CN-122011491-A - Biodegradable and durable buffered gelatin-glycerol sponge

Abstract

The invention relates to the technical field of packaging material preparation, and discloses a biodegradable and durable buffered gelatin-glycerol sponge and a preparation method thereof. The gelatin is melted in the proportion and then mixed with glycerol and water according to a certain mass ratio to prepare gelatin-glycerol solution, and the gelatin-glycerol solution is foamed, frozen and dried to obtain the gelatin-glycerol sponge. The prepared gelatin-glycerin sponge has repeated buffering durability and fatigue resistance, can be prepared into plasticity of any required shape, has the degradability of rapidly degrading the soil surface and the soil interior, has the advantage of environmental protection on the basis of being capable of replacing traditional white pollutants EPE and EPS, and has wide application prospect in the field of packaging and buffering.

Inventors

• SHEN JING
• SHAO CHANGYAN
• Xiong Reng
• TANG CAIYAN
• LUO MENG
• WANG JUN
• FENG XIYUN
• ZHANG XUFENG

Assignees

• 云南师范大学

Dates

Publication Date

20260512

Application Date

20260210

Claims (10)

1. 1. A method for preparing a biodegradable and durable cushioned gelatin-glycerin sponge, comprising the steps of: Step S1, adding gelatin, glycerol and water in the formula mass ratio into a water bath above the melting point temperature of the gelatin, and stirring uniformly after the gelatin is melted to obtain a gelatin-glycerol solution; and S2, placing the gelatin-glycerol solution in an ice water bath for foaming, transferring the gelatin-glycerol solution into a mold, freezing the gelatin-glycerol solution for 12-36 hours at a temperature of-70 to-30 ℃, and freeze-drying the gelatin-glycerol solution for 36-64 hours to obtain the gelatin-glycerol sponge.
2. 2. The method according to claim 1, wherein in step S2, the foaming is performed by mechanical foaming of a gelatin-glycerol solution.
3. 3. The method for preparing the biodegradable and durable cushioned gelatin-glycerin sponge according to claim 2, wherein the mechanical foaming is carried out by stirring for 5-10 min at 1000-2000 r/min.
4. 4. The method for preparing the biodegradable and durable cushioned gelatin-glycerin sponge according to claim 1, wherein in the step S1, the mass ratio of gelatin, glycerin and water is 5:1:45 to 5:16:45.
5. 5. A gelatin-glycerol sponge prepared by the method for preparing a biodegradable and durable buffered gelatin-glycerol sponge according to any one of claims 1 to 4.
6. 6. A biodegradable and durable buffered gelatin-glycerol sponge is characterized by being prepared from gelatin, glycerol and water according to the mass ratio of 5:1:45-5:16:45.
7. 7. A biodegradable and durable cushioned gelatin-glycerin sponge according to claim 6, wherein the gelatin-glycerin sponge exhibits a monotonically increasing strain-stress curve when subjected to axial compression and does not have an S-shaped inflection point, Wherein the rebound rate of the gelatin-glycerin sponge is not less than 90%; The gelatin-glycerin sponge has a compression set of no more than 2.5% at 30 minutes constant compression, 50% strain.
8. 8. The biodegradable and durable cushioned gelatin-glycerin sponge according to claim 6, wherein the gelatin-glycerin sponge has a water vapor transmission rate of 0.8 x 10 3 g m -2 d -1 at 23 ℃ and a water vapor transmission rate of 3.5 x 10 3 g m -2 d -1 at 38 ℃ at 160% ggs.
9. 9. The biodegradable and durable cushioned gelatin-glycerin sponge of claim 8, wherein the gelatin-glycerin sponge has a maximum load of 5-15N.
10. 10. Use of a biodegradable and durable buffered gelatin-glycerol sponge according to claim 5 or any of claims 6-9 for the preparation of a transportation buffer packaging material.

Description

Biodegradable and durable buffered gelatin-glycerol sponge Technical Field The invention relates to the technical field of packaging material preparation, in particular to a biodegradable and durable buffered gelatin-glycerol sponge. Background The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. The buffer material is indispensable in the fields of logistics transportation, product packaging, precision instrument protection and the like, has the core functions of protecting objects by effectively dissipating kinetic energy at the moment of impact, and has good anti-fatigue characteristics by keeping structural integrity and functionality under multiple impacts. For a long time, the market has been dominated by petroleum-based polymer foams, of which Expandable Polystyrene (EPS) and Expanded Polyethylene (EPE) account for the vast majority of the market share due to their outstanding cushioning properties and low production costs. These materials absorb energy through plastic deformation of their cell structure, which performs well in single impact protection. However, this type of material is an important cause of "white pollution", and development of biodegradable green cushioning materials has become an important research direction in academia and industry in pursuit of green production and low carbon emission. For this reason, research has focused on natural renewable bio-based systems such as starch, cellulose, and the like. There have been a great deal of research efforts to develop various biodegradable cushioning materials, for example, there are studies reporting sisal fiber-starch filled composite materials exhibiting their degradation ability in a specific period, and studies on the synthesis of thick-walled cellulose sponge by a temperature-regulating method, which is also basically degraded after being buried in soil for a certain period of time. A ubiquitous, difficult to reconcile conflict between environmental friendliness and long lasting cushioning properties. If the material is subject to rapid degradation, the molecular chain of the material may be designed to be shorter or have lower crosslinking degree, which further worsens the mechanical property, the buffer material needs to bear the kinetic energy impact of multiple dropping and vibration in logistics transportation, and for the early bio-based material, tiny and irreversible structural damage can be accumulated in each loading-unloading cycle. For example, the partially broken cell walls can no longer effectively carry stresses during subsequent cycles, resulting in a decrease in the compressive stress plateau of subsequent cycles and a decrease in the effective energy absorbing capacity. The excellent material should be capable of basically overlapping stress-strain curves after multiple cycles, while early bio-based materials often show remarkable changes of curve morphology after few cycles, which indicates that the fatigue resistance can not meet the actual application requirements. If attempts are made to increase the strength by enhancing the crosslinking, it is also possible to reduce the degradation rate or to make the degradation conditions severe. Therefore, these materials are often only applicable to short-term, disposable scenes where cushioning properties are not high, and cannot be used as a reliable substitute for traditional foam plastics that need to be durable and used many times for a long period of time, greatly limiting their range of application and market competitiveness. Therefore, developing a biomass packaging material with good biodegradability and good fatigue resistance is a technical problem in the industry. Disclosure of Invention The invention aims to solve the problem that the biodegradability and fatigue resistance of the existing biomass material are difficult to be compatible, and provides the biodegradable and durable-buffering gelatin-glycerol sponge, wherein the prepared gelatin-glycerol sponge can be degraded in soil within 30 days, has good plasticity, keeps stable mechanical protection performance in a complex damp and hot environment, has excellent fatigue resistance, and also has recycling performance. The technical scheme of the invention is as follows: In one aspect, the invention provides a method for preparing a biodegradable and durable buffered gelatin-glycerol sponge, comprising the steps of: Step S1, adding gelatin, glycerol and water in the formula mass ratio into a water bath above the melting point temperature of the gelatin, and stirring uniformly after the gelatin is melted to obtain a gelatin-glycerol solution; and S2, placing the gelatin-glycerol solution in an ice water bath for foaming, transferring the gelatin-glycerol solution into a mold, freezing the gelatin-glycerol solution for 12-36 hours at a temperature of-70 to-30 ℃, and freeze-drying the gelatin-glycerol solution for 36-64 hou