CN109135303B - Preparation method of nano-cellulose reinforced soybean oil-based foam plastic - Google Patents
Preparation method of nano-cellulose reinforced soybean oil-based foam plastic Download PDFInfo
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- CN109135303B CN109135303B CN201810962874.3A CN201810962874A CN109135303B CN 109135303 B CN109135303 B CN 109135303B CN 201810962874 A CN201810962874 A CN 201810962874A CN 109135303 B CN109135303 B CN 109135303B
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
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Abstract
The invention discloses a preparation method of nano-cellulose reinforced soybean oil-based foam plastic, which comprises the following operation steps: (1) preparing nano cellulose suspension with mass concentration of 0.5-4%; adding sodium bicarbonate powder into the nano cellulose suspension until the mass concentration is 1-10%, and magnetically stirring for 1h at room temperature to prepare a water phase; (2) epoxidized soybean oil acrylate: amino silane: benzoyl peroxide 1: 0.1-0.5: 0.004-0.01, and magnetically stirring at room temperature for 10min to prepare an oil phase; (3) stirring and mixing the oil phase and the water phase at a high speed according to a mass ratio of 1: 1-5: 1 to prepare a soybean oil-based foaming liquid; (4) pouring the soybean oil-based foaming liquid into a mould, heating to enable the foaming liquid to foam and solidify to form the foam plastic. The method has simple and environment-friendly process, the process of adding the nano-cellulose is beneficial to foaming and enhancing the foam stability, and the prepared soybean oil-based foam plastic has excellent comprehensive performance and can be applied to the fields of heat insulation buffer materials and the like.
Description
Technical Field
The invention belongs to the technical field of foam plastic preparation, and particularly relates to a preparation method of nano-cellulose reinforced soybean oil-based foam plastic.
Background
The foam plastic is widely applied to the fields of packaging and transportation, buildings, furniture and the like as a damping, buffering, heat insulation and sound insulation material. The traditional foamed plastic is mainly prepared by taking petroleum derivatives such as phenolic resin, unsaturated resin, epoxy resin and the like as raw materials. The foam plastic has the problems of non-regeneration, difficult natural degradation of waste and the like, and brings serious burden to the environment. Therefore, the preparation of biodegradable foam plastic by using renewable resources as raw materials has important significance.
Soybean oil has the characteristics of abundant sources, low price and the like, and people are increasingly attracting attention to the preparation of biodegradable high polymer materials by taking the soybean oil as a raw material. Epoxy soybean oil Acrylate (AESO) is a derivative of natural soybean oil, has a plurality of excellent performances such as low price, good hydrophobic film-forming performance, environmental friendliness and the like, and shows great development potential in the fields of coatings, biodegradable foams, composite materials and the like.
At present, there are many reports of using epoxidized soybean oil acrylate to prepare polymer foam by foaming, for example, AESO and a diluent styrene are copolymerized and foamed to form foam (Chinese plastics, 2006, 20(5)), maleic anhydride-acrylic acid modified epoxidized soybean oil resin and styrene are copolymerized by free radicals to prepare environment-friendly foam, and the like (polymer science, 2014(4): 540-. However, the preparation of the nano-cellulose reinforced soybean oil-based foam plastic by preparing the soybean oil-based foaming liquid by a particle emulsification method and then foaming the soybean oil-based foaming liquid has not been reported.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of nano-cellulose reinforced soybean oil-based foam plastic, the method adopts a process of adding nano-cellulose, which is beneficial to foaming and enhancing the foam stability, can further improve the mechanical property of the foam plastic, and the obtained foam plastic has the excellent characteristics of nano-cellulose and the AESO hydrophobic reaction performance.
The invention solves the technical problems by the following technical scheme:
the invention relates to a preparation method of nano-cellulose reinforced soybean oil-based foam plastic, which comprises the following operation steps:
(1) preparation of an aqueous phase: adding nano-cellulose into deionized water, and dispersing for 5min at the rotating speed of 8000rpm by using a high-speed dispersion machine to prepare nano-cellulose suspension with the mass concentration of 0.5-4%; adding sodium bicarbonate powder into the nano cellulose suspension until the mass concentration is 1-10%, magnetically stirring for 1h at room temperature, and uniformly mixing to prepare a water phase;
(2) preparing an oil phase: the epoxy soybean oil acrylate, the aminosilane and the benzoyl peroxide are as follows according to the mass ratio: epoxy soybean oil acrylate AESO, amino silane and benzoyl peroxide are added in a ratio of 1: 0.1-0.5: 0.004-0.01, and the mixture is magnetically stirred for 10min at room temperature to prepare an oil phase;
(3) preparing soybean oil base foaming liquid: mixing the oil phase in the step (2) and the water phase in the step (1) according to the mass ratio: mixing an oil phase and a water phase at a ratio of 1: 1-5: 1, stirring and mixing at room temperature by using a high-speed emulsifying machine, wherein the stirring speed is 5000-15000 r/min, and the stirring time is 5-10 min, so as to prepare the soybean oil-based foaming liquid;
(4) pouring the soybean oil-based foaming liquid prepared in the step (3) into a mould, and heating at 80-110 ℃ for 30-60 min to foam and solidify to form the foamed plastic.
In the step (1), the nano-cellulose is prepared from bleached softwood fiber, bleached hardwood fiber, bleached bagasse fiber, bleached bamboo fiber or cotton fiber by a mechanical grinding method, a high-pressure homogenization method or a chemical oxidation method, and the nano-cellulose with the diameter of 2-20nm and the length of 0.1-100 mu m is obtained.
In the step (2), the aminosilane includes aminopropyltriethoxysilane and aminopropyltrimethoxysilane.
Compared with the prior art, the invention has the following advantages:
1) the preparation process is simple, environment-friendly, low in cost and high in practicability, and the process of adding the nano-cellulose is beneficial to foaming and enhancing the stability of foam, so that the mechanical property of the foam plastic can be further improved, the cost can be reduced, and the biodegradability of the foam can be improved.
2) The nano-cellulose reinforced soybean oil-based foam plastic obtained by the method has the excellent characteristics of nano-cellulose and the AESO hydrophobic reaction performance, can be foamed and cured under mild conditions to form foam plastic, has excellent comprehensive performance, and can be applied to the fields of buffer packaging materials, heat-insulating and sound-insulating materials and the like.
Drawings
FIG. 1 is an SEM micrograph of the nanocellulose-reinforced soy oil-based foam prepared in example 1.
Detailed Description
The following examples are intended to better illustrate the invention, but the scope of protection of the invention is not limited to the following examples:
example 1
Preparing nano-cellulose with the diameter of 2-20nm and the length of 0.1-100 mu m by using bleached bagasse fiber as a raw material through a mechanical grinding method; adding the nano-cellulose into deionized water, and dispersing for 5min at the rotating speed of 8000rpm by using a high-speed dispersion machine to prepare nano-cellulose suspension with the mass concentration of 3%; adding sodium bicarbonate powder into the nano cellulose suspension until the mass concentration is 5%, magnetically stirring for 1h at room temperature, and uniformly mixing to prepare a water phase; the epoxy soybean oil acrylate AESO, the aminosilane and the benzoyl peroxide are as follows according to the mass ratio: epoxidized soybean oil acrylate AESO: aminopropyltrimethoxysilane: benzoyl peroxide 1: 0.2: 0.004, and magnetically stirring for 10min at room temperature to prepare an oil phase; mixing the oil phase and the water phase according to a mass ratio of 1:1, stirring and mixing by using a high-speed emulsifying machine at room temperature, wherein the stirring speed is 8000r/min, and the stirring time is 8min, so as to prepare the soybean oil-based foaming liquid; pouring the soybean oil-based foaming liquid into a mould, heating at 90 ℃ for 40min to foam and solidify to form the foam plastic.
The density of the nanocellulose-reinforced soy oil-based foam prepared in this example was 0.12g/cm3The compressive strength is 574kPa, and the weight loss rate after 90 days of soil burying is 20.5 percent.
Example 2
Preparing nano cellulose with the diameter of 2-20nm and the length of 0.1-1 mu m by using cotton linter microcrystalline fibers as a raw material and adopting a high-pressure homogenization method; adding the nano-cellulose into deionized water, and dispersing for 5min at the rotating speed of 8000rpm by using a high-speed dispersion machine to prepare nano-cellulose suspension with the mass concentration of 0.5%; adding sodium bicarbonate powder into the nano cellulose suspension until the mass concentration of the sodium bicarbonate powder is 10%, magnetically stirring for 1h at room temperature, and uniformly mixing to prepare a water phase; the epoxy soybean oil acrylate AESO, the aminosilane and the benzoyl peroxide are as follows according to the mass ratio: epoxidized soybean oil acrylate AESO: aminopropyltriethoxysilane: benzoyl peroxide 1: 0.1: 0.01, and magnetically stirring for 10min at room temperature to prepare an oil phase; mixing the oil phase and the water phase according to a mass ratio of 2:1, stirring and mixing by using a high-speed emulsifying machine at room temperature, wherein the stirring speed is 5000r/min, and the stirring time is 10min, so as to prepare the soybean oil-based foaming liquid; pouring the soybean oil-based foaming liquid into a mould, heating at 110 ℃ for 30min to foam and solidify to form the foam plastic.
The density of the nanocellulose-reinforced soy oil-based foam prepared in this example was 0.19g/cm3The compressive strength is 1074kPa, and the weight loss rate after 90 days of soil burying is 19.9%.
Example 3
Preparing nano cellulose with the diameter of 2-20nm and the length of 0.1-100 mu m by using bleached hardwood fibers as a raw material through a chemical oxidation method; adding the nano-cellulose into deionized water, and dispersing for 5min at the rotating speed of 8000rpm by using a high-speed dispersion machine to prepare nano-cellulose suspension with the mass concentration of 1.5%; adding sodium bicarbonate powder into the nano cellulose suspension until the mass concentration is 1%, magnetically stirring for 1h at room temperature, and uniformly mixing to prepare a water phase; the epoxy soybean oil acrylate AESO, the aminosilane and the benzoyl peroxide are as follows according to the mass ratio: epoxidized soybean oil acrylate AESO: aminopropyltrimethoxysilane: benzoyl peroxide 1: 0.3: 0.008, and magnetically stirring for 10min at room temperature to prepare an oil phase; mixing the oil phase and the water phase according to a mass ratio of 5:1, stirring and mixing by using a high-speed emulsifying machine at room temperature, wherein the stirring speed is 10000r/min, and the stirring time is 5min, so as to prepare the soybean oil-based foaming liquid; pouring the soybean oil-based foaming liquid into a mould, heating at 80 ℃ for 60min to foam and solidify to form the foam plastic.
The density of the nanocellulose-reinforced soy oil-based foam prepared in this example was 0.33g/cm3The compressive strength is 1943kPa, and the weight loss rate after 90 days of soil burying is 17.6%.
Example 4
Preparing nano cellulose with the diameter of 2-20nm and the length of 0.1-100 mu m by using bleached softwood fibers as raw materials and adopting a mechanical grinding method; adding the nano-cellulose into deionized water, and dispersing for 5min at the rotating speed of 8000rpm by using a high-speed dispersion machine to prepare nano-cellulose suspension with the mass concentration of 4%; adding sodium bicarbonate powder into the nano cellulose suspension until the mass concentration is 5%, magnetically stirring for 1h at room temperature, and uniformly mixing to prepare a water phase; the epoxy soybean oil acrylate AESO, the aminosilane and the benzoyl peroxide are as follows according to the mass ratio: epoxidized soybean oil acrylate AESO: aminopropyltriethoxysilane: benzoyl peroxide 1: 0.5: 0.01, and magnetically stirring for 10min at room temperature to prepare an oil phase; mixing the oil phase and the water phase according to a mass ratio of 3:1, stirring and mixing by using a high-speed emulsifying machine at room temperature, wherein the stirring speed is 15000r/min, and the stirring time is 5min, so as to prepare the soybean oil-based foaming liquid; pouring the soybean oil-based foaming liquid into a mould, heating at 100 ℃ for 30min to foam and solidify to form the foam plastic.
The density of the nanocellulose-reinforced soy oil-based foam prepared in this example was 0.25g/cm3The compressive strength is 1336kPa, and the weight loss rate after 90 days of soil burying is 11.8%.
Claims (2)
1. The preparation method of the nano-cellulose reinforced soybean oil-based foam plastic is characterized by comprising the following operation steps:
(1) preparation of an aqueous phase: adding nano-cellulose into deionized water, and dispersing for 5min at the rotating speed of 8000rpm by using a high-speed dispersion machine to prepare nano-cellulose suspension with the mass concentration of 0.5-4%; adding sodium bicarbonate powder into the nano cellulose suspension until the mass concentration is 1-10%, magnetically stirring for 1h at room temperature, and uniformly mixing to obtain a water phase;
(2) preparing an oil phase: the epoxy soybean oil acrylate, the aminosilane and the benzoyl peroxide are as follows according to the mass ratio: mixing epoxy soybean oil acrylate, aminosilane and benzoyl peroxide in a ratio of =1: 0.1-0.5: 0.004-0.01, and magnetically stirring for 10min at room temperature to prepare an oil phase; the amino silane is aminopropyl triethoxysilane or aminopropyl trimethoxysilane;
(3) preparing soybean oil base foaming liquid: mixing the oil phase in the step (2) and the water phase in the step (1) according to the mass ratio: mixing an oil phase and a water phase, wherein the ratio of the water phase to the water phase is =1: 1-5: 1, stirring and mixing the mixture at room temperature by using a high-speed emulsifying machine, wherein the stirring speed is 5000 r/min-15000 r/min, and the stirring time is 5 min-10 min, so as to prepare the soybean oil-based foaming liquid;
(4) pouring the soybean oil-based foaming liquid prepared in the step (3) into a mould, and heating at 80-110 ℃ for 30-60 min to foam and solidify to form the foamed plastic.
2. The method for preparing nanocellulose-reinforced soybean oil-based foam according to claim 1, wherein in step (1), the nanocellulose is prepared from bleached softwood fiber, bleached hardwood fiber, bleached bagasse fiber or cotton fiber by mechanical grinding, high pressure homogenization or chemical oxidation to obtain nanocellulose with a diameter of 2-20nm and a length of 0.1-100 μm.
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| CN112337192B (en) * | 2020-09-16 | 2021-12-07 | 齐鲁工业大学 | Efficient filtering material containing foaming coating and preparation method and application thereof |
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