CN110900779A - Zero-formaldehyde environment-friendly straw board and preparation method thereof - Google Patents
Zero-formaldehyde environment-friendly straw board and preparation method thereof Download PDFInfo
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- CN110900779A CN110900779A CN201811085488.7A CN201811085488A CN110900779A CN 110900779 A CN110900779 A CN 110900779A CN 201811085488 A CN201811085488 A CN 201811085488A CN 110900779 A CN110900779 A CN 110900779A
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- straw
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/12—Moulding of mats from fibres
Abstract
The invention discloses a preparation method of a zero-formaldehyde environment-friendly straw board. The plastic particles with thermoplasticity (becoming soft when heated and becoming hard after cooling) are used as the binder, and the straw particles are bonded together under the conditions of heating and pressurizing, so that the harm of free formaldehyde in the traditional straw board to the environment and human body is effectively solved. Compared with the traditional wood board, the straw board produced by the invention has the characteristics of equivalent bonding strength, static bending strength, screw holding force and the like, and has wide market prospect. The wood plastic can widely replace artificial plywood, fiberboard, shaving board and natural wood, is applied to furniture, floors, doors and windows, outdoors and other fields, not only relieves the contradiction between wood supply and demand and the problem of environmental pollution caused by burning of waste straws, but also reduces the environmental pollution caused by waste 1-day plastic.
Description
The technical field is as follows:
the invention belongs to the technical field of artificial boards, and particularly relates to a preparation method of a zero-formaldehyde environment-friendly straw board.
Background art:
the wood plays a very important role in the development history of human beings, is widely applied to the fields of building industry, house decoration, furniture manufacture, paper making industry and the like, and compared with three novel materials, namely steel, cement and plastics, the wood has the characteristics of beautiful stripes, natural fragrance and convenient processing, so that the wood can better meet the pursuit of people for good life, but the current situation of wood resource shortage is worried by people more and more. China is a big country for agricultural production, the variety of crops is extremely rich, and the development and utilization of crop straws as raw materials for producing the board can not only relieve the contradiction between supply and demand of wood and protect forest resources, but also drive the economic development of rural areas, improve the income of farmers and realize the vogue of rural areas.
At present, a great deal of research work is done at home and abroad on the characteristics of agricultural product wastes such as wheat straws, rice straws, cotton straws and the like, the process conditions for manufacturing straw boards and the economic feasibility analysis of production. In the production of boards, the selection of adhesives is very critical, urea-formaldehyde glue and phenolic glue are widely applied in the production of traditional straw boards, for example, Chinese patent (application number: 201410799748.2) proposes a production method of wheat and rice straw boards, rice and wheat straw are crushed and then treated with a silane coupling agent, urea-formaldehyde resin glue is added to be uniformly mixed in a multifunctional mixer, and the mixture is subjected to hot press molding to obtain a household board. As a high polymer material, the plastic has the characteristics of thermoplasticity (softening when heated and hardening after cooling), can be repeatedly softened and hardened, and is used for straw board production by means of the characteristics of the plastic at present, so that a lot of reports are available. For example, Chinese patent (application No. 200810020342.4) uses thermoplastic plastics as matrix, uses wheat straw fiber as reinforcing agent, improves the compatibility of the wheat straw fiber and the matrix by modifying the surface of the wheat straw fiber, and then manufactures the wheat straw fiber/thermoplastic plastic composite material by processing technologies such as blending, granulating, compression molding and the like. However, the amount of plastics in the straw board produced by the patent is too high, the production cost is high, and the large-scale use of renewable material straws is not facilitated.
The invention content is as follows:
the invention aims to overcome the defects of the prior art, and the technical problem to be solved is to provide a binder which is low in cost, simple, convenient and easy to operate, is beneficial to improving the strength performance of a plate, does not release formaldehyde, is used for preparing a high-strength zero-formaldehyde environment-friendly straw board, and has excellent comprehensive properties such as bending strength and internal bonding strength.
1. The invention provides a method for preparing a high-strength zero-formaldehyde environment-friendly straw board.
The formaldehyde-free environment-friendly straw board is processed by straw particles and regenerated plastic particles,
wherein the straw is one or more of wheat straw, rice straw, corn straw, potato straw, cotton straw, bagasse and other crop wastes rich in plant fiber; the water content of the straws is less than 10 percent, and the straws are crushed into straw particles of 1-5 cm by a crusher;
wherein the plastic is one or more of recyclable waste plastics such as nylon, polyethylene, polypropylene, polyester and the like, and is crushed into 25-35-mesh regenerated plastic particles by a crusher.
The crushing of the straw particles and the recycled plastic particles must be controlled to a certain size, the gaps among the particles are increased due to the overlarge particle size of the particles, and the strength of the prepared environment-friendly straw board cannot meet the requirement; the environment-friendly straw board produced by undersize particle size is easy to be weathered into powder, and the service life of the straw board is influenced.
2. The method comprises the following steps: the method for preparing the environment-friendly straw board by utilizing the straw particles and the regenerated plastic particles is simple and convenient, and comprises the following three steps:
(1) washing away mud and dust on the surfaces of the straws by using tap water, drying the straws to be less than 8% by using a dryer, and crushing the straws into particles with a certain size by using a crusher; washing the waste plastics to remove silt, drying and crushing the waste plastics into particles with a certain size by using a crusher;
(2) putting the straw particles and the regenerated plastic particles into a mixing roll for mixing, wherein the mixing temperature is lower than the melting point of the regenerated plastic particles for uniform mixing, and the preferable temperature is 50-90 ℃;
(3) performing drying and pressing molding through a temperature-controllable continuous drying and pressing machine, performing hot pressing and then cold pressing, wherein the hot pressing temperature is preferably 140-; the method is characterized in that the interval time between the hot pressing and the cold pressing is preferably within 30 min. .
3. The invention provides a preparation method of a zero-formaldehyde environment-friendly straw board.
The zero-formaldehyde environment-friendly straw board comprises straw particles and regenerated plastic particles, wherein the straw particles are base materials of the zero-formaldehyde environment-friendly straw board, the thermoplastic regenerated plastic particles are used as binders, the regenerated plastic particles are melted under high temperature and pressure, the straw particles are firmly bonded together after cooling, and the strength of the straw board brick is improved;
the mass fraction of the regenerated plastic particles in the zero-formaldehyde environment-friendly straw board is less than or equal to 20%;
the mass fraction of the regenerated plastic particles in the zero-formaldehyde environment-friendly straw board is preferably 5-15%;
when the die is formed, the using temperature is 140-3The straw board.
By testing the physical and mechanical properties of the zero-formaldehyde environment-friendly straw board, the board has the tensile strength of 36.35MPa, the internal bonding strength of 1.33MPa and the screw holding force of 1427.56N, which are all superior to the use standards specified in GB/T17657-2013 physicochemical property test method for artificial boards and veneered artificial boards.
The zero-formaldehyde environment-friendly straw board can widely replace artificial plywood, fiberboard, shaving board and natural wood, and is applied to furniture, floors, doors and windows, outdoor and other fields.
In conclusion, the invention provides a preparation method of a zero-formaldehyde environment-friendly straw board, which has the following beneficial effects:
A. the base material of the environment-friendly straw board is straw particles, the thermoplastic regenerated plastic particles are used as a binder, the blended regenerated plastic particles are uniformly distributed around the straw particles, the regenerated plastic particles are melted at high temperature, and the straw particles are firmly bonded together by utilizing the characteristics of a high polymer material after cooling, so that the strength of the environment-friendly straw board is improved;
B. in the process of crushing the straws and the waste plastics, the size of the particles is strictly controlled, so that the strength of the straw board is prevented from being reduced due to the overlarge particles, and the phenomenon of efflorescence and powder discharge due to the overlarge particles is also avoided;
C. the method effectively solves the problem of recycling agricultural waste straws and waste plastics, has simple and convenient production process, does not cause pollution to the environment in the processing process, avoids using adhesives such as urea-formaldehyde glue, phenol-formaldehyde glue and the like in the production process of the straw board, does not contain formaldehyde, has the characteristic of environmental protection, and is suitable for large-scale production and processing.
The specific implementation mode is as follows:
the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1.
Firstly, washing away mud and dust on the surfaces of straws by using tap water, drying the straws to be less than 8% by using a dryer, and crushing the straws into straw particles of 1-5 cm by using a crusher; washing the waste plastics to remove silt, drying, and crushing into 25-35 mesh regenerated plastic particles with the water content lower than 5% by a crusher;
step two, weighing 100 kg of straw particles and 10 kg of regenerated plastic particles, adding the straw particles and the regenerated plastic particles into a mixing roll for blending, and setting the temperature to be 70 ℃ to preliminarily soften the regenerated plastic particles;
step three, the mixture in the step two is dried and formed through a temperature-controllable continuous drying and pressing machine, hot pressing and cold pressing are carried out firstly, the hot pressing temperature is preferably 140-; and cooling at room temperature, and solidifying to finally obtain the high-strength environment-friendly straw board.
Example 2.
Firstly, washing away mud and dust on the surfaces of straws by using tap water, drying the straws to be less than 8% by using a dryer, and crushing the straws into straw particles of 1-5 cm by using a crusher; washing the waste plastics to remove silt, drying, and crushing into 25-35 mesh regenerated plastic particles with the water content lower than 5% by a crusher;
step two, weighing 100 kg of straw particles and 15 kg of regenerated plastic particles, adding the straw particles and the regenerated plastic particles into a mixing roll for blending, and setting the temperature to be 70 ℃ to preliminarily soften the regenerated plastic particles;
step three, the mixture in the step two is dried and formed through a temperature-controllable continuous drying and pressing machine, hot pressing and cold pressing are carried out firstly, the hot pressing temperature is preferably 140-; and cooling at room temperature, and solidifying to finally obtain the high-strength environment-friendly straw board.
Example 3.
Firstly, washing away mud and dust on the surfaces of straws by using tap water, drying the straws to be less than 8% by using a dryer, and crushing the straws into straw particles of 1-5 cm by using a crusher; washing the waste plastics to remove silt, drying, and crushing into 25-35 mesh regenerated plastic particles with the water content lower than 5% by a crusher;
step two, weighing 100 kg of straw particles and 10 kg of regenerated plastic particles, adding the straw particles and the regenerated plastic particles into a mixing roll for blending, and setting the temperature to be 50 ℃ to preliminarily soften the regenerated plastic particles;
step three, the mixture in the step two is dried and formed through a temperature-controllable continuous drying and pressing machine, hot pressing and cold pressing are carried out firstly, the hot pressing temperature is preferably 140-; and cooling at room temperature, and solidifying to finally obtain the high-strength environment-friendly straw board.
Example 4.
Firstly, washing away mud and dust on the surfaces of straws by using tap water, drying the straws to be less than 8% by using a dryer, and crushing the straws into straw particles of 1-5 cm by using a crusher; washing the waste plastics to remove silt, drying, and crushing into 25-35 mesh regenerated plastic particles with the water content lower than 5% by a crusher;
step two, weighing 100 kg of straw particles and 15 kg of regenerated plastic particles, adding the straw particles and the regenerated plastic particles into a mixing roll for blending, and setting the temperature to be 50 ℃ to preliminarily soften the regenerated plastic particles;
step three, the mixture in the step two is dried and formed through a temperature-controllable continuous drying and pressing machine, hot pressing and cold pressing are carried out firstly, the hot pressing temperature is preferably 140-; and cooling at room temperature, and solidifying to finally obtain the high-strength environment-friendly straw board.
Claims (10)
1. A zero-formaldehyde environment-friendly straw board is characterized by comprising the following components: straw particles and regenerated plastic particles.
2. The zero-formaldehyde environment-friendly straw board as claimed in claim 1, wherein the straw is one or more of straw waste such as wheat straw, rice straw, corn straw, potato straw, cotton straw, bagasse and the like which are rich in plant fiber; the water content of the straws is less than 8 percent, and the straws are crushed into straw particles of 1-5 cm by a crusher.
3. The zero-formaldehyde environment-friendly straw board as claimed in claim 1, wherein the recycled plastic particles are one or a combination of recyclable nylon, polyethylene, polypropylene and polyester, and are crushed into 25-35 mesh recycled plastic particles by a crusher.
4. The zero-formaldehyde environment-friendly straw board as claimed in claim 1, wherein the mass fraction of the recycled plastic particles is less than or equal to 20%.
5. The zero-formaldehyde environment-friendly straw board as claimed in claim 1, wherein the straw particles are firmly bonded together under heating conditions by utilizing the thermoplasticity of the recycled plastic particles, and can replace the traditional phenolic aldehyde and urea formaldehyde resin, thereby solving the problem of environmental pollution caused by waste plastics.
6. The zero-formaldehyde environment-friendly straw board as claimed in claim 1, wherein in order to obtain the high-strength straw board, the straw particles and the recycled plastic particles are crushed into a certain particle size.
7. The zero-formaldehyde environment-friendly straw board as claimed in claim 1, is characterized in that agricultural waste straws and waste plastics are used as raw materials, so that resources are saved, and the board has the characteristics of environmental protection.
8. The zero-formaldehyde environment-friendly straw board as claimed in claim 1, wherein the board prepared by the board has excellent physical properties (internal bonding strength, static bending strength, board surface screw holding force and the like) and can be compared favorably with the performance of a wooden board prepared by traditional urea-formaldehyde glue and phenolic glue.
9. The zero-formaldehyde environment-friendly straw board as claimed in claim 1, wherein the production process comprises the following steps:
(1) washing away mud and dust on the surfaces of the straws by using tap water, drying the straws to be less than 8% by using a dryer, and crushing the straws into particles with a certain size by using a crusher; washing the waste plastics to remove silt, drying and crushing the waste plastics into particles with a certain size by using a crusher; (ii) a
(2) Putting the straw particles and the regenerated plastic particles into a mixing roll for mixing, wherein the mixing temperature is lower than the melting point of the regenerated plastic particles for uniform mixing, and the preferable temperature is 50-90 ℃;
(3) performing drying and pressing molding through a temperature-controllable continuous drying and pressing machine, performing hot pressing and then cold pressing, wherein the hot pressing temperature is preferably 140-; the method is characterized in that the interval time between the hot pressing and the cold pressing is preferably within 30 min.
10. The zero-formaldehyde environment-friendly straw board as claimed in claim 1 can be widely used for replacing artificial plywood, fiberboard, flakeboard and natural wood, and can be applied to furniture, floors, doors and windows, outdoor and other fields.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811085488.7A CN110900779A (en) | 2018-09-18 | 2018-09-18 | Zero-formaldehyde environment-friendly straw board and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811085488.7A CN110900779A (en) | 2018-09-18 | 2018-09-18 | Zero-formaldehyde environment-friendly straw board and preparation method thereof |
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| CN110900779A true CN110900779A (en) | 2020-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811085488.7A Pending CN110900779A (en) | 2018-09-18 | 2018-09-18 | Zero-formaldehyde environment-friendly straw board and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112300592A (en) * | 2020-10-30 | 2021-02-02 | 喀什茂隆生态科技有限公司 | Zero-formaldehyde high-strength cotton straw artificial board |
| CN114654844A (en) * | 2020-12-23 | 2022-06-24 | 湖南登科材料科技有限公司 | Device for manufacturing anti-scald pad by using straws and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1139610A (en) * | 1995-07-04 | 1997-01-08 | 毛文群 | Waste plastics composite plate and making method thereof |
| CN1255523A (en) * | 1998-12-03 | 2000-06-07 | 中国石化齐鲁石油化工公司 | Hot-fusible high-molecular adhesive and its preparing process |
| CN101138857A (en) * | 2007-10-23 | 2008-03-12 | 孔繁诚 | Wood plastic plank stuff production technology and equipment thereof |
| CN102485788A (en) * | 2010-12-01 | 2012-06-06 | 湖南忠悦塑业有限公司 | Crops waste material regenerated composite plastic plate and its production process |
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2018
- 2018-09-18 CN CN201811085488.7A patent/CN110900779A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1139610A (en) * | 1995-07-04 | 1997-01-08 | 毛文群 | Waste plastics composite plate and making method thereof |
| CN1255523A (en) * | 1998-12-03 | 2000-06-07 | 中国石化齐鲁石油化工公司 | Hot-fusible high-molecular adhesive and its preparing process |
| CN101138857A (en) * | 2007-10-23 | 2008-03-12 | 孔繁诚 | Wood plastic plank stuff production technology and equipment thereof |
| CN102485788A (en) * | 2010-12-01 | 2012-06-06 | 湖南忠悦塑业有限公司 | Crops waste material regenerated composite plastic plate and its production process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112300592A (en) * | 2020-10-30 | 2021-02-02 | 喀什茂隆生态科技有限公司 | Zero-formaldehyde high-strength cotton straw artificial board |
| CN114654844A (en) * | 2020-12-23 | 2022-06-24 | 湖南登科材料科技有限公司 | Device for manufacturing anti-scald pad by using straws and preparation method thereof |
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Address after: 276100 Xinyuan Road, Tancheng County Economic Development Zone, Linyi, Shandong Province, No. 7 Applicant after: Skorer new material technology (Shandong) Co., Ltd Address before: Four Beijing area 100078 Fengtai District fangqunyuan No. 22 building 1501 Applicant before: BEIJING SIKERUI NEW MATERIALS TECHNOLOGY Co.,Ltd. |
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Application publication date: 20200324 |