SU896033A1 - Epoxy composition for producing electroengineering and structural articles - Google Patents

Description

one

This invention relates to the field of epoxy thermoset plastics processed by injection molding on injection molding machines. The composition is intended for the manufacture of products of electrical and structural purposes.

Sinrez firm. Almoko has developed epoxy heat-resistant compositions processed by injection molding at injection molding machines. The materials contain epoxy resin based on bisphenol A and epichlorohydrin, ammine or acid hardener, mineral filler or short fiberglass. The materials have high deformation heat resistance with long-term heat resistance at 200-220 С 1.

However, they have relatively low indices. Physical and mechanical properties: tensile strength on bending 900-1100 kgf / cm, impact strength k-6 kg “cm / cm. The disadvantages of materials should also include their high reactivity, which is why they quickly age when stored under normal conditions. In order to preserve the technological properties over time, the materials of Sinrez Almoco require, during storage, a regime of low temperatures, which is associated with additional investment costs. In addition, the technological disadvantage of these materials is their low dimensional stability, which is observed when processing epoxy compositions in the mode of high-speed casting cycles when they are cured with acid hardeners. Castings obtained from such compositions have an increased plasticity in the hot state, which causes a distortion of their geometry at the time of taking out of the mold and automatically dropping products. Products often require manual removal. The closest to the technical essence of the invention is the composition for obtaining castings with increased resistance to heat loads, containing diglycidyl ether, α-dioxidiphenylsulfone, hardener - methylendehyde anhydride, accelerator and filler. Castings have a long-lasting heat resistance. 12 A disadvantage of the known composition is the presence of technological difficulties in combining the components, since the softening temperature of the resin based on bisphenol S 1 b O. The purpose of the invention is to reduce the curing time while maintaining mechanical strength and thermal stability. The goal is achieved by the fact that a composition containing diglycidyl ether, 4-dioxidiphenylsulfone, epoxy-diane resin, hardener, filler and lubricants, as a hardener, contains phenol-formaldehyde aniline resin as a filler - glass fiber but with fiber length of 3-7 mm and additionally, - dioxydiphenylsulfone in the following ratio of components, weight: 4,4-dioxydiphenylsulfone diglycidyl ether 17,, 00 Epoxy-diane resin, 2-, S8 Phenol-formaldehyde aniline resin 10.03-11, + 0, -ioxydiphenylsulfone 0.27-0, 7 Smazy Agents 2.0-3.60 Fiberglass Else Introduction to the composition as a phenol-formaldehyde resin hardener, in contrast to anhydrite hardeners, traditionally used to produce thermo and heat-resistant materials, allows to obtain rigid networks during the casting cycle 80 -110 s, to significantly increase the dimensional stability of castings, to eliminate their deformation and distortion of the geometric shape when extracted from the form. To improve the conditions of plasticization of the material in the cylinder and reduce its adhesion to the walls of the cylinder and the forming surfaces of the form, lubricants of external and internal action — calcium ssarate and mountain wax — are included in the composition. As shown by rheological studies, the proposed component composition of the injection molded thermoset is not sensitive to an increase in the velocities and shear stresses in comparison with the known injection phenoloplasts. This property of the proposed material - the lack of sensitivity to increased stresses and shear rates - allows it to be processed on thermoplastic machines with auger geometry, the compression ratio of which is 2; 1. Or 3: 1. Experiments carried out on the testing of the proposed thermo-plastic on the D-3328 machine confirm the possibility of its processing on this type of machines provided that the traditional volume of the cylinder of the cylinder is reduced by 2-3 times. The high sensitivity of injection molding phenoplasts to an increase in speeds and shear stresses makes it impossible to process them on a thermoplastic machine that undergoes experience in the processing of these materials. Example 1. In a ball mill load, weight. 1,4-dioxydiphenylsulfone diglycidyl ether powder with an epoxy number of 22.0, 17.64, ED-8 epoxy resin with an epoxy number of 8.1 4.2, phenol formaldehyde on aniline resin SF-3tOA with a particle fraction of up to 1 mm 10.03 , α-oxydiphenylsulfone 0.27, calcium stearate 2.0, recrystallized mountain wax 0.4 mixed and further crushed the components for 2-3 hours. The resulting dry mixture is fed to the hot rolls of the rollers and rolled to form a uniformly distributed on the surface of the cake. The temperature of the idle roll coctabl 105-110 ° C, working VO-EO with. The gap between the rollers is 1.0-1.2 mm. Then the rolls are opened to 1, 8 mm, and load 65,24 weight. crushed fiberglass. The mixing time of the binder with fiberglass is 8-10 mc. After the time of rolling, the cake is removed, cooled, crushed, and the material is scattered to particles of 1-3 mm in size.

Example 2. Components of a binder composition 8, wt., Diglycidyl ether, 4-dioxydiphenylsulfone with an epoxy number of 22.0 17.8, epoxy-diane ED-8 with an epoxy number of 8.0 J, 5, phenol-formaldehyde aniline resin SF-Z OA with a fraction of particles up to 1 mm 10.7, powdered 4, α-dioxydiphenylsulfone 0.57. Calcium stearate 2.5, recrystallized mountain wax 0.5, mixed and crushed in a ball mill of example 1, are rolled on hot rolls with fiberglass in an amount up to 100 weight. Rolling mode is similar to example 1.

Example 3. The mixture of components in the composition, wt.% Powdered

96033 "

4,11-dioxydiphenylsulfone diglycidyl ether with epoxy number 22.0, 18.0, ED-8 epoxy resins with epoxy number 8.1, 58, phenol formaldehyde aniline resin OF-3 «0 with a particle fraction of up to 1 mm 11, 0, powdered, -dirksidiphenylsulfone 0,7 ,. Calcium stearate 3.0 recrystallized mountain wax 0, BO, mixed in a ball mill of example 1, is rolled on hot rollers with crushed fiberglass up to 100 weight D. The rolling mode is the same as example 1.

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Physico-mechanical and technological properties of the material are given in table. 1-3.

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Epoxy resin 185-100 diglycidyl ether dioxydiphenylsulfone 2

Methyl dianhydride of nadic acid 80

Dimethylaminomethylphenol 0.5

Zinc Stearate O, 1

Silicon oxide (weight is equal to the B-stage resin part)

Mountain wax 0,, 60

Fiberglass 65,, 95

Tensile strength

bending

kgf / cm 860.0 880.0 Flexural modulus, J kg, 2-10 1.3-10

table 2

0.12 0.20 0.29 0.37 0.60 0.8

0.08 0.12 0.16 0.20 0.0 0.60

0.10 0.18 0.25 0.33 0.55 0.70

1.20

0.50

Table 3

685.0 6 "3.0692.0

905 SALL 2.5105.7-10 7.5-10 8.040

896033

12

Continued tabl, 3

Claims (2)

Claim An epoxy composition for the manufacture of electrical and structural products containing diglycidyl ether 4.4 ^x -dioxidiphenylsulfone, an epoxy resin, hardener, filler and lubricants, distinguishing 25 s in that, in order to reduce the curing time while maintaining high mechanical strength and thermal stability, as a hardener, the composition contains phenol formalde ₃₀ hydrous aniline resin, as a filler - glass fiber with a length of fibers of 3 ~ 7 ^{mm and} optionally 4,4-dioxidiphenylsulfone in the following ratio of components, 35 weight.-6: Diglycidyl ether 4,4-dioxidiphenylsulfon 17.64-18.00 40 Epoxy resin 4.42-4.58 Phenol formaldehyde aniline resin 10.03-11.40 45 4,4-dioxidiphenylsulfon 0.27-0.47 ' Lubricants 2.40-3.60 . Fiberglass Rest Sources of information, fifty taken into account upon examination 1. Molding technology. Pros Pect Sinrez Almoko, 1977. 2.26 th Αηπιι. Conf. Reinforc Plast Compos Div Proc .. Wastingfon DC 1971, 19s / 1-19s / 18 (προτο ⁵⁵ type). VNIIIPI Order 11622/8 Circulation 511 Subscription Branch of PPP Patent, Uzhhorod, st. Design. 4