SU718291A1 - Method of manufacturing a laminated cellular panel - Google Patents

Description

The invention relates to the field of production of composite materials and can be used in the manufacture of panels and shells of various curvatures used in aviation, shipbuilding and 5 ground construction.

A known method of manufacturing laminated panels, including the impregnation of fiberglass with an epoxyphenolic binder, drying the fiberglass to tack, applying an adhesive 10 based on an epoxyphenolic binder to the contact surface of the filler with the casing, laying the filler between the casing, vacuum pressing the package at a binder curing temperature of 15 binder [1] .

This method has disadvantages.

The moldings are formed when the entire panel package is cured under pressure, which is transferred to the panels with simultaneous heating of the package to the polymerization temperature of the binder. The uncured glass fabric of the skin when heated and pressure is easily amenable to deformation under the action of the ribs of the cellular filler 25, which causes heterogeneity of the density of the structure of the skin in the zones located between and under the ribs of the cellular aggregate. A sufficiently dense material is obtained under the edge of the cellular filler, while the material of the skin between the ribs is loose, which facilitates the penetration of moisture into the delamination of the skin and reduces the physicomechanical characteristics of the panel. The outer surfaces of the laminated panel have some death inside the cells due to dips in uncured tissue. Deformed cladding requires additional primer.

In addition, a significant drawback is the increased consumption of the adhesive compound, which is applied to the inner surface of the skin and protrusions of the cellular aggregate, which significantly increases the weight of the laminated panel.

The aim of the invention is to reduce weight, increase the tensile stress at shear and improve the quality of the connection of the filler with the skin.

This goal is achieved in that a method of manufacturing a laminated cellular panel, comprising impregnating the glass fabric with an epoxy phenolic binder, drying the glass fabric before tack, applying an adhesive composition based on an epoxy phenolic binder to the contact surface of the filler with the casing, laying the filler between the casing, vacuum pressing the package at a curing temperature of the binder also includes the fact that one or more filter layers of one and more filtering layers are laid on the glass cloth impregnated and dried at a temperature of 90-100 ° C. ropitannoy egyuksifenolnym cured binder and 10-30% glass fiber and a contact layer of dry fiberglass and the collected skin is cured for 3-4 hours at a temperature of 150-170 ° C and a pressure of 0.3-0.5 kg / cm ^2.

Example 1. A laminated honeycomb panel is made up of separately molded skin and a honeycomb core.

Sheathing is made of three layers of fiberglass T-10, impregnated with a binder compound EFB 32-301, guess which one layer of fiberglass T-10, impregnated with binder EFB 32-301 and partially polymerized in an oven at 100 ^C for 10 minutes, and one layer of dry fiberglass T-10. The plating thus prepared is cured for 4 hours at a polymerization temperature of 160 ° C. and a pressure of 0.4 kg / cm ² . After curing, the casing is cooled without pressure relief. An EFB 32-301 binder compound is applied to the surface of the dry fiberglass of the cured casing, and a 8.5 mm high honeycomb core is placed between the casing, the contact surface of which with the casing is pre-coated with an EFB 32-301 binder. The assembled laminated cellular panel is placed on a vacuum table and polymerized at a temperature of 160 ° C and a pressure of 0.4 kg / cm ² for 4 hours

Example 2. A laminated honeycomb panel is made up of separately molded skin and a honeycomb core according to known technology based on the components of Example 1.

The table shows the comparative characteristics of the samples obtained in examples 1 and 2.

Tests show that samples of three-layer panels manufactured by the proposed technology have a large (1.44 times) shear stress at shear, less weight (by

The name of indicators Examples 1 2 Weight 1 m ^{and a} three-layer panel, kg 3.60 4.10 Destructive shear stress, kgf / cm ² 9.73 6.83

Editor G. Prusova

0.5 kg / m ² ) and a high density of the structure of the skin, eliminating delamination and deformation; the consumption of the adhesive compound without reducing the bond strength of the aggregate with the skin is minimal.

Claims (2)

iiyio and fiberglass, dried at a temperature of 90-100 ° C, place one or more filter layers of impregnated epoxy-phenolic binder and glass fiber cured with 10-30% and one contact layer of dry fiberglass and the collected glass is cured for 3-4 hours at a temperature of 150- 170 ° C and a pressure of 0.3-0.5 kg / cm. Example 1. A layered honeycomb panel is made up of separately molded panels and a honeycomb. T-10 fiberglass impregnated with an EFB 32-301 binder compound are made into common layers, with a single layer of T-10 fiberglass impregnated with an EFB 32-301 binder and partially polymerized in a natural fabric at a temperature of 10 minutes, and one layer of dry T-10 fiberglass. The common materials prepared in this way are cured for 4 hours at a polymerization temperature of 160 ° C and a pressure of 0.4 kg / cm. After curing, the skin is cooled without relieving pressure. An EFB 32-301 binder compound is applied to the surface of dry fiberglass with hardened skins and a 8.5 mm high cellular aggregate is placed between the skins, the contact surface of which with the skins is pre-coated with an EFB 32-301 binder. The assembled layered honeycomb panel is placed on a vacuum table and polymerized at a temperature of 160 ° C and a pressure of 0.4 kg / cm for 4 hours. Example 2. A layered honeycomb panel consisting of separately molded skins and a cellular filler using a known technology is made. components of example 1. The table shows the comparative characteristics of the samples obtained in examples 1 and 2. Tests show that samples of three-layer panels manufactured according to the proposed technology have a large (1.44 times) breaking stress during shear, a lower weight (by 0.5 kg / m) and a high density of total structure, eliminating delamination and deformation; Consumption of the adhesive compound without reducing the strength of the joint between the filler and linings is minimal. The invention The method of manufacturing a layered cellular panel, including the impregnation of glass fiber with an epoxy phenolic binder, the glass fabric dyeing splicing, the application of adhesive based on the epoxy phenolic bond composition la surface of the filling sheet with curl, laying the filler between the sheaths, vacuum pressing of the bag at the temperature of the hardening in order to reduce the weight of the panel, increase the destructive stress during shear and improve: 1 and the quality of the connection of the filler with at the temperature of 90-100 ° C, one or more filter layers of impregnated epoxy-phenolic binder and hardened on 10-30 / o glass fiber and one contact glass fabric and collected from the lining with; It takes 3-4 hours at a temperature of 150–170 ° C and a pressure of 0.3 kg of 0.5 kg / Sources of information taken into account in the examination of esudsky VE, Krysin V.I., Les1. I. Be. Technologists of cellular manufacturing C. other designs. M., “Machinoaviation, 1975, p. 130-134. build