Method for preparing nano-crystalline cellulose enhanced polyvinyl alcohol foam material with oriented porous structure

A technology of nano-cellulose and polyvinyl alcohol, which is applied in the field of preparation of nano-cellulose-reinforced polyvinyl alcohol foam materials, can solve problems such as pollution, and achieve the effects of low energy consumption, improved compressive strength, and high mechanical properties

Inactive Publication Date: 2015-02-25
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, significant progress has been made in the use of nanocellulose to reinforce polymers such as polylactic acid, epoxy resin, and phenolic resin. The introduction of nanocellulose has improved the strength, modulus, stability, and thermal expansion of the polymer. However, the current research on nanocellulose-reinforced foam plastics focuses on polyurethane foam, and the research on nanocellulose-reinforced polyvinyl alcohol foam has not been reported yet.
Moreover, nanocellulose-reinforced polyurethane foam usually uses chemical methods, which need to add chemical reagents and foaming agents, which are likely to pollute the environment

Method used

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  • Method for preparing nano-crystalline cellulose enhanced polyvinyl alcohol foam material with oriented porous structure
  • Method for preparing nano-crystalline cellulose enhanced polyvinyl alcohol foam material with oriented porous structure
  • Method for preparing nano-crystalline cellulose enhanced polyvinyl alcohol foam material with oriented porous structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation method of the nanocellulose reinforced polyvinyl alcohol foam material of the oriented porous structure described in this embodiment comprises the following steps:

[0032] A, production of suspension mixture: a1 acid hydrolysis of pulp: immerse coniferous pulp in a sulfuric acid solution with a concentration of 64% at a temperature of 45°C, stir at a constant speed, and hydrolyze for 90 minutes, wherein the coniferous pulp is forest wood made from waste;

[0033] a2 Cleaning: add water to dilute to stop the reaction, remove the supernatant after standing for stratification, add water and let stand, repeat several times until sedimentation and stratification are difficult to occur, then transfer the suspension to the dialysis bag, and use deionized Soak and clean in water until neutral;

[0034] a3 Dispersion: Ultrasonic pulverize the suspension for 6 minutes, the ultrasonic power is 1000w, and then centrifuge at 10000rpm for 5 minutes, after centrifuga...

Embodiment 2

[0042] The steps of this embodiment are basically the same as those of Example 1, except that in step a4, polyvinyl alcohol particles are added to 85°C deionized water to form a 10% polyvinyl alcohol aqueous solution by mass ratio; nano whisker suspension in step a5 It is added into polyvinyl alcohol aqueous solution at a mass ratio of 3.0%.

[0043] The compression performance test method and the microscopic morphology observation method are the same as in Example 1. The stress-strain curve of the compressive performance test is shown in Figure 7 . The stress value when the strain is 50% is used as the compressive strength of the nanocellulose reinforced polyvinyl alcohol foam material with oriented porous structure, and the results are shown in Table 1. From Figure 4 As can be seen from the shown SEM pictures, the polyvinyl alcohol foam material prepared in Example 2 basically presents an oriented porous structure in the length direction, the wall layer structure basica...

Embodiment 3

[0045] The steps of this embodiment and embodiment 1 are basically the same, the difference is that in step a1, the hardwood pulp is immersed in a mixed solution with a temperature of 80 ° C, a concentration of sulfuric acid of 96%, and a concentration of hydrochloric acid of 36%, stirring at a constant speed, and hydrolysis 90min; in step a4, add polyvinyl alcohol particles into 95°C deionized water to form a polyvinyl alcohol aqueous solution with a mass ratio of 7%; in step a5, add the nano-whisker suspension to the polyvinyl alcohol aqueous solution at a mass ratio of 10.0% .

[0046] The compression performance test method and the microscopic morphology observation method are the same as in Example 1. The stress-strain curve of the compressive performance test is shown in Figure 7 . The stress value when the strain is 50% is used as the compressive strength of the nanocellulose reinforced polyvinyl alcohol foam material with oriented porous structure, and the results a...

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Abstract

The invention discloses a method for preparing nano-crystalline cellulose enhanced polyvinyl alcohol foam material with an oriented porous structure. The method comprises the following steps: A, preparation of suspension mixed liquid: performing acidolysis on plant paper pulp to prepare nanometer crystal whisker suspension liquid, and adding the nanometer crystal whisker suspension liquid into polyvinyl alcohol aqueous solution; B, oriented freezing: pouring the mixed liquid into a container and soaking into liquid nitrogen at the speed less than 0.2mm/s; C, low-temperature vacuum drying: after the growth of ice crystals in the mixed liquid is finished, instantly placing the container filled with the mixed liquid and taken out of the liquid nitrogen, into a vacuum freezing dryer, and taking out the container after the ice crystals are completely sublimated. The method only refers to physical phase change in a foaming process, any chemical medicaments are not used and any chemical reaction is avoided, the pollution to the environment in the foaming process is avoided, and the energy consumption is low. The prepared nano-crystalline cellulose enhanced polyvinyl alcohol foam material with the oriented porous structure has the micropore diameter range of 15-35 micrometers, and the compression strength is increased by 1.6-2 times in comparison with the compression strength of polyvinyl alcohol foam without the oriented structure.

Description

technical field [0001] The invention relates to a preparation method of a nano-cellulose reinforced polyvinyl alcohol foam material with an oriented porous structure. Background technique [0002] Polyvinyl alcohol (polyvinyl alcohol, PVA for short) is a water-soluble polymer obtained by alkali-catalyzed alcoholysis of polyvinyl acetate. Foamed PVA is a foam formed by cross-linking and foaming with PVA as the main raw material, adding cross-linking agent, acid catalyst, foaming agent or surfactant and other substances; it has strong polarity and is compatible with various materials. It has the advantages of good antistatic, biocompatibility, barrier property and solvent resistance, etc. It has great advantages in the preparation of filtration and adsorption materials for water treatment, sound insulation and heat insulation materials, soil moisturizing, preservation and multifunctional composite foam materials. Outstanding advantages. At present, PVA foam has been widely u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L1/02C08L29/04
Inventor 徐朝阳徐德良刘翔韩书广贾翀李大纲丁涛周兆兵韩景泉董会军石江涛徐丽
Owner NANJING FORESTRY UNIV
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