Method to manufacture fibre glass items with low value of surface electric resistance

FIELD: construction.

SUBSTANCE: in method realisation they clean a die of a future item, degrease it with subsequent application of separating wax and then a protective-finishing layer is applied - gel coat, with addition of current-conducting hydrocarbon fibres. Drying is carried out with subsequent hand moulding. Cut material is laid into the die, forming the item, then resin mixed with catalyst is applied, afterwards using brushes and/or soft rollers they evenly distribute the mixture along the die. The produced laminate is rolled with a stiff roller with its subsequent withdrawal from the mould and exposed to mechanical treatment.

EFFECT: production of items with low value of surface electric resistance and higher strength.

 

The invention relates to methods for producing fiberglass products.

The prior art document EN 2430830 C1, CL VV 11/00, publ. 10.10.2011, which describes a method of manufacturing products using polyester resin, reinforced with glass Mat markings on the surface of pre-manufactured forms-matrix and accurately repeating its shape.

However, in the known method is not disclosed method of manufacture of fiberglass products with low value of the surface electric resistance.

The technical result of the described invention is the possibility of obtaining fiberglass products with low surface electrical resistance and increased strength.

The technical result is achieved by a method of manufacturing fiberglass products, which carry out the cleaning of the matrix of future products, degrease it with cotton material, and soaked in alcohol solution, followed by the application of the separation of wax and put a protective and decorative layer of gelcoat with the addition of fine conductive carbon fiber. Then hold drying with subsequent manual molding, in a matrix stack cut the material forming the product, then apply the resin mixed with a curing catalyst, after which the brushes and/or soft shaft is kami evenly distribute the mixture over the matrix, then the resulting laminate is rolled the hard roller, followed by removing it from the mold and subjected to a machining process.

The thickness of the fiber used from 10 to 100 μm, a length of 0.8-5 cm Fiber added to the gelcoat, are in it randomly. As such fibers may be used filament carbon structural Chis-5000 (GOST 28008-88) or Chis-M-6K.

Specified in this invention the technical result is achieved in the case of the use of any of the resin materials for the reinforcement and hardening catalysts, because the effect of reducing the electric resistance is achieved by adding carbon fiber to the gelcoat. The use of this invention only on the surface of the fiberglass products reduced electrical resistance, and it becomes conductivity.

The method of manufacture of fiberglass products in this case takes place by the method of hand molding.

The procedure of manufacturing fiberglass products manual molding takes place in several stages. The first preparatory stage: the surface of the matrix of the future product used for cleaning, degreasing and cause separation of the wax. Then the matrix is covered with a protective and decorative layer of gelcoat. Gelcoat forms the outer surface of the future product, specifying a color and providing protection is on external factors (UV, water, chemicals etc). When you add in the extremely thin conductive carbon fiber black color, the product receives a characteristic color. Since the thickness of the gelcoat does not exceed one millimeter, carbon fiber visible on the surface of the product. Involved in the gelcoat carbon fiber chaotically intertwined inside and make the surface of the product is similar to alight with short strokes of paper.

After drying, the gel is transferred to the next stage - forming. The matrix is laid precut teklemariam or another type of reinforcing filler, forming a "skeleton" of the future product. Then prepared teklemariam is applied to a resin, previously prepared and mixed with the catalyst. The resin is uniformly distributed through the matrix using brushes and soft cushions.

The final stage - compacting. Removal of the uncured laminate of air bubbles, which can affect the quality of the finished product, the laminate is rolled the hard roller. After curing, the finished product is removed from the mold and subjected to machining: trim the excess fiberglass around the edges, drilling holes, etc.

It also provides a method of manufacturing fiberglass products, which takes place by spraying. This process is the implementation of what is in stages:

- applying gelcoat;

- the application of resin and chopsaw (cups chopped roving);

seal fiberglass in the matrix.

Applying gelcoat and fiberglass is carried out using special equipment. In this method it is necessary to observe the following features:

- Sprayed should use continuous and parallel strips, overlapping by 20%, with constant velocity.

- Sprayed in two or three passes to get the desired film thickness.

Is always to spray the next layer perpendicular to the previous one.

- To stop the spray gun outside of the mold.

For hard to reach places the form in which it is impossible to maintain the correct position of spray guns for applying a layer can be used a brush.

- You also need to check the thickness of the wet film, which should be 0.5-1.0 mm depending on the destination reinforced plastic products.

Applying the gelcoat should be done in the spraying cabin or on a separate platform working shop

with effective ventilation;

with good lighting;

- in the absence of dust;

- at a temperature of 18-25 degrees;

- at a humidity of 80% (max).

For the application of gel coat and resin are used, the spray guns series RS, these pistols have a platform for nutrunner and external mixing, and also for installation of the chopper. Chopper is mounted directly on the gun and is designed for cutting fiber added to the mixture. The chopper uses a rotating torque pneumatic motor for cutting fiber added to the mixture. In the chopper creates this air flow, which enables you to work at low temperatures and provides better performance when working with fiber.

The equipment for manufacture of fiberglass-coated automatically performs hard batch of polyester resin and catalyst, chopping roving (a bundle of strands of continuous glass fibre) into pieces of a given size (copsy, length 0.8-5 cm). After cutting part of the fiberglass fall in a stream of polyester resin from the spray gun and absorb it during the transfer matrix. The share of manual labor remains the seal fiberglass in the matrix stitcher roller.

In the described process for the production of fiberglass products by spraying is also done adding conductive carbon fibers of a thickness of from 15 to 100 microns in thickness. As a result, the surface of the product, as in the previous case, has a characteristic color, similar to the circle touches the paper. This effect arises from the fact that added to the gelcoat black carbon chaotic Kil the military fibers are visible on the surface.

Low surface resistance allows you to avoid the accumulation of static electric charge on the surface of the product and cause sparks that can ignite explosive gases and mixtures that may be present in the ambient atmosphere. Fiberglass products with a low surface electric resistance can be used in industrial or household in the presence of an ambient atmosphere of a mixture of explosive gases. The quality of the products allows them to be certified for explosion protection. Presents the technological process can be applied in various ways in the manufacture of fiberglass products, which are known from the previous level of technology development.

A method of manufacturing fiberglass products, characterized by the fact that carry out cleaning of the matrix of future products, degrease it with cotton soaked in alcohol solution, followed by the application of the separation of wax and put a protective and decorative layer of gelcoat with the addition of conductive carbon fiber, are drying with subsequent manual molding, in a matrix stack cut the material forming the product, then apply the resin mixed with catalyst, after which the brushes and/or soft rollers evenly RA is predelay mixture according to the matrix, then the resulting laminate is rolled the hard roller, followed by removing it from the mold and subjected to machining.



 

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