mixing organic peroxides into unsaturated polyester resin

Mixing Organic Peroxides into Unsaturated Polyester Resin ...

Jan 01, 2015  The mixing of organic peroxides (OPs) into unsaturated polyester resin (UPR) can make a critical difference between a good part and an increasing scrap rate. The key is in the order of mixing and reducing the possibility of reacting the OP before it gets into the UPR. As a rule of thumb, it’s best to add the OP last and mix

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CURING OF UNSATURATED POLYESTER RESINS

Danger of explosion: never mix peroxides and accelerators together; add each component separately to the resin. Store peroxides in original containers. Contact with rust, ash, dirt, accelerators and many other chemicals can cause violent decompositions. Even in diluted form peroxides have a corrosive effect on the skin and eyes.

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C omposites Manufacturing January/February 2015

Mixing Organic Peroxides into Composite Materials Best Practices T he mixing of organic peroxides (OPs) into unsaturated polyester resin (UPR) can make a critical difference between a good part and an increasing scrap rate. The key is in the order of mixing and reducing the possibility of reacting the OP before it gets into the UPR.

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Reaction of carbonylhydrazines and organic peroxides to ...

The foaming and curing of unsaturated polyester resins are well known in the prior art. U.S. Pat. No. 3,920,589 discloses foaming and curing of an unsaturated polyester resin using a peroxide curing agent, a transition metal salt promoter, hydrazine or a sulfonyl hydrazide blowing agent, and a halogen redox compound.

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Curing studies of unsaturated polyester resin used in FRP ...

marine, structural and household components. Unsaturated polyester (UP) resin is a principle binder material used in FRP products. Curing of UP resin is a key for successful FRP processing. ... generally the organic peroxides (like methyl ethyl ketone peroxide (MEKP)) are mostly used as catalysts ... insight into curing of the resin. In this ...

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4.4 Polyester Resin Plastic Products Fabrication

Common catalysts are organic peroxides, typically methyl ethyl ketone ... Figure 4.4-1. Typical reactions for unsaturated polyester and polyester resin formation. ... Chopped glass fibers free-fall into the resin mix and are allowed to saturate with resin, or "wet out". A second carrier film is applied on top of the panel before subsequent ...

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C omposites Manufacturing January/February 2015

Mixing Organic Peroxides into Composite Materials Best Practices T he mixing of organic peroxides (OPs) into unsaturated polyester resin (UPR) can make a critical difference between a good part and an increasing scrap rate. The key is in the order of mixing and reducing the possibility of reacting the OP before it gets into the UPR.

get price

Curing studies of unsaturated polyester resin used in FRP ...

marine, structural and household components. Unsaturated polyester (UP) resin is a principle binder material used in FRP products. Curing of UP resin is a key for successful FRP processing. ... generally the organic peroxides (like methyl ethyl ketone peroxide (MEKP)) are mostly used as catalysts ... insight into curing of the resin. In this ...

get price

Reaction of carbonylhydrazines and organic peroxides to ...

The foaming and curing of unsaturated polyester resins are well known in the prior art. U.S. Pat. No. 3,920,589 discloses foaming and curing of an unsaturated polyester resin using a peroxide curing agent, a transition metal salt promoter, hydrazine or a sulfonyl hydrazide blowing agent, and a halogen redox compound.

get price

How to Safely Handle and Store Organic Peroxides - HM Royal

Feb 17, 2021  These chemicals are often used in the same processes as organic peroxides to promote the cure of unsaturated polyester resins. Special care must be taken to ensure that accelerators never come into direct contact with organic peroxides. In the event of chemical contamination, the same hazards exist as with thermally induced decomposition.

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Unsaturated Polyester Resin-Rooflight Translucent UV ...

Never add metal salts (Accelerator) or Pre Accelerated resin to Peroxides when adding peroxides to a resin solution, mix thoroughly the resulting product Do not add organic peroxides to a hot diluents or process. Prevent contamination of Accelerator, promoter from materials like (Iron Copper, Cobalt) salts, storing acids and sanding dusts.

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cellEQ Polyester resin

In UP resin systems, organic peroxides are often used for this purpose. The resulting radicals trigger the chain reaction (radical polymerization) to crosslink the polyester/vinyl mixture. As the cross-linking reaction of polyester resins is based on a chain reaction, the mixing ratio of resin

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Catalyst Chart - Fiberglass Supply

Catalyst Chart Volume of Catalyst to Be Used with Polyester Resins Methyl Ethyl Ketone Peroxide-Percent by Weight 1% 1.25% 1.5% 1.75% Resin(1) Volume Drop cc oz Drop cc oz Drop cc oz Drop cc oz 4 ounce 32 1-1/4 1/32 40 1-1/2 3/64 48 1-3/4 1/16 56 2 1/16+

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Flammability and Thermal Stability of Unsaturated ...

Jan 01, 2019  17.1. Introduction. Unsaturated polyester (UP) as a curable thermoset resin was first developed by Carleton Ellis in 1933 by heat treatment with a mixture of polyhydric alcohol and mono/polybasic acid or its anhydride .Later in 1936, it was realized that by using a peroxide catalyst, the cure temperature could be reduced and that by combining the UP with such reactive monomers as

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Effect of dual-initiator on low temperature curing of ...

Sep 03, 2004  An unsaturated polyester resin, Aropol Q6585, provided by Ashland Chemical was used in this study, which contains 35% styrene and 65% unsaturated polyester prepolymer by weight. The prepolymer is a step-growth product of 1:1 maleic anhydride and propylene glycol, with about 10.13 internal vinylene groups per molecule and an average molecular ...

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Tech Talk - Composites Manufacturing Magazine

The mixing of organic peroxides (OPs) into unsaturated polyester resin (UPR) can make a critical difference between a good part and an increasing scrap rate. The key is in the order of mixing

get price

Unsaturated polyester resin foams and methods of ...

Unsaturated polyester resin foams or cellular structures of varying low densities are prepared quickly at ambient temperatures from an admixture which comprises a liquid unsaturated curable polyester resin, an organic isocyanate compound, a suitable surfactant, an accelerator and a particular combination of peroxide curing agents, which also serves to initiate the release of gases that permit ...

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Kinetic Analysis of Two DSC Peaks in the Curing of an ...

The curing of an UP resin is a free radical polymeriza-tion in which the resin is transformed from the liquid state into a rigid crosslinked molecular structure, which becomes insoluble and infusible. To initiate the reaction a source of free radicals is needed, by means of heat or a catalytic system. Organic peroxides (initiators) are com-

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Difference Between Polyester, Acrylic, and Epoxy Resins ...

A: Acrylic resin (but not acrylic emulsion, which is the basis of acrylic paint) is a thermoplastic, which means it is one of a group of plastics which can be heated and manipulated repeatedly, whereas polyester resin and epoxy are thermosetting plastics, which use heat or a catalyst to solidify into a solid mass that won’t melt down. Acrylic is mixed from acrylic polymer, a dry powder, a ...

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4.4 Polyester Resin Plastic Products Fabrication

Common catalysts are organic peroxides, typically methyl ethyl ketone ... Figure 4.4-1. Typical reactions for unsaturated polyester and polyester resin formation. ... Chopped glass fibers free-fall into the resin mix and are allowed to saturate with resin, or "wet out". A second carrier film is applied on top of the panel before subsequent ...

get price

Curing studies of unsaturated polyester resin used in FRP ...

marine, structural and household components. Unsaturated polyester (UP) resin is a principle binder material used in FRP products. Curing of UP resin is a key for successful FRP processing. ... generally the organic peroxides (like methyl ethyl ketone peroxide (MEKP)) are mostly used as catalysts ... insight into curing of the resin. In this ...

get price

How to Safely Handle and Store Organic Peroxides - HM Royal

Feb 17, 2021  These chemicals are often used in the same processes as organic peroxides to promote the cure of unsaturated polyester resins. Special care must be taken to ensure that accelerators never come into direct contact with organic peroxides. In the event of chemical contamination, the same hazards exist as with thermally induced decomposition.

get price

Tech Talk - Composites Manufacturing Magazine

The mixing of organic peroxides (OPs) into unsaturated polyester resin (UPR) can make a critical difference between a good part and an increasing scrap rate. The key is in the order of mixing

get price

Unsaturated Polyester Resin-Rooflight Translucent UV ...

Never add metal salts (Accelerator) or Pre Accelerated resin to Peroxides when adding peroxides to a resin solution, mix thoroughly the resulting product Do not add organic peroxides to a hot diluents or process. Prevent contamination of Accelerator, promoter from materials like (Iron Copper, Cobalt) salts, storing acids and sanding dusts.

get price

Polyester Resin - an overview ScienceDirect Topics

To yield thermoset articles, unsaturated polyester resins are cured in the presence of a free radical initiator (‘catalyst’) eventually coupled with accelerators, depending on the application. The initiator is usually an organic peroxide at 0.5–2% weight concentration. These compounds are preferred to the azo initiators because of their good solubility in styrene and their high ...

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Process for using unsaturated polyester resin composition ...

A resin composition obtained by adding maleic anhydride to an unsaturated polyester resin composition comprising (I) an unsaturated polyester, (II) a styrene monomer, and (III) at least one polymerizable unsaturated compound, in limited amounts is low in viscosity, excellent in transparency and adhesiveness, able to prevent the generation of surface defects, and thus suitable for treating ...

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Effect of dual-initiator on low temperature curing of ...

Sep 03, 2004  An unsaturated polyester resin, Aropol Q6585, provided by Ashland Chemical was used in this study, which contains 35% styrene and 65% unsaturated polyester prepolymer by weight. The prepolymer is a step-growth product of 1:1 maleic anhydride and propylene glycol, with about 10.13 internal vinylene groups per molecule and an average molecular ...

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Control of shrinkage and residual styrene of unsaturated ...

Mar 01, 2003  Fig. 1 shows typical FTIR spectra of an unsaturated polyester resin during reaction. Consumption of styrene C C bonds is indicated by changes of peak area at 912 and 992 cm −1 (CH 2 CH deformation), while consumption of unsaturated polyester C=C bonds is indicated by a peak area change at 982 cm −1 (trans CH CH deformation) .To compensate for the changes of thickness and

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Difference Between Polyester, Acrylic, and Epoxy Resins ...

A: Acrylic resin (but not acrylic emulsion, which is the basis of acrylic paint) is a thermoplastic, which means it is one of a group of plastics which can be heated and manipulated repeatedly, whereas polyester resin and epoxy are thermosetting plastics, which use heat or a catalyst to solidify into a solid mass that won’t melt down. Acrylic is mixed from acrylic polymer, a dry powder, a ...

get price

4.4 Polyester Resin Plastic Products Fabrication

Common catalysts are organic peroxides, typically methyl ethyl ketone peroxide or benzoyl peroxide. Resins may contain inhibitors, to avoid self-curing during resin storage, and promoters, to allow polymerization to occur at lower temperatures. The polyester resin/fiberglass industry consists of many small facilities (such as boat repair

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Unsaturated Polyesters and Vinyl Esters - ScienceDirect

Jan 01, 2014  Nowadays, unsaturated polyester resins are the most widely used cross-linkable polymeric materials for composites, comprising in excess of 80% of all thermoset resins (the remainder being mostly epoxies, phenolics, acrylics, imides, and urethanes) .The increase in usage of these resins in the plastic market is mainly due to the possibility to be highly filled and to be easily processed .

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US Patent Application for UNSATURATED POLYESTER RESIN ...

Jan 15, 2014  The present invention relates to a two-component composition comprising a first component and a second component, wherein the first component being a pre-accelerated resin composition comprising an unsaturated polyester resin or vinyl ester resin and a copper2+ compound, at least one N-containing organic base selected from an amine compound and/or an ammonium salt;

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POLYESTER HAZARDS - BMJ

Polyester resins are being increasingly used in industry. These resins require the addition of catalysts andaccelerators. Thehandling ofpolyester resin systemmaterials maygive rise to skin irritations, allergic reactions, and bums. The bums are probably due to styrene and organic peroxides. Atmosphericpollution fromstyreneandexplosionandfire ...

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