JPH0242403A - Manufacture of mirror made of solid molding of glass and resin and solid molding of glass resin - Google Patents

Abstract

PURPOSE:To ensure the flatness of a mirror face for a long period and to select a form freely by leaving the mirror face of a glass mirror, covering and molding solidly the other part with fiber reinforced resin. CONSTITUTION:A glass member 3 and a pressing member 4 are placed on a lower mold 2, an upper mold 1 is closed and a forming mold cavity 5 is formed by the upper mold and the lower mold. A resin 7 is injected from a resin injecting opening 6, the glass member 3, the pressing member 4 and the resin 7 are united, it is taken off from the mold and the solid molding of the glass and the resin is obtained. Thus, the mirror face having the stable flatness without warpage, distortion, etc., can be obtained and the solid molding of the glass member and the resin excellent in dimensional accuracy can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a mirror made of an integrally molded product of glass and resin, and a method for manufacturing the integrally molded product of glass and resin.

[Prior Art] Conventionally, glass members such as mirrors used in office equipment such as copying machines need to be integrated with resin molded parts in order to be incorporated into the office equipment.

Conventionally known methods for this integration include using adhesives and surrounding the glass member with metal and fastening the metal and the resin molded member with screws.

[Problems to be solved by the invention] In methods using adhesives, there are problems with poor appearance due to adhesive protrusion and peeling due to deterioration of the adhesive, and in methods using screws, there are many parts. It has problems such as being unsuitable for mass production and making it difficult to ensure the flatness of glass members such as mirrors over a long period of time.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and includes leaving a part or all of the mirror surface of a glass mirror and integrally covering the other parts with fiber reinforced resin. A mirror and a glass member made of an integrally molded product of glass and resin, and a pressing member disposed between the mirror and the inner surface of the mold are arranged in the mold,
The mold is clamped and the glass member is pressed and fixed via the pressing member, and a cavity is formed between the glass member, the pressing member, and the inner surface of the mold, and a resin is injected into this cavity to secure the glass member. , relates to a method of manufacturing an integrally molded product of glass and resin, characterized in that a pressing member and a resin are integrally molded. The integrally molded product of the glass mirror and resin of the present invention has advantages such as being able to maintain the flatness of the mirror surface for a long period of time, and also being able to freely select a shape that can be easily incorporated into office equipment, etc. . In addition, in the method of manufacturing an integrally molded product of glass and resin of the present invention, the glass member moves due to the flow pressure of the resin during conventional molding, and it is thought that it is difficult to integrally mold the resin and glass member. By pressing and fixing the glass member inside the mold cavity through a pressing member, it is now possible to integrally mold the glass member in the mold cavity.

The present invention will be explained with reference to FIGS. 1 to 6, which show typical examples of the manufacturing method of the present invention. 1 to 6 are cross-sectional views of the mold showing the glass member and pressing member inside the mold cavity. In FIG. 1, a glass member 3 and a pressing member 4 are placed on a lower mold 2, the upper mold 1 is closed, a mold cavity 5 is formed with the upper mold and the lower mold, and then a resin 7 is inserted through a resin injection port 6. is injected to integrate the glass member 3, pressing member 4 and resin 7,
The mold is removed to obtain an integral molded product of glass and resin.

The pressing member 4 is used to press the glass member 3 in the cavity using mold clamping pressure so that the glass member 3 in the cavity does not move due to the flow pressure when the resin is injected. If the thickness of the pressing member is too thick and the sum of its thickness and the thickness of the glass member is greater than the depth of the cavity after mold clamping, the glass member may be damaged by the mold clamping pressure, and the sum of the thickness If the depth is smaller than the above-mentioned depth, the glass member will not have enough pressing force to withstand the flow pressure of the resin, so it is important to select an optimal thickness for the pressing member. The material of the pressing member having the optimum thickness is not limited in any way;
All kinds of materials such as metal, ceramics, rubber, plastics, and wood can be used.

Even if the thickness of the pressing member is too thick, if the material of the pressing member can be plastically or elastically deformed under mold clamping pressure of, for example, 100 to 200 g/cm, the excess thickness can be absorbed by deforming. It is advantageous because it can be integrally molded without damaging the glass member.Such materials include:
It can be widely adopted from metals, ceramics, rubber, plastics, etc., but the temperature inside the mold is 100-200℃.
Preferably, it does not deform at ℃. For example, among metals, aluminum has a relatively low yield stress, alloys of aluminum with copper, magnesium, silicon, iron, manganese, zinc, nickel, titanium, etc., or nickel, nickel with copper, chromium, iron, etc. Examples include alloys of

One or more pressing members 4 may be used depending on the shape of the glass member 3, and pressing members having different thicknesses may be used depending on the distance from the mold surface to the glass member. As a method of pressing and fixing a glass member through a pressing member,
In addition to the case where the pressing member is provided only on one side of the glass member as shown in FIG. 1, it is also possible to have the pressing member on both sides of the glass member in the mold clamping pressure direction as shown in FIG.

Figure 2 shows an example in which a mold support rod 8 is adopted that allows easy replacement of only the portion where the pressing member 4 contacts the mold, and the portion of the mold that the pressing member contacts wears out due to continuous molding. You can easily replace it with a new one. One mold support rod may be applied to one pressing member, or one mold support rod may be applied to all of the plurality of pressing members.

The mold support rod usually moves together with the surrounding mold, but by making the support rod movable, it is possible to finely adjust the mold clamping pressure to withstand resin flow pressure without damaging the glass member. can be done.

FIG. 3 shows a support bin 9 integrated with the mold in addition to the pressing member 4.
This is an example of a case where the pressure member is used, and it is useful in the event that the pressure member alone cannot withstand the resin flow pressure. The support bottles 9 may be placed at the four corners of the glass member 3, and these bottle portions remain as four parts of the integrally molded glass and resin product.

FIG. 4 shows an example in which there is a wrap-around portion 10 of the resin so that the glass member 3 does not fall off from the resin 7 after integral molding. If the glass member is sufficiently thick, it can also be prevented from falling off by forming it into an undercut shape as shown in 3 in Figures 1-3.

FIG. 5 shows how to prevent the glass member from falling off when the thickness of the glass member 3 is thin, for example less than I0 mm, and it is not possible to form it into an undercut shape. This figure shows an example in which there is a protrusion 11 that is similar to that shown in FIG. The protrusion 11 may be integrally molded of the same material as the glass member 3, or may be pre-molded of metal, plastic, or the like and fixed with an adhesive or the like. For bonding metal and glass members, an alloy-based adhesive consisting of lead, tin, zinc, etc. is preferable.

FIG. 6 shows an example in which the glass member 3 is not in direct contact with the bottom of the lower mold 2, unlike FIGS. 1 to 5. The part of the glass member 3 that is in direct contact with the mold becomes the exposed part of the glass member after integral molding, and in FIG. For example, it can be an integrally molded product made of a glass member through which light passes. The molded product is molded in such a way that the direction of light transmission and the direction of mold clamping pressure are applied.
That is, if the glass member is molded so as to be in direct contact with the lower part of the upper mold 1 and the bottom of the lower mold 2, the glass member will be damaged and cannot be molded. To avoid damaging the glass components,
If the mold clamping pressure is loosened, the resin will flow around to the surface of the glass member that is in direct contact with the surface of the mold, and the glass member will move due to the flow pressure of the resin, making molding impossible.

According to the method of the present invention, the glass member will not be damaged by mold clamping pressure, but if the surface of the glass member that is in direct contact with the mold is likely to be damaged by the influence of the mold, the surface may be pre-treated with fluorine resin. It is preferable to form a film of a heat-resistant resin such as or PPS resin, or apply a tape made of these resins, and then remove the film or tape after molding.

In addition, if powder paint is applied to the glass surface or the mold surface in contact with the glass surface, the paint will be transferred to the glass surface.
It can also be colored glass.

Examples of integrally molded products of glass and resin that can be molded according to the method of the present invention include all kinds of products that utilize the transmission or reflection of light through glass, such as copying machines, fax machines, barcode readers, etc. These include optical parts for equipment, window members and decorative members for transportation equipment, room mirrors and fender mirrors, and various mirror products used indoors and outdoors. In addition to normal inorganic glass, we also use methacrylic, styrene, vinyl chloride, ester, carbonate, celluloid, and other materials that are easily damaged by mold clamping pressure that come into direct contact with them.
Organic glass such as cellulose resin. As a mirror,
In addition to being made of glass, it may also be made of various metal plates with Cr, AI, etc. deposited on them.

As the resin injected into the cavity, the following various synthetic resins can be used. That is, thermoplastic polyester resins represented by polybutylene terephthalate resin and polyethylene terephthalate resin, copolymers and mixtures of polyester resins and other resins, polymer alloys,
Modified polyester resins and polyphenylene sulfide resins, polyamide resins, polyimide resins, polyetherimide resins, polypropylene resins, AS resins, AB
S resin, polycarbonate resin, polyallylsulfone resin, polysulfone resin, polyacetal resin, polyallylsulfone resin, polyethylene resin, polyvinyl chloride resin, polyether ether ketone resin, fluororesin, polyphenylene oxide resin, (meth)acrylic resin, Various thermoplastic resins such as thermoplastic polyurethane resin, phenolic resin, unsaturated polyester resin,
These are thermosetting resins such as furan resin, alkyd resin, allyl resin, melamine resin, silicone resin, thermosetting polyurethane resin, vinyl ester resin, and urea resin.
These resins are preferably fiber-reinforced resins in which the following reinforcing fibers are mixed, since strength and heat resistance are increased.

In other words, glass fiber, carbon fiber, boron fiber, fused silica fiber, silica fiber, alumina fiber, zirconia fiber, boron nitride fiber, silicon nitride fiber, boron carbide fiber, silicon carbide fiber, asbestos fiber, inorganic fiber specialized for metal fiber, or Natural or synthetic fibers such as hemp, vinylon, polyamide, and polyester.

A preferred injection material is a resin paste made by mixing fillers, catalysts, mold release agents, chemical thickeners, etc. with BMCl (unsaturated polyester resin), which is injected by injection molding, transfer molding, etc., and glass chopped strands are added and kneaded. For example, urethane resin (which may contain reinforcing fibers) may be injected by reaction injection molding, which requires only a small flow pressure of the resin in the cavity due to low injection pressure.

When injecting the resin, a so-called resin injection method may be applied in which mat-like reinforcing fibers are placed in advance in the cavity and the resin is injected.

By blending various low-shrinkage agents into the above-mentioned resins and fiber-reinforced resins to suppress the shrinkage of the resin, it is possible to suppress warping, distortion, etc. of glass members integrally molded with the resin. .

A mirror made of an integrally molded product of the glass mirror of the present invention and a fiber-reinforced resin can be advantageously molded according to the method of the present invention. Figures 1 to 3 correspond to a glass mirror that is integrally molded with all the mirror surface left and the other parts covered with fiber-reinforced resin, and Figure 4 is a glass mirror that is molded in the same way with only a part of the mirror surface left. This corresponds to

An integrally molded product of the glass mirror and fiber reinforced resin of the present invention,
For example, when applying to optical parts for office equipment such as copying machines, fax machines, and bar code readers, where warping or distortion of mirror surfaces is avoided, it is necessary to use an integral coating of fiber-reinforced resin to suppress the effects of resin shrinkage. It is preferable to reduce the proportion in the molded product, approximately 50vo1% or less, or 3.
It is 0vo1% or less. As a fiber-reinforced resin, glass'! A: The thickness of the mirror is approximately 0.5~10mm, and the length is approximately 50~100mm.
It is possible to create a mirror surface that has stable flatness without warping or distortion over a long period of time, even though it can easily warp by itself.

[Example] Example 1 An integrally molded product of the mirror and FRP was obtained by transfer molding using a mirror as the glass member 3 in FIG. 2 and glass fiber reinforced polyester resin (FRI') as the injection resin. The molding conditions at that time are ■Mold temperature 140℃~15
0°C■Curing time is 1.5 minutes■Mold clamping pressure is 250g/c
m"■ - Average wall thickness of integrally molded product is 7 m/m length is 300
It was m/m. The pressing member 4 was formed by placing aluminum alloy pieces having a diameter of 1.5 m/m and a length of 3 m/m at a pitch of 50 m/m and pressing them with support rods 8 of the upper die of a molding die. The warpage of the integrally molded mirror was kept to 0.03 m/m or less.

Example 2 Molding was carried out in the same manner as in Example 1 except that a Teflon tape with a film thickness of 50 μm was applied to the surface of the mirror, and the warpage of the mirror was 0.03 m/m or less.

Example 3 A powder coating was applied in advance into the lower mold of a mold, glass was placed thereon, and molding was carried out in the same manner as in Example 1. The powder coating dissolved into the glass of the molded product and was transferred to become colored glass. Also, the warpage of the glass surface is 0.03m.
/m or less.

[Effect of the invention] The integrally molded product of the glass mirror and fiber reinforced resin of the present invention has the following properties:
It is possible to create a mirror surface with stable flatness without warping or distortion over a long period of time, and it also has excellent heat resistance, making it extremely effective as an optical component that requires particularly severe mirror surface flatness. .

Further, according to the method of the present invention, it is possible to efficiently obtain an integrally molded product of a glass member and a resin with excellent dimensional accuracy.

[Brief explanation of the drawing]

1 to 6 are cross-sectional views of the mold showing the glass member and pressing member inside the mold cavity. l...Upper mold, 2...Lower die, 3...Glass member, 4...Press member, 5...Mold cavity. 7...Resin, 8...Mold support rod, 9...Support bottle 1 Illustration rI! lI Aku 3 Drawing procedure amendment May 1999 (ν date

Claims (1)

[Scope of Claims] 1. A mirror made of an integrally molded product of glass and resin, which is formed by leaving part or all of the mirror surface of a glass mirror and covering other parts with fiber-reinforced resin. 2. A glass member and a pressing member disposed between the glass member and the inner surface of the mold are placed in the mold to perform mold clamping, and the glass member is pressed and fixed via the pressing member, and the glass member is A cavity is formed between the pressing member and the inner surface of the mold, and resin is injected into the cavity to form a glass member,
A method for manufacturing an integrally molded product of glass and resin, characterized by integrally molding a pressing member and resin.