CN100404239C - A method of making glass fiber reinforced plastic products by using non-metallic powder of waste circuit boards - Google Patents

Abstract

The invention discloses a method for making glass fiber reinforced plastic products by using non-metallic powder of discarded circuit boards, which belongs to the technical field of recycling waste products. By crushing and pulverizing waste circuit boards into powder; separating and drying non-metallic powder; designing and making molds according to the requirements of FRP products; adding raw materials; and molding to obtain FRP products designed by molds. Compared with the prior art, the present invention uses the non-metallic powder of discarded circuit boards, and the short glass fiber in the non-metallic powder improves the comprehensive mechanical and physical properties of FRP, especially the bending strength, according to the detection by the National FRP Quality Inspection Center. It has increased by 35%, which satisfies the requirements of FRP products in terms of technology, economy and environmental protection. In addition, it adopts reasonable glass fiber material layer design and molding method, which has simple process and low cost. There are strong applications in the field.

Description

A method of making glass fiber reinforced plastic products by using non-metallic powder of waste circuit boards

technical field

The invention relates to a method for making glass fiber reinforced plastic products by using non-metallic powder of discarded circuit boards, and belongs to the technical field of waste product recovery and reuse.

Background technique

The existing FRP product technology is made of glass fiber, sizing agent, unsaturated resin or epoxy resin or phenolic resin as the base material through a composite process.

The traditional manhole covers and water grates are cast iron manhole covers and water grates, which are expensive and easy to rust under natural conditions, and the water grates are prone to noise when vehicles pass by on the expressway. And because cast iron manhole cover and water grate have stolen phenomenon repeatedly, cause pedestrian and vehicle accident. Manhole covers and water grates made of steel fiber reinforced cement-based composite materials have low strength, are not impact-resistant, and are easily broken under the vibration and rolling of locomotives, which also pose a safety hazard. Therefore it is necessary to provide a kind of high strength, good toughness and durable and good well cover and water grate of social and economic benefits to meet the demand.

A method of making FRP products using non-metallic powder of discarded circuit boards, such as manhole covers that can be used for municipal roads, inspection of underground facilities such as drainage, telecommunications, gas, fire protection, etc., in highways, urban roads, squares, parks Preparation of composite water grates, panels and building decoration materials for indoor and green area drainage applications.

The wide application of electronic products has greatly promoted the development of social productivity; at the same time, the recycling and reuse of waste electronic products has become a headache. Printed circuit boards (PCBs) are found in almost all electronic and electrical products. Recycling non-metallic powders that account for about 70% of the total weight obtained after recycling printed circuit boards not only has significant economic benefits, but also protects the environment and saves energy.

Contents of the invention

The present invention adopts the mixture of non-metallic powder of waste circuit board—epoxy resin and glass fiber powder, adds glass fiber cloth, new unsaturated resin or epoxy resin or phenolic resin and then curing agent potassium peroxide ethyl ketone and promoting The FRP products made of cobalt naphthenate not only meet the requirements of economic benefits, but also have the advantages of environmental protection, energy saving, simple process, high strength, good toughness, good elastic recovery, corrosion resistance, and no loss. Coloring according to user needs to make the appearance beautiful.

In order to achieve the above object, the present invention relates to a method for making FRP products using non-metallic powder of waste circuit boards, which is characterized in that the method comprises the following steps:

(1) crushing, crushing

Firstly, the waste circuit boards are ground into powders ranging from 16 to 500 mesh through two processes of crushing and crushing;

(2) Separation of non-metallic powder and drying

Then use the difference in specific gravity between metal and non-metal to separate the non-metal powder and dry the non-metal powder;

(3) Design mold

Then design and manufacture molds according to the requirements of FRP products;

(4) Add raw materials

Add raw glass fiber cloth, one of phenolic resin or unsaturated resin or epoxy resin, non-metallic powder, and filler (including white carbon black, curing agent and accelerator) to the mold;

The weight ratio of each raw material added is:

Glass fiber cloth 0.45～0.50 parts;

0.30-0.40 parts of one of unsaturated resin or epoxy resin or phenolic resin;

Non-metallic powder 0.09～0.11 parts;

Filler 0.01～0.15 parts;

(5) Compression molding

After the step (4) is completed, mold it with a large-tonnage press to obtain the glass fiber reinforced plastic product designed by the mold.

Concrete compression molding method steps are:

(1) Preparation of resin mixture slurry

First add 15% to 25% of non-metallic powder and white carbon black to one of the unsaturated resin, epoxy resin or phenolic resin in proportion by weight; add 2% to 4% of curing agent at room temperature 25 degrees Celsius Potassium oxide ethyl ketone, 1% to 3% accelerator such as cobalt naphthenate, stirring in a stirrer at a speed of 450 to 750 r/min for 2 hours to obtain a resin mixture slurry for later use;

(2) Mold cleaning

The mold is cleaned, the surface is kept dry, and the release agent is evenly coated on the surface of the mold;

(3) form the surface layer

Then the surface layer (gel coat) is processed. The quality of the surface layer directly affects the use effect and life of the product. It is a layer with a high resin content. The resin will naturally solidify, and then place a glass fiber cloth impregnated with resin on the surface layer;

(4) Form a filling layer

Then add filling materials to form a filling layer: pour the resin mixture obtained by stirring according to the above ratio into the mold that has formed a surface layer, and form a filling layer by vibrating and enriching;

(5) Complete the ground floor

The resin-impregnated glass fiber cloth, according to the different products, selects different sizes of glass fiber cloth and different layers, stacks layers according to requirements, and scrapes the glass fiber cloth during the stacking process to form the bottom layer;

(6) Molding and curing molding

Then it is molded on a large-tonnage press and cured at room temperature for 24 hours. The curing process can also be accelerated by heating, and the trimming is completed.

In the industry, demoulding, trimming, inspection and storage are demoulding and trimming after curing and molding; according to the inspection standards, the appearance and mechanical properties of the cured products are inspected, and the qualified products are put into the finished product warehouse to leave the factory.

Compared with the prior art, the present invention uses the non-metallic powder of discarded circuit boards, and the short glass fiber in the non-metallic powder improves the comprehensive mechanical and physical properties of FRP, especially the bending strength, according to the detection by the National FRP Quality Inspection Center. It has increased by 35%, which satisfies the requirements of FRP products in terms of technology, economy and environmental protection. In addition, it adopts reasonable glass fiber material layup design and molding method, the process is simple, and the cost is reduced. There are strong applications in the technical field.

The implementation example of the present invention is in accordance with the provisions of the People's Republic of China's urban construction industry standard-regenerated resin composite material manhole cover CJ/T121-2000 and recycled resin composite water grate CJ/T130-2001, through experiments such as bearing capacity, the residual deformation is within the allowable range It meets the requirements of heavy load (water grate 130KN, well cover 240KN). It is an ideal substitute for cast iron manhole covers and water grates, and solves the problems of hidden safety hazards such as theft.

Description of drawings

Fig. 1 is a flow chart of the present invention.

Fig. 2 is a schematic diagram of compression molding of the present invention.

Fig. 3 is a schematic diagram of a glass fiber reinforced plastic product water grate produced by using non-metallic powder of discarded circuit boards according to the embodiment of the present invention.

Fig. 4 is a schematic diagram of a manhole cover made of glass fiber reinforced plastics made of non-metallic powder of discarded circuit boards according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of a glass fiber reinforced plastic product plate produced by using non-metallic powder of discarded circuit boards according to an embodiment of the present invention.

Detailed ways

Fig. 1 is a flow chart of the present invention. Fig. 2 is a schematic diagram of the compression molding of the present invention, wherein, the box is the compression molding process, and the industry also has demoulding, trimming, inspector's inspection, qualified storage, etc.

The present invention is illustrated below by examples.

Example 1 FRP product water grate made of non-metallic powder from waste circuit boards

A kind of method that utilizes the non-metallic powder of waste circuit board to make glass fiber reinforced plastics water grate, comprises the following steps:

(1) crushing, crushing

Firstly, the waste circuit boards are ground into powders ranging from 16 to 500 mesh through two processes of crushing and crushing;

(2) Separation of non-metallic powder and drying

Then use the difference in specific gravity between metal and non-metal to separate the non-metal powder and dry the non-metal powder;

(3) Design mold

Then design and manufacture the mold according to the requirements of the water grate;

(4) Add raw materials

Add glass fiber cloth, phenolic resin, non-metallic powder and filler composed of white carbon black, curing agent and accelerator into the mold;

The weight ratio of each raw material added is:

Glass fiber cloth 0.45 parts;

Phenolic resin 0.30 parts;

Non-metallic powder 0.10 parts;

Filler, including silica, curing agent and accelerator 0.15 parts;

(5) Compression molding

Step (4) is molded with a large-tonnage press after the completion of the step, and the glass fiber reinforced plastic product water grate of the mold design is obtained;

Concrete compression molding method steps are:

(1) Preparation of resin mixture slurry

First add non-metallic powder and white carbon black with a weight ratio of 15% to the phenolic resin; add a weight ratio of 4% curing agent such as potassium peroxide ethyl ketone at a room temperature of 25 degrees Celsius, and a weight ratio of 1.5% accelerator such as naphthenic acid Cobalt, stir evenly in the stirrer, stirring speed is 450r/min, obtains the resin mixture slurry for subsequent use;

(2) Mold cleaning

The mold is cleaned, the surface is kept dry, and the release agent is evenly coated on the surface of the mold;

(3) form the surface layer

Then the surface layer (gel coat) is processed. The quality of the surface layer directly affects the use effect and life of the product. It is a layer with a high resin content. The resin will naturally solidify, and then place a glass fiber cloth impregnated with resin on the surface layer;

(4) Form a filling layer

Then add filling materials to form a filling layer: pour the resin mixture obtained by stirring according to the above ratio into the mold that has formed a surface layer, and form a filling layer by vibrating and enriching;

(5) Complete the ground floor

The resin-impregnated glass fiber cloth, according to the different products, selects different sizes of glass fiber cloth and different layers, stacks layers according to requirements, and scrapes the glass fiber cloth during the stacking process to form the bottom layer;

(6) Molding and curing molding

Then it is molded on a large-tonnage press and cured at room temperature for 24 hours. The curing process can also be accelerated by heating, and the trimming is completed.

The water grate produced is shown in Figure 3. 3 is a schematic diagram of a water grate for FRP products made of non-metallic powder of waste circuit boards according to the embodiment of the present invention, wherein 1 is a drainage hole and 2 is a water grate.

Example 2 A glass fiber reinforced plastic manhole cover made of non-metallic powder from waste circuit boards

A method for making a manhole cover made of glass fiber reinforced plastics using non-metallic powder of discarded circuit boards, comprising the following steps:

(1) crushing, crushing

Firstly, the waste circuit boards are ground into powders ranging from 16 to 500 mesh through two processes of crushing and crushing;

(2) Separation of non-metallic powder and drying

Then use the difference in specific gravity between metal and non-metal to separate the non-metal powder and dry the non-metal powder;

(3) Design mold

Then design and manufacture the mold according to the requirements of the manhole cover;

(4) Add raw materials

Add glass fiber cloth, unsaturated resin, non-metallic powder, filler composed of white carbon black, curing agent and accelerator into the mold;

The weight ratio of each raw material added is:

Glass fiber cloth 0.50 parts;

Unsaturated resin 0.40 parts;

Non-metallic powder 0.09 parts;

Filler, including silica, curing agent and accelerator 0.01 part;

(6) Compression molding

After the step (4) is completed, mold it with a large-tonnage press to obtain a glass fiber reinforced plastic manhole cover designed by the mold.

Concrete compression molding method steps are:

(1) Preparation of resin mixture slurry

First add 20% non-metallic powder and white carbon black to the unsaturated resin; add 3% curing agent such as potassium peroxide ethyl ketone and 1% accelerator such as cobalt naphthenate at room temperature 25 degrees Celsius, and stir evenly in the mixer , the stirring speed is 600r/min, and the resin mixture slurry is obtained for subsequent use;

(2) Mold cleaning

The mold is cleaned, the surface is kept dry, and the release agent is evenly coated on the surface of the mold;

(3) form the surface layer

Then the surface layer (gel coat) is processed. The quality of the surface layer directly affects the use effect and life of the product. It is a layer with a high resin content. The resin will naturally solidify, and then place a glass fiber cloth impregnated with resin on the surface layer;

(4) Form a filling layer

Then add filling materials to form a filling layer: pour the resin mixture obtained by stirring according to the above ratio into the mold that has formed a surface layer, and form a filling layer by vibrating and enriching;

(5) Complete the ground floor

The resin-impregnated glass fiber cloth, according to the different products, selects different sizes of glass fiber cloth and different layers, stacks layers according to requirements, and scrapes the glass fiber cloth during the stacking process to form the bottom layer;

(6) Molding and curing molding

Then it is molded on a large-tonnage press and cured at room temperature for 24 hours. The curing process can also be accelerated by heating, and the trimming is completed.

The manhole cover produced is shown in Figure 4. Fig. 4 is a schematic diagram of a manhole cover made of glass fiber reinforced plastics made of non-metallic powder of discarded circuit boards according to an embodiment of the present invention, where 3 is an anti-skid pattern and 4 is an installation hole.

Embodiment 3 utilizes the non-metallic powder of waste circuit board to make the glass fiber reinforced plastic product sheet material

A kind of method that utilizes the non-metallic powder of waste circuit board to make the plate of FRP product, comprises the following steps:

(1) crushing, crushing

First, the waste circuit boards are ground into powders ranging from 16 to 500 meshes through two processes of crushing and crushing;

(2) Separation of non-metallic powder and drying

Then use the difference in specific gravity between metal and non-metal to separate the non-metal powder and dry the non-metal powder;

(3) Design mold

Then design and manufacture the mold according to the requirements of the plate;

(4) Add raw materials

Add glass fiber cloth, one of phenolic resin or unsaturated resin or epoxy resin, non-metallic powder, filler composed of white carbon black, curing agent and accelerator to the mold;

The weight ratio of each raw material added is:

Glass fiber cloth 0.48 parts;

Epoxy resin 0.36 parts;

Non-metallic powder 0.11 parts;

Filler, including silica, curing agent and accelerator 0.05 parts;

(5) Compression molding

After the step (4) is finished, mold pressing with a large-tonnage press to obtain the glass fiber reinforced plastic product sheet material designed by the mold;

Concrete compression molding method steps are:

(1) Preparation of resin mixture slurry

First add 25% non-metallic powder and a small amount of white carbon black to the epoxy resin; add 2% curing agent such as potassium peroxide ethyl ketone and 3% accelerator such as cobalt naphthenate at room temperature 25 degrees Celsius, and stir in the mixer Evenly, the stirring speed is 750r/min, and the resin mixture slurry is obtained for subsequent use;

(2) Mold cleaning

The mold is cleaned, the surface is kept dry, and the release agent is evenly coated on the surface of the mold;

(3) form the surface layer

Then the surface layer (gel coat) is processed. The quality of the surface layer directly affects the use effect and life of the product. It is a layer with a high resin content. The resin will naturally solidify, and then place a glass fiber cloth impregnated with resin on the surface layer;

(4) Form a filling layer

Then add filling materials to form a filling layer: pour the resin mixture obtained by stirring according to the above ratio into the mold that has formed a surface layer, and form a filling layer by vibrating and enriching;

(5) Complete the ground floor

The resin-impregnated glass fiber cloth, according to the different products, selects different sizes of glass fiber cloth and different layers, stacks layers according to requirements, and scrapes the glass fiber cloth during the stacking process to form the bottom layer;

(6) Molding and curing molding

Then it is molded on a large-tonnage press and cured at room temperature for 24 hours. The curing process can also be accelerated by heating, and the trimming is completed.

The fabricated board is shown in Figure 5. Fig. 5 is a schematic diagram of a glass fiber reinforced plastic product plate produced by using non-metallic powder of discarded circuit boards according to an embodiment of the present invention.

The present invention has the advantages of the existing technology for making glass fiber reinforced plastic products:

1. The method of making FRP products by this process is simple, has low requirements for equipment, large usage, low production cost of raw materials, and the price of FRP products is lower than that of existing products, with remarkable economic benefits.

2. The present invention has adopted the non-metallic powder of discarded circuit boards, and the short glass fiber in the non-metallic powder improves the comprehensive mechanical and physical properties of FRP, especially the bending strength, which has been improved by 35% through the detection of the National FRP Quality Inspection Center. Greatly enhances material properties.

3. Recycling waste electronic products, turning waste into treasure, saving a lot of steel for the country, and the energy saving effect is remarkable.

4. Protect the environment, dispose of waste materials, and reduce the pollution caused by waste materials to the environment.

Claims (4)

1. A method utilizing the non-metallic powder of discarded circuit boards to make FRP products, characterized in that the method may further comprise the steps: (1) crushing, crushing First, the waste circuit boards are ground into powders ranging from 16 to 500 meshes through two processes of crushing and crushing; (2) Separation of non-metallic powder and drying Then use the difference in specific gravity between metal and non-metal to separate the non-metal powder and dry the non-metal powder; (3) Design mold Design and manufacture molds according to the requirements of FRP products; (4) Add raw materials Add raw glass fiber cloth, phenolic resin or unsaturated resin or epoxy resin, non-metallic powder and filler into the mold; The weight ratio of each raw material added is: Glass fiber cloth 0.45～0.50 parts; One of phenolic resin or unsaturated resin or epoxy resin 0.30～0.40 parts; Non-metallic powder 0.09～0.11 parts; Filler 0.01～0.15 parts; (5) Compression molding After the step (4) is completed, mold it with a press to obtain the fiberglass product designed by the mold. 2. a kind of method utilizing the non-metallic powder of waste circuit board to make FRP product according to claim 1, it is characterized in that, described compression molding comprises the following steps: (1) Preparation of resin mixture slurry First add 15% to 25% non-metallic powder and white carbon black to one of the phenolic resins, unsaturated resins or epoxy resins by weight; add 2% to 4% curing agent at room temperature of 25 degrees Celsius, 1% ～3% accelerator, stir in a stirrer at a speed of 450～750r/min for 2 hours to obtain a resin mixture slurry for later use; (2) Mold cleaning The mold is cleaned, the surface is kept dry, and the release agent is evenly coated on the surface of the mold; (3) form the surface layer Then process the surface layer through the resin, that is, the gel coat. After the resin is naturally solidified, place the glass fiber cloth impregnated with the resin on the surface layer; (4) Form a filling layer Pour the resin mixture obtained by mixing according to the proportion of step (1) into the mold that has formed the surface layer, and form a filling layer by vibrating and enriching; (5) Complete the ground floor The resin-impregnated glass fiber cloth, according to the different products, selects different sizes of glass fiber cloth and different layers, stacks layers according to requirements, and scrapes the glass fiber cloth during the stacking process to form the bottom layer; (6) Molding and curing molding Then it is molded on a large-tonnage press, and cured at room temperature for 24 hours, or the curing process is accelerated by heating, and the trimming is completed. 3. a kind of method utilizing the non-metallic powder of waste circuit board to make FRP product according to claim 2, it is characterized in that, described curing agent is potassium peroxide ethyl ketone. 4. A method for making FRP products using non-metallic powder of waste circuit boards according to claim 2, characterized in that the accelerator is cobalt naphthenate.

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