CN105150345A - Novel acid-alkali-corrosion-resistant high-density composite fiberboard and preparation method thereof - Google Patents
Novel acid-alkali-corrosion-resistant high-density composite fiberboard and preparation method thereof Download PDFInfo
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- CN105150345A CN105150345A CN201510414376.1A CN201510414376A CN105150345A CN 105150345 A CN105150345 A CN 105150345A CN 201510414376 A CN201510414376 A CN 201510414376A CN 105150345 A CN105150345 A CN 105150345A
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Abstract
The invention discloses a novel acid-alkali-corrosion-resistant high-density composite fiberboard. The fiberboard is characterized by being prepared from the raw materials including, by weight, 42-45 parts of crop straw, an appropriate amount of sodium hydroxide with the concentration of 2%, 2-2.5 parts of silane coupling agents kh450, 66-70 parts of ethanol with the concentration of 95%, 30-32 parts of wood scraps, 7-8 parts of teflon superfine powder, 5-6 parts of waterborne polyurethane adhesive, 1.5-2 parts of emulsifying paraffin, an appropriate amount of water and 2-3 parts of melamine resin. According to the fiberboard and a preparation method thereof, fibers are treated through the teflon superfine powder, so that the lubricity is improved, and the fibers are prevented from being difficult to demould after hot pressing; meanwhile, the melamine resin and the waterborne polyurethane adhesive are adopted and mixed to serve as adhesive for the product; the waterproof and damp-proof effects are outstanding, and the adhesive has a very good acid-alkali-isolation function, so that the high-density fiberboard is prevented from being corroded by acid and alkali in the using process; the service life of the product is prolonged, and the quality of a project is also improved.
Description
Technical field
The present invention relates to the novel high-density composite fiber plate in wood materials deep process technology field, particularly a kind of acid-alkali-corrosive-resisting and preparation method thereof.
Background technology
In recent years, the development of China middle and higher density fiberboard industry is very fast, hardboard originally progressively replace by medium and high density fibre panel.MDF enterprise is very large to the dependence of wood raw material, and wood raw material cost accounts for about 45% of production cost, the wood raw material production having badly influenced fiberboard in short supply.With regard to the requirement that medium and high density fibre panel is produced, be more than 10 years, the regeneration period of bamboo is also at 3-5, and the regeneration period of agricultural crop straw is 1 year or less than 1 year, from the utilization ratio of resource, the stalk of crops was the most favourable.China is large agricultural country, have abundant agricultural straw resource, but at present the utilization rate of China's stalk resource is only 33%, all the other most of stalks are fallen as castoff burning or only as fuel, not only cause the waste of natural resources, and weighting ring environment pollution.Adopt the cheap agronomic crop fibre strong with recyclability to replace wood raw material, become a direction of middle and higher density fiberboard development gradually.But the herbaceous plant fiber taking crops as representative is then short and thin, limits the mechanical strength of turf fibre plate to a certain extent.The content of herbaceous plant stem stalk organic solvent extract is obviously lower than wood raw material, but main component is wax, accompany by a small amount of higher fatty acids, higher alcohol etc., add that grass cane, epidermal leaf cells silicidize degree are very high, wax coat and the dioxide-containing silica on stalk surface are high, be unfavorable for the infiltration of adhesive, result in the gummed of traditional Lauxite to crushed straw aggregate bad.When this just requires to utilize the herbaceous plant fibers such as agricultural crop straw to manufacture high density fiberboard, the traditional adhesive existed in existing technique must be solved and glue together bad, poor water resistance, intensity difference defect.
Phenolic resins, Lauxite are the Typical Representatives of formaldehyde series glue, use the most distinct issues of glutol to be free formaldehyde release.Glutol series wood-based plate constantly can discharge free formaldehyde, serious harm health in 3-15 before production and products thereof uses.Both at home and abroad the demand of the wood-based panel products such as no-formaldehyde density board is grown to even greater heights.Find in production practices, Aqueous Polyurethane Adhesives etc. do not arise at the historic moment containing the adhesive of formaldehyde, and occupation rate of market is more and more higher, but because price is higher, utilize it will inevitably bring the increase of the production cost of density fiber board as adhesive, but a part of composition can be saved under the prerequisite adopting the raw material such as agricultural crop straw, wood leftover material, so both can not cause the increase of cost, also the product of safety and environmental protection in producing, is worth commercially promoting.
Along with the development of high density fiberboard, be only the demand that intensity, resistance to water have not reached market development far away, this just requires the sheet material constantly developing various performance, to meet the demand in market.
Summary of the invention
Novel high-density composite fiber plate that the object of this invention is to provide a kind of acid-alkali-corrosive-resisting and preparation method thereof.Melmac is mixed the adhesive as product by the present invention with Aqueous Polyurethane Adhesives, there is well isolated soda acid function, make high density fiberboard be can not corrode by soda acid in use procedure, improve the service life of high density fiberboard, also improve the quality of engineering.
In order to realize object of the present invention, the present invention is by following scheme implementation:
A novel high-density composite fiber plate for acid-alkali-corrosive-resisting, is made up of the raw material of following weight portion: ethanol 66-70, wood leftover material 30-32 that the Sodium hydroxide q. s that agricultural crop straw 42-45, concentration are 2%, silane coupler kh4502-2.5, concentration are 95%, superfine powder of polytetrafluoroethylene 7-8, Aqueous Polyurethane Adhesives 5-6, emulsified wax 1.5-2, water are appropriate, melmac 2-3;
The novel high-density composite fiber plate of a kind of acid-alkali-corrosive-resisting of the present invention, be made up of following concrete steps:
(1) putting into baking oven after being cleaned by agricultural crop straw, to be dried to water content be 20%-30%, cold go after be cut into the segment of 3-4 centimetre, then the concentration adding 3 times amount is the NaOH of 2%, filter after stirring 2-3 hour with the speed of 60 revs/min, get filter residue and be washed to neutrality, obtain crop branch fiber;
(2) wood leftover material is sent in wood chipper be cut into irregular spile, under 155-165 DEG C of condition, with saturated vapor (pressure is 0.75MPa), boiling is carried out to wood chip, send in defibrator after wood chip is softening, at the same temperature, under the mixing speed effect of 1200-1400 rev/min, wear into wood-fibred, the crop branch fiber obtained with step (1) is mixed to get composite fibre;
(3) superfine powder of polytetrafluoroethylene is mixed with silane coupler kh450, finally two kinds of mixture ball millings being added concentration after 40 minutes is make suspension in the ethanol of 95%, at room temperature stir 30 minutes, then composite fibre is soaked wherein, pull out after 20-30 minute, put in an oven after drying, dry 30 minutes under the condition of 85-95 DEG C, take out the composite fibre obtaining surface modification after it cools naturally;
(4) first melmac is mixed with Aqueous Polyurethane Adhesives, then add emulsified wax, make mixed slurry after stirring under normal temperature stand-by; The composite fibre of surface modification step (3) obtained adds the mixed slurry of half amount after mixing agitator is by fabric thrashing, stir, then the material after mixing thoroughly is sent in spray mixer, continue to spray into second half mixed slurry, obtain the composite fibre before hot pressing;
(5) composite fibre before hot pressing is mated formation equably in the slab meeting technological requirement, control the thickness of fiberboard, first precompressed on vulcanizing press, then through continuous rolling precompressed, obtain preformed slab, again preformed slab is sent into hot press and carry out that hot-forming (control hot pressing temperature is 180-210 DEG C, and briquetting pressure is 40kg/cm
2, the dwell time is 3-4 minute) namely obtain product of the present invention.
The invention has the beneficial effects as follows: the present invention carries out modification on the basis of traditional handicraft, first soaking with sodium hydroxide agricultural crop straw is utilized, the wax coat on stalk top layer can be reduced, make the stalk fibre that content of ashes is low, with superfine powder of polytetrafluoroethylene and silane coupler is composite processes after again stalk fibre being mixed with wood-fibred, amalgamation, uniformity, the lubricity of further raising composite fibre, fiber after such process and Aqueous Polyurethane Adhesives etc. can be combined closely, not easily layering, steady quality is homogeneous, and intensity is high.
The present invention adopts superfine powder of polytetrafluoroethylene to carry out the process of fiber, improve lubricity, prevent the not easily demoulding after hot pressing, employing melmac mixes the adhesive as product with Aqueous Polyurethane Adhesives simultaneously, a part is blended with composite fibre, a part is sprayed on composite fibre surface, such treatment process can make process slurry well penetrate between fiber and fiber, waterproof moisture-proof effect is remarkable, there is well isolated soda acid function, high density fiberboard is made to be can not corrode by soda acid in use procedure, improve the service life of product, also improve the quality of engineering.
Specific embodiments
Below by instantiation, the present invention is described in detail.
A novel high-density composite fiber plate for acid-alkali-corrosive-resisting, is made up of the raw material of following weight portion (kilogram): the ethanol 66 that the Sodium hydroxide q. s that agricultural crop straw 42, concentration are 2%, silane coupler kh4502, concentration are 95%, wood leftover material 30, superfine powder of polytetrafluoroethylene 7, Aqueous Polyurethane Adhesives 5, emulsified wax 1.5, water are appropriate, melmac 2;
The novel high-density composite fiber plate of a kind of acid-alkali-corrosive-resisting of the present invention, be made up of following concrete steps:
(1) putting into baking oven after being cleaned by agricultural crop straw, to be dried to water content be 20%-30%, cold go after be cut into the segment of 3-4 centimetre, then the concentration adding 3 times amount is the NaOH of 2%, filter after stirring 2 hours with the speed of 60 revs/min, get filter residue and be washed to neutrality, obtain crop branch fiber;
(2) wood leftover material is sent in wood chipper be cut into irregular spile, under 155-165 DEG C of condition, with saturated vapor (pressure is 0.75MPa), boiling is carried out to wood chip, send in defibrator after wood chip is softening, at the same temperature, under the mixing speed effect of 1200 revs/min, wear into wood-fibred, the crop branch fiber obtained with step (1) is mixed to get composite fibre;
(3) superfine powder of polytetrafluoroethylene is mixed with silane coupler kh450, finally two kinds of mixture ball millings being added concentration after 40 minutes is make suspension in the ethanol of 95%, at room temperature stir 30 minutes, then composite fibre is soaked wherein, pull out after 20 minutes, put in an oven after drying, dry 30 minutes under the condition of 85-95 DEG C, take out the composite fibre obtaining surface modification after it cools naturally;
(4) first melmac is mixed with Aqueous Polyurethane Adhesives, then add emulsified wax, make mixed slurry after stirring under normal temperature stand-by; The composite fibre of surface modification step (3) obtained adds the mixed slurry of half amount after mixing agitator is by fabric thrashing, stir, then the material after mixing thoroughly is sent in spray mixer, continue to spray into second half mixed slurry, obtain the composite fibre before hot pressing;
(5) composite fibre before hot pressing is mated formation equably in the slab meeting technological requirement, control the thickness of fiberboard, first precompressed on vulcanizing press, then through continuous rolling precompressed, obtain preformed slab, again preformed slab is sent into hot press and carry out that hot-forming (control hot pressing temperature is 180-210 DEG C, and briquetting pressure is 40kg/cm
2, the dwell time is 3 minutes) namely obtain product of the present invention.
Thickness of the present invention is 12mm, the product after hot pressing cools at normal temperatures, saw and cut, deposit 2 days after, after testing, the performance test results of product of the present invention meets: density is 0.85g/cm
3, MOR is 36.82MPa, and internal bond strength is 0.868MPa, and elastic modelling quantity is 3198MPa, and thickness swelling rate is 10%, and burst size of methanal reaches E0 level environmental protection standard.
Claims (2)
1. the novel high-density composite fiber plate of an acid-alkali-corrosive-resisting, it is characterized in that, be made up of the raw material of following weight portion: ethanol 66-70, wood leftover material 30-32 that the Sodium hydroxide q. s that agricultural crop straw 42-45, concentration are 2%, silane coupler kh4502-2.5, concentration are 95%, superfine powder of polytetrafluoroethylene 7-8, Aqueous Polyurethane Adhesives 5-6, emulsified wax 1.5-2, water are appropriate, melmac 2-3.
2. the novel high-density composite fiber plate of a kind of acid-alkali-corrosive-resisting according to claim 1, is characterized in that, be made up of following concrete steps:
(1) putting into baking oven after being cleaned by agricultural crop straw, to be dried to water content be 20%-30%, cold go after be cut into the segment of 3-4 centimetre, then the concentration adding 3 times amount is the NaOH of 2%, filter after stirring 2-3 hour with the speed of 60 revs/min, get filter residue and be washed to neutrality, obtain crop branch fiber;
(2) wood leftover material is sent in wood chipper be cut into irregular spile, under 155-165 DEG C of condition, with saturated vapor (pressure is 0.75MPa), boiling is carried out to wood chip, send in defibrator after wood chip is softening, at the same temperature, under the mixing speed effect of 1200-1400 rev/min, wear into wood-fibred, the crop branch fiber obtained with step (1) is mixed to get composite fibre;
(3) superfine powder of polytetrafluoroethylene is mixed with silane coupler kh450, finally two kinds of mixture ball millings being added concentration after 40 minutes is make suspension in the ethanol of 95%, at room temperature stir 30 minutes, then composite fibre is soaked wherein, pull out after 20-30 minute, put in an oven after drying, dry 30 minutes under the condition of 85-95 DEG C, take out the composite fibre obtaining surface modification after it cools naturally;
(4) first melmac is mixed with Aqueous Polyurethane Adhesives, then add emulsified wax, make mixed slurry after stirring under normal temperature stand-by; The composite fibre of surface modification step (3) obtained adds the mixed slurry of half amount after mixing agitator is by fabric thrashing, stir, then the material after mixing thoroughly is sent in spray mixer, continue to spray into second half mixed slurry, obtain the composite fibre before hot pressing;
(5) composite fibre before hot pressing is mated formation equably in the slab meeting technological requirement, control the thickness of fiberboard, first precompressed on vulcanizing press, then through continuous rolling precompressed, obtain preformed slab, again preformed slab is sent into hot press and carry out that hot-forming (control hot pressing temperature is 180-210 DEG C, and briquetting pressure is 40kg/cm
2, the dwell time is 3-4 minute) namely obtain product of the present invention.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109736523A (en) * | 2019-01-21 | 2019-05-10 | 桐城市桐佳装饰有限公司 | A kind of dalle of Dampproof |
| CN111923191A (en) * | 2020-08-04 | 2020-11-13 | 申蕾 | High-density composite fiber board |
| CN112936465A (en) * | 2021-01-26 | 2021-06-11 | 千年舟新材科技集团股份有限公司 | Super-flat building template capable of being recycled for multiple times and preparation method |
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| CN101225285A (en) * | 2007-12-26 | 2008-07-23 | 广西丰林木业集团股份有限公司 | Method for producing highly effective aldehyde catching glue |
| CN103753687A (en) * | 2013-12-31 | 2014-04-30 | 广西丰林木业集团股份有限公司 | Manufacturing method of light inflaming retarding fiberboard |
| CN104479385A (en) * | 2014-11-18 | 2015-04-01 | 江苏大学 | Preparation method of reinforced straw fiber composite material |
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2015
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| WO2007123298A1 (en) * | 2006-04-25 | 2007-11-01 | Lg Chem, Ltd. | Flooring having transfer-printed hdf and process for manufacturing the same |
| CN101225285A (en) * | 2007-12-26 | 2008-07-23 | 广西丰林木业集团股份有限公司 | Method for producing highly effective aldehyde catching glue |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109736523A (en) * | 2019-01-21 | 2019-05-10 | 桐城市桐佳装饰有限公司 | A kind of dalle of Dampproof |
| CN111923191A (en) * | 2020-08-04 | 2020-11-13 | 申蕾 | High-density composite fiber board |
| CN112936465A (en) * | 2021-01-26 | 2021-06-11 | 千年舟新材科技集团股份有限公司 | Super-flat building template capable of being recycled for multiple times and preparation method |
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Application publication date: 20151216 |