CN111958777A

CN111958777A - FRP laminated formwork and manufacturing method thereof

Info

Publication number: CN111958777A
Application number: CN202010811461.2A
Authority: CN
Inventors: 敬维亮
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2020-11-20

Abstract

An FRP superposed template comprises four angular frames; each angular frame is provided with a plurality of equidistant U-shaped grooves, when a concrete plate is processed, reinforcing steel bars are inserted into the middle of the concrete, the end parts of the reinforcing steel bars are erected in the U-shaped grooves, the lowest points of the U-shaped grooves are positioned in the middle of the angular frames, the reinforcing steel bars are prevented from sinking through the U-shaped grooves, and the manufacturing method of the FRP superposed template comprises the steps of creating appropriate environmental conditions, selecting raw materials, manufacturing gel coats, configuring resin glue solution, paving a mould base layer, and demoulding and finishing. The invention uses the die layering method, the manufacture of the die reinforcing layer can be finished in one day, the die can be demoulded in two days, the forming speed of the base layer can be accelerated due to the adoption of the zero-shrinkage curing system, the glass fiber injection can be used for obtaining higher efficiency, the die has more excellent dimensional stability, and the die has better surface effect.

Description

FRP laminated formwork and manufacturing method thereof

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of manufacturing of new composite materials, in particular to an FRP (fiber reinforced plastic) laminated template and a manufacturing method thereof.

[ background of the invention ]

FRP (Fiber Reinforced Plastics, Fiber Reinforced composite Plastics), also known as glass Fiber Reinforced Plastics. The FRP composite material is a high-performance material formed by mixing a fiber material and a matrix material according to a certain proportion. Generally, FRP has the characteristics of light weight, hardness, non-conductivity, high mechanical strength, less recycling, corrosion resistance and the like.

The FRP superimposed formwork is a common device in the building field, is mainly used for forming and processing concrete plates, and is more and more favored in the aspect of formwork manufacturing due to the characteristics of light weight, hardness and high mechanical strength.

The glass fiber reinforced plastic mold is manufactured by firstly manufacturing a female mold, namely a product sample. At present, female dies for manufacturing glass fiber reinforced plastic dies are mostly manufactured by base materials such as gypsum, wood, cement, paraffin and the like, and the female dies manufactured by the materials are often low in size precision, rough in surface quality, complex in processing, easy to generate air holes and cracks, poor in flatness and the like.

Therefore, it is an urgent need in the art to provide an FRP laminated formwork and a method for manufacturing the same, which can solve the problems of low dimensional accuracy, poor surface quality, complicated processing, etc. of the conventional method for manufacturing a female mold.

[ summary of the invention ]

Aiming at the problems, the invention uses the die layering method, the manufacture of the die reinforcing layer can be finished in one day, the demoulding can be carried out in two days, the forming speed of the base layer can be accelerated due to the adoption of the zero-shrinkage curing system, the glass fiber injection can be used for obtaining higher efficiency, the die has more excellent dimensional stability, and the die has better surface effect.

In order to solve the problems, the FRP superposed template comprises four angular frames, and the superposed template surrounded by the four angular frames is arranged on a base and can be used for processing and forming concrete plates; set up the U type recess of a plurality of equidistance on every angular form frame, during processing concrete slab, the intermediate interlude has the reinforcing bar in the concrete, and the tip of reinforcing bar is erect in U type recess, and the U goes in the middle of the minimum of recess is located angular form frame, prevents through U going in the recess that the reinforcing bar from sinking, treats that concrete molding back can take out concrete slab from FRP coincide template fast through the reinforcing bar that stretches out the frame.

Further, the manufacturing method of the FRP laminated template comprises the following process flows: creating proper environmental conditions → selecting raw materials → making gel coat → arranging resin glue solution → laying mould base layer → demoulding and finishing.

Further, the temperature of the environmental condition is 21-28 ℃, and the relative humidity is less than 70%.

Furthermore, in the raw materials, the matrix resin adopts WSP6101 type epoxy resin, the curing agent adopts epoxy resin normal temperature E-999 curing agent, the diluent adopts acetone, and the fiber reinforced material adopts 300g/m2 alkali-free chopped strand mat and glass fiber checkered cloth.

Further, the gel coat is divided into two layers, each layer is sprayed for three times, the first layer of the gel coat is sprayed for the first time, then the second layer of the gel coat is sprayed in the direction perpendicular to the first layer of the gel coat, finally the third layer of the gel coat is sprayed in the direction of the first time, the second layer of the gel coat can be sprayed after the first layer of the gel coat is solidified for 90-120 minutes, and the spraying mode is the same as that of the first layer of the gel coat.

Further, the resin glue solution is prepared by heating epoxy resin in a constant temperature oven of 60 ℃ for 30min to reduce the viscosity of the epoxy resin, then mixing 100 parts of WSP6101 type epoxy resin and 8-10 parts of acetone or epoxypropane butyl ether in a clean container, uniformly stirring by an electric stirrer or manually, then adding 20-25 parts of curing agent, rapidly stirring, and carrying out vacuum defoaming for 1-3 min to remove bubbles in the resin glue solution.

And further, a rapid die laying method is adopted for laying the die base layer, the flow is as follows, 1, 6 layers of alkali-free chopped strand mats with the weight of 450 g/square or 300 g/square are continuously laid to obtain the thickness of 3-4 mm, and when each layer is laid, the resin glue solution prepared in the fourth step is uniformly rolled and coated on the die base layer by using a resin rolling method. Simultaneously, defoaming rollers are used for defoaming bubbles; 2. when the resin is cured and the paving layer becomes white, paving 4-6 layers below after one hour, wherein the operation method is the same as the above; 3. repeat 1 and 2 until the design thickness is reached.

Further, the demolding and finishing are carried out at normal temperature, the demolding can be carried out after the curing and shaping are carried out for 48 hours, and compressed air is used for intermittent blowing as far as possible during demolding.

In addition, the invention uses the die layering method, the manufacture of the die reinforcing layer can be finished in one day, the die can be demoulded in two days, the forming speed of the base layer can be accelerated due to the adoption of the zero-shrinkage curing system, the glass fiber injection can be used for obtaining higher efficiency, the die has more excellent dimensional stability, and the die has better surface effect.

[ description of the drawings ]

FIG. 1 is a schematic structural view of an FRP laminated formwork according to the present invention.

[ detailed description ] embodiments

The directional terms of the present invention, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", etc., are only directions in the drawings, and are only used to explain and illustrate the present invention, but not to limit the scope of the present invention.

Referring to fig. 1, a FRP laminated formwork assembly structure is shown, which includes four angular frames, and a laminated formwork surrounded by the four angular frames is installed on a base, so that the laminated formwork can be used for processing and molding concrete plates; set up the U type recess of a plurality of equidistance on every angular form frame, during processing concrete slab, the intermediate interlude has the reinforcing bar in the concrete, and the tip of reinforcing bar is erect in U type recess, and the U goes in the middle of the minimum of recess is located angular form frame, prevents through U going in the recess that the reinforcing bar from sinking, treats that concrete molding back can take out concrete slab from FRP coincide template fast through the reinforcing bar that stretches out the frame.

The manufacturing method of the FRP superposed template comprises the following steps:

the method comprises the following steps: creating suitable environmental conditions

The adaptability for manufacturing the FRP superposed template is 21-28 ℃, the process can be prolonged or accelerated if the environment temperature is not suitable, and the performance of the mould is adversely affected; and (4) the relative humidity is less than 70%, otherwise, the curing of the matrix material is adversely affected.

Step two: selecting raw materials

The WSP6101 type epoxy resin is adopted as the matrix resin, the epoxy resin has low curing shrinkage rate and excellent electrical insulation performance, is stable to various acids, alkalis and organic solvents, has tensile strength of 450-700 kg/cm2, and has bending strength of 900-1200 kg/cm 2. The curing agent adopts epoxy resin normal temperature E-999 curing agent. Acetone (or propylene oxide butyl ether) is used as the diluent. The fiber reinforced material for making the FRP mould adopts 300g/m2 alkali-free chopped strand mat and glass fiber checkered cloth.

Step three: making gel coat

The mold gel coat is thoroughly stirred with a pneumatic stirrer before use, and it is ensured that all the materials in the tub are thoroughly mixed, and that the gel coats at the bottom and at the edge of the tub are also thoroughly mixed. The gel coat is then allowed to remain for several minutes to recover its own viscosity and to defoam before use; the gel coat is divided into two layers, each layer is sprayed for three times, the first layer of the gel coat is sprayed firstly, then the second layer of the gel coat is sprayed in the direction vertical to the first layer, finally the third layer of the gel coat is sprayed according to the direction of the first layer, the second layer of the gel coat can be sprayed after the first layer of the gel coat is solidified for 90-120 minutes, and the spraying mode is the same as that of the first layer of the gel coat.

Step four: preparing resin glue solution

Because the resin viscosity is very high at normal temperature, the epoxy resin can be heated in a constant temperature box at 60 ℃ for 30min to reduce the viscosity, then 100 parts of WSP6101 epoxy resin and 8-10 parts (weight ratio) of acetone (or epoxypropane butyl ether) are mixed in a clean container, after the mixture is uniformly stirred by an electric stirrer or manually, 20-25 parts of curing agent is added (the adding amount of the curing agent is properly increased or decreased according to the current air temperature and field temperature), the mixture is rapidly stirred and is defoamed in vacuum for 1-3 min to remove the bubbles in the resin glue solution, and the epoxy resin can be used

Step five: laying mold base

The invention adopts a rapid die laying method, which comprises the following steps of 1, continuously laying 6 layers of alkali-free chopped strand mats with the thickness of 450 g/square or 300 g/square to obtain the thickness of 3-4 mm, and when laying each layer, uniformly rolling and coating the resin glue solution prepared in the step four on a die base layer by using a resin rolling and coating method. Simultaneously, defoaming rollers are used for defoaming bubbles; 2. when the resin is cured and the paving layer becomes white, paving 4-6 layers below after one hour, wherein the operation method is the same as the above; 3. repeat 1 and 2 until the design thickness is reached.

Step six: demold finishing

The pasted mould is basically solidified and shaped after 48 hours at normal temperature (about 20 ℃), and the mould can be demoulded, and compressed air is used for intermittent blowing as much as possible during demould so as to gradually separate the mould from the female mould. And (3) performing mechanical processing such as drilling on the die after demolding according to the use requirement of the die, performing post-processing on the die, sequentially polishing the surface of the die by using 400# to 1000# waterproof abrasive paper, and performing surface polishing on the die by using a polishing machine, wherein the die can be put into use after all the processes are finished.

The invention uses the die layering method, the manufacture of the die reinforcing layer can be finished in one day, the die can be demoulded in two days, the forming speed of the base layer can be accelerated due to the adoption of the zero-shrinkage curing system, the glass fiber injection can be used for obtaining higher efficiency, the die has more excellent dimensional stability, and the die has better surface effect.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The FRP superposed template is characterized by comprising four angular frames, and the superposed template surrounded by the four angular frames is arranged on a base and can be used for processing and forming concrete plates; set up the U type recess of a plurality of equidistance on every angular form frame, during processing concrete slab, the intermediate interlude has the reinforcing bar in the concrete, and the tip of reinforcing bar is erect in U type recess, and the U goes in the middle of the minimum of recess is located angular form frame, prevents through U going in the recess that the reinforcing bar from sinking, treats that concrete molding back can take out concrete slab from FRP coincide template fast through the reinforcing bar that stretches out the frame.

2. A method for manufacturing the FRP laminated formwork as claimed in claim 1, wherein the method for manufacturing the FRP laminated formwork comprises the following steps: creating proper environmental conditions → selecting raw materials → making gel coat → arranging resin glue solution → laying mould base layer → demoulding and finishing.

3. The manufacturing method of the FRP laminated formwork as claimed in claim 2, wherein the temperature of the environmental condition is 21-28 ℃ and the relative humidity is less than 70%.

4. The method for manufacturing the FRP laminated formwork according to claim 2, wherein in the raw materials, the base resin adopts WSP6101 type epoxy resin, the curing agent adopts epoxy resin normal temperature E-999 curing agent, the diluent adopts acetone, and the fiber reinforcement material adopts 300g/m2 alkali-free chopped strand mat and glass fiber checkered cloth.

5. The method for making an FRP (fiber reinforced Plastic) laminated formwork as claimed in claim 2, wherein the gel coat is applied in two layers and three times per layer, wherein the first gel coat is applied for the first time, the second gel coat is applied in a direction perpendicular to the first time, and the third gel coat is applied in the direction of the first time, and the second gel coat is applied after the first gel coat is cured for 90-120 minutes in the same manner as the first gel coat.

6. The method for manufacturing the FRP superimposed template as claimed in claim 2, wherein the resin glue solution is prepared by heating epoxy resin in a constant temperature oven of 60 ℃ for 30min to reduce the viscosity of the epoxy resin, then mixing 100 parts of WSP6101 type epoxy resin and 8-10 parts of acetone or epoxypropane butyl ether in a clean container, uniformly stirring by an electric stirrer or manually, then adding 20-25 parts of curing agent, rapidly stirring, and carrying out vacuum defoaming for 1-3 min to remove air bubbles in the resin glue solution.

7. The method for making FRP laminated formwork according to claim 2, wherein the rapid mould laying method is adopted for laying the mould base layer, the flow is as follows, 1. continuously laying 6 layers of alkali-free chopped strand mats with 450 g/square or 300 g/square to obtain the thickness of 3-4 mm, and when laying each layer, using a resin rolling method to evenly roll the resin glue solution made in the step four on the mould base layer. Simultaneously, defoaming rollers are used for defoaming bubbles; 2. when the resin is cured and the paving layer becomes white, paving 4-6 layers below after one hour, wherein the operation method is the same as the above; 3. repeat 1 and 2 until the design thickness is reached.

8. The method for making an FRP laminated formwork as claimed in claim 2, wherein the demolding and finishing are carried out at normal temperature, the FRP laminated formwork is substantially cured and shaped after 48 hours, namely demolding is carried out, and the FRP laminated formwork is intermittently blown by compressed air as far as possible during demolding.