CN113980409A - Water-based boron-free ultra-light clay formula with excellent ductility and preparation method thereof - Google Patents
Water-based boron-free ultra-light clay formula with excellent ductility and preparation method thereof Download PDFInfo
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- CN113980409A CN113980409A CN202111229390.6A CN202111229390A CN113980409A CN 113980409 A CN113980409 A CN 113980409A CN 202111229390 A CN202111229390 A CN 202111229390A CN 113980409 A CN113980409 A CN 113980409A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/32—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof from compositions containing microballoons, e.g. syntactic foams
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/22—Expandable microspheres, e.g. Expancel®
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2401/08—Cellulose derivatives
- C08J2401/26—Cellulose ethers
- C08J2401/28—Alkyl ethers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
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Abstract
The invention provides aqueous boron-free ultra-light clay, which comprises the following components in percentage by mass of 100 percent: 2-8 wt% of sodium polyacrylate, 2-10 wt% of foaming agent, 0.1-0.3 wt% of essence, 0.1-5.0 wt% of pigment, 0.1-0.3 wt% of bittering agent, 2-5 wt% of humectant and 80-95 wt% of water. The water-based boron-free ultra-light clay disclosed by the invention is formed by mainly using sodium acrylate, does not contain boron elements and is high in safety. Meanwhile, when the sodium polyacrylate with high number-average molecular weight is dissolved in water, the molecular chain is increased by the ionic phenomenon of a plurality of anionic groups in the sodium polyacrylate molecule, and finally the hydrogel with high elasticity is formed, so that the ultralight clay has excellent ductility.
Description
Technical Field
The invention relates to the technical field of ultralight clay, in particular to ultralight clay which is boron-free in an aqueous system and excellent in extensibility and a preparation method thereof.
Background
The ultra-light clay has strong plasticity and bright color, and can be kneaded and created freely by a handwork. The clay is a latest manual creation material integrating the advantages of pottery clay, paper clay, sculpture oil sludge, plasticine and the like, can be perfectly combined with materials such as wood, metal sheets, paillettes, glass and the like, does not need to be baked, can be naturally dried in air within 24-48 hours, is elastic and not cracked, and can be permanently stored.
The ultra-light clay product on the domestic market at present mainly comprises polyvinyl alcohol, borax, water, a foaming agent, a coloring agent and a humectant, and the main elastic structure of the ultra-light clay product is gel formed by the reaction of the polyvinyl alcohol and the borax. However, in the Chinese food sanitation law and food additive sanitation management method, the use of borax as a food additive is prohibited in Ming dynasty. It is reported that boron is an essential trace element for human body, but too low and too high content of boron can produce harmful effect. Borax is added into food, which may cause cumulative damage to human body. It is believed by researchers that prolonged excessive intake of boron has toxic effects on the reproductive, developmental and endocrine systems of the human body. Although the migration amount of boron in the ultralight clay made of borax by some factories can meet the current detection standard, with the increasing requirements of consumers and markets on the quality and safety technology of children art supplies, the children art supplies containing boron are gradually abandoned by the consumers and the markets.
Therefore, the development of a boron-free ultra-light clay is urgently needed.
Disclosure of Invention
In order to solve the problems, the invention provides a water-based boron-free ultra-light clay and a preparation method thereof.
The invention provides aqueous boron-free ultra-light clay, which comprises the following components in percentage by mass of 100 percent: 2-8 wt% of sodium polyacrylate, 2-10 wt% of foaming agent, 0.1-0.3 wt% of essence, 0.1-5.0 wt% of pigment, 0.1-0.3 wt% of bittering agent, 2-5 wt% of humectant and 80-95 wt% of water.
According to one embodiment of the present invention, the sodium polyacrylate has a number average molecular weight of 1000 to 5000 ten thousand.
According to another embodiment of the invention, the foaming agent is at least one of a pulp, an expandable microsphere foaming agent; preferably, the particle size of the expandable microsphere foaming agent is between 9 and 38 μm.
According to another embodiment of the invention, the perfume is a day perfume.
According to another embodiment of the present invention, the bitterant is at least one of naringin and denatonium benzoate.
According to another embodiment of the invention, the humectant is one or more of sodium carboxymethylcellulose, hydroxypropyl methylcellulose, glycerin and butylene glycol.
The invention also provides a preparation method of the water-based boron-free ultra-light clay, which comprises the following steps: s1, dissolving the sodium polyacrylate in water to form a uniform and granular substance-free dispersion system; s2, kneading the dispersion system into a semi-finished product, adding the foaming agent, and uniformly stirring; and S3, sequentially adding the essence, the pigment, the bittering agent and the humectant into the mixture formed in the step S2, and uniformly stirring and kneading the mixture.
According to an embodiment of the present invention, the method further comprises: and S4, placing the mixed material formed in the step S3 in a forming device, and packaging to obtain the water-based boron-free ultra-light clay.
The water-based boron-free ultra-light clay disclosed by the invention is formed by mainly using sodium acrylate, does not contain boron elements and is high in safety. Meanwhile, when the sodium polyacrylate with high molecular weight is dissolved in water, the molecular chain is lengthened by the ionic phenomenon of a plurality of anionic groups in the sodium polyacrylate molecule, and finally the hydrogel with high elasticity is formed, so that the ultralight clay has excellent ductility.
Detailed Description
The technical solution of the present invention is further explained below according to specific embodiments. The scope of protection of the invention is not limited to the following examples, which are set forth for illustrative purposes only and are not intended to limit the invention in any way.
Unless otherwise defined, all terms used herein have the meanings that are commonly understood by those skilled in the art.
The water-based boron-free ultra-light clay comprises the following components in percentage by mass of 100 percent: 2-8 wt% of sodium polyacrylate, 2-10 wt% of foaming agent, 0.1-0.3 wt% of essence, 0.1-5.0 wt% of pigment, 0.1-0.3 wt% of bittering agent, 2-5 wt% of humectant and 80-95 wt% of water.
The sodium polyacrylate functions as a main body of the gel, and when the content of the sodium polyacrylate is less than 2 wt%, the gel strength is insufficient and the sodium polyacrylate is easily changed into a high-viscosity liquid; above 8 wt%, the sodium polyacrylate cannot be completely dissolved, and particles may be generated.
In an alternative embodiment, the sodium polyacrylate has a number average molecular weight of 1000 to 5000 ten thousand. When the number average molecular weight of the sodium polyacrylate is less than 1000 ten thousand, the formed gel has strong viscosity, and the prepared ultra-light clay is easy to stick hands; when the viscosity is more than 5000 ten thousand, the gel has strong stretchability and poor internal viscosity, and the prepared ultralight clay is easy to crack after being dried.
In an alternative embodiment, the foaming agent is at least one of a pulp, an expandable microsphere foaming agent. Preferably, the expandable microsphere foaming agent has a particle size of between 9 and 38 μm. The expanded microsphere foaming agent plays a role of skeleton support. When the content of the expanded microsphere foaming agent is less than 2 wt%, the finished product of the ultralight clay has high density and is easy to collapse; if the content is more than 10 wt%, the ultralight clay has strong drying property and is easy to pulverize and fall off. When the particle size of the expanded microsphere foaming agent is less than 9 mu m, the structure of the expanded microsphere foaming agent is unstable; when the particle size is larger than 38 mu m, the finished product of the ultralight clay is not fine enough.
In an alternative embodiment, the fragrance is a day fragrance. The function of the perfume is to generate a pleasant smell, masking the smell of the product matrix. When the content of the essence is less than 0.1 wt%, the odor of the product matrix cannot be covered; if the content is more than 0.3 wt%, the flavor is strong, causing discomfort to human body.
In an alternative embodiment, the bitterant is at least one of naringin, denatonium benzoate. The bittering agent is added to the product to prevent the product from being eaten by mistake. When the content of the bittering agent is less than 0.1 wt%, the bittering agent cannot play a due role; more than 0.3 wt%, may cause the quality of the ultra-light clay to vary.
In an alternative embodiment, the humectant is one or more of sodium carboxymethylcellulose, hydroxypropyl methylcellulose, glycerin and butanediol. The humectant has the functions of ensuring the humidity of the ultralight clay and prolonging the service life of the product. When the content of the humectant is less than 2 wt%, the humectant cannot play a role; if the content is more than 5 wt%, the humidity of the ultralight clay is increased and the clay is easy to stick to hands.
The invention also provides a preparation method of the water-based boron-free ultra-light clay, which comprises the following steps: s1, dissolving sodium polyacrylate in water to form a uniform and granular substance-free dispersion system; s2, kneading the dispersion system into a semi-finished product, adding a foaming agent, and uniformly stirring; and S3, sequentially adding the essence, the pigment, the bitter agent and the humectant into the mixture formed in the step S2, and uniformly stirring and kneading the mixture. The step S1 is to dissolve the sodium polyacrylate powder completely in water to form gel. The step S2 is to mix the foaming agent and gel uniformly by a kneader to reduce the whole density. The function of the step of S3 is to endow the ultra-light clay with the appearance, fragrance, color, bitterness and moisture retention performance.
In an optional embodiment, the method further comprises: and S4, placing the mixed material formed in the step S3 in a forming device, and packaging to obtain the water-based boron-free ultra-light clay.
The present invention is further described below by way of specific examples. However, these examples are only illustrative and do not set any limit to the scope of the present invention.
In the following examples and comparative examples, reagents, materials and instruments used therefor were commercially available unless otherwise specified.
Example 1
An ultralight clay comprises the following components: 3 wt% of food grade sodium polyacrylate with the number average molecular weight of 5000 ten thousand, 5 wt% of Excellence 920DU 80 foaming agent, 0.1 wt% of essence, 2 wt% of pigment, 0.1 wt% of denatonium benzoate, 2 wt% of sodium carboxymethylcellulose, 2 wt% of glycerol and 85.8 wt% of water.
The ultralight clay is prepared by the following steps:
(1) dissolving sodium polyacrylate with the number average molecular weight of 5000 ten thousand in water until the whole is uniform and no granular substance exists;
(2) adding the semi-finished product obtained in the step (1) into a kneader, adding an Excellence 920DU 80 foaming agent, and then starting the kneader to stir for 30 min;
(3) starting the kneader, sequentially adding essence, pigment, denatonium benzoate, sodium carboxymethylcellulose and glycerol into the kneader, and stirring and kneading uniformly;
(4) placing the mixture in a forming device, and packaging to obtain the water-based ultralight clay.
The aqueous boron-free ultra-light clay prepared in example 1 was tested according to the national standard QB/T2960-.
Example 2
An ultralight clay comprises the following components: 4 wt% of sodium polyacrylate with the number average molecular weight of 5000 ten thousand, 6 wt% of Expancel 920DU 120 foaming agent, 0.1 wt% of essence, 2 wt% of pigment, 0.1 wt% of denatonium benzoate, 2 wt% of sodium carboxymethylcellulose, 2 wt% of glycerol and 83.8 wt% of water.
The ultralight clay is prepared by the following steps:
(1) dissolving sodium polyacrylate with the number average molecular weight of 5000 ten thousand in water until the whole is uniform and no granular substance exists;
(2) adding the semi-finished product obtained in the step (1) into a kneader, adding an Expancel 920DU 120 foaming agent, and then starting the kneader to stir for 30 min;
(3) starting the kneader, sequentially adding essence, pigment, denatonium benzoate, sodium carboxymethylcellulose and glycerol into the kneader, and stirring and kneading uniformly;
(4) placing the mixture in a forming device, and packaging to obtain the water-based ultralight clay.
The aqueous boron-free ultra-light clay prepared in example 2 was tested according to the national standard QB/T2960-2008 color clay, and the test results are shown in the following table.
The ductility of the aqueous boron-free ultralight clay prepared in examples 1 and 2 and the commercially available ultralight clay was tested. The test method is as follows: in an environment of 25 ℃, 10g of ultralight clay is rubbed into a small ball, the ball is made into a cylinder, and slowly and outwards extends by using two hands, so that the maximum stretching length can represent the extensibility of the ultralight clay under the condition of ensuring that the clay is not broken. The test results are shown in table 1.
TABLE 1
| Test object | Length of stretching |
| Example 1 | 3m |
| Example 2 | 3m |
| Commercial boron-containing ultra-light clay | 1m |
The commercially available boron-containing ultra-light clay is NT-1 ultra-light clay produced by Jinhuaboke color clay technical research and development Limited. As can be seen from the data shown in table 1, the aqueous boron-free ultra-light clay prepared by the method in the embodiment of the present invention has better ductility than the existing commercially available ultra-light clay.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. An aqueous boron-free ultra-light clay, which is characterized by comprising the following components by taking the total mass of the aqueous boron-free ultra-light clay as 100 percent:
2. the aqueous boron-free ultra-light clay according to claim 1, wherein the sodium polyacrylate has a number average molecular weight of 1000 to 5000 ten thousand.
3. The aqueous boron-free ultra-light clay according to claim 1, wherein the foaming agent is at least one of pulp and expandable microsphere foaming agent; preferably, the particle size of the expandable microsphere foaming agent is between 9 and 38 μm.
4. The aqueous boron-free ultra-light clay according to claim 1, wherein the essence is a daily essence.
5. The aqueous boron-free ultra-light clay according to claim 1, wherein the bittering agent is at least one of naringin and denatonium benzoate.
6. The water-based boron-free ultra-light clay as claimed in claim 1, wherein the humectant is one or more of sodium carboxymethylcellulose, hydroxypropyl methylcellulose, glycerol and butanediol.
7. 1-6, the preparation method of the water-based boron-free ultra-light clay is characterized by comprising the following steps:
s1, dissolving the sodium polyacrylate in water to form a uniform and granular-substance-free dispersion system;
s2, kneading the dispersion system into a semi-finished product, adding the foaming agent, and uniformly stirring; and
s3, sequentially adding the essence, the pigment, the bittering agent and the humectant into the mixture formed in the step S2, and uniformly stirring and kneading the mixture.
8. The method of manufacturing according to claim 7, further comprising:
and S4, placing the mixed material formed in the step S3 in a forming device, and packaging to obtain the water-based boron-free ultra-light clay.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114479200A (en) * | 2022-02-15 | 2022-05-13 | 上海晨光文具股份有限公司 | Food-grade rice color paste and preparation method thereof |
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