CN105082309A - High-cost-performance and high-density fiberboard where paint can be directly sprayed and preparation method of high-cost-performance and high-density fiberboard - Google Patents
High-cost-performance and high-density fiberboard where paint can be directly sprayed and preparation method of high-cost-performance and high-density fiberboard Download PDFInfo
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- CN105082309A CN105082309A CN201510414358.3A CN201510414358A CN105082309A CN 105082309 A CN105082309 A CN 105082309A CN 201510414358 A CN201510414358 A CN 201510414358A CN 105082309 A CN105082309 A CN 105082309A
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Abstract
The invention discloses a high-cost-performance and high-density fiberboard where paint can be directly sprayed. The high-cost-performance and high-density fiberboard where paint can be directly sprayed is characterized by being prepared from, by weight, 42-45 parts of crop straw, 30-32 parts of wood scraps, an appropriate amount of sodium hydroxide with the concentration being 2%, 2-2.5 parts of a silane coupling agents kh450, 66-70 parts of ethyl alcohol with the concentration being 95%, 7-8 parts of waterborne polyurethane adhesives, 1.5-2 parts of emulsion paraffin, an appropriate amount of water, 2-3 parts of urea, 3-5 parts of talcum powder, 1-2 parts of silicon oil and 0.5-0.7 part of silicone emulsion. According to the high-cost-performance and high-density fiberboard where paint can be directly sprayed, by adding the talcum powder, the fiberboard has certain lubricating performance, and demolding is easy after hot-pressing is performed on the board. The raw materials of the high-cost-performance and high-density fiberboard where paint can be directly sprayed are easy to obtain, the crop straw, the wood scraps and the like are prepared, and wood resources are saved; through technology modification, the manufactured product is fine and compact in structure, paint can be directly sprayed, the adhesive force of the paint is good, the paint is not prone to cracking, and the fiberboard is durable in use.
Description
Technical field
The present invention relates to wood materials deep process technology field, particularly a kind of can the high performance-price ratio high density fiberboard and preparation method thereof of direct spraying coating.
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.
It is formaldehyde series glue three kinds of Typical Representatives that phenolic resins, Lauxite and melamine resin adehsive stick agent, uses the most distinct issues of three-aldehyde glue to be free formaldehyde release.Three-aldehyde glue 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
The object of this invention is to provide a kind of can the high performance-price ratio high density fiberboard and preparation method thereof of direct spraying coating.The product quality that the present invention makes is fine and smooth, and the adhesive force for coating is good, not easy to crack, durable in use.
In order to realize object of the present invention, the present invention is by following scheme implementation:
Can the high performance-price ratio high density fiberboard of direct spraying coating, be made up of the raw material of following weight portion: ethanol 66-70, cellulose acetate 2-3 that the Sodium hydroxide q. s that agricultural crop straw 42-45, wood leftover material 30-32, concentration are 2%, silane coupler kh4502-2.5, concentration are 95%, Aqueous Polyurethane Adhesives 7-8, emulsified wax 1.5-2, water are appropriate, urea 2-3, talcum powder 3-5, silicone oil 1-2, silicone emulsion 0.5-0.7;
Of the present invention a kind of can the high performance-price ratio high density fiberboard of direct spraying coating, 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) by Urea to melting, add cellulose acetate, talcum powder, put into kneader and mediate 20 minutes, then add silane coupler kh450, put into ball mill ball milling 30 minutes, then being distributed to concentration is in the ethanol of 95%, stirs and forms suspension, then composite fibre continued to be immersed in suspension under normal temperature, pull out after 20-30 minute, put in an oven after drying, then dry under the condition of 85-95 DEG C, take out the composite fibre obtaining surface modification after it cools naturally;
(4) first by emulsified wax, silicone oil, silicone emulsion mixing and stirring, then add all the other residual components, make mixed slurry after stirring 20-30 minute with the speed of 200 revs/min 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 feeding hot press is carried out hot-forming (control hot pressing temperature is 180-210 DEG C, and briquetting pressure is 40kg/cm2, and the dwell time is 3-4 minute) and namely obtain product of the present invention.
The invention has the beneficial effects as follows: first the present invention utilizes soaking with sodium hydroxide agricultural crop straw, the wax coat on stalk top layer can be reduced, make the stalk fibre that content of ashes is low, again stalk fibre is mixed rear talcum powder, urea etc. and silane coupler process with wood-fibred, viscosity, the amalgamation of further raising composite fibre, the fiber like this after process and Aqueous Polyurethane Adhesives, silicone emulsion etc. can be combined closely, not easily layering, steady quality is homogeneous, and intensity is high.
The present invention adds talcum powder, have certain lubricity, make the sheet material easily demoulding after hot-pressing, raw material of the present invention is simple and easy to get, adopt the preparation such as agricultural crop straw, wood leftover material, saved timber resources, by the modification of technique, the product tissue made is fine and smooth fine and close, can direct spraying coating, the adhesive force of coating is good, not easy to crack, durable in use.
Specific embodiments
Below by instantiation, the present invention is described in detail.
Can the high performance-price ratio high density fiberboard of direct spraying coating, be 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, wood leftover material 30, concentration are 2%, silane coupler kh4502, concentration are 95%, cellulose acetate 2, Aqueous Polyurethane Adhesives 7, emulsified wax 1.5, water are appropriate, urea 2, talcum powder 3, silicone oil 1, silicone emulsion 0.5;
Of the present invention a kind of can the high performance-price ratio high density fiberboard of direct spraying coating, 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) by Urea to melting, add cellulose acetate, talcum powder, put into kneader and mediate 20 minutes, then add silane coupler kh450, put into ball mill ball milling 30 minutes, then being distributed to concentration is in the ethanol of 95%, stirs and forms suspension, then composite fibre continued to be immersed in suspension under normal temperature, pull out after 20 minutes, put in an oven after drying, then dry under the condition of 85-95 DEG C, take out the composite fibre obtaining surface modification after it cools naturally;
(4) first by emulsified wax, silicone oil, silicone emulsion mixing and stirring, then add all the other residual components, make mixed slurry after stirring 20 minutes with the speed of 200 revs/min 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 feeding hot press is carried out hot-forming (control hot pressing temperature is 180-210 DEG C, and briquetting pressure is 40kg/cm2, and the dwell time is 3 minutes) and 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 0.854g/cm
3, MOR is 37.23MPa, and internal bond strength is 0.855MPa, and elastic modelling quantity is 3298MPa, and thickness swelling rate is 11.39%, and burst size of methanal reaches E0 level environmental protection standard.
Claims (2)
1. one kind can the high performance-price ratio high density fiberboard of direct spraying coating, it is characterized in that, be made up of the raw material of following weight portion: ethanol 66-70, cellulose acetate 2-3 that the Sodium hydroxide q. s that agricultural crop straw 42-45, wood leftover material 30-32, concentration are 2%, silane coupler kh4502-2.5, concentration are 95%, Aqueous Polyurethane Adhesives 7-8, emulsified wax 1.5-2, water are appropriate, urea 2-3, talcum powder 3-5, silicone oil 1-2, silicone emulsion 0.5-0.7.
2. a kind of according to claim 1 can the high performance-price ratio high density fiberboard of direct spraying coating, it 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) by Urea to melting, add cellulose acetate, talcum powder, put into kneader and mediate 20 minutes, then add silane coupler kh450, put into ball mill ball milling 30 minutes, then being distributed to concentration is in the ethanol of 95%, stirs and forms suspension, then composite fibre continued to be immersed in suspension under normal temperature, pull out after 20-30 minute, put in an oven after drying, then dry under the condition of 85-95 DEG C, take out the composite fibre obtaining surface modification after it cools naturally;
(4) first by emulsified wax, silicone oil, silicone emulsion mixing and stirring, then add all the other residual components, make mixed slurry after stirring 20-30 minute with the speed of 200 revs/min 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 feeding hot press is carried out hot-forming (control hot pressing temperature is 180-210 DEG C, and briquetting pressure is 40kg/cm2, and the dwell time is 3-4 minute) and namely obtain product of the present invention.
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| CN201510414358.3A CN105082309A (en) | 2015-07-15 | 2015-07-15 | High-cost-performance and high-density fiberboard where paint can be directly sprayed and preparation method of high-cost-performance and high-density fiberboard |
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| CN201510414358.3A CN105082309A (en) | 2015-07-15 | 2015-07-15 | High-cost-performance and high-density fiberboard where paint can be directly sprayed and preparation method of high-cost-performance and high-density fiberboard |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105885193A (en) * | 2016-05-30 | 2016-08-24 | 蚌埠市维光塑胶制品有限公司 | Plastic bag prepared from modified sorghum straw |
| 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 |
Citations (6)
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| JPH06262727A (en) * | 1993-03-12 | 1994-09-20 | Dainippon Printing Co Ltd | Plywood substituting panel and preparation thereof |
| CN1850474A (en) * | 2006-05-16 | 2006-10-25 | 安徽科技开发公司 | Technical method for preparing special active plasticized granule for wood-plastic composite material utilizing agricultural stalk |
| EP2111959A2 (en) * | 2008-04-24 | 2009-10-28 | Kronotec Ag | Method for producing wooden materials and wooden materials |
| CN103709773A (en) * | 2013-12-12 | 2014-04-09 | 湖北工业大学 | Alkaline thiourea disentangled straw/resin composite board making method |
| CN103938470A (en) * | 2014-04-04 | 2014-07-23 | 朱益锋 | Digital printing color fixing agent for woolen sweater |
| 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
- 2015-07-15 CN CN201510414358.3A patent/CN105082309A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06262727A (en) * | 1993-03-12 | 1994-09-20 | Dainippon Printing Co Ltd | Plywood substituting panel and preparation thereof |
| CN1850474A (en) * | 2006-05-16 | 2006-10-25 | 安徽科技开发公司 | Technical method for preparing special active plasticized granule for wood-plastic composite material utilizing agricultural stalk |
| EP2111959A2 (en) * | 2008-04-24 | 2009-10-28 | Kronotec Ag | Method for producing wooden materials and wooden materials |
| CN103709773A (en) * | 2013-12-12 | 2014-04-09 | 湖北工业大学 | Alkaline thiourea disentangled straw/resin composite board making method |
| CN103938470A (en) * | 2014-04-04 | 2014-07-23 | 朱益锋 | Digital printing color fixing agent for woolen sweater |
| CN104479385A (en) * | 2014-11-18 | 2015-04-01 | 江苏大学 | Preparation method of reinforced straw fiber composite material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105885193A (en) * | 2016-05-30 | 2016-08-24 | 蚌埠市维光塑胶制品有限公司 | Plastic bag prepared from modified sorghum straw |
| 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: 20151125 |