CN115703289A

CN115703289A - Polyurethane foam product and preparation method of polyurethane foam

Info

Publication number: CN115703289A
Application number: CN202110909462.5A
Authority: CN
Inventors: 徐结明; 唐耀州
Original assignee: SHANGHAI ISO MEDICAL PRODUCTS CO Ltd
Current assignee: SHANGHAI ISO MEDICAL PRODUCTS CO Ltd
Priority date: 2021-08-09
Filing date: 2021-08-09
Publication date: 2023-02-17

Abstract

The invention discloses a polyurethane foam product and a preparation method of polyurethane foam, wherein the polyurethane foam product contains uniformly distributed gaps, and the diameter of each gap is between 5 and 30 micrometers. The polyurethane foam product provided by the invention has the advantages that the diameter of the gap is between 5 and 30 micrometers, the introduction coefficient is lower, and the heat preservation and cold insulation performance is better. The preparation method of the polyurethane foam provided by the invention can control the aperture of the generated polyurethane foam to be between 5 and 30 microns, has good uniformity and excellent opening performance, can obtain the polyurethane foam with better latex feel and comfortable feeling, and can effectively reduce the production cost while ensuring the production efficiency.

Description

Polyurethane foam product and preparation method of polyurethane foam

Technical Field

The invention relates to the field of medical instruments and preparation of new materials, in particular to a polyurethane foam product and a preparation method of polyurethane foam.

Background

The polyurethane foam is a novel synthetic material with heat preservation and waterproof functions, has lower heat conductivity coefficient, and is mainly applied to the heat preservation of the outer wall of a building, the integration of roof waterproof and heat preservation, the heat preservation and insulation of a refrigeration house, a pipeline heat preservation material, a building plate, a refrigerator car, a refrigeration house heat insulation material and the like. In recent years, polyurethane foams have also become more widely used in the field of medical devices. In one aspect, prior art polyurethane foams have relatively large void diameters, typically between 100 and 350 microns; on the other hand, in the prior art, the processing technology of the polyurethane foam is complex, and the production cost is high.

Disclosure of Invention

The invention aims to provide a polyurethane foam product and a preparation method of polyurethane foam.

The polyurethane foam product provided by the invention contains uniformly distributed voids, and the diameter of the voids is between 5 and 30 micrometers.

The polyurethane foam product is a rectangular plate-shaped structure with a thickness of 3 cm. The polyurethane foam article includes a tubular structure (1) made of polyurethane foam. The polyurethane foam product provided by the invention is also provided with a hard inner wall pipe (2) and a hard outer wall pipe (3); stereoplasm inner wall pipe (2) with stereoplasm outer wall pipe (3) coaxial arrangement and have the annular space between the two, tubular structure (1) that polyurethane foam made presss from both sides and establishes in the annular space between stereoplasm inner wall pipe (2) and stereoplasm outer wall pipe (3). The axial length of the hard inner wall pipe (2) is greater than that of the hard outer wall pipe (3); the thickness of the hard inner wall pipe (2) is between 2 mm and 3 mm; the thickness of the hard outer wall pipe (3) is 0.8 mm to 1 mm.

The preparation method of the polyurethane foam provided by the invention comprises the following steps: s1, mixing the polyurethane prepolymer with a water-phase material to form a prefabricated mixed solution; s2, performing foaming treatment on the prefabricated mixed solution to perform foaming reaction so as to generate foamed cotton; and S3, drying the foaming cotton to obtain polyurethane foam.

The S1 is used for mixing the polyurethane prepolymer and the water-phase material to form a prefabricated mixed liquid, and the mixing mass ratio of the polyurethane prepolymer to the water-phase material is 1:1 to 0.4. The step S1 is used for mixing the polyurethane prepolymer with the water-phase material to form a prefabricated mixed liquid, and the step S also comprises a step of stirring the prefabricated mixed liquid at a high speed by using a high-speed stirring instrument; the step of stirring the prefabricated mixed solution at a high speed by using a high-speed stirring instrument is carried out under the condition of sealing and isolating air; and the step of stirring the prefabricated mixed solution at a high speed by using a high-speed stirring instrument, wherein the stirring speed is 3000 rpm to 5000 rpm. The preparation method comprises the following steps of S1, mixing a polyurethane prepolymer with a water-phase material to form a prefabricated mixed liquid, wherein the temperature of the polyurethane prepolymer is 25-35 ℃, and the temperature of the water-phase material is 0-10 ℃; s2, performing foaming treatment on the prefabricated mixed solution to perform foaming reaction so as to generate foamed cotton, wherein the foaming treatment temperature is 25-60 ℃; and S3, drying the foamed cotton to obtain polyurethane foam, wherein the drying temperature is 100-150 ℃. The polyurethane prepolymer is prepared by reacting toluene diisocyanate with polyether polyol; the water phase material is formed by mixing water, a surfactant, a foam stabilizer and a pore forming agent; the surfactant is an organic silicon surfactant; the foam stabilizer adopts ethylene oxide polymer; the pore former is one, two or three of organic silicon polymer, micro silica gel powder or propylene oxide ethylene propylene glycol ether.

The polyurethane foam product provided by the invention has the advantages that the diameter of the gap is between 5 and 30 micrometers, the introduction coefficient is lower, and the heat preservation and cold insulation performance is better. The preparation method of the polyurethane foam provided by the invention can control the aperture of the generated polyurethane foam to be between 5 and 30 microns, has good uniformity and excellent opening performance, can obtain the polyurethane foam with better latex feel and comfortable feeling, and can effectively reduce the production cost while ensuring the production efficiency.

Drawings

FIG. 1 is a schematic structural view of a polyurethane foam article according to a first embodiment of the present invention;

FIG. 2 is a schematic representation of the steps of a method of making a polyurethane foam according to example two of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Example one

This embodiment provides a polyurethane foam article having uniformly distributed voids therein, the voids having a diameter of between 5 microns and 30 microns. As will be appreciated by those skilled in the art, the pore size of the polyurethane foam article is set to be between 5 microns and 30 microns, which allows the polyurethane foam article to have better thermal insulation properties for use in medical devices with higher thermal or cold insulation requirements.

Further, the polyurethane foam article provided in this example is a rectangular plate-like structure having a thickness of 3 cm. It will be appreciated by those skilled in the art that the polyurethane foam provided in this embodiment is cut into 3 cm rectangular sheets for easy transportation, stacking and storage, and for subsequent processing and use.

Further, the present embodiment provides a polyurethane foam article including a tubular structure 1 made of polyurethane foam. It will be appreciated by those skilled in the art that the polyurethane foam tubular structure 1 can be used as an insulating pipe for medical instruments or medical equipment.

Further, the polyurethane foam product provided by the embodiment is also provided with a hard inner wall pipe 2 and a hard outer wall pipe 3; the hard inner wall pipe 2 and the hard outer wall pipe 3 are coaxially arranged, an annular gap is formed between the hard inner wall pipe 2 and the hard outer wall pipe 3, and the tubular structure 1 made of polyurethane foam is clamped in the annular gap between the hard inner wall pipe 2 and the hard outer wall pipe 3. As will be understood by those skilled in the art, by providing hard pipes on the inner wall side and the outer wall side of the tubular structure 1 made of polyurethane foam, a medium to be heat-insulated, such as a liquid, can be directly placed in the inner pipe; the hard outer wall pipe 3 can protect the tubular structure 1 made of polyurethane foam, and prevent the tubular structure from being deformed and damaged by external environment collision, scraping, cutting and the like.

Further, the axial length of the hard inner wall tube 2 is greater than that of the hard outer wall tube 3. It will be appreciated by those skilled in the art that the hard inner-wall tube 2 thus protrudes from the hard outer-wall tube 3 and the hard outer-wall tube 3 to facilitate assembly.

Further, the thickness of the hard inner wall tube 2 is between 2 mm and 3 mm. It will be appreciated by those skilled in the art that the provision of the rigid inner-wall tube 2 with a thickness of between 2 mm and 3 mm ensures that the rigid inner-wall tube 2 is both lightweight and inexpensive to manufacture.

Further, the thickness of the hard outer-wall tube 3 is between 0.8 mm and 1 mm. It will be appreciated by those skilled in the art that setting the thickness of the hard outer-wall tube 3 to between 0.8 mm and 1 mm ensures both a use requirement and a low weight and a low manufacturing cost of the hard outer-wall tube 3.

Example two

This example provides a method for preparing a polyurethane foam, comprising the steps of:

s1, mixing the polyurethane prepolymer with a water-phase material to form a prefabricated mixed solution;

s2, performing foaming treatment on the prefabricated mixed liquid to perform foaming reaction so as to generate foamed cotton;

and S3, drying the foamed cotton to obtain polyurethane foam.

Further, in the step of mixing the polyurethane prepolymer and the water phase material to form the prefabricated mixed liquid, the mixing mass ratio of the polyurethane prepolymer to the water phase material is 1: between 1 and 0.4. As can be understood by those skilled in the art, the mixing mass ratio of the polyurethane prepolymer to the water-phase material is 1: from 1 to 0.4, the pore size of the voids within the resulting polyurethane foam can be controlled to be between 5 microns and 30 microns.

Further, the step S1 is used for mixing the polyurethane prepolymer and the water phase material to form a prefabricated mixed liquid, and the step S also comprises a step of stirring the prefabricated mixed liquid at a high speed by using a high-speed stirring instrument. As will be appreciated by those skilled in the art, this increases the uniformity of the pre-mix solution, resulting in a more uniform and consistent quality of the resulting foamed web.

Further, the step of stirring the prefabricated mixed liquid at a high speed by using a high-speed stirring instrument is carried out under the condition of sealing and isolating air. As can be understood by those skilled in the art, high-speed stirring under the condition of airtight and air-isolated can prevent air from mixing in the stirring process to form bubbles, so that uneven foaming is caused, the uniformity of the internal structure of the produced polyurethane foam is poor, and the heat-insulating property is poor.

Further, the step of stirring the pre-prepared mixed solution at a high speed by using a high-speed stirring instrument, wherein the stirring speed is 3000 rpm to 5000 rpm.

Further, the S1 is used for mixing the polyurethane prepolymer and the water-phase material to form a prefabricated mixed liquid, wherein the temperature of the polyurethane prepolymer is 25-35 ℃, and the temperature of the water-phase material is 0-10 ℃.

Further, the step S2 is used for carrying out foaming treatment on the prefabricated mixed liquid to enable the prefabricated mixed liquid to carry out foaming reaction, so that foamed cotton is generated, and the temperature of the foaming treatment is 25-60 ℃. As can be understood by those skilled in the art, the temperature of the foaming process is set to be between 25 ℃ and 60 ℃, which can ensure the foaming effect, the pore size is controlled to be between 5 micrometers and 30 micrometers, the foaming process can be ensured to have a shorter time, and the higher production efficiency can be ensured.

Further, in the step S3, the drying temperature is between 100 ℃ and 150 ℃ in the step of drying the foamed sponge to obtain the polyurethane foam. As can be understood by those skilled in the art, the drying temperature is set between 100 ℃ and 150 ℃, so that the drying time is short and the production efficiency is high on the premise of ensuring the drying effect.

Further, the S1 is used in the step of mixing the polyurethane prepolymer and the water phase material to form a pre-prepared mixed solution, and the polyurethane prepolymer may be prepared by reacting Toluene Diisocyanate (TDI) and polyether polyol.

Furthermore, the water phase material is formed by mixing water, a surfactant, a foam stabilizer and a pore-forming agent.

Further, the surfactant may employ a silicone surfactant.

Further, an ethylene oxide polymer may be used as the foam stabilizer.

Further, the cell opener can adopt one, two or three of organic silicon polymer, micro silica gel or propylene oxide ethylene propylene glycol ether (KF-28). It will be appreciated by those skilled in the art that the silicone polymers are also known as polysiloxanes, or polysilicones. Organosilicon polymers are polymers having carbon side chains attached to the Si atom. The silicone polymer is in a liquid, semi-solid or solid state depending on its molecular weight. Silicone polymers in their form and useThe silicone rubber can be divided into three categories, namely silicone oil, silicone resin and silicone rubber. The silicone oil is an oily liquid with a linear structure prepared by hydrolytic polycondensation of monofunctional group and bifunctional group such as methyl, ethyl or phenyl chlorosilane and the like. The silicone resin is a linear polymer generated by a prepolymer hydrolyzed by bifunctional and trifunctional monomers according to a certain proportion, and can be subjected to cross-linking curing reaction to form the thermosetting silicone resin with a net-shaped three-dimensional structure. The silicon rubber is prepared by carrying out hydrolytic polycondensation on an extremely pure bifunctional monomer, and has an average molecular weight of

Is of a linear structure. The polysiloxane which is liquid, solid or elastomer has high electric insulation, water repellency, heat resistance and cold resistance. As will be appreciated by those skilled in the art, aerosil is a white powder inorganic chemical product. The micro silica gel powder is non-toxic, tasteless, non-inflammable, non-explosive, non-volatile, non-corrosive, large in pore volume and strong in surface activity. The micro silica gel powder has stable chemical property and is insoluble in water. As can be understood by those skilled in the art, the pore-forming agent can enable the polyurethane foam generated by the implementation to have higher resilience, effectively increase the latitude of the foaming process, have excellent pore-forming property, prevent closed pores, effectively improve the polyurethane foam structure, and effectively improve the latex feeling and comfort of the polyurethane foam material.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A polyurethane foam article characterized by a uniform distribution of voids within said polyurethane foam article, said voids having a diameter of between 5 microns and 30 microns.

2. The polyurethane foam article of claim 1, wherein the polyurethane foam article is a rectangular slab-like structure having a thickness of 3 centimeters.

3. A polyurethane foam article as claimed in claim 1 wherein the polyurethane foam article comprises a tubular structure (1) of polyurethane foam.

4. Polyurethane foam article according to claim 3, characterised in that it is further provided with a rigid inner-wall tube (2) and a rigid outer-wall tube (3); the hard inner wall pipe (2) and the hard outer wall pipe (3) are coaxially arranged, an annular gap is formed between the hard inner wall pipe and the hard outer wall pipe, and the tubular structure (1) made of polyurethane foam is clamped in the annular gap between the hard inner wall pipe (2) and the hard outer wall pipe (3).

5. The polyurethane foam article as claimed in claim 4, wherein the rigid inner-wall tube (2) has an axial length greater than an axial length of the rigid outer-wall tube (3); the thickness of the hard inner wall pipe (2) is between 2 mm and 3 mm; the thickness of the hard outer wall pipe (3) is 0.8 mm to 1 mm.

6. A preparation method of polyurethane foam is characterized by comprising the following steps:

and S3, drying the foamed cotton to obtain polyurethane foam.

7. The method for preparing polyurethane foam according to claim 6, wherein the step S1 of mixing the polyurethane prepolymer and the water phase material to form a pre-mixed solution comprises the following steps of mixing the polyurethane prepolymer and the water phase material in a mass ratio of 1:1 to 0.4.

8. The method of preparing polyurethane foam according to claim 7, wherein the step S1 of mixing the polyurethane prepolymer with the aqueous phase material to form the preliminary mixture further comprises a step of stirring the preliminary mixture at a high speed using a high-speed stirring device; the step of stirring the prefabricated mixed solution at a high speed by using a high-speed stirring instrument is carried out under the condition of sealing and isolating air; and the step of stirring the prefabricated mixed solution at a high speed by using a high-speed stirring instrument, wherein the stirring speed is 3000 revolutions per minute to 5000 revolutions per minute.

9. The method for preparing polyurethane foam according to claim 8, wherein the step S1 is performed by mixing the polyurethane prepolymer and the aqueous phase material to form a pre-prepared mixture, wherein the temperature of the polyurethane prepolymer is between 25 ℃ and 35 ℃, and the temperature of the aqueous phase material is between 0 ℃ and 10 ℃; s2, performing foaming treatment on the prefabricated mixed liquid to perform foaming reaction so as to generate foamed cotton, wherein the foaming treatment temperature is 25-60 ℃; and S3, drying the foamed cotton to obtain polyurethane foam, wherein the drying temperature is 100-150 ℃.

10. The method of preparing polyurethane foam according to claim 9, wherein the polyurethane prepolymer is prepared by reacting toluene diisocyanate with polyether polyol; the water phase material is formed by mixing water, a surfactant, a foam stabilizer and a pore forming agent; the surfactant is an organic silicon surfactant; the foam stabilizer adopts an ethylene oxide polymer; the pore former is one, two or three of organic silicon polymer, micro silica gel powder or propylene oxide ethylene propylene glycol ether.