乙烯基树脂(Vinylresin)

乙烯基树脂（Vinyl resin）

乙烯基树脂(Vinyl resin)

The characteristics of Vinyl Ester Resins are internationally recognized and highly resistant to corrosion.

A, standard bisphenol A epoxy vinyl resin is made from methyl

acrylic acid with bisphenol A epoxy resin was synthesized by vinyl resin, styrene is soluble in solution, the type of resin has the following features:

1. The double bond at both ends of the molecular chain is extremely lively, so that the vinyl resin can solidify rapidly, which can be used

in a rapid way, and the highly corrosive polymer is obtained.

2. Synthesis of methyl acrylic acid, methyl at the edge of ester

bond can protect and improve the hydrolysis resistance;

3, the resin contains ester bonds, which are 35 to 50% less per mole than chemical polyester (UPR).

4. The more secondary hydroxyl groups can improve the wetting and adhesion of the glass fiber and improve the mechanical strength of the laminated products.

5. Because it is only crosslinked at both ends of the molecule, the molecular chain can elongate under the action of stress to absorb external forces or thermal shock, showing resistance to microcrack or cracking.

Flame retardant vinyl resin is generally synthesized from brominated epoxy resin. Due to the bromine in resin, the flame

retardant vinyl resin is resistant to chemical resistance. Vinyl resin base coating

The phenolic epoxy resin was introduced into the framework of vinyl ester resin. The synthetic vinyl ester resin was generally called Novolac vinyl ester resin. Resin has high thermal stability. When the resin solidifies, the crosslinking density is large. Its thermal deformation temperature of 120-135 ?, can prolong the service life and excellent corrosion resistance, especially for chlorine solution or organic solvent corrosion resistance is good. In order to adapt to the needs of high temperature resistant strength situation, more manufacturers to modified phenolic epoxy vinyl ester resin, improve the crosslinking density and heat-resistant property of the resin, it has excellent acid, solvent resistance, corrosion resistance and oxidation resistance, suitable for all kinds of high temperature and strong corrosion conditions, such as desulfurization (FGD) device, such as high temperature chimney.

Editing this section of the flexible vinyl ester resin in order to meet the needs of the various anti-corrosion engineering construction, developed the flexible vinyl ester resin, flexible vinyl ester resin has high adhesion on the surface of a steel and concrete, compared with the traditional epoxy vinyl ester resin and its elongation and higher bonding strength greatly increased, the impact strength increased nearly

four times, interlaminar strength increased by 20%, and unique wear resistance.

(1) for corrosion resistant lining, stitching material or

coating resin, such as overall mortar floor bottom in the making,

can be omitted the domestic operation of glass fiber reinforced plastic isolation layer is made, at the same time of improving the overall performance, also can save cost;

(2) adhesion of various materials;

In combination with Kevlar or other reinforced materials for high strength and wear-resistant products such as sports or military helmets, sailboats, etc.

Edit this paragraph PU this type resin is modified epoxy vinyl ester resin by carbamate (TDI) of epoxy vinyl ester resin was modified, both within the chain is not saturated and unsaturated chain side. Compared with the usual bisphenol A epoxy vinyl ester resin, it has excellent corrosion resistance, flexibility and good process. Due to the introduction of carbamate,

It improves the compatibility of resin and fiber, and can maintain the good air drying on the resin surface. It can be suitable for winding and other processes.

Edit this section of the other application of the domestic market of vinyl ester resin in addition to the above varieties, there are two broad categories: one kind is more vendors using acrylic type vinyl ester resin, or on the basis of the resin modified by urethane

processing, this type of resin heat resistance level lower than the corresponding methyl acrylic acid type vinyl ester 10-20 ?, the elongation of the resin,

but due to lack of methyl ester on key protection, led to the

decrease of the corrosion resistance of resin such as alkali resistance; Another type of resin is the special products in our country, it is fumaric acid modified bisphenol A epoxy vinyl ester resin, but in A strict sense, it does not belong to the vinyl ester resin, but the

vinyl ester resin and bisphenol A unsaturated polyester resin in A transitional species, this type of vinyl ester resin has high

crosslinking density, the characteristics of brittleness and shrink the big, because the ester bond content in resin is higher than standard

vinyl resin 40-50%, so the relatively poor alkali resistance. Vinyl

ester resin [1]

The development of a low-shrinkage vinyl resin was developed by the new technique of editing the vinyl ester resin

Vinyl ester resin as the category of unsaturated polyester resin,

high activity, curing reaction rate faster, cause of vinyl ester resin curing after curing shrinkage rate, general unsaturated polyester resin (including conventional vinyl resin) curing shrinkage is bigger, can achieve body contraction of around 7-10%, with the improvement of technical requirements for high performance resin at home and abroad, hope to find some low curing shrinkage of vinyl ester resin, this is one of the many manufacturers at home and abroad to seek technology

breakthrough. The mechanism of the low shrinkage resin is more complicated, and some manufacturers in order to overcome the resin curing shrinkage, low shrinkage additive (LPA) by adding methods to achieve a goal, but has its limitations in the application, and manufacturers are making more efforts to the resin synthesis method and molecular design level up to solve the technical problems, Low shrinkage of epoxy vinyl ester resin with its has enough mechanical strength and stiffness, enough size stability, heat cycle, better corrosion resistance of the unique performance meet the requirements of high-quality FRP products.

2 resistant vinyl ester resin:

Vinyl ester application at present most occasions is corrosion occasion, but because has more secondary hydroxyl vinyl resin, can improve the wettability of the glass fiber and caking property, improve the mechanical strength of laminated products; In addition, it is cross-linked at both ends of the molecule, so the molecular chain can be elongated under the stress, to absorb external forces or thermal shock, and show resistance to microcrack or cracking. Therefore, vinyl resin in some applied in requirements Gao Lixue performance, impact resistance, but regular vinyl resin in endurance study impact or needs to be improved, especially with fumaric acid modified some of the vinyl resin, because this type of resin curing high crosslinking density, junction between the molecular chain segments is shorter, so the poor impact resistance performance. In the synthetic design of these resins, it is

required that there are more ether bonds on the main chain of resin molecules, so that the resistance of the resin can be improved sufficiently. Now there is another way,

In rubber modified, by using end carboxyl nitrile rubber (CTBN) and nitrile rubber (BNR) toughening methyl acrylic epoxy vinyl ester resin, just after the kind of methods at home and abroad, a lot of work, the elongation of natural rubber modified vinyl

resin such as been improved greatly, and can reach 12%.

Generally the impact strength of vinyl resin (no gap) is not greater than 14.00 KJ/M2, and now some of the new development of impact resistance of rubber modified vinyl resin can reach more than 22 KJ/M2, rubber modified vinyl resin can be up to 25 KJ/M2, so the impact resistant vinyl resin can the very good application in some high impact resistance of FRP production, such as sport sleigh, sport helmet, etc.

3 thickened with vinyl ester resin

As a kind of high-performance unsaturated resin, vinyl resin thickening properties of manufacturers has always been the research direction, this is because the unique application characteristics of BMC/SMC recognised by the majority of customers, especially with the BMC/SMC application in automobile parts, thickening type vinyl resin is the impact of the general higher unsaturated resin, and good creep resistance and fatigue resistance. These parts include wheels, seats, heat sinks, gate plates, engine valves, etc. Of course, the thickened

vinyl resin can be widely used in the production of electric insulation, industrial pump valve and golf first class.

As a kind of thickened vinyl resin, nature requires the following characteristics: the good infiltration of materials and fillers; Initial low viscosity and fast thickening properties; Good mechanical properties including toughness and fatigue resistance; Long storage cycle; Lower curing exothermic peak and low - ethylene volatilization. To use effect, in the synthesis of vinyl resin, the more common method is: the original introduction of acidic functional groups on vinyl ester molecule (carboxylic acids) and reusing the carboxyl and alkaline earth metal oxides, such as magnesium oxide, calcium oxide, etc.), but this method long thickening time, generally need a few days, the condition is sensitive to moisture content. Now also developed another method, which USES isocyanate and polyol reaction to produce mesh structure, so as to achieve rapid thickening of the resin, this method is suitable for low pressure molding, stable viscosity control, low requirements for temperature and humidity, stored for a long period, at the same time products combined with the characteristics of high strength between the layers, at the same time also can use low acid value resin with excessive alcohol as thickening agent.

High temperature vinyl resin

Vinyl resin molecular skeleton is epoxy resin, if using phenolic epoxy resin as raw materials, the synthesis of NOVOLAC vinyl resin has good corrosion resistance, solvent resistance and high temperature

resistant type, we at home and abroad well-known manufacturers of phenolic epoxy vinyl ester resin in accordance with the relevant

national standards of testing, the results show that thermal deformation temperature (HDT) of the resin are between 132-137 ?, and some domestic manufacturer of phenolic epoxy vinyl resin thermal deformation temperature is lower, lower than 125 ?, but in the practical application in some industries, just to resin heat resistance is put forward higher request,

A few manufacturers at home and abroad such as Shanghai rich morning provide high crosslinking density of vinyl resin 898 thermal deformation temperature can reach 150 ? above, the type resin molecular structure has been modified, to optimize the heat resistant properties of the resin, styrene content also made a reasonable adjustment to meet the actual demand. More conventional phenolic epoxy vinyl resin has higher heat resistance temperature, can be applied to 200 ? in air over a long period of strong corrosive environment, at the same time the use of our experience shows that this type of resin can be in 2-3 minutes under

300 ? temperature impact, the unique application is the insulation applications, can achieve insulation class C level above all.

This type of resin can be widely applied in some smelting, power desulfurization (FGD) equipment such as high temperature applications, such as cooling towers, chimneys, and chemical pipelines, etc., at the same time this type of resin has the characteristics of strong resistance to solvents and strong oxidizing medium.

5 photosensitive vinyl resin

Because of vinyl resin in the unsaturated double bonds in molecular chain end, because activity is higher, at the same time with molecular design, such as using high epoxy value of epoxy resin, using acrylic instead of methyl acrylic acid synthesis vinyl resin, add light

initiator (e.g., benzoquinone, benzoin ether, etc.), to absorb

ultraviolet light energy, and passed to the resin system, and make the aggregated vinyl resin curing.

This kind of resin can be used in printing, photosensitive ink, etc., used as photosensitive coating in the paint industry, and used in the radio industry as the photoinduced corrosion film on PCB. In addition,

in the pultrusion process, such as the use of photosensitive vinyl resin, it can greatly improve the squeezing speed, such as in the cable core pulling process, the speed can reach 10m/min.

6 air dry

Vinyl ester resin is the same as unsaturated polyester resin. When normal temperature is solidified, the surface of the product has a

sticky phenomenon, which causes inconvenience to the application. The main reason is that the oxygen in the air takes part in the polymerization of the vinyl ester resin surface. To overcome this shortcoming, researchers have developed many effective methods. One of them is to use the CH2 = ch-ch2 - O -) group in the vinyl ester resin structure to synthesize the gas - dry vinyl ester resin. This kind of

resin is suitable for the production of high-grade air - dry adhesive, coating, sealing fabric, etc.

It is worth noting that the content of allyl ether in the resin has

a suitable value, which is too small for the resin to absor

b oxygen well. Too large, because of the function of "automati

c blocking an

d accumulation", th

e air drying is also reduced.

Low styrene volatilization technology

Vinyl resin generally contains about 35% of styrene monomer,

styrene and low vapor pressure, therefore in hand paste molding and injection molding, the resin is spread layers of compound on the open mold, injection molding, in particular, resin part into mist, and before the resin cured fully, styrene volatilization from the resin, so at the same time of styrene loss, but also pollutes the environment, also caused damage to the health of workers, so countries have raised for styrene threshold limit value (the TLV) requirement, so for diluted with styrene as monomer of unsaturated resin including vinyl resin, want to seek a kind of low styrene volatilization technology (LSE) in order to solve this problem, some manufacturers and original countries have adopted such as add paraffin as inhibitor,

But easy to cause layer between layers, but the current development trend is: one is to use a kind of adhesion promoter compounds, for acrylic, with 2 hydroxyl (contain a double bond of hydrophobic ether or ester), etc.; The second is the use of relatively high vapor pressure monomers such as methyl styrene or vinyl toluene; Three methods such as

molecular structure, or while maintaining the overall performance of the main chain molecules, in order to reduce the dosage of styrene, or by introducing other groups on the molecular chain segment or segment, the resin internal molecular interactions to further reduce the

volatilization of styrene, etc. On the basis of many years of research and experiment, many manufacturers in the world have introduced the characteristics of low styrene volatility technology. This technology can be widely used in resin coating and insulation application, especially in high temperature forming insulation application.

Ethylene - base resin varieties

Currently, vinyl resin with good corrosion resistance

characteristics and improved process characteristics, and plenty of successful application in anticorrosion occasions, including corrosion resistant FRP production, anti-corrosion engineering, etc., but in some of the corrosion situation and have Gao Lixue performance requirements of composite materials, customers can only choose epoxy vinyl resin at home and abroad, it is in fact caused the waste of resin application or design, so some foreign and domestic manufacturers are trying to find a keep the vinyl resin mechanical properties, the reasonable cost of new materials, is part of the company's new developed launched a new type of high-performance, unsaturated resin called vinyl polyester resins, English named vinyl polyester resin, referred to as "domestic" VPR "synthesis of vinyl ester resin, the resin and general characteristics of unsaturated resin, so that users have more choice.

VPR styrene vinyl polyester resin is a kind of soluble in liquid containing unsaturated double bond of the special structure of unsaturated polyester resin, VPR vinyl polyester resin has good corrosion resistance, is better than that of benzenoid between unsaturated resin, mechanical properties and fairly standard epoxy vinyl resin, especially the fatigue property and dynamic load resistance; In addition, the general resin, VPR vinyl polyester resin has excellent weather resistance, at the same time VPR vinyl polyester resin and has good fiberglass infiltration properties and process performance,

suitable for all kinds of FRP molding process, including the filament winding, pultrusion, hand lay-up, injection and other

composite material technology.

Due to the unique performance of VPR vinyl polyester resin and its reasonable cost, the new material has a wide application prospect: the reinforced concrete of the glass reinforced concrete in concrete; (2) structural materials in ship products; The structure layer material in large FRP product production, especially in the whole field can be replaced by the regular vinyl resin structure layer; The fatigue strain FRP extruding section, such as moving FRP bar, etc.