Background technology
slot wedge is indispensable parts in engine, for example, application number is that the patent documentation of CN200720117687.2 discloses a kind of slot wedge structure of making of magneticsubstance, by slot wedge, bottom land wedge two portions form, slot wedge is placed in groove, and covering groove total length, the slot wedge top is placed in notch, the slot wedge top width is less than width of rebate, make between slot wedge top and notch and form the gap, slot wedge top cambered surface is fit to iron core tooth top cambered surface, the slot wedge lower end is stuck in groove and connects cell wall, the slot wedge bottom is convex, the slot wedge bottom is middle higher than both sides, slot wedge bottom coil pressing, the bottom land wedge is placed in bottom land and runs through flute length, the bottom of bottom land wedge is near bottom land, flat shape or convex are adopted in bottom land wedge top, be pressed on the loose coil in bottom.
Tradition drawing groove wedge product is generally take epoxy resin or unsaturated polyester as solvent impregnated resin, produce take alkali free glass fibre as supporting material, the insulating material temperature classification of preparation mostly is the F level like this, be up to the H level, but the bad mechanical strength such as its stretching, bending, compression, particularly more obvious under hot conditions, be difficult to reach more than 50% of normality.Along with the temperature classification of the equipment such as motor, electrical equipment, transformer is constantly upgraded, slot wedge goods physical strength is at high temperature also had higher requirement, as H level large and middle size motor and dry type transformer, the hot mechanical property of this class formation material is had higher requirement.
Present existing slot wedge goods can not satisfy the demand of electrical equipment far away.Therefore, in order to satisfy the demand of practical application, cost is low, temperature classification is high, the slot wedge goods processing technology continual exploitation of every mechanical property excellence.
Summary of the invention
The invention provides a kind of drawing groove wedge insulated impregnating resin, this solvent impregnated resin temperature classification is 200 grades, every physical strength is high, especially heat-state mechanical strength, can remain on more than 60% of normality, but also have certain flame retardant effect, and its excellent combination property, be expected to be used widely in fields such as drawing groove wedge goods.
A kind of drawing groove wedge insulated impregnating resin, its weight part consists of:
Described benzoxazine imide resin is the benzo 6-membered heterocyclic compound synthetic take phenolic compound, aminated compounds and formaldehyde as raw material-benzoxazine resin (formula I), the benzoxazine imide resin (III) that benzoxazine resin and bismaleimides (formula II) reaction makes.
() benzoxazine colophony I
(II) bismaleimides
() benzoxazine imide resin III
R wherein
1, R
2Be independently H, alkyl, aryl amine or aryl separately, for example alkyl can be selected CH
3CH
2-wait, aryl can select C
6H
5-, C
6H
4CH
3-etc.R is
Deng.
Described reactive thinner is preferably one or more mixtures in vinylbenzene, vinyl toluene, diallyphthalate acid esters, PDDA, pentaerythritol triacrylate.
Described initiator is one or both in benzoyl peroxide, dicumyl peroxide.
Described solidifying agent is one or more of acid anhydride type curing agent, boron amide class solidifying agent, imidazole curing agent.Solidifying agent methyl tetrahydro phthalic anhydride, methyl hexahydrophthalic anhydride, phenylimidazole or 594 solidifying agent of for example commonly using (2-three dislikes assorted eight rings of boron for β, β '-dimethylamino oxyethyl group-1,3,6).
Described curing catalyst is metal salt of organic carboxylic acid, acetyl acetone salt, (formula IV) is Ji the mixture of one or more of Qi phosphonium salt (formula V) for triphenylphosphine.For example, preferred fixed line promotor be in aluminium acetylacetonate, acetylacetone cobalt one or more etc. mixture.
Above-mentioned drawing groove wedge with the preparation method of insulated impregnating resin is: by formula, each component is mixed and namely obtain described drawing groove wedge insulated impregnating resin.
The present invention also provides the curing of a kind of above-mentioned drawing groove wedge with insulated impregnating resin, when using this drawing groove wedge insulated impregnating resin, can select the technique of impregnated glass according to concrete needs, and impregnation technology is general knowledge known in this field.It is to be noted, preferred condition of cure is: adopt in curing schedule mold heated to 155~180 ℃, by controlling pulling speed, controlling glass yarn and the time of resin in mould is 30~50 seconds, through the curing schedule under high temperature, insulating resin generates polyester material, the resin that is solidified togather with glass yarn, have fixing shape, size, and have simultaneously excellent physical strength etc.
Compared with prior art, beneficial effect of the present invention is embodied in:
Drawing groove wedge insulated impregnating resin of the present invention, temperature classification is high, good insulation preformance, and every physical strength is all higher, heat-state mechanical strength especially, but also have certain flame retardant effect, excellent combination property is expected to be used widely in fields such as drawing groove wedge goods; And drawing groove wedge of the present invention can use by simple mixing with insulated impregnating resin, and the preparation method is simple, and use cost is low.
Embodiment
The present invention will be described in detail below in conjunction with specific embodiment.
Below in each embodiment, novolac epoxy has all been selected the F51 on market, F44 novolac epoxy; The preparation method of benzoxazine imide resin is (" part " of relating in the preparation method is weight part):
(1) will use salt acid for adjusting pH value to 2 after 37 parts of phenol and 35 parts of mixing of formaldehyde, temperature rising reflux 2h, regulate pH to 8-9 with sodium hydroxide again, add again 11 parts, 50 parts of toluene and formaldehyde, drop into 4 in batches, 17 parts of insulation back flow reaction of 4-diaminodiphenylmethane are (the terminal point determining condition is: molding time is 4-5min/170 ℃, the little skill in using a kitchen knife in cookery) to terminal, and vacuum makes benzoxazine colophony after taking out desolventizing.
(2) adding 25 parts of dimethyl formamides in reactor in addition, be warmed up to 100-110 ℃ and add 4,15 parts of 10 parts of 4-diaminodiphenylmethane and bismaleimidess, stirring and dissolving, and (the terminal point determining condition is: molding time is 2.5-3.5min/180 ℃ to terminal at 100-110 ℃ of insulation reaction 1-2h, the little skill in using a kitchen knife in cookery), add 50 parts of benzoxazine colophonies, continuation reacts to terminal under 100-110 ℃ that (the terminal point determining condition is: molding time is 1.5-2.0min/180 ℃, the little skill in using a kitchen knife in cookery) add 20 parts of thinner toluene, namely make the benzoxazine imide resin.
Wherein:
The structure of bismaleimides used in the present invention is as follows:
Embodiment 1
According to the drawing groove wedge of the present embodiment with the formula of insulated impregnating resin be:
Benzoxazine imide resin 100g, F51 novolac epoxy 45g, initiator benzoyl peroxide (BPO) 0.8g, reactive thinner are that vinylbenzene 10g, solidifying agent are that 594 epoxy hardener 0.8g, promotor are aluminium acetylacetonate 0.5g.
After above-mentioned each component is mixed by formula, namely make high temperature resistant drawing groove wedge insulating resin.When this insulating resin uses, adopt mold heated to 180 ℃ at curing schedule, controlling the time of resin in mould is 30 seconds, and the curing schedule through under high temperature namely forms insulating material.
Embodiment 2
According to the drawing groove wedge of the present embodiment with the formula of insulated impregnating resin be:
Benzoxazine imide resin 100g, F44 novolac epoxy 45g, initiator benzoyl peroxide (BPO) 1.0g, reactive thinner are that PDDA 10g, solidifying agent are that methyl tetrahydro phthalic anhydride 45g, promotor are aluminium acetylacetonate 0.5g.
After above-mentioned each component is mixed by formula, namely make high temperature resistant drawing groove wedge insulating resin.When this insulating resin uses, adopt mold heated to 170 ℃ at curing schedule, controlling the time of resin in mould is 30 seconds, and the curing schedule through under high temperature namely forms insulating material.
Embodiment 3
According to the drawing groove wedge of the present embodiment with the formula of insulated impregnating resin be:
Benzoxazine imide resin 100g, F44 novolac epoxy 30g, initiator benzoyl peroxide (BPO) 0.6g, reactive thinner are that pentaerythritol triacrylate (APE) 15g, solidifying agent are that phenylimidazole 8g, promotor are acetylacetone cobalt 0.2g.
After above-mentioned each component is mixed by formula, namely make high temperature resistant drawing groove wedge insulating resin.When this insulating resin uses, adopt mold heated to 180 ℃ at curing schedule, controlling the time of resin in mould is 45 seconds, and the curing schedule through under high temperature namely forms insulating material.
Embodiment 4
According to the drawing groove wedge of the present embodiment with the formula of insulated impregnating resin be:
Benzoxazine imide resin 100g, F51 novolac epoxy 35g, initiator benzoyl peroxide (BPO) 0.8g, reactive thinner are that PDDA 10g, solidifying agent are that methyl hexahydrophthalic anhydride 8g, promotor are acetylacetone cobalt 0.2g.
After above-mentioned each component is mixed by formula, namely make high temperature resistant drawing groove wedge insulating resin.When this insulating resin uses, adopt mold heated to 180 ℃ at curing schedule, controlling the time of resin in mould is 60 seconds, and the curing schedule through under high temperature namely forms insulating material.
Embodiment 5
According to the drawing groove wedge of the present embodiment with the formula of insulated impregnating resin be:
Benzoxazine imide resin 100g, F51 novolac epoxy 35g, initiator benzoyl peroxide (BPO) 0.8g, reactive thinner are that PDDA 10g, solidifying agent are that methyl hexahydrophthalic anhydride 35g, promotor are acetylacetone cobalt 0.2g and Bian base triphenyl phosphonium oxide compound
After above-mentioned each component is mixed by formula, namely make high temperature resistant drawing groove wedge insulating resin.When this insulating resin uses, adopt mold heated to 180 ℃ at curing schedule, controlling the time of resin in mould is 50 seconds, and the curing schedule through under high temperature namely forms insulating material.
In sum, after each component is mixed by formula, namely get drawing groove wedge insulated impregnating resin of the present invention, this drawing groove wedge is simple, with low cost with the insulated impregnating resin manufacturing process, and this drawing groove wedge insulated impregnating resin good stability, stability in storage is good.
In addition,, with the beneficial effect of insulated impregnating resin the drawing groove wedge of embodiment 1~5 preparation is tested according to corresponding national standard with the performance of insulated impregnating resin product after actual pulling in order to prove drawing groove wedge of the present invention, be the results are shown in Table 1.
As shown in Table 1, drawing groove wedge of the present invention insulated impregnating resin good stability, drawing groove wedge of the present invention is high with the heat-drawn wire that insulated impregnating resin is used for the rear insulating material that forms of drawing groove wedge dipping, shock strength, flexural strength excellence.