Thermally curable binder for composite materials

FIELD: polymer materials and composites.

SUBSTANCE: invention relates to epoxide compositions, in particular to preparation of hot-molded thermally curable epoxide compositions used as binders in manufacture of composite materials and products thereof. Binder comprises 60-70% 4,4'-isopropylidenediphenol epoxide resin, amine-type curing agent, and additionally 5-15% aliphatic epoxide resin (DEG-1) and 1-5% phenyl glycidyl ether. Curing agent (utilized in balancing amounts) is aniline-formaldehyde condensation product, condensation being carried out in presence of acid catalyst and giving aminobenzylaniline as main condensation product.

EFFECT: achieved high and stable physicochemical characteristics of glass-plastic articles.

2 tbl, 5 ex

 

The invention relates to the field of technology epoxy compositions, in particular the production of thermoset epoxy compositions thermoforming used as a binder for the production of composite materials and products from them, such as reinforced plastic pultruded method.

The invention can be used in the construction industry, namely for the manufacture of plastic reinforcing elements for the reinforcement of concrete structures, which can also be used in load-bearing precast structures as structural material to replace metal and wooden products. The invention is intended for use as impregnating compositions, adhesives, coatings, adhesives for structural fiberglass, also produced by the method of wet wound.

Known binder composition for the manufacture of basalt rebar containing mass epoxy Dianova resin, 2,4,6-Tris-(dimethylamino)METHYLPHENOL (Accelerator UE 6062) and polymethylenepolyphenylene, which is the product of interaction of aniline and formaldehyde, and containing 51-57 wt.% diaminodiphenylmethane, mainly 95-97 wt.%, 4,4 - isomer.

Known polymer composition comprising epoxy Dianova resin, diglycidyl ether p is liabilitya, diglycidyl ether of diethylene glycol, the eutectic mixture of aromatic amines and salicylic acid (A.S. N 1014859, CL 08 L 63/02, 1983).

The disadvantage of the composition is its lack of suitability for the manufacture of fiberglass products using wet wound (especially in industrial scale) due to the high viscosity at the temperature of 20°With (2500 Spa) and, as a consequence, poor impregnation of the reinforcing material (rovings twisted yarns, tapes), may adversely affect the achievement of high and stable physical and mechanical properties of fiberglass products.

Most similar to that proposed by the technical nature of a thermosetting composition used for the manufacture of composite materials, including epoxy Dianova resin, diglycidyl ether of diethylene glycol and the eutectic mixture of aromatic amines containing additionally a mixture of dioxane high-boiling alcohols and their esters with stabilizer ionol, and as aromatic amines - metaphenylenediamine and 4,4-diaminodiphenylmethane in the following ratio of components, parts by weight: epoxy Dianova resin 100, diglycidyl ether of diethylene glycol 25-35, a mixture of dioxane high-boiling alcohols and their esters with stabilizer ionol 4-12, the eutectic mixture of aromatic amines containing metaphenylene the n and 4.4-diaminodiphenylmethane ratio of 35:65-65:35:20-40.

The present invention solves the problem of expanding the range of thermoset epoxy compositions used for the manufacture of composite materials.

This task is solved in that the known composition of thermosetting binder for composite materials, including epoxy Dianova resin, diglycidyl ether of diethylene glycol and amine hardener according to the invention further comprises phenylglycidyl ether, and as a hardener it contains Bentham ABA, which is a product of condensation of aniline and formaldehyde in the presence of an acid catalyst and containing aminobenzylpenicillin as the basic substance, the following ratio of components, wt.%

Epoxy Dianova resin 60-70

Diglycidyl ether of diethylene glycol 5-15

Phenylglycidyl ether 1-5

Hardener else

The composition is prepared by mixing the starting components at room temperature and used for the manufacture of reinforced plastics.

Table 1 shows the variations of composition the proposed composition and its properties. Table 2 shows the results of the tests rebar (d 5-6 mm), made of the proposed composition by pultrusion with subsequent thermotherapies.

Table 1
№ p/pThe composition in wt. %Properties of composition
 EDDeg-1FGABentham ABATensile strength, MPaThe modulus of elasticity, MPaRelates. the elongation in%
1601022833,12309,1
265522839,027613,0
368212945,330026,0
462353042,428020,9
567732325,520018,1
Note: ED - epoxy Dianova resin in examples 1 and 2 used resin ED-20, in the rest of ED-22; deg-1 - diglycidyl ether of diethylene glycol; FGA-phenylglycidyl ether.
Table 2
number ofThe composition of the rod wt. %Properties of the obtained rods
 BinderFillerDensity, g/cm3Tensile strength MPa (n/mm2)Bending strength MPa (n/mm2)Alkali,%
1.2.3.4.5.6.7.
125751,9210807408,0
223 771.9312008503,5
330701,911180840the 3.8
420801,9110707607,4
525751,9212308504.2

Note:

1. In examples 1 and 4 as filler used fiberglass, other - basalt roving.

2. Alkali - loss of tensile strength after soaking the sample in 4%sodium hydroxide solution at 95°With during the day.

Thermoset binder for composite materials, including epoxy Dianova resin and amine curing agent, characterized in that it further contains an aliphatic epoxy resin deg-1 and phenylglycidyl ether, and as a hardener contains Bentham ABA, which is a product of condensation of aniline and formaldehyde in the presence of Ki the pilot catalyst and containing aminobenzylpenicillin as the basic substance in the following ratio of components, wt.%:

Epoxy Dianova resin 60-70

Aliphatic epoxy resin deg-1 5-15

Phenylglycidyl ether 1-5

Hardener Else



 

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