CN112936672A

CN112936672A - Scale cleaning method for forming die for EPS foam production

Info

Publication number: CN112936672A
Application number: CN202110207794.9A
Authority: CN
Inventors: 王本明; 孙隽; 徐利
Original assignee: Anhui Huisheng Packaging Co ltd
Current assignee: Anhui Huisheng Packaging Co ltd
Priority date: 2021-02-25
Filing date: 2021-02-25
Publication date: 2021-06-11

Abstract

The invention discloses a method for cleaning scale of a forming die for EPS foam production, which comprises the following steps: (1) soaking a forming die for EPS foam production in an acid washing pool; (2) and washing the soaked forming die by a high-pressure water gun. The scale cleaning method for the forming die for EPS foam plastic production is simple and easy to operate, labor-saving and low in cost, does not damage a metal matrix of the forming die, and is free of air plug after cleaning, and an aluminum alloy air plug is as new and has good popularization prospect.

Description

Scale cleaning method for forming die for EPS foam production

Technical Field

The invention belongs to the technical field of scale surface cleaning, and particularly relates to a method for cleaning scale of a forming die for EPS foam plastic production.

Background

EPS foam plastic is polystyrene foam plastic, and is widely applied to the fields of packaging, heat preservation, water resistance, heat insulation, shock absorption and the like due to the characteristics of light weight, firmness, shock absorption, low moisture absorption, easiness in molding, good water resistance, heat insulation, low price and the like, and is one of the most widely applied plastics in the world at present. The foam plastic molding is completed by utilizing a mold, the existing EPS plastic foam molding mold is basically composed of an upper concave mold and a lower convex mold, and the required foam plastic is processed by the mold cavities with different shapes formed by an upper mold and a lower mold. The EPS foam plastic is processed by putting EPS raw material particles into a film cavity, inputting steam for foaming, introducing water into a mold for cooling to separate a foam product from a metal mold, opening the mold and simultaneously introducing water and compressed air for demolding. Because a large amount of water vapor is adopted in the production, the residual corner burrs of the formed mould during the manufacturing process are combined with the water quality condition, scale accumulation and agglomeration growth easily occur, and the use of the forming mould is further influenced.

At present, manual acid washing is mostly adopted for cleaning the scale of the forming die for EPS foam production, acidic cleaning liquid is poured on the surface of the die and is corroded and stripped by acid and the scale, so that the cleaning effect is realized, but the method is very easy to leave partial cleaning liquid in the die, so that the cleaning is not thorough enough, secondary scale is easy to generate, and meanwhile, the used cleaning liquid is easy to corrode and damage the metal of the die.

Disclosure of Invention

The invention aims to make up the defects of the prior art and provides a method for cleaning scale of a forming die for EPS foam production.

In order to achieve the above object, the present invention provides the following technical solutions:

a method for cleaning scale of a forming die for EPS foam production comprises the following steps:

(1) soaking a forming die for EPS foam production in an acid washing pool;

(2) and washing the soaked forming die by a high-pressure water gun.

Further, the solution of the pickling water pool is prepared from edible citric acid and water according to the mass ratio of (1-2): (8-9) mixing and preparing.

Furthermore, the solution of the pickling water pool also comprises 20 parts of Tween and 10-20 parts of polyacrylic acid, wherein the Tween and the polyacrylic acid have the concentrations of 0.1-0.3mg/L and 10-20 mg/L.

Furthermore, the flowing solution is adopted in the pickling water pool, the flowing speed is 0.5-2.0m/s, the solution temperature is 50-70 ℃, and the soaking time is 24-48 hours.

Further, the working pressure of the high-pressure water gun is 12-15 MPa.

Furthermore, magnetized abrasive materials with the mass fraction of 0.1-5.0% are added into the high-pressure water gun flushing water.

Furthermore, the magnetized abrasive is prepared from the following raw materials in parts by weight: 30-50 parts of garnet powder, 1-3 parts of talcum powder, 16-20 parts of ferroferric oxide, 5-8 parts of nickel powder, 12-16 parts of silicon dioxide, 8-10 parts of zirconium oxide and 4-6 parts of calcium oxide.

Preferably, the magnetized abrasive is prepared from the following raw materials in percentage by mass: 40 parts of garnet powder, 2 parts of talcum powder, 18 parts of ferroferric oxide, 6 parts of nickel powder, 14 parts of silicon dioxide, 9 parts of zirconium oxide and 5 parts of calcium oxide.

Further, the preparation method of the magnetized abrasive material comprises the following steps:

(1) mixing the raw materials in parts by weight, adding the mixture into water, stirring to form slurry, and heating the slurry to form a curing material;

(2) and (3) feeding the solidified material into a calcining furnace for calcining, naturally cooling to normal temperature after the calcining, and crushing and ball-milling to obtain the magnetized abrasive material.

Preferably, the calcination temperature in the step 2 is 1100-1300 ℃, and the time is 2-4 hours.

The invention has the advantages that:

the scale cleaning method of the invention is firstly soaking in a pickling water pool, wherein the pickling solution mainly comprises organic acid edible citric acid, and the temperature is increased to flow so as to improve the processing speed, compared with the conventional pickling solution, the method can not damage metal components such as aluminum, copper and the like in a mould, and the metal components are stripped through corrosion with the scale, and simultaneously, the soil temperature 20 and polyacrylic acid components are added, wherein the soil temperature 20 can be used as a surfactant to increase the dispersion degree of polyacrylic acid in the citric acid solution, and a protective film layer is formed on the metal surface of the mould through the corrosion inhibition effect of the polyacrylic acid, so that the phenomenon of 'over-pickling' is prevented, and the metal matrix of a forming mould.

Wash through the high-pressure squirt after the pickling, utilize the high-pressure pump to make the high-pressure water pass through pipeline and nozzle formation high-speed efflux impact the mould surface in succession, make the desorption of remaining incrustation scale, can wash remaining pickle composition simultaneously, on this basis, additionally add the magnetization abrasive material in the wash water, can show the grinding effect that strengthens rivers, improve and wash efficiency, save the water consumption, the magnetization abrasive material that uses adopts garnet powder and magnetic powder etc. as the raw materials, hardness is high, high wear resistance, can utilize magnetism to retrieve fast simultaneously.

The method for cleaning the scale of the forming die for EPS foam production has the advantages of simple process, easy operation, labor saving, low cost, no damage to the metal matrix of the forming die, smooth air plug after cleaning, and good popularization prospect if the aluminum alloy air plug is new.

Detailed Description

The technical scheme of the invention is further explained by combining the specific examples as follows:

example 1

(1) soaking a forming die for producing EPS foam plastic in an acid washing pool, wherein the solution of the acid washing pool is prepared from edible citric acid and water in a mass ratio of 1.5: 8.5, and also comprises 20-earth temperature with the concentration of 0.2mg/L and 15mg/L polyacrylic acid, the flow speed of the solution is 1.5m/s, the temperature is 60 ℃, and the soaking time is 36 hours.

(2) And (3) washing the soaked forming die by a high-pressure water gun with the working pressure of 14MPa, and adding 2.5 mass percent of magnetized abrasive in the washing water.

The magnetized abrasive is prepared from the following raw materials in parts by weight: 40 parts of garnet powder, 2 parts of talcum powder, 18 parts of ferroferric oxide, 6 parts of nickel powder, 14 parts of silicon dioxide, 9 parts of zirconium oxide and 5 parts of calcium oxide.

The preparation method of the magnetized abrasive material comprises the following steps:

(2) and (3) calcining the solidified material in a calcining furnace at 1200 ℃ for 3 hours, naturally cooling to normal temperature after the calcining is finished, and crushing and ball-milling to obtain the magnetized abrasive.

Example 2

(1) soaking a forming die for EPS foam plastic production in a pickling tank, wherein the solution of the pickling tank is prepared from edible citric acid and water in a mass ratio of 1: 9, and also comprises 20 earth temperature with the concentration of 0.1mg/L and 10mg/L polyacrylic acid, the flowing speed of the solution is 0.5m/s, the temperature is 50 ℃, and the soaking time is 48 hours.

(2) And (3) washing the soaked forming die by a high-pressure water gun with the working pressure of 12MPa, and adding 0.1 mass percent of magnetized abrasive in the washing water.

The magnetized abrasive is prepared from the following raw materials in parts by weight: 30 parts of garnet powder, 1 part of talcum powder, 16 parts of ferroferric oxide, 5 parts of nickel powder, 12 parts of silicon dioxide, 8 parts of zirconium oxide and 4 parts of calcium oxide.

(2) and (3) feeding the solidified material into a calcining furnace, calcining for 4 hours at 1100 ℃, naturally cooling to normal temperature after the calcining is finished, and crushing and ball-milling to obtain the magnetized abrasive material.

Example 3

(1) soaking a forming die for producing EPS foam plastic in an acid washing pool, wherein the solution of the acid washing pool is prepared from edible citric acid and water in a mass ratio of 2: 8, and also comprises 20mg/L of Tween and 20mg/L of polyacrylic acid, wherein the flow speed of the solution is 2.0m/s, the temperature is 70 ℃, and the soaking time is 24 hours.

(2) And (3) washing the soaked forming die by a high-pressure water gun with the working pressure of 15MPa, and adding 5.0 mass percent of magnetized abrasive in the washing water.

The magnetized abrasive is prepared from the following raw materials in parts by weight: 50 parts of garnet powder, 3 parts of talcum powder, 20 parts of ferroferric oxide, 8 parts of nickel powder, 16 parts of silicon dioxide, 10 parts of zirconium oxide and 6 parts of calcium oxide.

(2) and (3) feeding the solidified material into a calcining furnace, calcining for 2 hours at 1300 ℃, naturally cooling to normal temperature after the calcining is finished, and crushing and ball-milling to obtain the magnetized abrasive material.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for cleaning scale of a forming die for EPS foam production is characterized by comprising the following steps:

(1) soaking a forming die for EPS foam production in an acid washing pool;

(2) and washing the soaked forming die by a high-pressure water gun.

2. The method for cleaning the scale of the forming die for producing EPS foam plastic according to claim 1, wherein the solution of the pickling water tank is prepared from edible citric acid and water in a mass ratio of (1-2): (8-9) mixing and preparing.

3. The method for cleaning scale on a forming die for EPS foam production according to claim 2, wherein the solution in the pickling tank further comprises polyacrylic acid with a concentration of 20mg/L and 10mg/L to 20mg/L, wherein the concentration of the polyacrylic acid is 0.1mg/L to 0.3 mg/L.

4. The method for cleaning the scale of the forming die for EPS foam production according to claim 1, wherein a flowing solution is adopted in the acid washing water tank, the flowing speed is 0.5-2.0m/s, the solution temperature is 50-70 ℃, and the soaking time is 24-48 hours.

5. The method for cleaning the scale of the forming die for EPS foam molding production according to claim 1, wherein the working pressure of the high-pressure water gun is 12-15 MPa.

6. The method for cleaning the scale of the forming die for EPS foam molding production according to claim 1, wherein a magnetized abrasive material with the mass fraction of 0.1-5.0% is further added into the high-pressure water gun flushing water.

7. The method for cleaning the scale of the forming die for producing the EPS foam plastic as claimed in claim 6, wherein the magnetized abrasive is prepared from the following raw materials in parts by weight: 30-50 parts of garnet powder, 1-3 parts of talcum powder, 16-20 parts of ferroferric oxide, 5-8 parts of nickel powder, 12-16 parts of silicon dioxide, 8-10 parts of zirconium oxide and 4-6 parts of calcium oxide.

8. The method for cleaning the scale of the forming die for producing the EPS foam plastic according to claim 7, wherein the magnetized abrasive material is prepared from the following raw materials in percentage by mass: 40 parts of garnet powder, 2 parts of talcum powder, 18 parts of ferroferric oxide, 6 parts of nickel powder, 14 parts of silicon dioxide, 9 parts of zirconium oxide and 5 parts of calcium oxide.

9. The method for cleaning scale on a forming die for EPS foam production according to any one of claims 6, 7 and 8, wherein the preparation method of the magnetized abrasive material comprises the following steps:

10. The method for cleaning scale on a forming mold for EPS foam molding production as claimed in claim 9, wherein the calcination temperature in step 2 is 1100-1300 ℃ for 2-4 hours.