阅读说明：本技术 一种生物基泡沫填充纸蜂窝板材复合材料的制备方法 (Preparation method of bio-based foam filling paper honeycomb plate composite material ) 是由 王冬梅 张宇 于 2020-12-29 设计创作，主要内容包括：本发明涉及复合材料制备的技术领域,特别是涉及一种生物基泡沫填充纸蜂窝板材复合材料的制备方法,以解决现有技术中使用聚氨酯泡沫使得纸蜂窝板材从原来的绿色环保材料变成无法降解、不易分离回收的的材料,改变了纸蜂窝板材的生物降解性,由于聚氨酯泡沫流动性太差,导致无法完全填满蜂窝六边形孔,填充过程不易控制的问题；包括以下步骤：S1、准备明胶泡沫材料；S2、明胶泡沫液体发泡；S3、明胶泡沫填充纸蜂窝芯材；S4、明胶泡沫填充纸蜂窝复合材料干燥。(The invention relates to the technical field of composite material preparation, in particular to a preparation method of a bio-based foam filling paper honeycomb plate composite material, which solves the problems that in the prior art, polyurethane foam is used to change a paper honeycomb plate from an original green environment-friendly material into a material which cannot be degraded and is difficult to separate and recycle, the biodegradability of the paper honeycomb plate is changed, and because the flowability of the polyurethane foam is too poor, honeycomb hexagonal holes cannot be completely filled, and the filling process is difficult to control; the method comprises the following steps: s1, preparing a gelatin foam material; s2, foaming gelatin foam liquid; s3, filling a paper honeycomb core material with gelatin foam; s4, drying the gelatin foam filled paper honeycomb composite material.)

1. The preparation method of the bio-based foam filled paper honeycomb plate composite material is characterized by comprising the following steps of:

s1, preparing gelatin foam material: adopting B-type gelatin and pregelatinized starch, using sodium dodecyl sulfate as a surfactant, using dilute hydrochloric acid and a sodium hydroxide solution to adjust the pH value, dissolving the gelatin, the pregelatinized starch, the sodium dodecyl sulfate and water according to a proportion, wherein the solid content is 15 wt%, adjusting the pH value by using the dilute hydrochloric acid and the sodium hydroxide solution to enable the pH value of the solution to be 5.5, simultaneously heating the solution to fully dissolve the B-type gelatin and the pregelatinized starch until the temperature of the solution reaches 50 ℃, and continuing to heat the solution at a constant temperature for 10min to prepare the solution;

s2, foaming of gelatin foam liquid: performing liquid foaming on the solution prepared in the step S1 by using a stirrer, sufficiently and quickly stirring the solution, uniformly injecting air into the solution, and foaming for 5min until the liquid foam is completely foamed and the volume of the foam is not increased any more;

s3, filling a gelatin foam into a paper honeycomb core material: preparing a die with the same length, width and height as the honeycomb paperboard, pouring liquid foam into the die, immediately paving and pressing the core material of the honeycomb paperboard into the foam, wherein the gelatin/starch foam is foam, so that the foam can be immediately and uniformly filled into the core holes of the paper honeycomb core material to prepare the gelatin foam filled paper honeycomb composite material;

s4, drying the gelatin foam filled paper honeycomb composite material: and (4) placing the gelatin foam filled paper honeycomb composite material prepared in the step (S3) in a constant temperature and humidity box, adopting a room temperature condition until the composite material is completely dried, and demolding the composite material to obtain the bio-based foam filled paper honeycomb composite material.

2. The method for preparing a bio-based foam filled paper honeycomb panel composite material as claimed in claim 1, wherein the mass ratio of the type B gelatin/starch in the step S1 is 7: 3, the amount of SDS added was 0.75 wt%.

3. The method for preparing a bio-based foam filled paper honeycomb panel composite material as claimed in claim 2, wherein the room temperature condition in the step S4 is temperature: 23 ℃, humidity: 50 percent.

4. The method for preparing a bio-based foam filled paper honeycomb panel composite material as claimed in claim 3, wherein the power of the stirrer in the step S2 is 800W, and the stirring speed is 18000 r/min.

5. The method of claim 4, wherein the solution is mechanically stirred at a speed of 1000r/min while being heated in step S1.

Technical Field

The invention relates to the technical field of composite material preparation, in particular to a preparation method of a bio-based foam filled paper honeycomb plate composite material.

Background

As is well known, foam and honeycomb are porous light materials and have wide applications in various engineering fields. Under the condition of the same density, the foam material has better buffering and energy absorbing effects than the honeycomb core material, but has poorer bearing capacity. The honeycomb core has high specific strength and specific modulus, has stronger bearing capacity than a foam material, but has poorer buffering and energy-absorbing effects. And the dynamic mechanical property of the material can be greatly improved by combining the foam material and the honeycomb material. Foam filled honeycomb materials (FFH) prepared by filling Foam into honeycombs can exert respective advantages, and obtain higher bearing capacity and better buffering and energy absorption effects.

The paper honeycomb is a nonmetal porous interlayer buffer material, has the characteristics of light weight, simple process, low cost, good environmental protection, strong bearing capacity, good impact resistance and the like, is widely applied to the field of product protection and packaging engineering, and can greatly improve the mechanical property of the paper honeycomb by filling the paper honeycomb with foam. Research has already been carried out on filling the polyurethane foam into the honeycomb paperboard, which proves that the mechanical property of the board can be greatly improved by the foam-filled paper honeycomb board, but the polyurethane foam is used to change the paper honeycomb board from the original green environment-friendly material into a material which can not be degraded and is not easy to separate and recycle, so that the biodegradability of the paper honeycomb board is changed. Because the flowability of the polyurethane foam is too poor, the hexagonal honeycomb holes cannot be completely filled, and the filling process is not easy to control.

Disclosure of Invention

In order to solve the technical problems, the invention provides a preparation method of a bio-based foam filled paper honeycomb plate composite material, which aims to solve the problems that in the prior art, the paper honeycomb plate is changed from an original green environment-friendly material into a material which cannot be degraded and is difficult to separate and recycle by using polyurethane foam, the biodegradability of the paper honeycomb plate is changed, hexagonal honeycomb holes cannot be completely filled due to poor flowability of the polyurethane foam, and the filling process is difficult to control.

The invention discloses a preparation method of a bio-based foam filled paper honeycomb plate composite material, which comprises the following steps:

s1, preparing gelatin foam material: adopting B-type gelatin and pregelatinized starch, using sodium dodecyl sulfate as a surfactant, using dilute hydrochloric acid and a sodium hydroxide solution to adjust the pH value, dissolving the gelatin, the pregelatinized starch, the sodium dodecyl sulfate and water according to a proportion, wherein the solid content is 15 wt%, adjusting the pH value by using the dilute hydrochloric acid and the sodium hydroxide solution to enable the pH value of the solution to be 5.5, simultaneously heating the solution to fully dissolve the B-type gelatin and the pregelatinized starch until the temperature of the solution reaches 50 ℃, and continuing to heat the solution at a constant temperature for 10min to prepare the solution;

s2, foaming of gelatin foam liquid: performing liquid foaming on the solution prepared in the step S1 by using a stirrer, sufficiently and quickly stirring the solution, uniformly injecting air into the solution, and foaming for 5min until the liquid foam is completely foamed and the volume of the foam is not increased any more;

s3, filling a gelatin foam into a paper honeycomb core material: preparing a die with the same length, width and height as the honeycomb paperboard, pouring liquid foam into the die, immediately paving and pressing the core material of the honeycomb paperboard into the foam, wherein the gelatin/starch foam is foam, so that the foam can be immediately and uniformly filled into the core holes of the paper honeycomb core material to prepare the gelatin foam filled paper honeycomb composite material;

s4, drying the gelatin foam filled paper honeycomb composite material: and (4) placing the gelatin foam filled paper honeycomb composite material prepared in the step (S3) in a constant temperature and humidity box, adopting a room temperature condition until the composite material is completely dried, and demolding the composite material to obtain the bio-based foam filled paper honeycomb composite material.

According to the preparation method of the bio-based foam filling paper honeycomb plate composite material, the mass ratio of the B-type gelatin to the starch in the step S1 is 7: 3, the amount of SDS added was 0.75 wt%.

The invention relates to a preparation method of a bio-based foam filling paper honeycomb plate composite material, wherein in the step S4, the room temperature condition is as follows: 23 ℃, humidity: 50 percent.

According to the preparation method of the bio-based foam filling paper honeycomb plate composite material, the power of the stirrer in the step S2 is 800W, and the stirring speed is 18000 r/min.

According to the preparation method of the bio-based foam filled paper honeycomb plate composite material, when the solution is heated in the step S1, the solution is mechanically stirred at the speed of 1000 r/min.

Compared with the prior art, the invention has the beneficial effects that: 1. the prepared bio-based foam is gelatin/starch foam, and the foam is liquid foam when foaming is finished, so that hexagonal holes of the honeycomb paperboard can be completely filled, and the filling process is simple;

2. the gelatin/starch foam prepared by the invention has the advantages that the raw materials are wastes of animals and plants, the sources are wide, the cost is low, the prepared foam is light in weight, good in mechanical property, capable of performing household composting and completely biodegradable, and the biodegradability of the prepared bio-based foam filled honeycomb paperboard composite material is not changed.

Detailed Description

The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Example (b):

s1, preparing gelatin foam material: adopting B type gelatin and pregelatinized starch, using sodium dodecyl sulfate as a surfactant, using dilute hydrochloric acid and sodium hydroxide solution to adjust the pH value, and dissolving the gelatin, the pregelatinized starch, the sodium dodecyl sulfate and water according to the proportion, wherein the solid content is 15 wt%, and the mass ratio of the B type gelatin to the starch is 7: 3, adding 0.75 wt% of SDS, adjusting the pH value by using dilute hydrochloric acid and a sodium hydroxide solution to enable the pH value of the solution to be 5.5, mechanically stirring the solution at the speed of 1000r/min, heating the solution at the same time to fully dissolve the B-type gelatin and the pregelatinized starch until the temperature of the solution reaches 50 ℃, and continuing to heat the solution at constant temperature for 10min to prepare the solution;

s2, foaming of gelatin foam liquid: carrying out liquid foaming on the solution prepared in the step S1 by using a stirrer, fully and quickly stirring the solution, wherein the power of the stirrer is 800W, the stirring speed is 18000r/min, air is uniformly injected into the solution, foaming is carried out for 5min until liquid foam is completely foamed, and the volume of the foam is not increased any more;

s3, filling a gelatin foam into a paper honeycomb core material: preparing a die with the same length, width and height as the honeycomb paperboard, pouring liquid foam into the die, immediately paving and pressing the core material of the honeycomb paperboard into the foam, wherein the gelatin/starch foam is foam, so that the foam can be immediately and uniformly filled into the core holes of the paper honeycomb core material to prepare the gelatin foam filled paper honeycomb composite material;

s4, drying the gelatin foam filled paper honeycomb composite material: placing the gelatin foam filled paper honeycomb composite material prepared in the step S3 in a constant temperature and humidity box, and adopting the room temperature conditions: temperature: 23 ℃, humidity: and 50% until the composite material is completely dried, and demolding the composite material to obtain the bio-based foam filled paper honeycomb composite material.

The composite material prepared by the method has a flat surface, and the bio-based foam is completely filled in the honeycomb cells after cutting inspection.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.