Dry and not hard cleaning cloth

Abstract

The invention belongs to the technical field of cleaning cloth, and particularly relates to dry and non-hard cleaning cloth, which is specifically prepared by the following steps: uniformly stirring wheat starch and clear water, and heating to about 75 DEG C in the stirring process to obtain starch paste a; heating and dissolving polyvinyl alcohol and clear water to form a solution b; adding a proper amount of formaldehyde solution into the solution b, and uniformly stirring to form a mixed solution c; mixing and stirring the starch paste a and the mixed solution c to form a mixed solution d; controlling the temperature range of the mixed solution d to be 30-50 DEG C, adding 6-8% of industrial hydrochloric acid or dilute sulphuric acid into the mixed solution d, and uniformly stirring to obtain a solution e; injecting the solution e into a specified mold container, heating to a temperature range of 70-90 DEG C, and waiting for a certain foaming reaction time to form the cleaning cloth; and cleaning the formed cleaning cloth to remove the residual wheat starch. The invention provides the cleaning cloth which is strong in integrity and is not hard after being dried.

Description

Technical Field

[0001] The present invention belongs to the technical field of cleaning cloths, and particularly refers to a cleaning cloth that does not become hard when dry. Background Art

[0002] Currently, there are various wiping cloths that can meet different purposes for cleaning. For example, there is a wiping cloth made of sponge material, which is relatively soft and can absorb a large amount of water. However, it is not easy to clean stubborn stains and is prone to leaving water marks. There is also a chamois leather towel wiping cloth on the market, which is made of PVA material. The wiping cloth made of PVA material has strong water absorption, so it has a good dirt absorption effect.

[0003] For example, a wiping cloth in Chinese Patent CN201420130309.8 includes a first PVA layer, an intermediate core layer, and a second PVA layer connected in sequence, and the first PVA layer, the intermediate core layer, and the second PVA layer are an integral whole; holes are provided on the first PVA layer, and the lower surface of the second PVA layer is smooth. This product has a good cleaning function for the formed wiping object by setting PVA layers on both sides of the intermediate core layer, but this product also has certain deficiencies: a. PVA is a foaming material that will become hard when dry. This patented product will become extremely hard and even deformed in the dry state, and it needs to be soaked in water for several minutes to soften before use, which greatly affects the use; b. PVA is a foaming material, and it is difficult to connect between the PVA layer and the intermediate core layer. Whether the layers will separate after long-term use; c. The PVA layer will shrink and crack in the dry state, affecting the use. Summary of the Invention

[0004] The purpose of the present invention is to provide a cleaning cloth that does not become hard when dry and has strong integrity.

[0005] The purpose of the present invention is achieved as follows:

[0006] A cleaning cloth that does not become hard when dry is made by foaming with polyvinyl alcohol as the raw material; the specific production method of the cleaning cloth is as follows:

[0007] Wheat starch and clear water are stirred evenly at a ratio of 1:6 - 10, and heated to about 75°C during the stirring process to form a starch paste slurry; after cooling, it becomes starch paste a;

[0008] Polyvinyl alcohol and clear water are mixed at a ratio of 1:15 - 20, and then heated and dissolved to form solution b; an appropriate amount of formaldehyde solution is added to solution b and stirred evenly to form mixed solution c;

[0009] Starch paste a and mixed solution c are mixed and stirred to form mixed solution d;

[0010] Control the mixed solution d within the temperature range of 30 - 50 °C, add 6 - 8% of industrial hydrochloric acid or dilute sulfuric acid to the mixed solution d, and stir evenly to form solution e;

[0011] Inject solution e into a specified mold container and heat it within the temperature range of 70 - 90 °C, and wait for a certain foaming reaction time to form a cleaning cloth;

[0012] Wash the formed cleaning cloth to remove the residual wheat starch.

[0013] The starch paste a and the mixed solution c are mixed in a ratio of 1:1.

[0014] When the starch paste a and the mixed solution c are mixed, the amount of the starch paste a is greater than that of the mixed solution c.

[0015] During the mixing process of the starch paste a and the mixed solution c, they need to be stirred and mixed in a container above 30 °C until they are completely fused to form the mixed solution d; the formed mixed solution d needs to be quickly added with industrial hydrochloric acid or dilute sulfuric acid and stirred to form solution e.

[0016] In all steps before forming solution e, the temperature of the mixing container shall not exceed 70 °C.

[0017] After laying a mesh cloth in the mold container, then inject solution e. After solution e is evenly distributed on the mesh cloth, heat it for reaction.

[0018] The mesh cloth has elasticity.

[0019] The mesh cloth is an ultra - fine fiber cloth or a gauze.

[0020] After the polyvinyl alcohol undergoes a heating reaction, polyvinyl formaldehyde is formed. The polyvinyl formaldehyde fully covers the mesh cloth and forms an integral whole that is closely connected to the mesh cloth.

[0021] Under the action of the mesh cloth, the surface of the cleaning cloth in the dry state is uneven.

[0022] The prominent and beneficial technical effects of the present invention compared with the prior art are:

[0023] 1. The cleaning cloth made by the unique manufacturing process of the present invention can remain soft in the dry state. The main reason is as follows: Starch paste slurry is formed by high-temperature stirring at 70 °C and then cooled to form starch paste a. The starch paste a formed at high temperature has better viscosity, and the starch paste slurry that is almost cooked has less granularity. It is necessary to cool the starch paste a before mixing it with other raw materials. The high-temperature starch paste a will bring chemical reactions to the stirring and fusion, avoiding the phenomenon of local granularity in the finished product. Only after cooling can the starch paste a be better fused with the mixed solution c formed by polyvinyl alcohol and formaldehyde to form the mixed solution d. Acid is added in a specified temperature environment to form the final solution e, and finally the solution e is subjected to high-temperature evaporation to form the cleaning cloth. Under the scenario of specified ratio and temperature, a towel that is not hard when dry can be processed. By making pores in polyvinyl formal with starch in a specified ratio and dispersing the layout of polyvinyl formal, the pores formed by the almost cooked starch are finer. The finer the pores are, the more fluffy and soft the polyvinyl formal after washing off the wheat starch will be, and it can remain soft in the dry state.

[0024] 2. In order to make the cleaning cloth made remain soft in the dry state, it is necessary to reasonably configure the proportion of the starch paste. Preferably, the amount of starch paste a is greater than or equal to the amount of the mixed solution c. Appropriately increasing the proportion of wheat starch can make the pores of polyvinyl formal more sufficient and finer. Preferably, an elastic mesh cloth can be placed in the cleaning cloth. The elastic mesh cloth can not only adsorb polyvinyl formal, but also make the formed cleaning cloth softer, improving the user experience. Since the mesh cloth is directly added to the mold for one-time molding, the overall integrity is stronger.

[0025] 3. The mesh cloth of the present application is preferably made of elastic ultra-fine fibers, and polyvinyl formal is provided in the pores of the ultra-fine fibers. Capillary action will be formed on the surface of the ultra-fine fibers, which can better adsorb polyvinyl formal; the combination between the ultra-fine fibers and polyvinyl formal is stronger, and polyvinyl formal can be effectively adsorbed on the surface and in the pores of the fiber cloth, making the overall integrity between polyvinyl formal and the fiber cloth stronger.

[0026] 4. Another reason for the cleaning cloth to remain soft in the dry state is that during the mixing process of starch paste a and mixed solution c, they need to be stirred and mixed in a container at 30 - 50 °C until the two are completely fused to form mixed solution d. In this way, the formed mixed solution d is more uniform, especially the internal starch will be more refined. The evenly stirred mixed solution d needs to be quickly added with industrial hydrochloric acid or dilute sulfuric acid and stirred to form solution e. After adding the acid, local reactions will occur. Therefore, a certain amount of acid needs to be quickly added to make the reaction uniform and avoid local over-reaction. Since the temperature is controlled below 70 °C during the acid addition process, the reaction will not be too violent and is more controllable, and the resulting cleaning cloth product will also be better. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the cleaning cloth in the dry state of the present invention;

[0028] Figure 2 is a schematic structural diagram of the partially cut-open state of the cleaning cloth in the dry state of the present invention;

[0029] Figure 3 is a schematic structural diagram of the partially cut-open state of the cleaning cloth in the wet state of the present invention.

[0030] In the figure: 1 - polyvinyl formal; 2 - mesh cloth. DETAILED DESCRIPTION OF THE INVENTION

[0031] The following further describes the present invention with specific examples in conjunction with the accompanying drawings, as shown in Figures 1-3 shown:

[0032] A cleaning cloth that does not become hard when dry. The cleaning cloth is made by foaming polyvinyl alcohol as the raw material. The specific production method of the cleaning cloth is as follows:

[0033] Wheat starch and clear water are stirred evenly at a ratio of 1:6 - 10, and heated to about 75 °C during the stirring process to become starch paste slurry; after cooling, it becomes starch paste a;

[0034] Polyvinyl alcohol and clear water are mixed at a ratio of 1:15 - 20, and then heated and dissolved to form solution b; an appropriate amount of formaldehyde solution is added to solution b and stirred evenly to form mixed solution c. Preferably, the formaldehyde solution and polyvinyl alcohol are mixed in almost the same amount to form polyvinyl formal;

[0035] Starch paste a and mixed solution c are mixed and stirred to form mixed solution d; preferably, the amount of starch paste a is greater than or equal to the amount of mixed solution c, and during the mixing process of starch paste a and mixed solution c, they need to be stirred and mixed in a container above 30 °C until the two are completely fused to form mixed solution d.

[0036] Control the mixed solution d within the temperature range of 30 - 50 °C. Add 6 - 8% of industrial hydrochloric acid or dilute sulfuric acid to the mixed solution d and stir evenly to form solution e. Moreover, the formed mixed solution d needs to be quickly added with industrial hydrochloric acid or dilute sulfuric acid and stirred to form solution e, that is, the process of adding acid should be fast so that the reaction occurs evenly without causing local overreaction.

[0037] Inject solution e into a specified mold container and heat it within the temperature range of 70 - 90 °C, and wait for a certain foaming reaction time to form a cleaning cloth. This reaction time is not less than 5 hours and is controlled within the range of 5 - 10 hours according to the different thicknesses of the cleaning cloth. Finally, wash the formed cleaning cloth to remove the residual wheat starch. The washed cleaning cloth can be kept in a dry state without becoming hard. If the cleaning cloth has a large thickness, a small amount of non-toxic and odorless softening agent can also be added during the stirring and mixing process. Without adding any softening agent, the formed cleaning cloth can also be dried without becoming hard according to the above process. The main reasons for the cleaning cloth being dried without becoming hard are as follows: a. The starch paste a formed at high temperature has better viscosity, with fewer granular sensations of the starch paste slurry that is almost cooked. And appropriately increasing the proportion of wheat starch can make the pores of polyvinyl formal more sufficient and fine. The finer the pore formation, the more fluffy and soft the polyvinyl formal after washing away the wheat starch, and it can remain soft in the dry state. b. The process of adding acid should be fast so that the reaction occurs evenly without causing local overreaction. c. Prepare the mixed solution d within the temperature range of 30 - 50 °C. In all steps before forming solution e, the temperature of the mixing container shall not exceed 70 °C. Therefore, the reaction will not be too intense, is more controllable, and the obtained cleaning cloth product will be better.

[0038] This application can be without a mesh fabric inside, or can be provided with a mesh fabric inside. The specific forming method for specific products is determined by the manufacturer itself. Preferably, after laying an elastic mesh fabric 2 in the mold container, solution e is injected. After the solution e is evenly distributed on the mesh fabric, a heating reaction is carried out. The elastic mesh fabric has at least the following advantages: a. The formed cleaning cloth is structurally strengthened by the mesh fabric, and the integrally formed cleaning cloth has strong integrity and there will be no detachment phenomenon; b. The elastic mesh fabric can make the formed cleaning cloth softer and improve the use experience; c. The mesh fabric is preferably made of elastic ultrafine fibers, and capillary action will be formed on the surface of the ultrafine fibers, which can better adsorb polyvinyl formal; the combination between the ultrafine fibers and polyvinyl formal is stronger, and polyvinyl formal can be effectively adsorbed on the surface and pores of the fiber fabric, making the polyvinyl formal 1 and the fiber fabric form a stronger overall integrity; d. Polyvinyl formal will shrink and deform in the dry state, and the elastic mesh fabric can effectively prevent the excessive deformation of polyvinyl formal. Therefore, under the action of the mesh fabric, the surface of the cleaning cloth in the dry state is uneven, and the uneven surface can increase the surface friction effect and can clean some solid dirt. As Figure 2 and Figure 3 shown, for the cleaning cloth in the dry state and the wet state, after cutting the cleaning cloth, the mesh fabric can be clearly seen; in the dry state, it can also be seen that the mesh fabric 2 makes the local part of the cleaning cloth uneven. The effect brought by the elastic mesh fabric to the cleaning cloth is significant.

[0039] The above embodiments are only the preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A cleaning cloth that is not hard when dry, characterized in that: The cleaning cloth is made of polyvinyl alcohol by foaming; the specific production method of the cleaning cloth is as follows: The wheat starch and clean water are mixed evenly in a ratio of 1:6-10, and heated to about 75°C during the mixing process to form a starch paste slurry; after cooling, it becomes starch paste a; Polyvinyl alcohol and clean water are mixed in a ratio of 1:15-20, and then heated to dissolve, thereby forming solution b; an appropriate amount of formaldehyde solution is added to solution b and stirred evenly, thereby forming a mixed solution c; The starch paste a and the mixed solution c are mixed and stirred to form a mixed solution d; Control the temperature of the mixed solution d within the range of 30-50 degrees Celsius, add 6-8% industrial hydrochloric acid or dilute sulfuric acid to the mixed solution d, and stir evenly to obtain solution e; Solution e is injected into a designated mold container and heated to a temperature range of 70-90 degrees Celsius, and a certain foaming reaction time is waited to form a cleaning cloth; The formed cleaning cloth is washed to remove the residual wheat starch.

2. The cleaning cloth that is not hard after drying according to claim 1, characterized in that: The starch paste a and the mixed solution c are mixed in a ratio of 1:

1.

3. The cleaning cloth that dries without becoming hard according to claim 1, characterized in that: When the starch paste a and the mixed solution c are mixed, the amount of the starch paste a is greater than the amount of the mixed solution c.

4. The cleaning cloth that is not hard after drying according to claim 1, 2 or 3, characterized in that: During the mixing process, the starch paste a and the mixed solution c need to be stirred and mixed in a container above 30 degrees Celsius until the two are completely blended to form a mixed solution d; the formed mixed solution d needs to be quickly added with industrial hydrochloric acid or dilute sulfuric acid and stirred to form a solution e.

5. The cleaning cloth that dries without becoming hard according to claim 4, characterized in that: During all steps prior to forming solution e, the temperature of the mixing vessel must not exceed 70 degrees Celsius.

6. The cleaning cloth that is not hard after drying according to claim 1, 2, 3 or 5, characterized in that: After a mesh is laid in the mold container, solution e is injected, and solution e is evenly spread on the mesh before heating and reaction.

7. The cleaning cloth that dries without becoming hard according to claim 6, characterized in that: The mesh cloth has elasticity.

8. The cleaning cloth that dries without becoming hard according to claim 7, characterized in that: The mesh cloth is ultra-fine fiber cloth or gauze.

9. The cleaning cloth that dries without becoming hard according to claim 7 or 8, characterized in that: After the polyvinyl alcohol is heated and reacted, polyvinyl formal is formed, and the polyvinyl formal is fully spread on the mesh and forms a tightly connected whole with the mesh.

10. The cleaning cloth that dries without becoming hard according to claim 9, characterized in that: Under the action of the mesh cloth, the surface of the cleaning cloth in a dry state is uneven.

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