Artificial clay formed by crosslinking iridoid and preparation method thereof

Abstract

The invention discloses artificial clay formed by crosslinking iridoid and a preparation method of the artificial clay. The artificial clay is prepared by the following method: step A, preparing an artificial clay precursor; step B, adding an iridoid cross-linking agent into the artificial clay precursor to obtain an artificial clay prepolymer; and step C, fully stirring the artificial clay prepolymer for condensation reaction to obtain the artificial clay. The formula of the artificial clay adopts non-toxic environment-friendly materials, does not contain components harmful to a human body, does not contain boron, has no pungent smell, and is healthy, safe and environment-friendly. The prepared artificial clay is excellent in tensile property, can be randomly toned, and is outstanding in molding ability; the artificial clay can be repeatedly used and naturally air-dried, and the air-dried artificial clay is bright in color, ultralight, crack-free and excellent in elasticity, can be stored for more than 3 years for a long time, and can be added with characters for coloring.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial clay, and in particular relates to artificial clay formed by cross-linking iridoid ether terpenes and a preparation method thereof. Background Art

[0002] Traditional plasticine and bouncing clay are oil-soluble dough, which is not environmentally friendly and has a pungent odor. A large amount of flavors are added during the production process. The color is dark and not correct, and two colors cannot be mixed. The modeling ability is poor, there is no tensile strength, and the parts are not easy to bond. Different parts must be fixed with toothpicks during use, and the kneading process is easy to get dirty due to the greasiness. The dried product will crack, deform, and deteriorate, and the product is heavy in texture and can be easily swallowed by children, causing great harm to health and causing concern among parents.

[0003] Artificial clay material is water-based mud, non-greasy and odorless, colorful, pure color, can be adjusted as watercolor, different colors of mud put together and mixed to become a third color, the works made are more realistic, and the products can be reused, placed in the air to dry naturally, after drying, the works will not deform, deteriorate, crack, fade, performance and stability, and light texture, excellent tensile properties. Artificial clay is of great help to the intellectual development of children, can give full play to children's imagination, creativity, cultivate children's patience and perseverance, and is also suitable for the craft production of families, individuals, pottery bars and various entertainment venues. However, traditional artificial clay uses boric acid or borax as a cross-linking agent, thereby changing the gel properties of the polyvinyl alcohol base, so that its hydroxyl groups are cross-linked into a network structure, so that the tensile properties of the product are enhanced, agglomerated, and the initial viscosity is improved, so as to prepare clay materials with excellent tensile properties and no stickiness. However, boric acid or borax is highly toxic, and will be deposited in the body and difficult to be discharged, which is easy to cause harm to children's health.

[0004] Patent CN108102266A "A super light clay and its preparation method" uses glutaraldehyde to replace the traditional borax and boric acid cross-linking agents to prepare a boron-free super light clay. However, glutaraldehyde itself has moderate toxicity and a pungent odor, which has a strong irritating effect on the eyes, skin and mucous membranes. Patent CN 109265887A "A super light clay and its preparation method" uses nano calcium carbonate and CMC to replace traditional borax or boric acid to prepare a boron-free super light clay; but nano calcium carbonate and carboxymethyl cellulose can only improve the consistency and smoothness of the super light clay, and cannot form cross-links with polyvinyl alcohol glue with tensile properties, so it cannot well improve the initial adhesion characteristics of the super light clay, thereby preparing a clay material with excellent tensile properties and no stickiness. Patent CN112159574A "Titanate chelate, environmentally friendly boron-free polymer polyvinyl alcohol-based ultra-light clay and its preparation method" uses DuPont's Tyzor series as a crosslinker. The crosslinker uses organic titanium zirconium as the main active element, and isopropyl alcohol as a solvent to participate in the reaction. It has certain environmental protection and reactivity, but it is not absolutely safe. Patent CN112679894A "A boron-free and non-toxic toy ultra-light clay and its preparation method" uses citral as a crosslinker. Citral has certain toxicity and has a strong odor. Patent CN111961301A "A safe and environmentally friendly boron-free ultra-light clay and its preparation method" uses polyvinyl alcohol and silane coupling agent as the subject of preparation, and the stretchability cannot be guaranteed and has a strong odor. Patent CN115558228A "A boron-free ultra-light clay and its preparation method" uses a crosslinker containing aluminum ions to prepare ultra-light clay. Aluminum ions themselves are mobile elements, and EN71-3 requires a limited amount of them. The above-mentioned patents and the disclosed patents not described in this article basically use non-stretchable gel as the main body to prepare ultra-light clay, and use environmentally unfriendly or odorous aldehydes and acids, heavy metals such as titanium zirconium and aluminum, and silicon with poor tensile properties as cross-linking agents to prepare ultra-light clay, which more or less have many problems such as odor, environmental protection, tension, stability, etc.

[0005] Iridoids are a class of active substances widely found in the plant kingdom. They belong to single-dose terpenes and mainly include genipin. The structural formula of genipin is: Genipin derivatives, including gardenamide A, have the structural formula: Loganin, gardenoside and harpagoside are excellent natural biomass crosslinkers, and their toxicity is much lower than glutaraldehyde and other commonly used chemical crosslinkers. Genipin is the product of gardenoside hydrolysis by β-glucosidase. It is an excellent natural biomass crosslinker that can be crosslinked with proteins, collagen, gelatin and chitosan to make biomaterials such as artificial bones and wound dressing materials. The reaction mechanism of genipin and polyvinyl alcohol: Genipin is acted on by hydroxyl groups under alkaline conditions to form an aldehyde intermediate. The hydroxyl groups in polyvinyl alcohol further combine with aldehyde groups to form a crosslinked structure. This reaction leads to the formation of chemical bonds between polyvinyl alcohol molecular chains, thereby enhancing the stability and mechanical properties of the material. The use of biomass crosslinkers has greatly improved the quality and service life of the products, and also has a positive impact on environmental protection. Due to its high crosslinking efficiency, the amount used is relatively small, which reduces the negative impact on the environment. In addition, it has high chemical stability, will not decompose easily, and will not produce harmful substances, which is more in line with the concept of environmental protection. However, the preparation of artificial clay by natural biomass crosslinking agent cyclopentadienyl crosslinking agent has not been reported in scientific literature. Therefore, it is an urgent problem to be solved in the art to develop a boron-free, safe and environmentally friendly, non-irritating odor, excellent tensile performance, non-sticky, pure color, arbitrary color adjustment, outstanding modeling ability, reusable before drying, naturally air-dried, bright color, ultra-light, crack-free, excellent elasticity, long-term preservation, and colorable ultra-light clay through the formation of a network crosslinking structure between the aldehyde group formed by the cyclopentadienyl crosslinking agent under alkaline conditions and the hydroxyl group in the molecular structure of polyvinyl alcohol. Summary of the invention

[0006] In view of the shortcomings and defects of the prior art, the purpose of the present invention is to develop a kind of ultra-light clay which is boron-free, safe and environmentally friendly, has no irritating odor, has good tensile properties and good stability, in order to solve the technical problem:

[0007] The first aspect of the present invention provides an artificial clay cross-linked by cyclopentadienyl ether terpenes, wherein the artificial clay is prepared by the following method: step A: preparing an artificial clay precursor; step B: adding an cyclopentadienyl ether terpenoid cross-linking agent to the artificial clay precursor to obtain an artificial clay prepolymer; step C: fully stirring the artificial clay prepolymer to cause a condensation reaction to obtain the artificial clay.

[0008] Further, the total weight of the iridoid crosslinker and the artificial clay precursor is 100 parts, wherein the weight of the iridoid crosslinker is 0.40-0.48 parts, 0.48-0.56 parts, 0.56-0.74 parts, 0.74-0.82 parts, 0.82-0.90 parts or 0.90-1.00 parts.

[0009] Furthermore, the iridoid cross-linking agent is a biomass iridoid cross-linking agent, and the biomass iridoid cross-linking agent includes genipin and / or genipin derivatives.

[0010] Furthermore, the artificial clay precursor includes skeleton particles, a hydroxyl-containing polyethylene compound solution, a pigment and an additive; the hydroxyl-containing polyethylene compound includes polyvinyl alcohol; the weight of polyvinyl alcohol is 5 parts, 5-7 parts, 7-9 parts, 9-13 parts, 13-15 parts or 15 parts; the molecular weight of polyvinyl alcohol is between 100000-120000, 120000-130000, 130000-140000 or 130000-150000; the degree of polymerization is 2700-2750, 2750-2800, 2800-2850 or 2850-2900; and the degree of alcoholysis is 80-82, 82-84, 84-86 or 86-88.

[0011] Furthermore, the skeleton particles are expandable microspheres, and the weight of the expandable microspheres is 5.0-6.5, 6.5-7.5, 7.5-8.5, 8.5-10.0 or 10.0-12.0 parts; the average particle size of the expandable microspheres is 10-25 μm; the average particle size of the expandable microspheres after expansion is ≥35 μm; the density of the expandable microspheres is ≤20 kg / m3; the weight of the hydroxyl polyethylene compound solution including deionized water as a solvent is 74.0-75.5 parts, 75.5-76.5 parts, 76.5-81.0 parts, 81.0-85.0 parts or 85.0-90.0 parts; the pigment is a water-soluble food-grade pigment, and the weight of the water-soluble food-grade pigment is 1.3-1.6 parts, 1.6-2.1 parts, 2.1-2.6 parts, 2.6-3.0 parts or 3.0-3.5 parts.

[0012] Furthermore, the auxiliary agents include: surfactants, aqueous dispersants, lubricants, humectants, water retaining agents and additives.

[0013] Furthermore, the surfactant is OP-10 emulsifier, and the weight of the surfactant is 0.08-0.15 parts, 0.15-0.25 parts or 0.25-0.33 parts; the aqueous dispersant is Deqian W-18 aqueous dispersant, and the weight of the aqueous dispersant is 0.08-0.15 parts, 0.15-0.25 parts or 0.25-0.33 parts; the lubricant is medical vaseline or lanolin, and the weight of the lubricant is 0.5-0.8 parts, 0.8-1.3 parts or 1.3-2.5 parts; the humectant is propylene glycol, and the weight of the humectant is 2.5-3.5 parts, 3.5-5.5 parts or 5.5-8.0 parts; the water-retaining agent is one or a mixture of guar gum, gelatin and / or sodium alginate, and the weight of the water-retaining agent is 0.8-1.6 parts, 1.6-2.4 parts or 2.4-5.0 parts; the additive includes a preservative, and the preservative is phenoxyethanol or paraben, and the weight of the additive is 0.20-0.35 parts, 0.35-0.45 parts or 0.45-0.50 parts.

[0014] The second aspect of the present invention provides a method for preparing artificial clay, comprising the following steps: step A: preparing an artificial clay precursor; step B: adding an cyclopentane crosslinking agent to the artificial clay precursor to obtain an artificial clay prepolymer; step C: fully stirring the artificial clay prepolymer to cause a condensation reaction to obtain artificial clay.

[0015] Furthermore, the condensation reaction needs to be carried out under alkaline conditions, and the pH value of the alkaline conditions is 9.5-10.5.

[0016] Beneficial effects:

[0017] 1. The patented artificial clay formula uses non-toxic materials, does not contain harmful ingredients to the human body, does not contain boron, has no irritating odor, is healthy, safe and environmentally friendly. It has excellent tensile properties, can be arbitrarily colored, and has outstanding modeling capabilities.

[0018] 2. The patent discloses a method for preparing artificial clay. The prepared artificial clay has excellent tensile properties, can be arbitrarily colored, and has outstanding modeling ability.

[0019] 3. The patented artificial clay has bright color after air drying, is ultra-light, has no cracks, has excellent elasticity, can be stored for more than 3 years, and can be added with words and colors. DETAILED DESCRIPTION

[0020] The detailed features and advantages of this patent are described in detail in the specific implementation method below, and the content is sufficient to enable any technical personnel in this field to understand the technical content of this patent and implement it accordingly. According to the description and claims disclosed in this specification, the technical personnel in this field can easily understand the relevant purposes and advantages of this patent.

[0021] In order to make the purpose, technical scheme and advantages of this patent clearer, the implementation methods of this patent are further described in detail below. The experimental methods described in each embodiment of this patent are conventional methods unless otherwise specified, and the materials, reagents, etc. used in the following embodiments can be obtained from commercial channels unless otherwise specified.

[0022] In this patent, the artificial clay is made of genipin (purchased from Nanjing Chunqiu Bioengineering Co., Ltd., with a content of 98%); surfactant OP-10 emulsifier (from Hai'an Chemical); polyvinyl alcohol (from Sichuan Chuanwei Group, model: 2888) is the colloidal component of the artificial clay, with a degree of polymerization of 2800 and a degree of alcoholysis of 88. Polyvinyl alcohol itself is an environmentally friendly material with good hydrophilicity, stretchability and viscosity. After being dissolved in water, the surfactant OP-10 emulsifier is added to the polyvinyl alcohol to enhance the smoothness and surface activity of the polyvinyl alcohol; expandable microspheres (provided by Akzo, Sweden, model: 461WU40), which are the skeletons for making artificial clay; water-soluble food-grade pigments (provided by Clariant, names: 191 pigment yellow, pigment scarlet, pigment black, etc., model: HGR series) are food-grade raw materials. The purpose of adding water-soluble food-grade pigments is to use The invention discloses a food pigment for increasing the color of artificial clay, making the color of artificial clay bright and colorful, and the food pigment is safe and environmentally friendly; the lubricant is cosmetic grade vaseline (from Shandong Xinbaiwei Chemical Co., Ltd., model: superior pure GR) or lanolin (from Jiangyin Hongshang Biotechnology Co., Ltd.), and the lubricant can make the artificial clay have excellent lubricity and delicate touch; the moisturizing agent is 1,3-propylene glycol (from Guangzhou Qixu Chemical Co., Ltd.), which can maintain the wettability of artificial clay and make the artificial clay have antifreeze performance; the water retaining agent is guar gum (from Jinan Daorong Chemical Co., Ltd., model: GUARAN-6), which can increase the viscosity and thickness of artificial clay and maintain the property that the moisture of the artificial clay product itself does not lose; the water-based dispersant is Deqian W-18 water-based dispersant, and the functional pigment dispersing aid; the main component of the additive is a preservative, and the preservative is phenoxyethanol (commercially available conventional raw material), etc.

[0023] Specifically, this patent provides a method for preparing artificial clay formed by cross-linking cyclic ether terpene, comprising the following steps:

[0024] S1. Prepare an artificial clay precursor: add polyvinyl alcohol to deionized water, heat and stir until the polyvinyl alcohol is completely dissolved, then add a surfactant OP-10 emulsifier, mix well, and obtain polyvinyl alcohol glue; add the obtained polyvinyl alcohol glue to a stirring disperser, start stirring, and after sufficient stirring, add expandable microspheres, water-soluble food-grade pigments, lubricants, water-retaining agents, water-based dispersants and additives and mix well to obtain an artificial clay precursor.

[0025] S2, adding a natural biomass crosslinking agent, an cyclopentane crosslinking agent, to the artificial clay precursor obtained in the above step S1 to obtain an artificial clay prepolymer.

[0026] S3. The artificial clay prepolymer is fully stirred by a stirring disperser, so that the cyclic ether terpene and the polyvinyl alcohol undergo an aldol condensation reaction to cross-link and prepare artificial clay.

[0027] Specifically, the iridoid cross-linking agents include genipin, genipin derivatives, strychnoside, gardenia glycoside and scrophularia glycoside, etc. This patent uses genipin as a biomass cross-linking agent for cross-linking to prepare artificial clay.

[0028] Specifically, based on the total mass of raw materials for preparing the iridoid cross-linked artificial clay (polyvinyl alcohol, iridoid cross-linking agent, deionized water, surfactant, expandable microspheres, water-soluble food-grade pigment, lubricant, humectant, water-retaining agent, aqueous dispersant and additives) as 100 parts, the specific formula includes: deionized water, 74.0-75.5 parts, 75.5-76.5 parts, 76.5-81.0 parts, 81.0 -85.0 parts or 85.0-90.0 parts; polyvinyl alcohol, 5 parts, 5-7 parts, 7-9 parts, 9-13 parts, 13-15 parts or 15 parts; cyclopentane crosslinking agent, 0.40-0.48 parts, 0.48-0.56 parts, 0.56-0.74 parts, 0.74-0.82 parts, 0.82-0.90 parts or 0.90-1.00 parts; water-soluble food grade pigment, 1.3-1.6 parts , 1.6-2.1 parts, 2.1-2.6 parts, 2.6-3.0 parts or 3.0-3.5 parts; expandable microspheres, 5.0-6.5, 6.5-7.5, 7.5-8.5, 8.5-10 or 10-12 parts; lubricant, 0.5-0.8 parts, 0.8-1.3 parts or 1.3-2.5 parts; humectant, 2.5-3.5 parts, 3.5-5.5 parts or 5.5-8.0 parts; Aqueous agent, 0.8-1.6 parts, 1.6-2.4 parts or 2.4-5.0 parts; surfactant, 0.08-0.15 parts, 0.15-0.25 parts or 0.25-0.33 parts; aqueous dispersant, 0.08-0.15 parts, 0.15-0.25 parts or 0.25-0.33 parts; additives, 0.20-0.35 parts, 0.35-0.45 parts or 0.45-0.50 parts.

[0029] Example 1

[0030] This patent provides an artificial clay formed by cross-linking cyclopentadiene ether terpenes and a preparation method thereof.

[0031] Specifically, the raw materials are prepared based on the total mass of 100 parts of the raw materials of the cross-linked artificial clay of genipin, which are composed of the following weight ratios: 80 parts of water, 5 parts of polyvinyl alcohol, 0.5 parts of genipin, 2.5 parts of water-soluble food-grade pigments, 7 parts of expandable microspheres, 0.5 parts of vaseline, 3 parts of propylene glycol, 1 part of guar gum, 0.1 parts of OP-10 emulsifier, 0.1 parts of aqueous dispersant and 0.3 parts of additives.

[0032] Specifically, a method for preparing artificial clay comprises the following steps:

[0033] S1. Prepare an artificial clay precursor: add polyvinyl alcohol to deionized water, heat and stir until the polyvinyl alcohol is completely dissolved, then add a surfactant OP-10 emulsifier, mix well, and obtain polyvinyl alcohol glue; add the obtained polyvinyl alcohol glue to a stirring disperser (source, model, if any), start stirring, and after sufficient stirring, add expandable microspheres, water-soluble food-grade pigments, lubricants, water-retaining agents, water-based dispersants and additives and mix well to obtain an artificial clay precursor.

[0034] S2. Add genipin to the artificial clay precursor obtained in the above step S1 to obtain an artificial clay prepolymer.

[0035] S3. The artificial clay prepolymer is fully stirred by a stirring disperser, so that the cyclic ether terpene and the polyvinyl alcohol undergo an aldol condensation reaction to cross-link and prepare artificial clay.

[0036] Example 2

[0037] Specifically, clay was manufactured according to the method for preparing artificial clay in Example 1, except that the weight ratio of the raw materials of the artificial clay cross-linked with genipin was different.

[0038] Specifically, according to the total mass of the raw materials of the artificial clay cross-linked with genipin in this embodiment as 100 parts, it is composed of the following weight ratios: 75 parts of water, 8 parts of polyvinyl alcohol, 0.6 parts of genipin, 2 parts of water-soluble food-grade pigments, 6.7 parts of expandable microspheres, 1 part of lanolin, 4 parts of propylene glycol, 2 parts of guar gum, 0.2 parts of OP-10 emulsifier, 0.2 parts of aqueous dispersant and 0.3 parts of additives. Artificial clay is prepared.

[0039] Example 3

[0040] Specifically, clay was manufactured according to the method for preparing artificial clay in Example 1, except that the weight ratio of the raw materials of the artificial clay cross-linked with genipin was different.

[0041] Specifically, according to the total mass of the raw materials of the artificial clay cross-linked with genipin in this embodiment as 100 parts, it is composed of the following weight ratios: 76 parts of water, 6 parts of polyvinyl alcohol, 0.8 parts of genipin, 1.5 parts of water-soluble food-grade pigments, 8.8 parts of expandable microspheres, 0.6 parts of vaseline, 4 parts of propylene glycol, 1.5 parts of guar gum, 0.3 parts of OP-10 emulsifier, 0.1 parts of aqueous dispersant and 0.4 parts of additives. Artificial clay is prepared.

[0042] Test Case

[0043] In order to further illustrate the advantages of this patent, the performance of the artificial clay prepared in Examples 1, 2 and 3 was tested.

[0044] Specifically, plasticity: put the artificial clay into a fixed mold and test its plasticity with a plasticity meter. It is qualified if it is in the range of 0.4-1; bouncing power: weigh 15g of ultra-light clay, knead it into a ball, air-dry it naturally for 5 hours, and let it fall freely from a height of 2m. If the rebound height is >30cm, it is qualified; residual characteristics: weigh 10g of ultra-light clay, wipe it on A4 paper according to the kneading strength, and no color residue is qualified; density test: test the density of the finished artificial clay with a density meter; recycling characteristics: after air-drying the ultra-light clay for 48 hours, seal it at a ratio of 1:0.8 of artificial clay: water for 48 hours. After kneading, it can be reused to be qualified; high and low temperature performance: put about 12g of ultra-light clay into a sealed box, place it in a high temperature of 65℃ for 12 hours, and in a low temperature of -25℃ for 10 days. After returning to normal temperature, there is no impact on the quality of the product to be qualified.

[0045] Specifically, the performance test results are shown in Table 1:

[0046] Table 1 Test results of artificial clay properties

[0047]

[0048]

[0049] As shown in Table 1, the performance test results of the artificial clay prepared in Examples 1, 2 and 3 show that the artificial clay prepared by cross-linking and condensing the preferred natural biological cross-linking agent genipin with polyvinyl alcohol and other materials in this patent has excellent performance and a density of only 0.258 g / cm 3 , lower than similar products by 0.35g / cm 3The artificial clay is safe, environmentally friendly, and has no irritating odor; it has excellent tensile properties. The tensile length of the artificial clay prepared by the preparation method of this patent is greater than 1.5 meters, which is better than the standard of similar products greater than 1 meter; it can be arbitrarily colored, while similar products may fade or fall off; it has outstanding modeling ability; it can be reused before drying and air-dried naturally; the air-dried product is bright in color, ultra-light, crack-free, and has excellent elasticity. It can be stored for more than 3 years and can be colored with words.

[0050] In addition, artificial clay produced by cross-linking condensation reaction using a combination of other genipin derivatives and / or polyvinyl alcohol derivatives can also achieve technical effects close to those of the present invention through the above-mentioned test method.

[0051] It can be concluded that the artificial clay cross-linked by iridoid ether terpenes and the preparation method thereof provided by the present invention have the following beneficial effects compared with the prior art:

[0052] 1. The patented artificial clay formula uses non-toxic materials, does not contain harmful ingredients to the human body, does not contain boron, has no irritating odor, is healthy, safe and environmentally friendly. It has excellent tensile properties, can be arbitrarily colored, and has outstanding modeling capabilities.

[0053] 2. This patent discloses a method for preparing artificial clay cross-linked by cyclopentadiene ether terpenes. The prepared artificial clay has excellent tensile properties, can be arbitrarily colored, and has outstanding modeling ability.

[0054] 3. The patented artificial clay has bright color after air drying, is ultra-light, has no cracks, has excellent elasticity, can be stored for more than 3 years, and can be added with words and colors.

[0055] The terms and expressions used herein are for descriptive purposes only, and the present invention should not be limited to these terms and expressions. The use of these terms and expressions does not mean to exclude any equivalent features of the illustrations and descriptions (or parts thereof), and it should be recognized that various modifications that may exist should also be included in the scope of the claims. Other modifications, variations and substitutions may also exist. Accordingly, the claims should be deemed to cover all such equivalents.

[0056] Similarly, it should be pointed out that although the present invention has been described with reference to the current specific embodiments, ordinary technicians in this technical field should realize that the above embodiments are only used to illustrate the present invention, and various equivalent changes or substitutions may be made without departing from the spirit of the present invention. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the essential spirit of the present invention, they will fall within the scope of the claims of the present invention.

Claims

1. An artificial clay cross-linked by cyclopentadiene ether terpenes, characterized in that: The artificial clay is prepared by the following method: Step A: preparing artificial clay precursor; Step B: adding an icroterpene crosslinking agent to the artificial clay precursor to obtain an artificial clay prepolymer; Step C: Fully stirring the artificial clay prepolymer to cause a condensation reaction to obtain the artificial clay.

2. The artificial clay according to claim 1, characterized in that: The total weight of the iridoid crosslinking agent and the artificial clay precursor is 100 parts, wherein the weight of the iridoid crosslinking agent is 0.40-0.48 parts, 0.48-0.56 parts, 0.56-0.74 parts, 0.74-0.82 parts, 0.82-0.90 parts or 0.90-1.00 parts.

3. The artificial clay according to claim 2, characterized in that: The iridoid cross-linking agent is a biomass iridoid cross-linking agent, and the biomass iridoid cross-linking agent includes genipin and / or a genipin derivative.

4. The artificial clay according to claim 1, characterized in that: The artificial clay precursor comprises skeleton particles, a hydroxyl-containing polyethylene compound solution, a pigment and an additive; the hydroxyl-containing polyethylene compound comprises polyvinyl alcohol; the weight of the polyvinyl alcohol is 5 parts, 5-7 parts, 7-9 parts, 9-13 parts, 13-15 parts or 15 parts; the molecular weight of the polyvinyl alcohol is between 100000-120000, 120000-130000, 130000-140000 or 130000-150000; the degree of polymerization of the polyvinyl alcohol is 2700-2750, 2750-2800, 2800-2850 or 2850-2900; the alcoholysis degree of the polyvinyl alcohol is 80-82, 82-84, 84-86 or 86-88.

5. The artificial clay according to claim 4, characterized in that: The skeleton particles are expandable microspheres, the weight of the expandable microspheres is 5.0-6.5, 6.5-7.5, 7.5-8.5, 8.5-10.0 or 10.0-12.0 parts; the average particle size of the expandable microspheres is 10-25 μm; the average particle size of the expandable microspheres after expansion is ≥35 μm; the density of the expandable microspheres is ≤20 kg / m3; The hydroxyl polyethylene compound solution includes 74.0-75.5 parts, 75.5-76.5 parts, 76.5-81.0 parts, 81.0-85.0 parts or 85.0-90.0 parts by weight of deionized water as a solvent; The pigment is a water-soluble food-grade pigment, and the weight of the water-soluble food-grade pigment is 1.3-1.6 parts, 1.6-2.1 parts, 2.1-2.6 parts, 2.6-3.0 parts or 3.0-3.5 parts.

6. The artificial clay according to claim 4, characterized in that: The auxiliary agents include: surfactants, aqueous dispersants, lubricants, humectants, water retaining agents and additives.

7. The artificial clay according to claim 6, characterized in that: The surfactant is OP-10 emulsifier, and the weight of the surfactant is 0.08-0.15 parts, 0.15-0.25 parts or 0.25-0.33 parts; The aqueous dispersant is Deqian W-18 aqueous dispersant, and the weight of the aqueous dispersant is 0.08-0.15 parts, 0.15-0.25 parts or 0.25-0.33 parts; The lubricant is medical vaseline or lanolin, and the weight of the lubricant is 0.5-0.8 parts, 0.8-1.3 parts or 1.3-2.5 parts; The moisturizing agent is propylene glycol, and the weight of the moisturizing agent is 2.5-3.5 parts, 3.5-5.5 parts, and 5.5-8.0 parts; The water retaining agent is one or more of guar gum, gelatin or sodium alginate, and the weight of the water retaining agent is 0.8-1.6 parts, 1.6-2.4 parts or 2.4-5.0 parts; The additives include a preservative, the preservative is phenoxyethanol, and the weight of the phenoxyethanol is 0.20-0.35 parts, 0.35-0.45 parts, or 0.45-0.50 parts.

8. A method for preparing artificial clay, characterized in that: The following steps are involved: Step A: preparing artificial clay precursor; Step B: adding an icridone cross-linking agent to the artificial clay precursor to obtain an artificial clay prepolymer; Step C: Fully stirring the artificial clay prepolymer to cause a condensation reaction to obtain the artificial clay.

9. The preparation method according to claim 8, characterized in that: The condensation reaction needs to be carried out under alkaline conditions, and the pH value of the alkaline conditions is 9.5-10.5.

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