Search

CN-122008632-A - Multi-layer-structure herb fiber environment-friendly plate and preparation method thereof

CN122008632ACN 122008632 ACN122008632 ACN 122008632ACN-122008632-A

Abstract

The invention discloses an environment-friendly herbal fiber board with a multilayer structure and a preparation method thereof, and relates to the technical field of environment-friendly composite materials, wherein the environment-friendly composite material comprises an upper layer panel, a middle functional sandwich layer and a lower layer bottom plate, the upper layer panel and the lower layer bottom plate are both made of bark fibers serving as frameworks, mugwort straw powder and medicinal plant straw powder serving as main fillers, the upper layer panel and the lower layer bottom plate are bonded through environment-friendly adhesives and then subjected to hot press molding, the middle functional sandwich layer comprises Ai Zha-wt%, 10 wt% of hedera helix powder, 11-wt% of peach branch and calamus leaf mixed powder, 8-wt% of eucalyptus bark powder and paper bark powder, 6-wt% of bamboo powder and fiber cloth embedded in the middle functional sandwich layer, the environment-friendly adhesives are selected from polymeric MDI glue or biomass-based glue, the total dry material mass of the upper layer panel, the lower layer bottom plate and the middle functional sandwich layer is 8-12% of the total thickness of the upper layer panel and the lower layer bottom plate accounts for 65% of the whole thickness, the middle functional sandwich layer accounts for 35% of the whole thickness of the board, and the length of the bark fibers is 15-mm.

Inventors

  • LU JIN
  • LU MINGZHI

Assignees

  • 蕲春天康蕲艾产业有限公司

Dates

Publication Date
20260512
Application Date
20260316

Claims (10)

  1. 1. The utility model provides a multilayer structure herb fiber environmental protection panel which characterized in that includes: an upper panel, a middle functional sandwich layer and a lower bottom plate; the upper layer panel and the lower layer bottom plate are both made of bark fiber as a framework, and the wormwood straw powder and the medicinal plant straw powder are used as main fillers and bonded by an environment-friendly adhesive and then formed by hot pressing; The middle functional sandwich layer comprises Ai Zha to wt percent, 10 to wt percent of hedera helix powder, 11 to wt percent of mixed powder of peach branches and calamus leaves, 8 to wt percent of eucalyptus bark powder and 6 to wt percent of bamboo powder and fiber cloth embedded in the mixed powder; the environment-friendly adhesive is selected from polymeric MDI adhesive or biomass-based adhesive, and the dosage of the environment-friendly adhesive is 8-12% of the total dry material mass in the upper panel, the lower bottom plate and the middle functional sandwich layer.
  2. 2. The multi-layer structured herbal fiber environment-friendly board material as claimed in claim 1, wherein the total thickness of the upper layer panel and the lower layer bottom plate is 65% of the whole thickness of the board material, and the thickness of the middle functional sandwich layer is 35% of the whole thickness of the board material; The length of the bark fiber is 15-20 mm, and the water content is 8% -12%; The grain sizes of Ai Zha, the medicinal plant stalk powder and the bamboo powder are respectively 40 meshes, 80 meshes and 100 meshes; the plate also contains a coupling agent, a flame retardant and a waterproof agent, and the addition amounts of the coupling agent, the flame retardant and the waterproof agent respectively account for 1 percent, 0.3 percent and 2 percent of the total dry material mass.
  3. 3. The method for preparing the multi-layer structure herb fiber environment-friendly board as claimed in claim 2, wherein the medicinal plant stalk powder is at least two selected from Ai Caogan powder, calamus stalk powder, peach branch powder and hedera helix stalk powder.
  4. 4. The method for preparing the multi-layer-structure herb fiber environment-friendly plate as claimed in claim 3, wherein the fiber cloth is natural plant fiber non-woven fabric, the surface density is 80-120 g/m 2 , and the fiber cloth is embedded in the middle of the middle functional sandwich layer.
  5. 5. A method for preparing the multi-layer herb fiber environment-friendly board, which is characterized by comprising the steps of: S1, steaming and softening bark fibers, soaking the bark fibers in a plant ash water or gypsum water solution, pulping the bark fibers until the fiber length is 15-20 mm, and regulating the water content to 8-12% to obtain skeleton fibers; S2, respectively drying and crushing mugwort straw, medicinal plant stems, ai Zha, hedera helix, peach branches, calamus leaves, eucalyptus and leatheroid tree bark and bamboo, and sieving to obtain powder of 40 meshes, 80 meshes or 100 meshes; s3, uniformly mixing the powder, the coupling agent, the flame retardant, the waterproof agent and the environment-friendly adhesive according to the proportion, and respectively preparing an upper-layer plate material, a middle-function sandwich layer material and a lower-layer base plate material; S4, paving a lower-layer base plate, a middle functional sandwich layer material (embedded fiber cloth) and an upper-layer plate in the die in sequence to form a three-layer blank; S5, placing the green body in a hot press, hot-pressing for 10-20 minutes at the temperature of 140-160 ℃ and the pressure of 3-5 MPa, cooling and demoulding to obtain the multi-layer-structure herb fiber environment-friendly plate.
  6. 6. The method for preparing a multi-layer-structure herbal fiber environmental-friendly board according to claim 5, wherein in the step S1, the mass concentration of the herbal ash aqueous solution is 3% -5%, the soaking time is 2-4 hours, the concentration of the gypsum aqueous solution is 2% -4%, and the soaking time is 1-3 hours.
  7. 7. The method for preparing a multi-layer structured herbal fiber environment-friendly board as claimed in claim 6, wherein in the step S3, when the environment-friendly adhesive is polymeric MDI glue, the mixing temperature is controlled to be 25-35 ℃, when the environment-friendly adhesive is biomass-based glue, the mixing temperature is controlled to be 40-50 ℃, and 0.5% -1% of curing accelerator is added.
  8. 8. The method of claim 7, wherein in the step S4, the fiber cloth is a natural plant fiber non-woven fabric with an areal density of 80-120 g/m 2 , is laid in the middle of the middle functional sandwich layer material, and has a width smaller than the board width of 5-10 mm to avoid edge overflow.
  9. 9. The method for preparing the multi-layer-structure herb fiber environment-friendly plate as claimed in claim 8, wherein in the step S5, a sectional pressurizing mode is adopted in the hot pressing process, namely, 1-2 MPa is adopted for prepressing for 2-3 minutes for exhausting, then the pressure is increased to 3-5 MPa for maintaining the pressure for 8-15 minutes, and finally the pressure is reduced for cooling to below 50 ℃ for demoulding.
  10. 10. The method for preparing the multi-layer structured herbal fiber environment-friendly board as claimed in claim 9, wherein in the step S2, the crushed powder is dried for 2-4 hours at 60-80 ℃ before being mixed, so that the water content is less than or equal to 5%.

Description

Multi-layer-structure herb fiber environment-friendly plate and preparation method thereof Technical Field The invention relates to the technical field of environment-friendly composite materials, in particular to a herb fiber environment-friendly plate with a multilayer structure and a preparation method thereof. Background The technical field of environment-friendly composite materials refers to a novel material technical system which is compounded by a physical, chemical or biological method based on renewable resources, waste or low-environmental-load raw materials and has excellent performance and environment-friendly characteristics. The field focuses on reducing the dependence on petrochemical resources, reducing the energy consumption and emission in the production process, improving the degradability or the circulability of materials, and ensuring that the product is harmless to human health and ecological environment in the whole life cycle. Typical materials include natural fiber reinforced composites, bio-based resin based composites, recycled plastic/rubber composites, functional boards prepared by utilizing agricultural, forestry or industrial solid wastes, and the like, and are widely applied to the fields of construction, transportation, packaging, home furnishing, electronics, and the like. The fiberboard prepared from single agricultural waste generally has the problems of low internal bonding strength, poor static bending strength, high thickness expansion rate after water absorption and the like, limits the application of the fiberboard in a high-humidity or load-bearing environment, and the medicinal plants such as wormwood, calamus, peach branches, hedera helix and the like generate a large amount of residues after traditional Chinese medicine extraction or garden pruning, and are generally burnt or buried, so that resource waste and environmental pollution are caused, and a high-value utilization path is lacked. Disclosure of Invention The present invention has been made in view of the above-described problems occurring in the prior art. Therefore, the invention provides the multi-layer-structure herb fiber environment-friendly board which solves the problems that the fiberboard prepared from single agricultural waste is low in internal bonding strength, poor in static bending strength, high in thickness expansion rate after water absorption and the like, limits the application of the fiberboard in a high-humidity or bearing environment, and the problems that a large amount of residues are generated after the extraction of traditional Chinese medicines or the pruning of gardens of medicinal plants such as wormwood, calamus, peach branches and hedera helix are usually burnt or buried, so that the resource waste and the environmental pollution are caused and a high-value utilization path is lacking. In order to solve the technical problems, the invention provides the following technical scheme: in a first aspect, the present invention provides a multi-layer structured herbal fiber environment-friendly board material, comprising: an upper panel, a middle functional sandwich layer and a lower bottom plate; the upper layer panel and the lower layer bottom plate are both made of bark fiber as a framework, and the wormwood straw powder and the medicinal plant straw powder are used as main fillers and bonded by an environment-friendly adhesive and then formed by hot pressing; The middle functional sandwich layer comprises Ai Zha to wt percent, 10 to wt percent of hedera helix powder, 11 to wt percent of mixed powder of peach branches and calamus leaves, 8 to wt percent of eucalyptus bark powder and 6 to wt percent of bamboo powder and fiber cloth embedded in the mixed powder; the environment-friendly adhesive is selected from polymeric MDI adhesive or biomass-based adhesive, and the dosage of the environment-friendly adhesive is 8-12% of the total dry material mass in the upper panel, the lower bottom plate and the middle functional sandwich layer. As a preferable scheme of the multi-layer-structure herbal fiber environment-friendly board, the total thickness of the upper layer panel and the lower layer bottom plate accounts for 65% of the whole thickness of the board, and the thickness of the middle functional sandwich layer accounts for 35% of the whole thickness of the board; The length of the bark fiber is 15-20 mm, and the water content is 8% -12%; The grain sizes of Ai Zha, the medicinal plant stalk powder and the bamboo powder are respectively 40 meshes, 80 meshes and 100 meshes; the plate also contains a coupling agent, a flame retardant and a waterproof agent, and the addition amounts of the coupling agent, the flame retardant and the waterproof agent respectively account for 1 percent, 0.3 percent and 2 percent of the total dry material mass. As a preferable scheme of the multi-layer-structure herb fiber environment-friendly plate, the medicinal plant stalk powder is at least two se