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The matrix material, unsaturated polyester resin
promulgator:admin    Release time:2013/5/31    Hits:9370

Vinyl resin has good comprehensive performance: because the unsaturated double bond at the end of the polymer molecular chain, double bond is very lively, the curing time is not affected by the influence of steric hindrance, in the organic peroxide initiator, crosslinking curing by adjacent chains, but also with the poly styrene monomer curing of resin chain; in the R group can shield the ester bond, improve the ester bond chemical property and hydrolytic stability; the vinyl resin, ester bond of relative molecular mass of each unit than ordinary unsaturated polyester in 35% ~ 50%,

Unsaturated polyester resin is two unsaturated dicarboxylic acid (or anhydride) or their saturated carboxylic acid with two yuan (or anhydride) composed of mixed acid and polyol condensation, linear polymer compounds having ester and unsaturated double bond. Usually, polyesterification polycondensation reaction is carried out in 190 ~ 220, until it reaches the expected value (or viscosity). In the polyester chemical shrinkage after the reaction, while the vinyl monomer heat amount, into a viscous liquid, such as polymer solution of unsaturated polyester resin.

not full physical and chemical properties of the polyester resin

1, physical properties of unsaturated polyester resin in the relative density of 1.11 ~ 1.20, cure volume shrinkage is larger, some physical properties of the cured resin:

The heat resistance. The vast majority of unsaturated polyester resin thermal deformation temperature at 50 ~ 60 ℃, some good heat-resistant resin is up to 120. Heat expansion coefficient α 1 (130 ~ 150) × 10-6 ℃.

The mechanical properties of. Unsaturated polyester resin has high tensile, bending, compression strength.

The resistance to chemical corrosion. Properties of unsaturated polyester resin in water, dilute acid, dilute alkali is better, performance of organic solvent resistance is poor, at the same time, chemical resistance of resin with its chemical structure and geometry switch, can have very big difference.

The dielectric properties. Dielectric properties of poly unsaturated acid resin is good.

2, the chemical properties of unsaturated polyester is the linear polymer compounds with multifunctional group, with polyester chain and unsaturated double bonds in the backbone chain, and both ends of the macromolecular chain with carboxyl and hydroxyl groups.

The double bond in the main chain and vinyl monomer copolymerization crosslinking reaction, the unsaturated polyester resin from soluble, molten state can be transformed into insoluble, no melting state.

Ester bond in the main chain can undergo hydrolysis, acid or alkali can accelerate the reaction. If the copolymerization with styrene after crosslinking, can greatly reduce the hydrolysis reaction.

In acidic medium, the hydrolysis is reversible, so incomplete, polyester, erosion capability of acidic medium; in alkaline medium, due to the formation of a carboxylate anion resonance stabilized, hydrolysis become irreversible, so polyester alkali resistance is poor.

The polyester chain end carboxyl and alkaline earth metal oxide or hydroxide [such as MgO, CaO, Ca (OH) 2] reaction, the unsaturated polyester molecular chain extension, could eventually form a complex. Molecular chain extension can make the initial viscosity is 0.1 ~ 1.0Pa · s viscous liquid resin, in a short period of time to more than 103Pa · s viscosity plays, until it becomes a similar gel can not flow, not sticky. The resin is in this state is not cross-linked, still in a suitable solvent solubility, good fluidity of heating

The relationship between structure and properties of unsaturated polyester resin

So far, the domestic externally as a composite matrix of the unsaturated polyester matrix (resin) basically is phthalic acid type two (referred to as phthalate), benzene two formic acid type (referred to as benzene), bisphenol A and vinyl ester, unsaturated polyester resin, a halogenated.

1, the phthalate unsaturated polyester and isophthalic unsaturated polyester

The adjacent benzene two formic acid and isophthalic acid are two isomers, which unsaturated polyester molecular chain synthesis are adjacent benzene and benzene, although the molecular chain structure are similar, but the isophthalic unsaturated polyester and phthalate unsaturated polyester, has some of the characteristics of the following: with isophthalic acid can be prepared two benzene between higher molecular weight two formic acid ester of unsaturated speech, make curing products have good mechanical properties, toughness, heat resistance and corrosion resistance; benzene between two formic acid polyester purity degree, with benzene two formic acid and low molecular weight between two formic acid ester impurities without residual resin; the ester bond between two formic acid polyester molecular chain on the protected benzene between two formic acid effect of steric hindrance, phthalic acid ester bond of two polyester molecular chain on the more vulnerable to water and other corrosive media invasion, with two formic acid polyester resin prepared glass fiber reinforced plastic soaked in 71 ℃ saturated sodium chloride solution in a year later still has fairly high performance.

2, bisphenol A type unsaturated polyester

Bisphenol A type unsaturated polyester and phthalate unsaturated chemical structure of poly acid and isophthalic unsaturated polyester macromolecular chain compared with ester bond, spacing in the molecular chain is easy to be damaged by hydrolysis increased, thereby reducing the ester bond density; bisphenol A unsaturated polyester and spatial effect of styrene crosslinking polymerization after curing, shielding and protective effect on ester, hindered the hydrolysis of ester bond; and in the molecular structure of Neopentyl, connected with two benzene rings, keep the stability of chemical melon, so this kind of resin with acid, alkali and water resistance good solutions to.

3, vinyl resin

Vinyl resin is also called the epoxy acrylic resin, is a new type of resin 60 time development rises, its characteristics are terminated unsaturated double bonds in polymers.

This will improve the hydrolytic stability of the resin in acid, alkali solution; the chain of secondary hydroxyl resin and glass fiber or other fiber wettability and bonding in order to improve the strength of the composite; the backbone of epoxy resins, it can be endowed with vinyl resin toughness, ether bond in the main chain of the resin molecular has excellent acid resistance.

Varieties and properties of vinyl resin, with the raw materials is different and have extensive changes, according to the requirements for the properties of resin composite material design of molecular structure.

4, halogenated unsaturated polyester

Halogenated unsaturated polyester by means of chlorendic anhydride (HET anhydride) as saturated dicarboxylic acid (anhydride) a chloride synthesized generation of unsaturated polyester.

Chlorinated unsaturated polyester resin has been used as excellent self-extinguishing properties of the resin to use. But recent studies show that chlorinated unsaturated polyester resin has good corrosion resistance, which in some medium corrosion resistance and bisphenol A unsaturated polyester and vinyl ester resins are basically the same, and in some cases (such as wet chlorine) in corrosion resistance is better than vinyl resin and bisphenol a A unsaturated polyester resin.

Hot wet chlorine in unsaturated polyester resin contact will occur after the reaction and produce chlorinated unsaturated polyester resin or "chlorine cream". Made of bisphenol A unsaturated polyester and vinyl ester resin produced "chlorine cream" character soft, wet chlorine through the "chlorine cream" layer further (corrosion) permeability, but by chlorinated unsaturated polyester produced "chlorine cream" characters hard, can prevent wet chlorine further (corrosion) permeability.

commodity resins

Unsaturated polyester resin varieties and grades of quito. From the product performance, used as the matrix of composites, the following types.

1, general-purpose resin general-purpose resin is mainly the phthalate unsaturated polyester resin, also including some isophthalic unsaturated polyester resin, they are mostly used for hand lay-up of glass fiber reinforced plastic products.

2, heat-resistant resin unsaturated polyester resin for application at high temperature, thermal deformation of general-purpose resin at low temperature is not applicable. The temperature should not be less than 110 heat-resistant resin thermal deformation, high strength with retention rate at high temperature.

3, chemical resistant resin this kind of resin has excellent corrosion resistance and water resistance, commodity resins are bisphenol A type unsaturated polyester resin, vinyl resin, isophthalic unsaturated polyester resin and halogenated polyester resins.

4, flame retardant resin and flame retardant resin is used to produce a flame retardant in synthesis (self-extinguishing) components, such as the use of four bromo benzene anhydride, chlorendic anhydride (HET anhydride) substituted phthalic anhydride generation synthetic resin.

5, weather resistant resin this kind of resin using neopentyl glycol and methyl acrylate monomer, and add the UV absorber, improve the weatherability and light stability of resin. The resin has good transparency, refractive durable resin casting rate index and glass fiber was similar or consistent.

6, the high strength resin resin with high strength and toughness, mainly used for fiber winding composite material preparation

7, coating resin used for coating layer of composite material, in order to improve the product appearance (appearance), quality and service life. According to the use requirements, gel coat resin is mainly divided into the following categories:

General type gel: corrosion resistance, wear resistance, boiling water, soap or detergent, having a surface gloss good; the chemical corrosion resistant coating: used for surface corrosion products; the light stable gel: with excellent weather resistance; the food container for gel coat.

8, SMC or BMC special resin for this kind of resin with low viscosity:; thickening rapidly; the high activity; fast curing; in addition of the initiator, a few months after the storage period of thickener performance is stable, and trying to be cured.

9, other types of resin which is the new varieties in recent years, such as injection, RTM, pultrusion molding process special resin.

 
 

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