Biomass foaming product and preparation method thereof

Abstract

The invention discloses a biomass foaming product and a preparation method thereof, and belongs to the technical field of biomass foaming materials.The preparation method comprises the following steps that 1, raw materials are prepared, specifically, starch, lignin fibers and additives are prepared by mass; 2) blending and stirring: preliminarily mixing starch and lignin fibers in the raw materials, heating and stirring to obtain a pre-mixture, adding an additive into the pre-mixture, and heating and stirring to obtain sub-balls; 3) screw extrusion, dough dividing and pre-foaming: extruding the dough by using a screw extruder to obtain pre-foamed dough; the preparation method comprises the following steps: by taking starch and lignin fibers as main raw materials, blending and stirring the raw materials under a heating condition, then extruding and grouping by using a screw rod to realize pre-foaming, and performing high-temperature die cavity die-casting molding on the pre-foamed dough to obtain a foamed product. Due to the pre-foaming process design, the duration of single-mold forming is shortened, and the preparation efficiency of foamed products is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of biomass foaming materials, and in particular relates to a biomass foaming product and a preparation method thereof. Background Art

[0002] The research and development of biomass foaming materials aims to find a new green packaging material to avoid the pollution caused by plastic packaging products and get rid of excessive dependence on petroleum-based raw materials. This type of material usually uses biomass-based fiber resources as the main raw material, and a lightweight foaming material is prepared through a specific preparation method, such as mechanical stirring one-step molding. These materials not only meet the urgent need for green packaging materials in the production and circulation field, but also make rational use of abundant biomass resources, which has positive significance for environmental protection.

[0003] At present, the foaming molding time of existing biomass foam products is long, resulting in low preparation efficiency of the foam products. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problems and to propose a biomass foam product and a preparation method thereof.

[0005] On the one hand, in order to achieve the above-mentioned purpose, the present invention adopts the following method: a method for preparing a biomass foamed product, which comprises the following steps:

[0006] 1) Raw material preparation: prepare starch, lignin fiber and additives according to mass proportion;

[0007] 2) Blending and stirring: preliminarily mixing starch and lignin fiber in the raw materials, heating and stirring to obtain a premix, adding additives to the premix, heating and stirring to obtain agglomerates;

[0008] 3) Pre-foaming of the sub-groups by screw extrusion: The sub-groups are extruded by a screw extruder to obtain pre-foamed dough;

[0009] 4) High-temperature die-casting: The pre-foamed dough is die-casted in a high-temperature die to obtain a foamed product.

[0010] As a further description of the above technical solution:

[0011] In the step 1), the lignin fibers account for at least 50% of the total mass.

[0012] As a further description of the above technical solution:

[0013] The lignocellulose consists of wood pulp, bamboo powder, bagasse and straw.

[0014] As a further description of the above technical solution:

[0015] In the step 2), an internal mixer is used for mixing and stirring.

[0016] As a further description of the above technical solution:

[0017] In the step 4), the surface of the mold structure is a jellyfish triangle structure, which is relatively hydrophobic.

[0018] On the other hand, in order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a biomass foam product is prepared by the above-mentioned method for preparing a biomass foam product.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] In the present invention, starch and lignin fiber are used as main raw materials, the raw materials are blended and stirred under heating conditions, and then pre-foaming is achieved by screw extrusion and de-agglomeration. The pre-foamed dough is subjected to high-temperature cavity die-casting to obtain a foamed product. The main principle is that starch gelatinizes and expands under heating conditions, and water is converted into water vapor to complete foaming. The pre-foaming process design shortens the single-mode molding time and improves the preparation efficiency of the foamed products. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a flow chart of a method for preparing a biomass foam product. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1:

[0024] S01: Raw material preparation: starch, lignin fiber and additives are prepared by weight, lignin fiber accounts for 50% of the total weight, and lignocellulose is composed of wood pulp, bamboo powder, bagasse and straw;

[0025] S02: Blending and stirring: preliminarily mix the starch and lignin fiber in the raw materials, heat and stir to obtain a premix, the stirring temperature is 19° C., the stirring time is 11 min, add additives to the premix, heat and stir to obtain agglomerates, the stirring temperature is 39° C., the stirring time is 21 min, and use an internal mixer to mix and stir;

[0026] S03: Pre-foaming of the sub-groups by screw extrusion: The sub-groups are extruded by a screw extruder to obtain pre-foamed dough;

[0027] S04: High-temperature cavity die-casting: The pre-foamed dough is die-casted in a high-temperature cavity to obtain a foamed product. In the mold structure, the surface is a jellyfish triangle structure, which is relatively hydrophobic. The single-mold molding time is 40 seconds.

[0028] Embodiment 2:

[0029] S01: Raw material preparation: starch, lignin fiber and additives are prepared by weight, lignin fiber accounts for 55% of the total weight, lignocellulose is composed of wood pulp, bamboo powder, bagasse and straw, and additives can be aerogel powder, foaming agent, nucleating agent and adhesive;

[0030] S02: Blending and stirring: preliminarily mix the starch and lignin fiber in the raw materials, heat and stir to obtain a premix, the stirring temperature is 19° C., the stirring time is 11 min, and additives are added to the premix, heated and stirred to obtain agglomerates, the stirring temperature is 51° C., the stirring time is 9 min, and mixing and stirring are performed using an internal mixer;

[0031] S03: Pre-foaming of the sub-groups by screw extrusion: The sub-groups are extruded by a screw extruder to obtain pre-foamed dough;

[0032] S04: High-temperature cavity die-casting: The pre-foamed dough is die-casted in a high-temperature cavity to obtain a foamed product. In the mold structure, the surface is a jellyfish triangle structure, which is relatively hydrophobic. The single-mold molding time is 45 seconds.

[0033] Embodiment 3:

[0034] S01: Raw material preparation: starch, lignin fiber and additives are prepared by weight, lignin fiber accounts for 60% of the total weight, lignocellulose is composed of wood pulp, bamboo powder, bagasse and straw, and additives can be aerogel powder, foaming agent, nucleating agent and adhesive;

[0035] S02: Blending and stirring: preliminarily mix the starch and lignin fiber in the raw materials, heat and stir to obtain a premix, the stirring temperature is 19° C., the stirring time is 11 min, and additives are added to the premix, heated and stirred to obtain agglomerates, the stirring temperature is 51° C., the stirring time is 9 min, and mixing and stirring are performed using an internal mixer;

[0036] S03: Pre-foaming of the sub-groups by screw extrusion: The sub-groups are extruded by a screw extruder to obtain pre-foamed dough;

[0037] S04: High-temperature cavity die-casting: The pre-foamed dough is die-casted in a high-temperature cavity to obtain a foamed product. In the mold structure, the surface is a jellyfish triangle structure, which is relatively hydrophobic. The single-mold molding time is 42 seconds.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing a biomass foam product, characterized in that: The steps include: 1) Raw material preparation: prepare starch, lignin fiber and additives according to mass proportion; 2) Blending and stirring: preliminarily mixing starch and lignin fiber in the raw materials, heating and stirring to obtain a premix, adding additives to the premix, heating and stirring to obtain agglomerates; 3) Pre-foaming of the sub-groups by screw extrusion: The sub-groups are extruded by a screw extruder to obtain pre-foamed dough; 4) High-temperature die-casting: The pre-foamed dough is die-casted in a high-temperature die to obtain a foamed product.

2. The method for preparing a biomass foamed product according to claim 1, characterized in that: In the step 1), the lignin fibers account for at least 50% of the total mass.

3. A biomass foamed product and a preparation method thereof according to claim 1, characterized in that: The lignocellulose consists of wood pulp, bamboo powder, bagasse and straw.

4. A biomass foamed product and a preparation method thereof according to claim 1, characterized in that: In the step 2), an internal mixer is used for mixing and stirring.

5. A biomass foamed product and a preparation method thereof according to claim 1, characterized in that: In the step 4), the surface of the mold structure is a jellyfish triangle structure.

6. A biomass foamed product prepared by the method for preparing a biomass foamed product according to claim 1.

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