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Introduction about Polyester Resins & Pultrusion process

Here in this post, all about polyester resin are the most widely used resin system, particularly in the marine industry. The resin is cured due to heating. The shape and size of the mould determine the cross-section and other features of the profile.

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Introduction about Polyester Resins & Pultrusion process

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  1. How Polyester Resin System Used In Pultrusion Process

  2. Fibre Reinforced Plastic profiles have a number of applications such as industrial flooring, platforms, ladders, window frames and many other structures. There are multiple steps through which fibre reinforcements are blended with a resin system to create a composite material known as FRP. Pultrusion is one such process which uses either Thermoplastic or Thermoset Resin systems. Polyester resin for pultrusionisthermoset resin. In pultrusion process, continuous fibre materials are passed through a bath containing the resin. The fibres get impregnated with the resin resulting in the addition of a lot of beneficial properties.

  3. What is Polyester Resin? • Polyester resin user in pultrusion process is unsaturated. The standard and economical polyester resin used in the composite industry to make FRP is orthopthalic polyester resin. However, isophthalic polyester resin is being widely used for making FRP for marine applications due to its high water resistance. Polyester resin is a thermoset resin which means it can be cured from both liquid and solid state under the right conditions. • Polyester resin is a solution of polyester in a monomer. The most common monomer used is Styrene. The monomer reduces the viscosity of the polyester. For example, 50% Styrene is present in polyester resin to reduce its viscosity. The monomer such as Styrene also cross links the molecular chains of the polyester, thereby enabling it to cure from liquid to solid state. Polyester resin sets by itself over a period of time, hence inhibitors are added to retard the setting process. Polyester resin can be provided in the basic form or with additions such as catalysts or accelerators. Catalyst increases the rate of curing of the resin without taking part in the chemical reaction. Accelerator also increases the rate of curing but is not effective in the absence of a catalyst.

  4. Low viscosity of the polyester resin enables addition of fillers. Many types of fillers can be added to the resin to impart superior mechanical, physical, chemical and even fire retardant properties to the FRP profile manufactured by pultrusion. Addition of fillers also make the cost of manufacturing the FRP profile more economical. Pigments can also be added to the polyester resin. • Polyester resin for pultrusion accounts for the largest share in terms of resin used in making FRP. This is because polyester has good processing properties and gives high yield of FRP profiles. Polyester resin is in liquid form when not cured which allows easy impregnation of the reinforcing fibres during the pultrusion process. This is another reason why polyester resin is widely used for pultrusion. • Polyester resin infused FRPs are known for their high structural integrity and superior fire resistance. This is the reason why such FRPs are used in commercial constructions and for making appliances.

  5. Pultrusion Process • First of all, the fibre reinforcements are selected. Fibre reinforcements can be glass fibres, metal fibres, carbon fibres, aramid fibres and many more. The fibre reinforcements are introduced in an automated system which passes them through an impregnating trough containing the resin system. Apart from polyester, many other kinds of resin such as vinyl ester resin, methacrylic resin, polyurethane resign, etc. can also be used. Additives and fillers such as strengthening agents, fire retardants, chemical retardants, pigments and others can also be added.The fibres get saturated with the resin. • The resin impregnated fibres pass to the mould where they are subjected to heat. The resin is cured due to heating. The shape and size of the mould determines the cross section and other features of profile. Temperature at which the mould is heated depends upon the properties to be imparted to the FRP. • The profile is pulled out of the mould and cut to the required length.

  6. Tel: +919033093933 Tel: +912751240365 https://www.hasonchem.com C-301, Copper Stone Apartment, Opp. Oscar City, SadhuVasvani Road, Rajkot – 360005. info@hasonchem.com

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