also have perfect hand, thus making them to feel comfortable. But hand property of assembled textiles had not been investigated previously. Novelty and originality of this research was the objective and simple evaluation of the hand property for both knitted materials and their assemblies taking into account the overall skin sensorial comfort of a garment.

Details

International Journal of Clothing Science and Technology, vol. 32 no. 2
Type: Research Article
ISSN: 0955-6222

Keywords

Article
Publication date: 27 March 2007

Z.H. Gao, J.Y. Gu and X.D. Bai

To evaluate the effect of the concentrations of isocyanate group and hydroxyl group and hydroxyl group species on the rate constants of isocyanate‐propanol reaction, and to reveal…

Abstract

Purpose

To evaluate the effect of the concentrations of isocyanate group and hydroxyl group and hydroxyl group species on the rate constants of isocyanate‐propanol reaction, and to reveal the kinetics of isocyanate‐hydroxyl reaction.

Design/methodology/approach

The in situ FTIR technique was employed to measure the group concentration evolutions, by which the rate constants were determined. Besides, the FTIR was used to detect the OH absorbance shifts during reaction and the OH absorbance at different concentrations. The kinetic mechanism of isocyanate‐propanol reaction was discussed with the combination of rate constants and FTIR spectra.

Findings

A new reaction mechanism, alcohol association mechanism, was proposed that could explain many phenomena. It was revealed that the rate constant was independent of the isocyanate concentration, while the concentration and species of hydroxyl groups had apparent effects on the rate constants. It was possible to calculate the number averaged degree of association of propanol with alcohol association mechanism.

Research limitations/implications

The associated n‐propanol molecules that reacted with isocyanate to form urethane were the associated dimer and trimer predominately, while the iso‐propanol was the dimer.

Practical implications

The kinetics of isocyanate‐hydroxyl reaction and the alcohol association mechanism will be helpful to understand the preparation and curing of polyurethane, and their controls.

Originality/value

A new reaction mechanism, alcohol association mechanism, was proposed that could explain many phenomena that might not be interpreted by other mechanisms. The mechanism could be employed to calculate the number averaged degree of association of alcohols.

Details

Pigment & Resin Technology, vol. 36 no. 2
Type: Research Article
ISSN: 0369-9420

Keywords

1 – 10 of 882