RU2522000C1 - Method for lap splicing components made of fibre-glass - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: in the method for lap splicing components made of fibre-glass by applying an adhesive on the surfaces to be glued and contacting the surfaces, an adhesive based on a solution of chlorinated polyvinylchloride resin CPVC in an organic solvent is applied twice. The solvent is a mixture of butyl acetate and acetone in ratio of 1:1. Further, the method includes adding a modifier of a phosphorus-, boron- and nitrogen-containing oligomer, which is obtained in advance by reacting methyl phosphite borate, epoxy resin ED-20 and aniline in weight ratio 2.5:1:2.5, in amount of 0.1-10.0 pts.wt per 100 pts.wt adhesive. The adhesive film is dried at room temperature - the first layer for 10 minutes and the second layer for 1 minute.

EFFECT: invention simplifies the method of gluing components made of fibre-glass and increases the strength of lap splicing fibre-glass.

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Description

The invention relates to a technology for bonding structural materials and can be used in various industries for bonding fiberglass parts to each other.

A known method of bonding various materials with adhesives based on epoxy resins with hardeners using radiation treatment of the cured adhesive, which are additionally introduced plasticizer. (USSR author's certificate No. 2148593, class C69J 5/00; publ. 10.05.00).

However, this method requires subjecting the parts to be glued to radiation in moderate doses, which complicates the bonding process.

There is a method of bonding and sealing rubbers by applying oligoester acrylates with the addition of a polymerization initiator followed by contacting the surfaces under anaerobic conditions on the bonded surfaces of the adhesive material (USSR Author's Certificate No. 378402, class C09J 5/00; Published on April 18, 73).

However, this method is intended for bonding rubbers, while bonding occurs under anaerobic conditions, which complicates bonding.

A known method of bonding parts of metal, glass and plastic with glue based on a 30% solution of a copolymer of vinylidene fluoride with trifluorochlorethylene. The application and drying of the adhesive layer is repeated 1-3 times. Drying is carried out at 110-130 ° C, and heat treatment is carried out at 280-320 ° C for 30-50 minutes (USSR Author's Certificate No. 1331034, C09J 5/06; Publ. 20.10.95).

However, the bonding technology is complex and multi-stage, it requires exposure to a strictly defined temperature regime.

A known method of attaching rubbers to each other and linoleum, which consists in the fact that glue based on CPVC brand perchlorovinyl resin, an organic solvent, is applied to the surfaces to be bonded, followed by contacting the surfaces. Before application, dibutyl phthalate and modifiers, which are an ED-20 epoxy resin and N-nitrosodiphenylamine, are additionally introduced into the adhesive composition. The technology for gluing samples involves applying the prepared adhesive twice to the prepared surface, drying the adhesive film at room temperature (20 ° C) - the first layer for 10 minutes, the second layer for 1 minute, after which the glued surfaces are pressed tightly. Contacting of glued surfaces is carried out under load for 24 hours. (Patent No. 2435820, class C09J 175/04, 109/02, C08L 19/00; Publ. 10.12.11).

However, this method is intended for bonding rubbers between themselves and linoleum, and the adhesive composition has a more complex composition.

The closest is a method of securing fiberglass overlap of cylindrical parts by applying a polymer adhesive containing 7-10 vol.% Granules of expandable polystyrene onto surfaces to be glued, contacting surfaces and heating under pressure, characterized in that, in order to increase the shear strength of adhesion, glued surfaces before applying glue introduce needle-shaped reinforcement (Copyright certificate No. 1306096, Russia, С09J 5/02; Publ. 10.01.2000).

However, this bonding method is complex and requires additional conditions - heating of the contact surfaces under pressure.

Objective: the development of a method for bonding fiberglass lap parts, providing increased strength.

The technical result is to simplify the method of bonding fiberglass parts and increase the strength when bonding fiberglass overlap.

The technical result is achieved by the fact that by the method of bonding fiberglass parts by lapping by applying glue to the glued surfaces and contacting the surfaces, moreover, the adhesive is applied twice based on a solution of CPVC perchlorovinyl resin in an organic solvent, which is a 1: 1 mixture of butyl acetate and acetone, followed by the addition of a modifier, a phosphorus-borazo-containing oligomer, previously obtained as a result of the interaction of methylphosphite borate, epoxy resin E D-20 and aniline in a mass ratio of 2.5: 1: 2.5, in an amount of 0.1-10.0 wt.h. per 100 parts by weight glue, dry the adhesive film at room temperature - the first layer for 10 minutes, the second for 1 minute.

CPVC brand perchlorvinyl resin (OST 6-01-37-88, amendment 1, 2) is used in the production of adhesives, coatings as a polymer binder.

Organic solvent: a mixture of butyl acetate (GOST 8981-78) and acetone (GOST 2603-79).

As a modifier to increase the adhesion of the glue, a phosphorus-borazo-containing oligomer (FEDA) is used, previously obtained as a result of the interaction of methylphosphite borate, ED-20 epoxy and aniline in a mass ratio of 2.5: 1: 2.5. Methyl phosphite borate was previously used for flame retardant modification of cellulosic materials (RF Patent No. 224341 C1, C08B 15/05, Publ. 20.06.05). To prepare the FEDA, the required amount of ED-20 epoxy and aniline are loaded into the mixer, mixed until a homogeneous mass is obtained. Then, the calculated amount of methylphosphite borate is slowly added dropwise, preventing the reaction mass from heating above 25 ° C. The synthesis is carried out with constant stirring. FEDA preparation time is 2.5 - 3 hours. Some physical properties of the oligomer are presented in table 1.

Table 1 Physical properties Value Relative density, g / cm ³ 1.4914-1.5478 Refractive index 1,461-1,496

As a result of the introduction of a phosphorus-borazo-containing oligomer into the adhesive composition, an increase in the concentration of polar groups and the formation of additional chemical bonds, which increases the strength when bonding fiberglass to each other.

The stated limits of the content of the FEDA modifier are due to the fact that when their number is reduced, it is not possible to obtain high values of adhesion, and a further increase in dosages does not lead to an increase in adhesion, and the curing time of the adhesive joint increases.

The method of bonding fiberglass to each other is as follows.

Before applying to the CPVC perchlorovinyl resin adhesive, before applying to the surfaces to be bonded, the calculated amount of the FEDA modifier is introduced and the contents are mixed for 3-5 minutes until completely dissolved. Twice applying the prepared adhesive to the prepared surface, drying the adhesive film at room temperature (20 ° C) for 10 minutes after the first layer and 1-2 minutes after applying the second layer, after which the glued surfaces are pressed tightly and contacted under a load of 2 kg within 24 hours.

Shear adhesion was determined using an MPC-250 tensile testing machine (RTM 1.2.126-88). Various contents of the FEDA modifier were investigated (Table 2).

The method is illustrated by the following example.

A calculated amount of a phosphorus-boron-containing oligomer is introduced into an adhesive mixer containing a solution of perchlorovinyl resin in a mixture of organic solvents and the contents are mixed for 3-5 minutes until a homogeneous mass is obtained.

The technology for bonding fiberglass samples is as follows: applying the prepared adhesive twice to the prepared surface, drying the adhesive film at room temperature (20 ° C) for 10 minutes after the first layer and 1-2 minutes after applying the second layer, after which the glued surfaces are pressed tightly and contacting under a load of 2 kg for 24 hours. After that, the shear strength is determined.

As can be seen from table 2, the proposed method for bonding fiberglass to each other provides high strength properties of adhesive joints. Thus, the shear strength of an adhesive joint when gluing fiberglass with an adhesive composition without modifiers (control example) is 0.72 MPa, and with the use of the proposed modifiers it reaches 2.94 MPa.

table 2 The content of the FEDA modifier, parts by weight per 100 parts by weight glue Shear Strength, MPa Test case 0.72 0.1 0.86 0.5 1.47 1,0 1.23 1,5 1.55 2,5 2.94 5,0 1.87 7.5 1.87 10.0 0.76

The technical and economic effect obtained from the use of the adhesive composition is that its use can significantly increase the strength of the connection of fiberglass products to each other.

Claims (1)

A method of gluing parts from fiberglass lap by applying glue to the glued surface and contacting the surfaces, characterized in that the glue is applied twice based on a solution of CPVC perchlorovinyl resin in an organic solvent, which is a mixture of butyl acetate and acetone in a ratio of 1: 1, followed by the addition of a modifier - phosphorus-boron-containing oligomer, previously obtained as a result of the interaction of methyl phosphite borate, ED-20 epoxy and aniline in a mass ratio of 2.5: 1: 2.5, in 0.1-10.0 parts by weight per 100 parts by weight glue, dry the adhesive film at room temperature - the first layer for 10 minutes, the second for 1 minute.