Preparation method of environment-friendly degradable sponge

Abstract

The invention provides a preparation method of environment-friendly degradable sponge, which is applied to the field of sponge production and comprises the following steps: S1, weighing a certain amount of nano cellulose, adding the nano cellulose into a reactor, replacing air in the reactor with nitrogen, controlling the internal pressure of the reactor to be 22-28kpa, introducing organosilane steam, heating to 60-80 DEG C, reacting for 3-6 hours, and cooling to room temperature; the hydrophobic modified nano cellulose is obtained; s2, adding a guar gum hydroxypropyl trimethyl ammonium chloride aqueous solution, fully mixing and stirring, and finally adding a mildew preventive, boric acid and glycerol to obtain a mixed solution; s3, adding a foaming agent into the obtained mixed solution, stirring and foaming for 2-3 hours to obtain a foaming solution, and introducing the foaming solution into a mold for foaming and shaping to obtain a sponge block; s4, a plurality of grooves are formed in the surface of the sponge block in a hot melting mode, and degradation balls are placed in the grooves; and S5, a corresponding groove is formed in the surface of the other sponge block through hot melting, and the two sponge blocks are spliced and subjected to hot melting to form the whole sponge.

Description

Technical Field

[0001] The present application relates to the field of sponge production, and in particular to a method for preparing an environmentally friendly and degradable sponge. Background Art

[0002] The commonly used sponges are made of wood cellulose fibers or foamed plastic polymers. In addition, there are also natural sponges made from sponge animals, most of which are used for body cleaning or painting. In addition, there are three types of synthetic sponges made of other materials, namely low-density polyether (non-absorbent sponge), polyvinyl alcohol (highly absorbent material without obvious pores) and polyester.

[0003] With the improvement of environmental awareness, people began to pay attention to the problem of environmental pollution caused by discarded sponges, and degradable sponges began to enter the public eye. This type of sponge can decompose into environmentally harmless products under specific conditions, but it cannot achieve the degradation rate shown in artificial environments in natural environments.

[0004] In this regard, we proposed a method for preparing an environmentally friendly and degradable sponge to solve the above problems. Summary of the invention

[0005] The purpose of this application is to increase the degradation rate of a degradable sponge in a natural environment. Compared with the prior art, a method for preparing an environmentally friendly degradable sponge is provided, which comprises the following steps:

[0006] S1: Weigh a certain amount of nanocellulose, add it into a reactor, replace the air in the reactor with nitrogen, control the internal pressure of the reactor at 22-28 kPa, introduce organic silane steam, heat to 60-80°C, react for 3-6 hours, and obtain hydrophobically modified nanocellulose;

[0007] S2: adding hydrophobically modified nanocellulose to a sodium hydroxide solution, randomly adding water to dilute to a mass fraction of 6-10%, then adding a guar gum hydroxypropyltrimethylammonium chloride aqueous solution, mixing and stirring thoroughly, and finally adding a mildew inhibitor, boric acid and glycerin to obtain a mixed solution;

[0008] S3: adding a foaming agent to the obtained mixed solution, stirring and foaming for 2 to 3 hours to obtain a foaming liquid, and introducing the foaming liquid into a mold for foaming and shaping to obtain a sponge block;

[0009] S4: hot-melting a plurality of grooves on the surface of the sponge block, and placing degradation balls in the grooves;

[0010] S5: Heat-melt the surface of another sponge block to form corresponding grooves, and then heat-melt the two sponge blocks together to form a whole sponge.

[0011] By using hydrophobically modified nanocellulose as a green, environmentally friendly and degradable material with good degradation ability, it can degrade naturally after being discarded, reducing pollution to the environment. The degradation balls are used to automatically decompose in the natural environment to release degrading microorganisms, which accelerates the degradation of the sponge blocks and effectively improves the ability to protect the environment.

[0012] Furthermore, after the foaming liquid is introduced into the mold, it is cooled for 10-12 hours.

[0013] Furthermore, the concentration of the guar gum hydroxypropyltrimethylammonium chloride aqueous solution is 3-6%.

[0014] Furthermore, the degradation ball includes a microbial decomposition shell, an attachment ball is arranged inside the microbial decomposition shell, and the attachment ball is made of porous silica gel material. Degradation microorganisms are attached to the attachment ball. The microbial decomposition shell can be gradually decomposed under the action of external microorganisms to expose the attachment ball. The porous silica gel material can absorb a large number of degradation microorganisms. After the attachment ball is exposed, the degradation microorganisms inside it are activated after contacting with water, thereby accelerating the degradation of the sponge block.

[0015] Furthermore, the degrading microorganisms are in a dry sleep state, which helps to prolong the survival time of the degrading microorganisms.

[0016] Furthermore, the outer layer of the microbial decomposition shell is provided with a cracking shell, and a drying layer is provided between the microbial decomposition shell and the cracking shell.

[0017] Furthermore, the microbial decomposition shell is made of polycaprolactone material, the decomposition time of the cracking shell is the same as the service life of the sponge block, and a plurality of etching marks are provided on the surface of the cracking shell.

[0018] Furthermore, the dry layer is woven from natural fiber materials.

[0019] Compared with the prior art, the advantages of this application are:

[0020] 1. By using hydrophobically modified nanocellulose as a green, environmentally friendly and degradable material, it has good degradation ability and can be naturally degraded after being discarded, reducing pollution to the environment. The degradation balls are automatically decomposed in the natural environment to release degrading microorganisms, which accelerates the degradation of the sponge block and effectively improves the ability to protect the environment.

[0021] 2. The microbial decomposition shell can be gradually decomposed under the action of external microorganisms, exposing the attached balls inside. The porous silica gel material can absorb a large number of degrading microorganisms. After the attached balls are exposed, the degrading microorganisms inside are activated after contacting with water, thereby accelerating the degradation of the sponge block. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1The preparation flow chart of this application;

[0023] Figure 2 This is a schematic diagram of the structure of the joint between the sponge block and the degradation ball of the present application;

[0024] Figure 3 This is a partial cross-sectional view of the degradation ball of the present application.

[0025] Description of the numbers in the figure:

[0026] 1. Sponge block, 2. Degradation ball, 21. Cracking shell, 22. Microbial decomposition shell, 23. Attachment ball. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal connection of the adapter model component. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Embodiment 1:

[0031] The present invention provides a method for preparing an environmentally friendly and degradable sponge. Figure 1 , a method for preparing a degradable sponge comprises the following steps:

[0032] S1: Weigh a certain amount of nanocellulose, add it into a reactor, replace the air in the reactor with nitrogen, control the internal pressure of the reactor at 22-28 kPa, introduce organic silane steam, heat to 60-80°C, react for 3-6 hours, and obtain hydrophobically modified nanocellulose;

[0033] S2: adding hydrophobically modified nanocellulose to a sodium hydroxide solution, randomly adding water to dilute to a mass fraction of 6-10%, then adding a guar gum hydroxypropyltrimethylammonium chloride aqueous solution, mixing and stirring thoroughly, and finally adding a mildew inhibitor, boric acid and glycerin to obtain a mixed solution;

[0034] S3: adding a foaming agent to the obtained mixed solution, stirring and foaming for 2 to 3 hours to obtain a foaming liquid, and introducing the foaming liquid into a mold for foaming and shaping to obtain a sponge block 1;

[0035] S4: hot-melting a plurality of grooves on the surface of the sponge block 1, and placing the degradation balls 2 in the grooves;

[0036] S5: hot-melt the surface of another sponge block 1 to form corresponding grooves, and hot-melt the two sponge blocks 1 together to form a sponge whole.

[0037] Specifically, by using hydrophobically modified nanocellulose as a green, environmentally friendly and degradable material with good degradation ability, it can be naturally degraded after being discarded, reducing pollution to the environment. The degradation ball 2 is automatically decomposed in the natural environment to release degrading microorganisms, thereby accelerating the degradation of the sponge block 1 and effectively improving the environmental protection ability.

[0038] After the foaming liquid is introduced into the mold, it is cooled for 10-12 hours. The cooling is helpful for the sponge block 1 to be formed and fixed.

[0039] The concentration of the guar hydroxypropyltrimonium chloride aqueous solution is 3-6%.

[0040] The degradation ball 2 comprises a microbial decomposition shell 22 , and an attachment ball 23 is arranged inside the microbial decomposition shell 22 . The attachment ball 23 is made of porous silica gel material, and degradation microorganisms are attached to the attachment ball 23 .

[0041] Specifically, the microbial decomposition shell 22 can be gradually decomposed under the action of external microorganisms, exposing the attached balls 23 therein. The porous silica gel material can absorb a large number of degrading microorganisms. After the attached balls 23 are exposed, the degrading microorganisms inside are activated after contacting with moisture, thereby accelerating the degradation of the sponge block 1.

[0042] The degrading microorganisms are in a dry dormant state, which helps to prolong the survival time of the degrading microorganisms.

[0043] The microbial decomposition shell 22 is covered with a cracking shell 21 , and a drying layer is arranged between the microbial decomposition shell 22 and the cracking shell 21 .

[0044] The microbial decomposition shell 22 is made of polycaprolactone material. The decomposition time of the cracking shell 21 is the same as the service life of the sponge block 1. There are multiple etching marks on the surface of the cracking shell 21. The polycaprolactone material can be decomposed into harmless products under the action of microorganisms. The number of etching marks on the surface of the cracking shell 21 can be increased to control the surface area contacting the air, thereby adjusting the oxidation rate of the cracking shell 21 and controlling its decomposition time.

[0045] The drying layer is woven from natural fiber materials, and the drying layer can absorb trace moisture that passes through the cracking shell 21, thereby effectively preventing the degrading microorganisms in the dry sleeping state from being activated prematurely.

[0046] The above is only the best implementation method adopted by this application in combination with current actual needs, but the protection scope of this application is not limited to this.

Claims

1. A method for preparing an environmentally friendly and degradable sponge, characterized in that: The following steps are involved: S1: Weigh a certain amount of nanocellulose, add it into a reactor, replace the air in the reactor with nitrogen, control the internal pressure of the reactor at 22-28 kPa, introduce organic silane steam, heat to 60-80°C, react for 3-6 hours, and obtain hydrophobically modified nanocellulose; S2: adding hydrophobically modified nanocellulose to a sodium hydroxide solution, randomly adding water to dilute to a mass fraction of 6-10%, then adding a guar gum hydroxypropyltrimethylammonium chloride aqueous solution, mixing and stirring thoroughly, and finally adding a mildew inhibitor, boric acid and glycerin to obtain a mixed solution; S3: adding a foaming agent to the obtained mixed solution, stirring and foaming for 2 to 3 hours to obtain a foaming liquid, and introducing the foaming liquid into a mold for foaming and shaping to obtain a sponge block (1); S4: hot-melting a plurality of grooves on the surface of the sponge block (1), and placing the degradation balls (2) in the grooves; S5: hot-melt the surface of another sponge block (1) to form corresponding grooves, and hot-melt the two sponge blocks (1) together to form a sponge whole.

2. The method for preparing an environmentally friendly and degradable sponge according to claim 1, characterized in that: After the foaming liquid is introduced into the mold, it is cooled for 10-12 hours.

3. The method for preparing an environmentally friendly and degradable sponge according to claim 1, characterized in that: The concentration of the guar gum hydroxypropyltrimethylammonium chloride aqueous solution is 3-6%.

4. The method for preparing an environmentally friendly and degradable sponge according to claim 1, characterized in that: The degradation ball (2) comprises a microbial decomposition shell (22), an attachment ball (23) is arranged inside the microbial decomposition shell (22), and the attachment ball (23) is made of porous silica gel material, and degradation microorganisms are attached to the inside of the attachment ball (23).

5. The method for preparing an environmentally friendly and degradable sponge according to claim 4, characterized in that: The degrading microorganisms are in a dry dormant state.

6. The method for preparing an environmentally friendly and degradable sponge according to claim 4, characterized in that: The microbial decomposition shell (22) is covered with a cracking shell (21) on its outer layer, and a drying layer is provided between the microbial decomposition shell (22) and the cracking shell (21).

7. The method for preparing an environmentally friendly and degradable sponge according to claim 6, characterized in that: The microbial decomposition shell (22) is made of polycaprolactone material, the decomposition time of the pyrolysis shell (21) is the same as the service life of the sponge block (1), and a plurality of etching marks are provided on the surface of the pyrolysis shell (21).

8. The method for preparing an environmentally friendly and degradable sponge according to claim 5, characterized in that: The dry layer is woven from natural fiber materials.

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