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CN-122011432-A - Hydrogel nested structure, preparation method and application thereof

CN122011432ACN 122011432 ACN122011432 ACN 122011432ACN-122011432-A

Abstract

The invention discloses a hydrogel nested structure, a preparation method and application thereof, wherein the hydrogel nested structure comprises a hollow hydrogel shell and an internal object arranged in the hydrogel shell, the hydrogel shell is formed by polymerizing a reaction aqueous solution consisting of a water-soluble monomer, alkali, a cross-linking agent, an initiator, a reinforcing agent, a humectant, a water-soluble auxiliary agent and a water-soluble pigment in a reaction forming device, and the internal object is completely wrapped by the hydrogel shell after polymerization forming. The invention aims to endow the hydrogel shell with excellent mechanical properties through a special material formula and a special forming process, ensure that the hydrogel shell always keeps high toughness, high strength and no breakage in the whole process of water swelling and transparent transformation, ensure that the hydrogel nested structure can be applied to the field of blind boxes, greatly widen the application field of hydrogel materials and realize larger commercial value.

Inventors

  • WANG MING
  • ZHANG CHENGYU
  • ZHOU QINHUA

Assignees

  • 浙江三赢新材料有限公司

Dates

Publication Date
20260512
Application Date
20260113

Claims (10)

  1. 1. A hydrogel nesting structure is characterized by comprising a hydrogel shell and an embedded object arranged in the hydrogel shell, wherein the hydrogel shell is formed by polymerizing a reaction aqueous solution consisting of a water-soluble monomer, alkali, a cross-linking agent, an initiator, an enhancer, a humectant, a water-soluble auxiliary agent and a water-soluble pigment in a reaction forming device, and the embedded object is completely wrapped by the hydrogel shell after polymerization forming.
  2. 2. The hydrogel nesting structure of claim 1, wherein in the hydrogel nesting structure, a hydrogel shell is a soft and water-containing elastic colloid with certain strength, the initial state is opaque, the hydrogel shell swells into transparent or semitransparent hydrogel after absorbing water, and the water absorption rate of the hydrogel shell is 10-30 times.
  3. 3. The hydrogel nesting structure of claim 1, wherein the aqueous reaction solution comprises, by weight, 15% -35% of a water-soluble monomer, 5% -20% of an alkali, 0.01% -1% of a cross-linking agent, 0.01% -1% of an initiator, 0.1% -5% of an enhancer, 0.1% -25% of a humectant, 0% -5% of a water-soluble auxiliary agent, 0% -0.5% of a water-soluble pigment, and the balance of water, wherein the total weight percentage of the components is 100%.
  4. 4. The hydrogel nesting structure of claim 1, wherein said water-soluble monomer is one or more of acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, hydroxyethyl acrylate, hydroxypropyl acrylate, and said base is one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, and sodium bicarbonate.
  5. 5. The hydrogel nesting structure of claim 1, wherein the cross-linking agent is composed of a compound containing multiple double bond groups and a compound containing multiple epoxy groups, the compound containing multiple double bond groups comprises one or more of polyethylene glycol di (methyl) acrylate, diethylene glycol dimethacrylate, allyl methacrylate, 1-trimethylolpropane triacrylate, triallylamine, N' N-methylenebisacrylamide and tetraallyloxyethane, the compound containing multiple epoxy groups comprises one or more of ethylene glycol diglycidyl ether and polyethylene glycol diglycidyl ether, and the initiator is one or more of azo water-soluble initiator, persulfate-sodium bisulfite system, persulfate-organic amine system or hydrogen peroxide-ascorbic acid system.
  6. 6. The hydrogel nesting structure of claim 1, wherein the reinforcing agent is one or more of polyvinyl alcohol, high molecular weight polyethylene glycol, polyoxyethylene monovinyl ether and nano silicon dioxide, the humectant is one or more of dihydric alcohol, polyhydric alcohol or low molecular weight polyethylene glycol, and the water-soluble auxiliary agent is one or more of bitter essence, an antibacterial agent, a water-soluble surfactant and a thickening agent.
  7. 7. The preparation method of the hydrogel nesting structure according to any one of claims 1 to 6 is characterized by comprising the following steps of S1, uniformly mixing water-soluble monomers, alkali and water according to a proportion, cooling the mixed solution to below 25 ℃, S2, uniformly mixing the mixed solution of the step S1, a cross-linking agent, an enhancer, a humectant, a water-soluble auxiliary agent and a water-soluble pigment according to a proportion to obtain a reaction solution A, S3, respectively preparing a solution B and a solution C by a required initiator, S4, preheating a reaction former to a reaction temperature, discharging an internal object at a locating point in a die cavity, closing the die, S5, mixing A, B, C three reaction solutions in a material storage cavity according to a proportion by a metering system, S6, uniformly mixing the reaction solutions, injecting materials into the die cavity by a material injection port according to a set material injection amount, S7, performing polymerization molding according to a set reaction temperature and a reaction time, S8, cooling, and demolding to obtain the formed nesting structure.
  8. 8. The method for preparing the hydrogel nesting structure according to claim 7, wherein the reaction forming device adopts a multichannel metering feeding mode, different reaction liquids are respectively and accurately metered by metering pumps according to proportion, a mold release agent is sprayed on the surface of a mold cavity of the reaction forming device, the reaction temperature of polymerization forming is 20-50 ℃, and the reaction time is 5-50 minutes.
  9. 9. The method of claim 7, wherein the thermal deformation temperature (HDT) of the portion of the insert in contact with the hydrogel shell is 10 ℃ or higher than the highest temperature of the polymerization reaction of the hydrogel or the post heat treatment temperature.
  10. 10. Use of a hydrogel nest structure according to any one of claims 1 to 6, wherein the hydrogel nest structure is used in the field of blind cases, including but not limited to one or more of a handy, toy, card, stationery, cosmetic.

Description

Hydrogel nested structure, preparation method and application thereof Technical Field The invention relates to the technical field of hydrogels, in particular to a hydrogel nested structure, a preparation method and application thereof. Background The blind box is used as a fashion commodity in the popular market, and the key charm of the blind box is the expected feeling of a doll with an unknown style before opening, the surprise feeling after opening, and the collection and social fun brought by the blind box. The current blind box products are mainly presented in a static plastic doll or model form, and the unpacked interactive form is single. Meanwhile, the toy made of the super absorbent resin (hydrogel) has unique interestingness by the dynamic characteristics of water expansion and morphological change. The core function of the super absorbent resin toys on the market at present is that the super absorbent resin toys swell when meeting water, and visual change is generated. However, the toy is extremely easy to loose, break and even disintegrate due to the rapid decrease of the strength of the resin network after the toy is inflated by soaking water, and the ornamental value and the durability are poor. If the existing hydrogel toy material is directly introduced into the hydrogel nested structure as a hydrogel shell, on one hand, the hydrogel shell after water absorption is extremely easy to crack at the weak part and rapidly expand to cause the shell to crack under the action of stress, and on the other hand, how to integrally mold the hydrogel shell in a built-in object to form a wrapping structure does not suggest in the prior art. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a hydrogel nested structure, a preparation method and application thereof. The hydrogel shell has excellent mechanical properties through a special material formula and a special molding process, and ensures that the hydrogel shell always maintains high toughness, high strength and no breakage in the whole process of water absorption expansion and transparentization transformation. The technical scheme includes that the hydrogel nesting structure comprises a hydrogel shell and an embedded object arranged in the hydrogel shell, wherein the hydrogel shell is formed by polymerizing a reaction aqueous solution consisting of a water-soluble monomer, alkali, a cross-linking agent, an initiator, an enhancer, a humectant, a water-soluble auxiliary agent and a water-soluble pigment in a reaction forming device, and the embedded object is completely wrapped by the hydrogel shell after polymerization forming. Among them, hydrogel nesting structures include, but are not limited to, spheres, cylinders, cubes, cuboids, pyramids, and other irregular shapes. Further, in the hydrogel nesting structure, the hydrogel shell is a soft water-containing elastic colloid with certain strength, the initial state is opaque, the hydrogel swells into transparent or semitransparent hydrogel after absorbing water, and the water absorption multiplying power of the hydrogel shell is 10-30 times. The hydrogel shell is not a completely airtight shell, two symmetrical small holes (holes formed by injection molding holes and positioning points respectively) are formed in the surface of the hydrogel shell, water can enter a gap between the gel layer and the built-in object from the small holes in the water absorption process until internal and external water pressures are balanced, and as the contact area between the outer surface of the gel layer and the water is far larger than the contact area between the inner surface of the gel layer and the water, the outward expansion force is larger than the inward extrusion force, and as the water absorption expansion is carried out, the space between the hydrogel shell and the built-in object can be gradually enlarged, so that the built-in object can not be extruded in the expansion process. Further, the reaction aqueous solution comprises, by weight, 15% -35% of a water-soluble monomer, 5% -20% of alkali, 0.01% -1% of a cross-linking agent, 0.01% -1% of an initiator, 0.1% -5% of a reinforcing agent, 0.1% -25% of a humectant, 0% -5% of a water-soluble auxiliary agent, 0% -0.5% of a water-soluble pigment and the balance of water, wherein the sum of the weight percentages of the components is 100%. Further, the water-soluble monomer is one or more of acrylic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, hydroxyethyl acrylate and hydroxypropyl acrylate, and the alkali is one or more of sodium hydroxide, potassium hydroxide, sodium carbonate and sodium bicarbonate. Further, the cross-linking agent is composed of a compound containing multiple double bond groups and a compound containing multiple epoxy groups, wherein the compound containing multiple double bond groups comprises one or more of polyethylene glycol di (methyl) acrylate, diethylene glycol dimetha