CN103113604B - The preparation method of low temperature curing prepreg interlaminar shear strength during a kind of base polyurethane prepolymer for use as improves - Google Patents

The preparation method of low temperature curing prepreg interlaminar shear strength during a kind of base polyurethane prepolymer for use as improves Download PDF

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CN103113604B
CN103113604B CN201310031083.6A CN201310031083A CN103113604B CN 103113604 B CN103113604 B CN 103113604B CN 201310031083 A CN201310031083 A CN 201310031083A CN 103113604 B CN103113604 B CN 103113604B
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epoxy resin
prepreg
preparation
polyurethane prepolymer
base polyurethane
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CN103113604A (en
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李刚
杨小平
李旭
苏清福
刘大伟
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Zhongwei North Technology Co. Ltd.
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Changzhou Institute for Advanced Materials Beijing University of Chemical Technology
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Abstract

The invention provides the preparation method of low temperature curing prepreg interlaminar shear strength in the improvement of a kind of base polyurethane prepolymer for use as.First isocyanic ester and polyether glycol are obtained by reacting isocyanate terminated base polyurethane prepolymer for use as by proportion-controllable by the method, again by isocyanate terminated base polyurethane prepolymer for use as reactive grafting to bisphenol-type epoxy resin, and add composition epoxy resin and obtain toughening-modifiedepoxy resin matrix, then mix with solidifying agent and promoter component and obtain prepreg resin system, finally resin system is prepared into glued membrane, with fortifying fibre or fabric compound, the middle low temperature curing prepreg that preparation cohesiveness is excellent.Prepreg preparation technology of the present invention is reasonable, and the cohesive strength of resin system and fiber is high, and the interlaminar shear strength of matrix material obtains and obviously improves, and is particularly useful for the prepreg of low-temperature curing.

Description

The preparation method of low temperature curing prepreg interlaminar shear strength during a kind of base polyurethane prepolymer for use as improves
Technical field
The present invention relates to field of compound material, relate in particular to the preparation method of low temperature curing prepreg interlaminar shear strength in the improvement of a kind of base polyurethane prepolymer for use as.
Background technology
Along with the maturation day by day of prepreg technology, prepreg is applied to the manufacture of large-scale composite material component more and more widely, as wind power generation blade, automotive composite material component etc.Because middle low temperature curing prepreg has unique advantage in starting material, technique, production technology, suitability etc., especially the die cost of large-scale component can be saved, extend the mold use life-span, therefore, low temperature curing prepreg is more and more favored.
Because fiber, resin are different from the thermal expansivity of mold material, matrix material shrinks seriously on curing at elevated temperature, inevitablely produces internal stress at material internal, easily cause the warpage of large-scale component.Reduce solidification value, can reduce the internal stress of matrix material, but to compare hot setting matrix material lower due to cross-linked network density, middle low-temperature curing composite property is on the low side, and especially the interlaminar shear strength of matrix material is on the low side.Therefore while low-temperature curing, need the Interlaminar shear strengths improving matrix material further, improve the weather resistance of matrix material in guarantee prepreg.
Summary of the invention
The object of the invention is for the problem on the low side of low temperature curing prepreg interfacial bond property in solution, the preparation method of low temperature curing prepreg interlaminar shear strength in being improved by a kind of base polyurethane prepolymer for use as, utilize high bond strength and the shock-resistance of polyurethane modified epoxy resin, obtain the prepreg that a kind of resin and fiber have high-peeling strength and high interlaminar shear strength.
Main technical schemes of the present invention: isocyanic ester and polyether glycol add in reactor according to the molar ratio of 2:1 ~ 4:3 by (1), in 70 DEG C of reaction 4 ~ 6h, obtains isocyanate terminated base polyurethane prepolymer for use as; (2) isocyanate terminated base polyurethane prepolymer for use as and bisphenol-type epoxy resin are reacted 5 ~ 8h in the stirring tank of 60 ~ 100 DEG C, obtain the epoxy resin of polyurethane grafted modification, then add composition epoxy resin to stir, obtain toughening-modifiedepoxy resin matrix; (3) in above-mentioned toughening-modifiedepoxy resin matrix, add solidifying agent and promoter component, mix final vacuum deaeration, prepare epoxy resin for prepreg system; (4) above-mentioned epoxy-resin systems is adopted adhesive film machine film, then via compounding machine and fortifying fibre or fabric compound, prepare the middle low temperature curing prepreg that cohesiveness is excellent.
Described isocyanic ester is one or more in diphenylmethanediisocyanate (MDI), tolylene diisocyanate (TDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI); Described polyether glycol is one or more in polyoxyethylene glycol or poly(propylene oxide).
The molecular weight of described isocyanate terminated base polyurethane prepolymer for use as is 1000 ~ 2500.
Described bisphenol-type epoxy resin matrix can be one or more in bis-phenol A glycidyl ether, Bisphenol F glycidyl ether, dihydroxyphenyl propane D glycidyl ether; Described composition epoxy resin can be the mixed assemblage of bisphenol-type epoxy resin and novolac epoxy, o-cresol formaldehyde epoxy resin, bisphenol-A phenolic epoxy resin, glycidyl amine type epoxy resin.
Described isocyanate terminated base polyurethane prepolymer for use as is 5:100 ~ 15:100 with the massfraction ratio of all epoxy resin.
Described solidifying agent can be Dyhard RU 100, the one of modified dicyandiamine or its combination, and described promotor can be one or more in carbamide derivative, imdazole derivatives.
Relative to 100 parts of epoxy resin, the mass fraction of described solidifying agent is 5 ~ 10 parts, and the mass fraction of described promotor is 1 ~ 5 part.
The middle low temperature curing prepreg that described cohesiveness is excellent, its solidification value is 80 ~ 120 DEG C.
Effect of the present invention is, utilize urethane and epoxy resin compound, unique interpenetrating polymer networks (IPN) system can be formed, IPN structure force mutual tolerance and synergistic effect, the snappiness of urethane and the good heat resistance of epoxy resin and cementability are organically combined, polyurethane-modified epoxy-resin systems is made to have high-adhesive-strength, good shock-resistance and excellent lap shear strength, especially can be used for the adhesive property improving fibre reinforced prepreg, thus give the high stripping strength of prepreg and good interlaminar shear strength.The interlaminar shear strength of the prepreg that effect of the present invention is solidified for lesser temps is more obvious, specifically sees Fig. 1.
Accompanying drawing explanation
Fig. 1 is the interlaminar shear strength schematic diagram of different prepreg system.
Embodiment
Below by way of specific embodiment, more detailed description is done to the present invention:
Embodiment 1:
Isophorone diisocyanate (IPDI) and poly(propylene oxide) are added in reactor according to the molar ratio of 4:3, in 70 DEG C of reaction 6h, obtain the isocyanate terminated base polyurethane prepolymer for use as that molecular weight is 2500, by 15 parts of (mass fractions, be 100 parts with the final consumption of epoxy resin to calculate, down together) isocyanate terminated base polyurethane prepolymer for use as and bis-phenol A glycidyl ether epoxy resin react 8h in the stirring tank of 60 DEG C, then bis-phenol A glycidyl ether epoxy resin is added and glycidyl amine type epoxy resin stirs, obtain toughening-modifiedepoxy resin matrix, add 10 parts of dicy-curing agents and 5 parts of carbamide derivative promotor again, mix final vacuum deaeration, prepare epoxy resin for prepreg system.Above-mentioned resin system is adopted adhesive film machine film, then via compounding machine and fortifying fibre compound, prepares Unidirectional fiber prepreg, the prepreg cut is placed in mould, in 80 DEG C of cure under pressures 8 hours, obtain composite board, test interlaminar shear strength was 81MPa.
Embodiment 2:
Diphenylmethanediisocyanate (MDI) and polyoxyethylene glycol are added in reactor according to the molar ratio of 5:3, in 70 DEG C of reaction 5h, obtain the isocyanate terminated base polyurethane prepolymer for use as that molecular weight is 1800, 10 parts of isocyanate terminated base polyurethane prepolymer for use as and Bisphenol F tetraglycidel ether epoxy resin are reacted 7h in the stirring tank of 80 DEG C, then bis-phenol A glycidyl ether epoxy resin is added and novolac epoxy stirs, obtain toughening-modifiedepoxy resin matrix, add 6 parts of modified dicyandiamine solidifying agent and 3 parts of carbamide derivative promotor again, mix final vacuum deaeration, prepare epoxy resin for prepreg system.Above-mentioned resin system is adopted adhesive film machine film, then via compounding machine and enhanced fabrics compound, prepares carbon fibre fabric prepreg, the prepreg of cutting is placed in mould, in 100 DEG C of cure under pressures 3 hours, obtain composite board, test interlaminar shear strength was 85MPa.
Embodiment 3:
Toluene di-iso-cyanide ester (TDI) and polyoxyethylene glycol are added in reactor according to the molar ratio of 2:1, in 70 DEG C of reaction 4h, obtain the isocyanate terminated base polyurethane prepolymer for use as that molecular weight is 1000, 5 parts of isocyanate terminated base polyurethane prepolymer for use as and bis-phenol A glycidyl ether epoxy resin are reacted 5h in the stirring tank of 100 DEG C, then bis-phenol A glycidyl ether epoxy resin is added and novolac epoxy stirs, obtain toughening-modifiedepoxy resin matrix, add 5 parts of dicy-curing agents and 1 part of carbamide derivative promotor again, mix final vacuum deaeration, prepare epoxy resin for prepreg system.Above-mentioned resin system is adopted adhesive film machine film, then via compounding machine and fortifying fibre compound, prepares Unidirectional fiber prepreg, the prepreg of cutting is placed in mould, in 120 DEG C of cure under pressures 1.5 hours, obtain composite board, test interlaminar shear strength was 87MPa.
Comparative example 1:
Bis-phenol A glycidyl ether epoxy resin and glycidyl amine type epoxy resin are stirred in the reactor of 60 DEG C, add 10 parts of modified dicyandiamine solidifying agent and 5 parts of carbamide derivative promotor again, mix final vacuum deaeration, prepare epoxy resin for prepreg system.Above-mentioned resin system is adopted adhesive film machine film, then via compounding machine and fortifying fibre compound, prepares Unidirectional fiber prepreg, the prepreg of cutting is placed in mould, in 80 DEG C of cure under pressures 8 hours, obtain composite board, test interlaminar shear strength was 65MPa.
Comparative example 2:
Bis-phenol A glycidyl ether epoxy resin and novolac epoxy are stirred in the reactor of 80 DEG C, then adds 6 parts of dicy-curing agents and 3 parts of carbamide derivative promotor, mix final vacuum deaeration, prepare epoxy resin for prepreg system.Above-mentioned resin system is adopted adhesive film machine film, then via compounding machine and fortifying fibre compound, prepares carbon fibre fabric prepreg, the prepreg of cutting is placed in mould, in 100 DEG C of cure under pressures 3 hours, obtain composite board, test interlaminar shear strength was 73MPa.
Comparative example 3:
Bis-phenol A glycidyl ether epoxy resin and novolac epoxy are stirred in the reactor of 100 DEG C, then adds 5 parts of dicy-curing agents and 1 part of carbamide derivative promotor, mix final vacuum deaeration, prepare epoxy resin for prepreg system.Above-mentioned resin system is adopted adhesive film machine film, then via compounding machine and fortifying fibre compound, prepares Unidirectional fiber prepreg, the prepreg of cutting is placed in mould, in 120 DEG C of cure under pressures 1.5 hours, obtain composite board, test interlaminar shear strength was 79MPa.

Claims (8)

1. a base polyurethane prepolymer for use as improve in the preparation method of low temperature curing prepreg interlaminar shear strength, it is characterized by, comprise the following steps: isocyanic ester and polyether glycol add in reactor according to the molar ratio of 2:1 ~ 4:3 by (1), in 70 DEG C of reaction 4 ~ 6h, obtain isocyanate terminated base polyurethane prepolymer for use as; (2) above-mentioned isocyanate terminated base polyurethane prepolymer for use as and bisphenol-type epoxy resin are reacted 5 ~ 8h in the stirring tank of 60 ~ 100 DEG C, obtain the epoxy resin of polyurethane grafted modification, then add composition epoxy resin to stir, obtain toughening-modifiedepoxy resin matrix; (3) in above-mentioned toughening-modifiedepoxy resin matrix, add solidifying agent and promoter component, mix final vacuum deaeration, prepare epoxy resin for prepreg system; (4) above-mentioned epoxy-resin systems is adopted adhesive film machine film, then via compounding machine and fortifying fibre or fabric compound, prepare the middle low temperature curing prepreg that cohesiveness is excellent.
2. preparation method according to claim 1, is characterized in that: described isocyanic ester is one or more in diphenylmethanediisocyanate (MDI), tolylene diisocyanate (TDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI); Described polyether glycol is one or more in polyoxyethylene glycol or poly(propylene oxide).
3. preparation method according to claim 1, is characterized in that: the molecular weight of described isocyanate terminated base polyurethane prepolymer for use as is 1000 ~ 2500.
4. preparation method according to claim 1, is characterized in that: described bisphenol-type epoxy resin is one or more in bis-phenol A glycidyl ether, Bisphenol F glycidyl ether, dihydroxyphenyl propane D glycidyl ether; Described composition epoxy resin is the mixed assemblage of bisphenol-type epoxy resin and novolac epoxy, o-cresol formaldehyde epoxy resin, bisphenol-A phenolic epoxy resin, glycidyl amine type epoxy resin.
5. preparation method according to claim 1, is characterized in that: described isocyanate terminated base polyurethane prepolymer for use as is 5:100 ~ 15:100 with the massfraction ratio of all epoxy resin.
6. preparation method according to claim 1, is characterized in that: described solidifying agent can be one or more in Dyhard RU 100, modified dicyandiamine, and described promotor can be one or more in carbamide derivative, imdazole derivatives.
7. preparation method according to claim 1, is characterized in that: relative to 100 parts of epoxy resin, and the mass fraction of described solidifying agent is 5 ~ 10 parts, and the mass fraction of described promotor is 1 ~ 5 part.
8. preparation method according to claim 1, is characterized in that: the middle low temperature curing prepreg that described cohesiveness is excellent, and its solidification value is 80 ~ 120 DEG C.
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