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A kind of cellulose-based profile and processing technology

A cellulose and hemicellulose technology, used in wood processing appliances, pretreatment of molding materials, manufacturing tools, etc., can solve the problems of low binder strength, difficult mixing of wood-plastic materials, affecting strength, etc., and achieve bending stress. Large, reduce production cost, improve strength and toughness effect

Active Publication Date: 2022-08-09
XIAMEN UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to give full play to the high-strength mechanical properties of the original color paste separated from the bamboo / wood material. The cracked artificial fiber board has low strength, wood-plastic materials are difficult to mix, the addition of fiber materials is low, and the cracked resin and fiber materials are difficult to mix evenly and high temperature. A series of problems such as hot pressing water loss affecting strength, etc., solve the problems in the use of urea-formaldehyde resin, phenolic resin and soybean protein resin binders such as low strength, formaldehyde toxicity and other series of bio-based composite materials, and develop high strength, green environmental protection, flame retardant performance Good adhesives and bio-based materials and new technologies for recombination

Method used

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  • A kind of cellulose-based profile and processing technology
  • A kind of cellulose-based profile and processing technology
  • A kind of cellulose-based profile and processing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1. Cook bamboo slices with 13% NaOH solution at 75°C for 10-12 hours, and then rub and refine the pulp to obtain a bamboo color paste with a moisture content of 60% and a pH of 9-10, acidify to a pH of 2-3, and clean it with water. Washed cleanly, screened the pulp, and decomposed by a fiber defibrillator to prepare a pulp with a pulp concentration of 1% for use. The mass content of cellulose (containing hemicellulose) in the bamboo pulp (on a dry weight basis) after acidification was measured to be 58.98%, and the content of acid-insoluble wood was 23.96%.

[0052] 2. Add PVC pellets or PLA pellets with a particle size of less than 300 meshes in proportion and mix them evenly. After aging and pre-pressing for 20 minutes, a pulp skeleton substrate with a thickness of 15±1mm is obtained. The schematic diagram of the three-dimensional structure of the pulp skeleton substrate is shown in the appendix figure 1 .

[0053] 3. The pulp skeleton base material is hot-pressed, ...

Embodiment 2

[0062] 1. The pulping method is the same as the step 1 of the above-mentioned embodiment 1.

[0063] 2. Add ultrafine CaCO in proportion 4 or / and CaSO 4 The powder is mixed evenly, aged, pre-pressed for 20 minutes, and dried at <100 °C.

[0064] 3. Add PVA solution in proportion, and dry at <100℃.

[0065] 4. The pulp skeleton base material is hot-pressed, pressure-maintained and cooled to obtain the product. The specific properties are shown in Table 3.

[0066] Table 3 Preparation conditions and product properties of PVA-natural paste

[0067]

[0068] The results in Table 3 show that: the PVA-fiber-based composite material with an addition amount of less than 15%, without adding nano-calcium material, the mass ratio of the sum of the mass of the viscous polymer PVA and acid-insoluble lignin to the mass of cellulose is 0.69 (the mass ratio of cellulose and viscous polymer is 1.45), its static bending strength and elastic modulus are far better than the static bending ...

Embodiment 3

[0071] 1. Cook the wood chips with 13% NaOH solution at 75°C for 10-12 hours, and then rub and refine the pulp to obtain a wood color pulp with a moisture content of 60% and a pH of 9-10, and measure the fiber in the wood color pulp (by dry weight). The mass content of cellulose (containing hemicellulose) was 83.07%, and the content of acid-insoluble wood was 6.02%. , supplement the by-product sodium lignin solution, mix evenly in proportion, acidify, wash and dry.

[0072] 2. Add a certain proportion of polyvinyl alcohol with a concentration of 2% according to the proportion, stick kraft paper with a thickness of 0.4mm on the upper and lower layers, and use 4g of styrene-acrylic emulsion for the adhesive layer.

[0073] 3. The product is obtained by hot pressing, pressure-holding cooling, and the specific properties are shown in Table 4.

[0074] Table 4 Preparation conditions and product properties of natural color paste materials

[0075]

[0076] The results in Table ...

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Abstract

The invention relates to a cellulose-based profile and a processing technology. The profile comprises cellulose and a viscous polymer, the static bending strength of the profile is 40-150MPa, the elastic modulus is 4000-15000Mpa, and the cellulose and the viscous polymer are 40-150MPa. The mass ratio of 1:(0.01‑100). Using pulp as a one-dimensional basic structural unit, lignin or synthetic material powder or common binder solution can be added for dispersion or impregnation, and then conventional operations such as drying, paving, and hot pressing can produce new composite profiles. or profiled material. The invention uses the biological macromolecules with one-dimensional fibrous structure characteristics in the plant tissue structure as the skeleton, and expands the use of synthetic resin or acidified lignin as the adhesive. Moisture, reheating and pressing molding process can produce large-scale and low-cost new types of sheets, pipes and profiles with cost-effective bio-based materials as the main component.

Description

technical field [0001] The invention relates to the field of bio-based composite materials, in particular to a cellulose-based profile and a processing technology. Background technique [0002] Biomass materials are the fundamental direction of human future development, which can best meet the requirements of environmental friendliness, ecological health, safe use and sustainable development. Biomass raw materials are abundant, and wood or bamboo construction and furniture have been used for thousands of years. Biomass such as bamboo and straw have different sizes, poor uniformity of structure and density, anisotropy, and defects in bonding materials, so the utilization rate has not been high. Papermaking, one of the four ancient inventions in my country, achieved a major technological breakthrough in splitting plant raw materials into millimeter-grade unbleached pulp with uniform specifications by alkali method, providing a technical and industrial foundation for biomass r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27N3/00B27N3/08B27N1/00B27N1/02
CPCB27N3/002B27N3/08B27N1/00B27N1/02
Inventor 尹应武任毅华赵升云师雪琴蔡成伟尹政清黄仁兵张海双赵玉芬
Owner XIAMEN UNIV
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