Preparation process of endoscope cleaning foam box

Abstract

The invention discloses a preparation process of an endoscope cleaning foam box, and particularly relates to the technical field of endoscope cleaning foam box preparation, and the preparation process comprises the following steps: step 1, preparing a PU foaming material by adopting a supercritical CO-assisted water foaming technology, in the supercritical CO-assisted water foaming technology, taking CO as a foaming agent, and taking the PU foaming material as a foaming agent; the polymer has good solubility and diffusivity in a supercritical state, and can be uniformly distributed in a polyurethane system; secondly, an endoscope cleaning foam box mold is preheated; 3, a release agent A is smeared in the endoscope cleaning foam box mold; and 4, a release agent B is sprayed into the endoscope cleaning foam box mold. According to the invention, COs are used as a foaming agent, so that the use of a traditional foaming agent is reduced, a low-VOC polyurethane microporous high-resilience material is used as a foaming raw material, and a mixture of premixed polyether polyol and modified isocyanate is used for reducing the use amount of isocyanate, so that the influence on the environment is reduced, and environmental protection is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of preparation of an endoscope cleaning foam box, and more specifically to a preparation process of an endoscope cleaning foam box. Background Art

[0002] Endoscope cleaning foam box is a tool specially used for cleaning endoscopes. In the medical field, endoscopes are used frequently, so they need to be cleaned and disinfected regularly to ensure their long-term stable operation. Cleaning foam boxes usually contain a variety of professional brushes and cleaning cotton swabs suitable for endoscope working channels, rigid instruments, endoscope valves, external cleaning, etc., ensuring that every detail can be perfectly cleaned and providing comprehensive protection for endoscope equipment.

[0003] Endoscope cleaning foam boxes are usually processed by foaming technology. Foaming technology is a technology that forms a microporous structure by injecting gas (such as carbon dioxide, nitrogen, etc.) into the material during the processing of plastics, rubber and other materials. This technology can significantly reduce the weight of the material while giving the material good cushioning, shock absorption, sound absorption and thermal insulation properties. The basic principle of foaming technology is to evenly mix the gas into the material in the molten state, and then reduce the pressure or increase the temperature to form tiny bubbles in the material. These bubbles are retained after the material cools and solidifies to form a microporous structure. Foaming technology can be divided into physical foaming and chemical foaming. Physical foaming is to foam the material by physical methods (such as injecting gas), while chemical foaming is to generate gas through chemical reactions. Foaming technology is widely used in packaging, construction, automobiles, electronics, medical and other fields.

[0004] At present, conventional foaming technology may use environmentally harmful foaming agents, such as low-boiling liquids such as chlorofluorocarbons or hydrocarbons, which may damage the ozone layer and affect the surrounding environment. Some foaming processes also use cyclopentane foaming agents such as a polyurethane foam material and its foaming process disclosed in the prior art CN113563555A. Although the cyclopentane foaming agent has little impact on the environment, the solubility of cyclopentane in polyols is poor, especially phthalic anhydride polyester polyols, which imposes certain restrictions on the amount of cyclopentane added.

[0005] The isocyanate used in the polyurethane foaming in the prior art CN113563555A has a pungent odor and irritating effect, which is irritating to human skin and eyes. In addition, volatile organic compounds that pollute the environment are also produced during the production process of isocyanate. In other words, the use of isocyanate in this process is not conducive to environmental protection. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a preparation process for an endoscope cleaning foam box, by using CO2 as a foaming agent to reduce the use of traditional foaming agents, using low-VOC polyurethane microporous high-resilient material as a foaming raw material, and using a combination of polyether and modified isocyanate mixture to reduce the use of isocyanate, thereby reducing the impact on the environment, which is beneficial to environmental protection, so as to solve the problems arising from the above-mentioned background technology.

[0007] The present invention provides a preparation process of an endoscope cleaning foam box, comprising the following steps: Step 1: Prepare PU foam material by supercritical CO2-assisted water foaming technology. In supercritical CO2-assisted water foaming technology, CO2 is used as a foaming agent. It has good solubility and diffusivity in a supercritical state and can be evenly distributed in the polyurethane system. Step 2: Preheat the endoscope cleaning foam box mold; Step 3: Apply release agent A to the endoscope cleaning foam box mold; Step 4: Spray release agent B into the endoscope cleaning foam box mold; Step 5: spray the inner paint into the endoscope cleaning foam box mold; Step 6: pouring the PU foam material prepared in step 1 into the endoscope cleaning foam box mold, and then closing the mold, and subjecting the PU foam material to a aging treatment to completely solidify the PU foam material in the endoscope cleaning foam box mold; Step 7: After cooling, the mold is opened and the formed endoscope cleaning foam box blank is taken out; Step 8: inspect the endoscope cleaning foam box blanks, and perform edge trimming, trimming, and hole repairing on the endoscope cleaning foam box blanks that pass the inspection; Step nine, print the logo on the endoscope cleaning foam box blank, stick the dust-free wiping cloth, stick the machine, and obtain the finished endoscope cleaning foam box after another inspection.

[0008] In a preferred embodiment, the raw materials of the PU foam material in step 1 include a low-VOC polyurethane microporous high-resilience material, a combined polyether and a modified isocyanate mixture; The ratio of the low-VOC polyurethane microporous high-resilience material, the combined polyether and the modified isocyanate mixture is 100:40.

[0009] In a preferred embodiment, the ratio of the combined polyether to the modified isocyanate in the mixture of the combined polyether and the modified isocyanate is 1:1.25.

[0010] In a preferred embodiment, the raw material of the foaming material in step 1 further includes nano-scale fumed silica, and the addition amount of the nano-scale fumed silica is 1%-3%.

[0011] In a preferred embodiment, the release agent A used in step three is a solvent-free release agent.

[0012] In a preferred embodiment, the release agent B used in step 4 is a water-based environmentally friendly release agent.

[0013] In a preferred embodiment, the in-mold paint used in step 5 is a water-based in-mold paint, and a curing agent is added to the water-based in-mold paint at a mass percentage of 3%-5%; When using the water-based in-mold paint, the temperature of the endoscope cleaning foam box mold is maintained between 40°C and 60°C.

[0014] In a preferred implementation, the content printed in step nine includes a product logo, a power button logo, and an insert 5 seconds logo.

[0015] Technical effects and advantages of the present invention: 1. In view of the problems existing in the use of foaming agents in the existing foaming technology, the present invention utilizes supercritical CO2-assisted water foaming technology and uses CO2 as a foaming agent. Compared with traditional foaming agents, the CO2 used in the present invention is environmentally friendly and beneficial to environmental protection. Moreover, CO2 has good solubility and diffusivity in the supercritical state and can be evenly distributed in the polyurethane system.

[0016] 2. The present invention adopts low-VOC polyurethane microporous high-rebound material, which can also reduce the volatility and VOC emissions of the material, meeting environmental protection and health standards.

[0017] 3. The present invention adopts a combination of polyether and modified isocyanate mixture to replace the isocyanate used in the traditional foaming technology, thereby reducing the amount of isocyanate used and thus reducing the impact on the environment.

[0018] 4. The present invention adds nano-scale fumed silica to the foaming material, which can enhance the mechanical properties of the foaming material, improve its thermal stability, and strengthen its flame retardant properties. On the other hand, it can also accelerate the aging, improve the aging efficiency, and shorten the preparation time of the endoscope cleaning foam box. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1A flow chart of preparing an endoscope cleaning foam box according to an embodiment of the present invention; Figure 2 A schematic diagram of an endoscope cleaning foam box prepared according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the description of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] Unless otherwise clearly specified and limited, the terms "disposed", "installed", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0023] The directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0025] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0026] Refer to the instruction manual Figure 1 The present invention provides a preparation process of an endoscope cleaning foam box, comprising the following steps: Step 1: Prepare PU foam material using supercritical CO2-assisted water foaming technology. The specific process is as follows: S1.1: Add PU (polyurethane) foaming raw materials into an autoclave, wherein the added raw materials include low-VOC (volatile organic compounds) polyurethane microporous high-resilience material, a combination of polyether and modified isocyanate mixture, and nano-grade fumed silica, wherein the addition amount of the nano-grade fumed silica is 1%-3%; The ratio of the low-VOC polyurethane microporous high-resilience material, the combined polyether and the modified isocyanate mixture is 100:40, and the ratio of the combined polyether and the modified isocyanate in the combined polyether and modified isocyanate mixture is 1:1.25; by adding the combined polyether and modified isocyanate mixture to replace the isocyanate used in the traditional foaming technology, on the one hand, the usage of isocyanate can be reduced, and the impact of the present invention on the environment can be reduced; on the other hand, the weather resistance, wear resistance, chemical corrosion resistance, etc. of the polyurethane material can be improved by the modified isocyanate.

[0027] In the polyurethane foaming process, combined polyethers and modified isocyanates are usually used as a two-component system. The combined polyether is the A component and the modified isocyanate is the B component. When these two components are mixed, they react chemically to form polyurethane foam. The advantage of this two-component system is that it can be mixed on site, which makes it easy to control the reaction speed and the foam formation process.

[0028] The addition of nano-scale fumed silica during the polyurethane foaming process significantly changes the morphology of the cells in the polyurethane foam system, not only significantly reducing the cell diameter, increasing the number of cells, promoting heterogeneous nucleation, improving the cell morphology, but also increasing the open cell rate and average pore diameter. This change is conducive to enhancing the mechanical properties of the foaming material and obtaining a foaming material with higher strength.

[0029] S1.2: Supercritical carbon dioxide fluid is introduced into the reactor to make it swell and diffuse into the polymer matrix under high temperature and high pressure conditions. In this process, carbon dioxide fluid is used to replace the foaming agent in the traditional foaming technology, which further reduces the impact of the present invention on the environment; S1.3: Rapidly release pressure through the pressure relief valve to achieve microcellular foaming.

[0030] Step 2: Preheat the endoscope cleaning foam box mold; Step 3: Apply release agent A to the endoscope cleaning foam box mold. To achieve environmental protection, the release agent A is a solvent-free release agent. Solvent-free release agents are release agents that do not contain organic solvents and are usually compounded with polymers, waxes, emulsifiers, etc. They are environmentally friendly, non-toxic, odorless, safe to use, and have good isolation and demolding effects.

[0031] Step 4: Spray release agent B into the endoscope cleaning foam box mold. The release agent B used in this step is a water-based environmentally friendly release agent. A water-based release agent is a water-based release agent that does not contain organic solvents. Therefore, it does not release harmful gases during use and is environmentally friendly. For example, Beijing Zhubao MA-3000 concrete release agent is made of imported raw materials and additives. It is a new generation of water-based polymer environmentally friendly emulsion that is non-toxic, non-flammable, rust-proof, and friendly to the human body and the environment. The concrete surface after demoulding is high in smoothness and sharp in edges and corners, and does not affect the physical and chemical indicators such as concrete strength, and will not cause residual pollution.

[0032] Step 5. Spray the mold paint into the endoscope cleaning foam box mold. The mold paint used in this step is water-based mold paint. When using the water-based mold paint, the temperature of the endoscope cleaning foam box mold is maintained between 40°C and 60°C. Water-based mold paint is a coating sprayed inside the mold, mainly used to improve the appearance quality of the product and protect the product surface. It can effectively block the yellowing of the foaming material and cover the surface defects caused by the foaming process, such as sand holes, foaming lines, and mold lines. At the same time, it can truly reproduce the mold texture and improve the expressiveness of the product appearance. The water-based mold paint also has good wear resistance and flexibility, which can improve the surface wear resistance of the foaming material, and has good weather resistance and chemical resistance, and can resist the erosion of the external environment.

[0033] The water-based in-mold paint used contains 3%-5% by weight of a curing agent. The curing agent is mixed evenly with the in-mold paint before use, which can improve the strength of the paint film and make the paint film have better chemical resistance.

[0034] Step 6: pouring the PU foam material prepared in step 1 into the endoscope cleaning foam box mold, and then closing the mold, and subjecting the PU foam material to a aging treatment to completely solidify the PU foam material in the endoscope cleaning foam box mold; The nano-scale fumed silica added in the above step 1 can also improve the thermal conductivity of the foaming material, accelerate the aging process of this step, optimize the foam structure, and improve the aging efficiency, thereby shortening the time required for preparing the endoscope cleaning foam box of the present invention.

[0035] Step 7: After cooling, the mold is opened and the formed endoscope cleaning foam box blank is taken out; Step 8: inspect the endoscope cleaning foam box blanks, and perform edge trimming, trimming, and hole repairing on the endoscope cleaning foam box blanks that pass the inspection; Step 9: Print the product logo, power button logo, and insert 5seconds logo on the endoscope cleaning foam box blank, stick the dust-free wipe cloth, stick the machine, and then get the finished endoscope cleaning foam box after re-inspection. Figure 2 shown.

[0036] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A preparation process for an endoscope cleaning foam box, characterized in that: The following steps are involved: Step 1: Prepare PU foam material by supercritical CO2-assisted water foaming technology; Step 2: preheating the endoscope cleaning foam box mold; Step 3: Apply release agent A to the endoscope cleaning foam box mold; Step 4: Spray release agent B into the endoscope cleaning foam box mold; Step 5: spray the inner paint into the endoscope cleaning foam box mold; Step 6: pouring the PU foam material prepared in step 1 into the endoscope cleaning foam box mold, and then closing the mold, and subjecting the PU foam material to a aging treatment to completely solidify the PU foam material in the endoscope cleaning foam box mold; Step 7: After cooling, the mold is opened and the formed endoscope cleaning foam box blank is taken out; Step 8: inspect the endoscope cleaning foam box blanks, and perform edge trimming, trimming, and hole repairing on the endoscope cleaning foam box blanks that have passed the inspection; Step nine, print the logo on the endoscope cleaning foam box blank, stick the dust-free wiping cloth, stick the machine, and obtain the finished endoscope cleaning foam box after another inspection.

2. The preparation process of the endoscope cleaning foam box according to claim 1, characterized in that: The raw materials of the PU foam material in step 1 include a low-VOC polyurethane microporous high-resilience material, a combined polyether and a modified isocyanate mixture; The ratio of the low-VOC polyurethane microporous high-resilience material, the combined polyether and the modified isocyanate mixture is 100:

40.

3. The preparation process of the endoscope cleaning foam box according to claim 2, characterized in that: The ratio of the combined polyether to the modified isocyanate in the mixture of the combined polyether and the modified isocyanate is 1:1.

25.

4. The preparation process of the endoscope cleaning foam box according to claim 1, characterized in that: The raw material of the foaming material in step 1 also includes nano-scale fumed silica, and the addition amount of the nano-scale fumed silica is 1%-3%.

5. The preparation process of the endoscope cleaning foam box according to claim 1, characterized in that: The release agent A used in step 3 is a solvent-free release agent.

6. The preparation process of the endoscope cleaning foam box according to claim 1, characterized in that: The release agent B used in step 4 is a water-based environmentally friendly release agent.

7. The preparation process of the endoscope cleaning foam box according to claim 1, characterized in that: The in-mold paint used in step 5 is a water-based in-mold paint, to which a curing agent having a weight percentage of 3%-5% is added; When using the water-based in-mold paint, the temperature of the endoscope cleaning foam box mold is maintained between 40°C and 60°C.

8. The process for preparing an endoscope cleaning foam box according to claim 1, characterized in that: The content printed in step nine includes the product logo, power button logo, and insert 5 seconds logo.

Images