CN-122011588-A - Preparation method and application of boron-containing flame-retardant antibacterial polypropylene-based bamboo-plastic composite material

CN122011588ACN 122011588 ACN122011588 ACN 122011588ACN-122011588-A

Abstract

The invention discloses a preparation method of a boron-containing flame-retardant antibacterial polypropylene-based bamboo-plastic composite material. The method adopts modified aqueous solution containing boron component to carry out dipping treatment on the bamboo powder under the condition of stirring at normal temperature, so that boron element is successfully loaded on the surface and the inside of the bamboo powder, and the boron-containing bamboo powder with flame retardant and antibacterial functions is obtained. The mechanism is that the boron element can promote the composite material to form a compact and continuous protective carbon layer in the combustion process, effectively isolate heat and oxygen, thereby playing a role in high-efficiency flame retardance, and meanwhile, the introduced boron element has obvious antibacterial property. And then mixing the boron-containing bamboo powder with polypropylene resin and an intumescent flame retardant to obtain the bamboo-plastic composite material with excellent comprehensive performance. The method has the advantages of simple process and mild conditions, obviously improves the flame retardant and antibacterial properties of the composite material, and realizes the high-value utilization of the bamboo powder resources. The prepared composite material has wide application prospect in the fields of construction, home furnishing, packaging and the like.

Inventors

GU XIAOYU
WU LIANFENG
ZHANG KAI
LIU SHUHUI
ZHANG SHENG
YANG JINGJING

Assignees

北京化工大学

Dates

Publication Date: 20260512
Application Date: 20260316

Claims (7)

1. The boron-containing flame-retardant antibacterial polypropylene-based bamboo-plastic composite material is characterized by comprising polypropylene, modified bamboo powder and a flame retardant; The modified bamboo powder is obtained by dipping an aqueous solution containing a boron component; The boron-containing component is at least one selected from borax, boric acid, disodium octaborate and phenyldiboronic acid.
2. The polypropylene-based bamboo-plastic composite according to claim 1, wherein the polypropylene-based composite comprises the following components in parts by weight: 100 parts by weight of a mixture of polypropylene and modified bamboo powder, wherein the mass ratio of the polypropylene to the modified bamboo powder is 1:1; 14-26 parts of flame retardant piperazine pyrophosphate; The mesh number of the modified bamboo powder is 50-100 meshes.
3. A method for preparing the polypropylene-based bamboo-plastic composite material as claimed in claim 1, wherein the method comprises the following steps: (I) The preparation of the modified bamboo powder comprises the steps of adding a predetermined amount of bamboo powder into an aqueous solution of a boron-containing component, fully dispersing the bamboo powder under the stirring condition, and continuously carrying out dipping treatment. After the treatment is finished, carrying out suction filtration on the mixed solution, collecting bamboo powder solids, and sequentially carrying out washing and drying procedures to finally obtain a surface modified bamboo powder product. And (II) molding the composite material, namely weighing polypropylene, the obtained modified bamboo powder and the flame retardant according to a proportion, and putting the mixture into mixing equipment for fully and uniformly mixing. Transferring the mixed material into a double-screw extruder for melt blending, extrusion and granulation to obtain the bamboo-plastic composite master batch. And then, processing the master batch through an injection molding process to obtain the target polypropylene-based bamboo-plastic composite material.
4. The preparation method according to claim 3, wherein in the step (I), the mass fraction of the boron-containing solution is 10-30 wt%; The ratio of the bamboo powder to the aqueous solution of the boron-containing component is 5-15 g, 100 mL; The soaking time of the bamboo powder in the boron-containing aqueous solution is 30 min; The soaking temperature of the bamboo powder in the boron-containing aqueous solution is 20-30 ℃; the drying temperature is 60-80 ℃; And the drying time is 24-48 hours.
5. The method according to claim 3, wherein the twin-screw extruder has a screw speed of 80 to 100 rpm; the temperature of a charging barrel of the double-screw extruder is 170-190 ℃; The injection molding temperature is 170-190 ℃; The injection molding pressure is 3-6 bar.
6. An article characterized in that the article is made of the polypropylene-based bamboo-plastic composite material prepared by the preparation method according to any one of claims 1 to 5.
7. The article of claim 6, wherein the article is a building, a home, and a package.

Description

Preparation method and application of boron-containing flame-retardant antibacterial polypropylene-based bamboo-plastic composite material Technical Field The invention relates to the technical field of polymer flame-retardant antibacterial composite materials, in particular to a preparation method and application of a boron-containing flame-retardant antibacterial polypropylene-based bamboo-plastic composite material. Background In the field of building timber, bamboo is regarded as an ideal choice for replacing timber due to the advantages of rapid growth, reproducibility, large reserve, high specific strength and the like, and is helpful for relieving the contradiction between domestic timber supply and demand. However, bamboo is easy to absorb moisture and grow mould, so that the bamboo has the defect of insufficient durability in application. On the other hand, plastic materials represented by polypropylene, although being outstanding in terms of weight reduction, corrosion resistance and processing economy, are difficult to degrade in natural environment after being discarded, resulting in an increasingly outstanding problem of "white pollution". The bamboo and plastic composite material is prepared by compounding bamboo and plastic, and complementary advantages can be realized, so that the biological degradation of the bamboo is restrained, and the pure consumption of the plastic is reduced. The material has remarkable industrial practicability and is an important development direction for relieving the dual pressure of resources and environment. In addition, the flame retardancy of bamboo-plastic composites is also a challenge. The bamboo powder and the polypropylene are both combustible materials, and the composite system has high flame propagation speed and high fire safety hidden trouble, so that the application of the composite system in the field with higher requirements on flame retardance is severely limited. Disclosure of Invention Aiming at the defects of the existing bamboo-plastic composite material in flame retardance and antibacterial performance, the invention provides a preparation method of a boron-containing flame-retardant antibacterial polypropylene-based bamboo-plastic composite material with simple and convenient process and excellent performance. The method is characterized in that functional modification is firstly carried out on the bamboo powder, and specifically, the bamboo powder is placed in aqueous solution containing boron at normal temperature for stirring and dipping treatment, so that boron element is effectively loaded in the bamboo powder, and the boron-containing bamboo powder with flame retardant and antibacterial functions is prepared. And then, carrying out melt blending and extrusion molding on the boron-containing bamboo powder, polypropylene resin and an intumescent flame retardant to finally obtain the target composite material. The invention provides the following technical scheme that in one aspect, the invention provides a method for modifying bamboo powder by using an aqueous solution containing boron. Further, the mass fraction of the boron-containing component in the solution is 10-30wt%. Further, the mass fraction of the bamboo powder in the boron-containing aqueous solution is 5-15 wt%. Further, the boron-containing component is selected from one of borax, boric acid, disodium octaborate and phenyldiboronic acid. In yet another aspect, the present invention provides a method for modifying bamboo powder as described above, comprising the steps of: dissolving a boron-containing component in water to obtain a boron-containing aqueous solution; and soaking the bamboo powder by the boron-containing aqueous solution to obtain the modified bamboo powder. Further, the soaking time of the bamboo powder in the boron-containing aqueous solution is 30 min; The soaking temperature of the bamboo powder in the boron-containing aqueous solution is 20-30 ℃; the drying temperature is 60-80 ℃; And the drying time is 24-48 hours. Further, the preparation method comprises the following steps: S1, dissolving the boron-containing component in deionized water at room temperature by adopting magnetic stirring (500 rpm) for 30: 30 min. And S2, adding a predetermined amount of bamboo powder into the aqueous solution of the boron-containing component, and fully dispersing the bamboo powder under the stirring condition and continuously carrying out the dipping treatment. After the treatment is finished, carrying out suction filtration on the mixed solution, collecting bamboo powder solids, and sequentially carrying out washing and drying procedures to finally obtain a surface modified bamboo powder product. In still another aspect, the invention provides a preparation method of a boron-containing flame-retardant antibacterial polypropylene-based bamboo-plastic composite material, which comprises polypropylene and the modified bamboo powder according to any one of claims 3-5. Fu