RU2613510C1 - Method for manufacture of products from fiberglass with anti-static surface properties - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: decorative and protective coating is prepared - gel coat with addition of a conductive chopped glass fiber roving with fiber length of 0.01-6.0 mm, and aluminium powder. A matrix is prepared by cleansing, degreasing and release agent application. The prepared gel coat is applied, dried. At the same time, while the matrix is dried, a solution is prepared from polyester resins with additives, then the pre-cut fiberglass with gel coat is laid in the dried matrix, forming the product, followed by application of the solution prepared from polyester resins with additives (thickness is 0.1-6.0 mm) which is uniformly distributed within the matrix and dried to form a finished product, which is removed from the matrix and machined.

EFFECT: invention allows to provide the finished product with electrical conductivity, sufficient to drain static currents on the surface layer while increasing strength.

Description

The invention relates to a method for manufacturing composite materials, namely fiberglass and products from them, with an electrically conductive protective and decorative coating of a dielectric base, which can be used in various industries.

The prior art method for the manufacture of products from polyester resins reinforced with glass mat applied to the surface of a prefabricated matrix form (see CN 102675846, publ. 2012-09-19).

The disadvantage of this method is the low conductivity properties of the resulting product.

The objective of the invention is the manufacture of products with improved technical characteristics, such as antistatic properties and flame retardant properties.

The technical result is to give the finished product electrical conductivity properties sufficient to drain static currents on the surface layer with a simultaneous increase in strength.

The technical result is achieved in that the method of manufacturing fiberglass products with antistatic surface properties is characterized by preparing a decorative protective coating - gelcoat with the addition of conductive chopped roving made of glass fiber with a fiber length of 0.01-6 mm and aluminum powder, and preparing the matrix by cleansing, degreasing and applying a release agent, apply the prepared gelcoat by using a paint tool, expose the matrix coated with gelcoat drying, while in parallel with the drying process of the matrix, a solution of polyester resins with one or more additives is prepared, then pre-cut fiberglass is placed in the dried matrix with gelcoat, forming the product, followed by applying the prepared solution of polyester resins with one or more additives with a thickness of 0, 1-6 mm, which is evenly and accurately distributed inside the matrix, dried until the finished product is formed, removed from the matrix and subjected to mechanical processing.

The claimed method includes the following stages.

The first stage is preparatory and consists in preparing a decorative protective coating - gelcoat and preparing a matrix. In this case, the gelcoat can be prepared on a polyester basis.

Moreover, the preparation of gelcoat, in particular, on a polyester basis by adding conductive chopped roving with a fiber length of 0.01-6 mm and aluminum powder to it, provides a reduction in electrical resistance and the acquisition of electrical conductivity for the flow of static currents along the surface layer. Surface resistance <10 ^∧ 9 Ohm (antistatic effect). Also, such an additive is a reinforcing component of gelcoat, which generally affects the increase in strength of the product obtained by the claimed method.

The matrix is prepared as follows. They are cleaned by degreasing with a cotton cloth moistened with an alcohol solution and a release agent, such as release wax, is applied to facilitate removal of the finished products from the tooling.

The second stage is the application of the prepared gelcoat by using a paint tool - hand, pneumatic tool or power tool (rollers, brushes, spray guns, etc.), and the gelcoat is applied in a designated place subject to the following conditions: the room must have good ventilation, sufficient lighting .

The third stage - the matrix with the applied surface layer is dried.

The fourth stage - in parallel with the drying process of the matrix, a solution is prepared from polyester resins with various types of additives. As an additive or additives may be a hardener. Then, pre-cut glass fiber, in particular glass mat, is laid in the dried matrix, forming the product, followed by applying the prepared solution from polyester resins with one or more additives of 0.1-6 mm thickness, which are evenly and accurately distributed inside the matrix.

The fifth stage is drying until the finished product is formed.

The final stage of the claimed method of manufacturing fiberglass products is the removal of parts and machining.

As a result of the use of this invention, it becomes possible to manufacture fiberglass products with improved technical and economic indicators.

In the manufacture of fiberglass products by the claimed method, the following methods can be used:

- the method of manual molding, in which the gelcoat forms the outer side of the product’s parts, setting the necessary color and performing protective functions from external factors (ultraviolet, water, chemicals, etc.). The dried form with the gelcoat located in it is then filled with fiberglass, followed by the application of polyester resin using rollers (brushes) and further molding of the part;

- the method of vacuum infusion, in which due to the hermetic film adjacent to the matrix, a working cavity is created with the reinforcing material laid (vacuum bag). A vacuum is created in the cavity, and due to this vacuum, the binder (polyester resin) is drawn into the working cavity and impregnates the reinforcing material;

- a method of spraying chopped roving, in which glass fiber cut into small fibers, mixed with polyester resin and other substances and resulting in gelcoat, is applied to the matrix, evenly distributed and hardened with a tool;

- wet forming method, in which glass mat is placed in a pre-prepared and colored part of the matrix, which is then poured with a certain amount of resin, closing with another part of the matrix, thereby sealing the filling;

- Light RTM method, in which a dry, pre-cut glass material is placed between the die and the punch. Then, using special equipment, a mixture of polyester resin-hardener is injected into a closed matrix under pressure (or vacuum).

After curing, the finished fiberglass product is removed from the mold and subjected to machining, if necessary.

Claims (1)

A method of manufacturing fiberglass products with antistatic surface properties, characterized in that a decorative protective coating is prepared - gelcoat with the addition of conductive chopped glass roving with a fiber length of 0.01-6 mm and aluminum powder, the matrix is prepared by cleaning, degreasing and applying it the separating composition, the prepared gelcoat is applied by using a paint tool, the gelcoat coated matrix is dried, while in parallel with the process of the matrix drying, prepare a solution of polyester resins with one or more additives, then pre-cut fiberglass is placed in the dried matrix with gelcoat, forming a product, followed by applying the prepared solution of polyester resins with one or more additives with a thickness of 0.1-6 mm, which is uniform and carefully distributed inside the matrix, dried to form the finished product, removed from the matrix and subjected to mechanical processing.