JPH04329121A - Surface treatment method of fiber reinforced phenolic resin molded body - Google Patents

Abstract

PURPOSE:To provide a manufacture where in case of manufacturing of a fiber- reinforced phenolic resin molded body, it is moldable into a product having a smooth surface already at a manufacturing stage. CONSTITUTION:In a method making a phenolic resin impregnated continuous reinforcement material fed to a pultrusion mold into a cured body by heating the same while molding, it is constituted of a process where glass fiber mats 4, 4 which are impregnated with high-molecular-weight phenolic resin 3, 3 are laminated to the top and bottom of a roving 2 which is impregnated with low- molecular weight phenolic resin 1, the laminated body 5 is fed to a pultrusion mold 6, heated while molding and made into a cured body, through which generation of a viod is prevented by a surface layer which is cured in advance.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a method for surface treatment of fiber-reinforced phenolic resin molded articles.

0002

BACKGROUND OF THE INVENTION Conventionally, fiber-reinforced resin building materials containing phenolic resin as a main component have been widely used as noncombustible building materials. This fiber-reinforced resin building material, whose main component is phenolic resin, has the advantages of being much lighter than inorganic board materials whose main components are cement, etc., which are also well-known as non-combustible building materials, and have excellent heat insulation properties. It is widely used as a molding material for interior decoration boards, etc. In addition, the strength of the fiber-reinforced resin building materials whose main component is phenolic resin is very low if they consist only of the resin component, and they cannot be used as building materials. Therefore, it is not possible to use glass fiber roving, mats, etc. be exposed.

By the way, when molding the above-mentioned fiber-reinforced resin molded article, as shown in FIG.
roving B and mat C are passed through and impregnated with resin,
The resin-impregnated reinforcing bodies B and C were bundled and supplied to a pultrusion mold D.

0004

[Problems with the prior art] However, in the case of the above manufacturing method, the surface part of the product undergoes a curing reaction first in the mold D, and the internal curing reaction tends to be delayed, so that an internal reaction occurs. The disadvantage is that the condensed water that is generated when exposed to water becomes a gas and blows out onto the surface, creating voids and deteriorating the surface condition.

[0005] In order to solve these problems, the surface of the molded fiber-reinforced resin foam board is painted or a decorative film or sheet is laminated and adhered, but the surface of the adhesive base is Since it is not homogeneous, it has poor adhesion to paints or films, and it always requires pre-treatment such as smoothing treatment, making it very time-consuming to make it into a product.

[0006]

[Problems to be Solved by the Invention] In view of the above-mentioned problems, the present invention provides the following steps when producing a fiber-reinforced phenolic resin molded article:
This was done for the purpose of providing a manufacturing method that can form a product with a smooth surface already at the manufacturing stage.

[0007]

[Means for Solving the Problems] That is, the method for surface treatment of a fiber-reinforced phenolic resin molded article of the present invention involves supplying a continuous reinforcing body impregnated with a phenolic resin to a drawing die, heating it while molding it, and curing it into a hardened body. In the method, glass fiber mats impregnated with a high molecular weight phenolic resin are laminated on the upper and lower surfaces of a roving impregnated with a low molecular weight phenolic resin,
This method is characterized in that the laminate is supplied to a drawing die and heated while being molded to form a cured product.

[0008]

[Example] Next, an example of the present invention will be described. FIG. 1 is a side sectional view showing the state of implementation of the invention. The method for surface treatment of a fiber-reinforced phenolic resin molded article of the present invention is a method in which a continuous reinforcing body impregnated with a phenolic resin is supplied to a drawing mold and heated while being molded to form a hardened body. Glass fiber mats 4 impregnated with high-molecular weight phenolic resins 3 and 3 are laminated on the upper and lower surfaces of the roving 2, and this laminate 5 is supplied to a drawing die 6 and heated while being molded to form a cured product. It is.

[0009] In the above, the same mold as the conventional one is used as the drawing mold. In addition, the molecular weight of phenolic resins is such that by the time the resin located in the center generates condensed water, the resin located on the surface has already completed the curing reaction. used.

0010

[Function] In this invention, when a fiber-reinforced phenolic resin molded article is pultruded, the glass fiber mats 4, 4 forming the surface layer react quickly because the resin contained therein has a high molecular weight, and The roving 2, which forms the center of the molded body, hardens at a rapid rate by heating at
Since the resin contained in the resin has a low molecular weight, the reaction is slow, so by the time the resin in the center undergoes a curing reaction and generates condensed water, the surface layer has already finished curing, which is the cause of voids. This prevents gas from blowing out.

[0011]

[Effects of the Invention] As explained above, this invention creates a time difference in the curing time of the molded product that is hardened in the mold between the surface area and the center area, so that the protrusion of gas that causes voids occurs first. This is hindered by the hardening surface layer, making it possible to easily obtain smooth molded products.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a state in which the invention is implemented.

FIG. 2 is an explanatory diagram of a conventional example.

[Explanation of symbols]

1. Low molecular weight phenolic resin 2 Roving 3. High molecular weight phenolic resin 4 Glass fiber mat 5 Laminated body 6 Drawing mold

Claims (1)

[Claims] Claim 1: A method in which a continuous reinforcing body impregnated with a phenolic resin is supplied to a drawing mold and heated while being molded to form a hardened body, in which the upper and lower surfaces of the roving impregnated with a low molecular weight phenolic resin are coated with high molecular weight phenol. A method for surface treatment of a fiber-reinforced phenol resin molded article, which comprises laminating resin-impregnated glass fiber mats, supplying the laminated body to a drawing mold, and heating the laminated body while molding it to form a cured body.