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Self-expanding lignofoam compositions and lignofoams made therefrom

A self-expanding, composite technology applied in the field of lignin foam

Pending Publication Date: 2020-10-27
US SEC AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the method of forming such lignin-containing foams suffers from the disadvantages inherent in lignin-containing foams

Method used

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  • Self-expanding lignofoam compositions and lignofoams made therefrom
  • Self-expanding lignofoam compositions and lignofoams made therefrom
  • Self-expanding lignofoam compositions and lignofoams made therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this example, 240 grams of kraft lignin (raw lignin) and 60 grams of poly(ethylene) powder were placed in a blender and mixed very well for 30 minutes. Then transfer the composition to figure 2 The molding chamber of the molding system. Experiments were performed as follows. The composition is cold pressed at a pressure between 0 (no pressure) and 10 MPa. The (pressed) composition is transferred in the forming chamber to the heating chamber and a metal plate is placed on the pressed composition, the metal plate exerting a pressure of 10-10,000 Pa. The heating chamber is then heated to a temperature of 200-260° C. at a rate of 5-20° C. / minute and held for 30-60 minutes. Next, the molding chamber is cooled to room temperature. These experiments produced open-celled, self-expanding lignin foams, which were subsequently removed from the mould. Results from a representative sample of lignin foam that had self-expanded are shown in Table 1 below.

Embodiment 2

[0035] In this example, 270 grams of kraft lignin (raw lignin) and 30 grams of polypropylene were placed in a mixer and mixed very thoroughly for 30 minutes. Then transfer the composition to figure 2 The molding chamber of the molding system. Experiments were performed as follows. The composition is cold pressed at a pressure between 0 (no pressure) and 10 MPa. The (pressed) composition is transferred in the forming chamber to the heating chamber and a metal plate is placed on the pressed composition, the metal plate exerting a pressure of 10-10,000 Pa. The heating chamber is then heated to a temperature of 220-260° C. at a rate of 5-20° C. / minute and held for 30-60 minutes. Next, the molding chamber is cooled to room temperature. These experiments produced open-celled, self-expanding lignin foams, which were subsequently removed from the mould. Results from a representative sample of lignin foam that had self-expanded are shown in Table 1 below.

Embodiment 3

[0037] In this example, 250 grams of kraft lignin (raw lignin) and 50 grams of poly(methyl methacrylate) were placed in a mixer and mixed very thoroughly for 30 minutes. Then transfer the composition to figure 2 The molding chamber of the molding system. Experiments were performed as follows. The composition is cold pressed at a pressure between 0 (no pressure) and 10 MPa. The (pressed) composition is transferred in the forming chamber to the heating chamber and a metal plate is placed on the pressed composition, the metal plate exerting a pressure of 10-10,000 Pa. The heating chamber is then heated to a temperature of 200-250° C. at a rate of 5-20° C. / minute and held for 30-60 minutes. Next, the molding chamber is cooled to room temperature. These experiments produced open-celled, self-expanding lignin foams, which were subsequently removed from the mould. Results from a representative sample of lignin foam that had self-expanded are shown in Table 1 below.

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PUM

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Abstract

Methods of making self-expanded lignofoams are provided. In embodiments, such a method comprises exposing a self-expanding lignofoam composition comprising raw lignin and a thermoplastic polymer to anelevated temperature for a period of time to soften the composition, desorb water from the raw lignin or induce at least some hydroxyl groups of the raw lignin to undergo dehydration reactions to generate water or both, vaporize the water, and generate pores throughout the softened composition. The method further comprises cooling the porous, softened composition to room temperature to provide the self-expanded lignofoam. The self-expanding lignofoam composition is free of an added plasticizer, an added lubricant, an added foaming agent, and an added blowing agent, and the thermoplastic polymer is not a starch, not a polyurethane, and not a polysiloxane. The resulting self-expanded lignofoams are also provided.

Description

[0001] Government Rights Reference [0002] This invention was made with government support under 18-RD-11111124-005 awarded by the USDA Forest Service. The government has certain rights in this invention. technical field [0003] The present invention relates to self-expanding lignin foam compositions and lignin foams prepared therefrom. Background technique [0004] Most foams are prepared using synthetic polymers and additives such as catalysts, blowing / blowing agents, surfactants and / or crosslinking agents to produce synthetic polymer foams. Some foams have been prepared using natural polymers such as lignin. However, such foams typically utilize pretreated lignin, relatively small amounts of lignin, and / or lignin covalently bound to other components of the foam (e.g., polymer components), for example, as monomeric components or crosslinking agent. Furthermore, the methods of forming such lignin-containing foams have disadvantages inherent to lignin-containing foams....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L97/00C08L23/06C08L23/12C08L33/12C08L59/00C08L69/00C08L33/20C08J9/12
CPCC08J9/125C08J9/0061C08J2397/00C08J2423/06C08J2423/12C08J2433/12C08J2459/00C08J2469/00C08J2433/20C08J2203/10C08J9/02C08J2471/02C08J2201/03C08L97/005C08J9/06
Inventor 蔡智勇严前古李旌豪
Owner US SEC AGRI
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