WO2012058792A1

WO2012058792A1 - In-mold connected decorative composite plastic structural piece and manufacturing method thereof

Info

Publication number: WO2012058792A1
Application number: PCT/CN2010/002039
Authority: WO
Inventors: 张�林
Original assignee: 成都中基国业新材料有限责任公司
Priority date: 2010-11-03
Filing date: 2010-12-13
Publication date: 2012-05-10
Also published as: CN102085734A

Abstract

An in-mold connected decorative composite plastic structural piece and the manufacturing method thereof are disclosed. The structural piece comprises a decorative surface layer (1), a sandwiched adhesive layer (2) combined with the surface decorative layer(1) and a plastic structural layer (3) combined with the filled adhesive layer (2). The structural piece has high rigidity and low cost, and the method has high production speed and yield, and can effectively solve the problems of the stress and deformation of the composite piece due to the shrinkage of the plastic layer.

Description

In-mold connection decorative composite plastic structural member and manufacturing method thereof

The invention relates to a composite decorative technology of a plastic structural component, which can complete an in-mold connection decorative composite structural component suitable for use in the fields of electronic appliances, automobile interior parts, building materials and the like by injection molding or extrusion molding. Related to the production method.

Background technique:

Patent No. ZL200610020181. X provides an in-mold decorative plastic part which can be completed by a common injection mold and a manufacturing method thereof. In practical application, this patent cannot solve the deformation problem of some structures: When the plastic structural layer components in the product have large scale, the size exceeds the surface metal boundary, or the plastic layer is thicker, and there are more complex rib structures. When injection molding high-strength plastics, after the plastic molding of the above plastic structure is completed, the plastic will have a large dimensional shrinkage due to cooling from a high-temperature fluid state to a low-temperature solid state. During the shrinkage of the plastic, the internal stress is generated by the two materials because the metal layer material does not shrink.

If the shrinkage stress of the plastic exceeds the bending strength of the metal layer, it will cause bending deformation of the entire component, which may cause cracks in the plastic or cracks in the plastic-metal bonding layer.

Summary of the invention:

SUMMARY OF THE INVENTION An object of the present invention is to provide an in-mold joint decorative composite structural member having good rigidity and low production cost. Another object of the present invention is to provide an in-mold joint decorative composite plastic which is fast in production speed and high in yield and suitable for being completed in a mold and capable of effectively solving the stress and deformation problems of the composite due to shrinkage of the plastic layer. How to make structural parts.

The object of the invention is achieved in this way:

The in-mold decorative decorative composite structural member of the present invention comprises a surface decorative layer, a filling adhesive layer composited with the surface decorative layer, and a plastic structural layer composited with the filling adhesive layer.

The manufacturing method of the in-mold connecting decorative composite plastic structural member of the invention comprises the following steps:

1) Making a surface decorative layer, selecting or having a surface decorative effect, after punching, using a stamping die to form a surface decorative layer by three-dimensional molding;

2) using plastic injection molding, extrusion molding or injection molding plastic molding process to make plastic structural layer to make plastic structural layer; 3) placing the formed surface decorative layer into the mold cavity before the mold;

4) placing the shaped plastic structural layer on the mold back mold at a position corresponding to the position of the metal decorative layer in the mold cavity;

5) clamping the mold, and then injecting a filling bonding material into the mold;

6) After the filling and bonding material is cooled and solidified in the mold to form a filling and bonding layer which is combined with the surface decorative layer and the plastic structural layer, the formed in-mold joint decorative composite plastic structural member is removed by mold opening.

In the above method, when the plastic structural layer is formed, in order to make the connection between the filling adhesive layer material and the plastic structural layer tight, a tapered hole or a dovetail groove riveting structure is formed on the plastic structural layer member (the hole can also be used as a filling paste) Injecting the inlet of the material, or making an injection inlet on the plastic structural layer component according to the structural characteristics of the product, injecting the filling material into the gap between the surface decoration and the plastic structural layer through the injection inlet, thereby forming a surface decorative layer and a plastic structure Layer composite filling layer).

In the above method, an accurate positioning column for placing a plastic structural layer is mounted on the mold back mold. In the above method, the surface decorative layer is made of a metal thin plate having a thickness of 0. 1~1. 2mm coated metal or a surface decorative effect.

In the above method, the plastic structural layer is made of a reinforced acrylonitrile-butadiene-styrene copolymer, high impact polystyrene or transparent polycarbonate or polymethyl methacrylate.

The materials in the in-mold connection decorative composite structural member of the invention are selected as follows:

(1) Selection of surface decorative layer materials:

The following materials can be selected according to the needs of the product:

A. The thickness of the metal layer is 0. 1~: L 2mm (the thickness of the metal layer is mainly determined according to the size of the decorative piece, the size is a laminated metal plate, that is, a decorative layer having a pattern and/or a text on the surface of the metal plate. The larger the corresponding thickness, the thicker the decorative flexible layer consists of a transparent plastic film and a printed pattern and/or decorative layer on the inside of the transparent plastic film.

B. Metal sheet with surface decoration effect (such as wire drawing, mirror aluminum plate / stainless steel plate, etc.).

(2) Selection of materials for filling the bonding layer:

The function of filling the bonding layer is to complete the connection between the surface decorative layer and the plastic structural layer in the mold, and the material selection should be determined according to the type of the surface decorative layer material.

a. The surface of the metal substrate of the decorative layer has no surface coating, that is, the filling and bonding layer is directly connected with the metal interface, and a polymer material having strong binding force with metal, such as modified polyamide resin or modified polyurethane, may be selected. Polymers, but are not limited to these two types of polymeric materials. b. The metal substrate of the surface decorative layer has a rustproof or modified coating, and a polymer having the same polarity as the coating material may be selected to enable the filling layer to be fused to the metal coating.

(3) Selection of materials for plastic structural layers:

The material can be selected according to the appearance and performance requirements of the product. For higher strength requirements of plastic structural layers, reinforced acrylonitrile-butadiene-styrene (ABS), high impact polystyrene (HIPS) or other high-strength plastics may be used; For transparency or color requirements, the corresponding transparent polycarbonate (PC) or polymethyl methacrylate (PMMA) can also be used for injection molding. Since the molding of plastic structural parts is a relatively mature process, it is not enumerated here. .

Compared with the patent ZL200610020181. X and the conventional metal plastic connecting member and the manufacturing method thereof, the in-mold connecting decorative composite structural member and the manufacturing method thereof have the following advantages:

1. In the in-mold connection decorative composite structural member of the present invention, a filling adhesive layer is used to connect the surface decorative layer and the plastic structural layer, and the component is not bent due to shrinkage of the plastic, and the rigidity is good and the production cost is low.

2. The product can realize the close combination of various appearance decoration effects and plastic structural parts with different materials and properties, which greatly expands the application range of the products.

3. The invention completes the decorative effect of the plastic surface in the process of injection molding or extrusion or injection, and does not need subsequent decoration process, so the process is simple, the processing cost and the equipment input cost are saved, the production speed is fast, and the yield is high. . ,

The invention is applicable to decorative composite plastic parts of various sizes and various structures, such as appearance parts of electronic products, automotive interior parts, and composite plastic structural parts in other fields.

BRIEF DESCRIPTION OF THE DRAWINGS:

Figure 1 is a schematic diagram of a television frame.

Figure 2 is an enlarged view of the A-A section of Figure 1.

detailed description:

FIG. 1 and FIG. 2 are schematic diagrams showing the face frame of the television set of this embodiment. Referring to Fig. 1 and Fig. 2, the motor frame is composed of a film cold rolled steel sheet 1, a filling bonding layer 2, and a plastic structural layer 3 having a thickness of 0.65 ram. The size of the lower straight side of the plastic structural layer 3 has exceeded the outer edge size of the cold-rolled steel sheet.

The steps of the method for manufacturing the television frame of this embodiment are as follows:

1. Select cold-rolled steel sheet coated with decorative flexible material to cold-roll the above-mentioned coating After the steel plate is cut, it is three-dimensionally formed by a stamping die;

2. According to the product design requirements, the plastic structural layer is prepared. In this embodiment, high transparent polycarbonate (PC) plastic is used for injection molding. In order to make the connection of the modified adhesive resin and the plastic structural layer tightly and tightly, a tapered hole is formed on the plastic structural layer, and the hole is simultaneously used as an injection inlet for filling the bonding material;

3. Place the three-dimensionally formed cold-rolled steel sheet into the mold cavity before the mold, and place the injection-molded high-transparent polycarbonate plastic parts on the mold back mold (for accurate placement, install the corresponding mold on the mold back) Positioning column);

4. The mold is clamped, and then a filling adhesive material is injected into the cold rolled film steel sheet and the plastic structural member in the mold, and the hot melt filling adhesive material passes through the plastic structural member (layer) in the mold cavity. The tapered hole is fused to the cold-rolled steel sheet and the high transparent polycarbonate plastic part;

5. After the filling material is cooled and solidified, the decorative TV frame composite plastic structural member can be opened.

The above-mentioned embodiments are further described in the above description of the present invention, but the scope of the above-mentioned subject matter of the present invention should not be construed as being limited to the above embodiments. Techniques based on the above are all within the scope of the invention.

Claims

1. In-mold connection decorative composite plastic structural member, comprising a surface decorative layer, a filling adhesive layer composited with the surface decorative layer, and a plastic structural layer composited with the filling bonding layer.

2. The method of fabricating an in-mold connection decorative composite structural member according to claim, comprising the steps of:

1) Making a surface decorative layer, selecting a plate having a surface decorative effect, and after punching, forming a surface decorative layer by three-dimensional molding using a stamping die;

2) Selecting plastic molding layer by injection molding, extrusion molding or injection molding plastic molding process;

3) placing the formed surface decorative layer into the mold cavity before the mold;

6) After the filling and bonding material is cooled and solidified in the mold to form a filling and bonding layer which is combined with the surface decorative layer and the plastic structural layer, the formed in-mold joint decorative composite plastic structural member is taken out by mold opening.

3. The method for fabricating an in-mold joint decorative composite plastic structural member according to claim 2, wherein when the plastic structural layer is formed, the connection between the filling adhesive layer material and the plastic structural layer is tight and firm, and the plastic structural layer is Tapered holes or dovetail groove riveting structures are formed on the components.

4. The method of manufacturing an in-mold joint decorative composite plastic structural member according to claim 2 or 3, characterized in that an accurate positioning column for placing a plastic structural layer is mounted on the mold back mold.

The slab metal having a thickness of 0.1 to 1. 2 mm, which is laminated with a decorative flexible material, having a thickness of 0.1 to 1. 2 mm. A plate or a sheet of metal with a surface finish.

The method for manufacturing an in-mold joint decorative composite plastic structural member according to claim 2 or 3, wherein the plastic structural layer is made of reinforced acrylonitrile-butadiene-styrene copolymer or high-impact polystyrene or Made of transparent polycarbonate or polymethyl methacrylate.