CN100588520C - Environment-friendly type middle and higher density Fibreboard Production technology - Google Patents

Environment-friendly type middle and higher density Fibreboard Production technology Download PDF

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Publication number
CN100588520C
CN100588520C CN200810016035A CN200810016035A CN100588520C CN 100588520 C CN100588520 C CN 100588520C CN 200810016035 A CN200810016035 A CN 200810016035A CN 200810016035 A CN200810016035 A CN 200810016035A CN 100588520 C CN100588520 C CN 100588520C
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China
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hot pressing
urea
glue
fiber
production technology
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CN200810016035A
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Chinese (zh)
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CN101269509A (en
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刘保卫
李�杰
刘冬
李林
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东营正和木业有限公司
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Abstract

The present invention relates to the environment-friendly type middle and higher density Fibreboard Production technology in the Wood-based Panel Production technology field.Comprise: operations such as wood chip screening and cleaning, boiling, defibrator process, glue compounding and applying, drying, the moulding of mating formation, hot pressing and cooling.In the glue compounding and applying process, add modified urea-formaldehyde resin adhesive, curing agent and buffer and mix glue; Fiber moisture is not more than 13% after drying; The fiber that mixes behind the glue carried out hot pressing process within 20 minutes, hot pressing temperature 180-220 ℃, the hot pressing factor is to carry out hot pressing under the hot pressing condition of 8-10s/mm, and density is controlled at 820-850g/cm 3The present invention has adopted the modified adhesive of low mol ratio, has guaranteed the even running of glue manufacturing process, has reduced the burst size of methanal in the sheet material, has increased the toughness and the mechanical strength of sheet material.

Description

Environment-friendly type middle and higher density Fibreboard Production technology

Technical field

The invention belongs to Wood-based Panel Production technology field, the environment-friendly type middle and higher density Fibreboard Production technology that particularly a kind of low formaldehyde discharges.

Background technology

The production technology of middle and higher density fiberboard mainly comprises operations such as former wooden shavings (or outsourcing wood chip), wood chip screening and cleaning, boiling, defibrator process, glue compounding and applying, drying, precompressed, hot pressing, sanction saw, cooling at present.Wherein use the higher ordinary resin class adhesive of content of formaldehyde in the glue compounding and applying operation.Along with the raising of living standards of the people and the fast development of wood-processing industry, people are for the understanding of environmental protection notion also gradually raising, yet for our living environment, formaldehyde is the difficult problem of people's headache always, and it is endangering the healthy of people.In China, the artificial sheet material of the employed major part of house decoration (as glued board, lumber core, MDF, decorative panel, consolidated floor and compoiste wood floor etc.) formaldehyde discharges higher, it is very long that formaldehyde discharges period simultaneously, formaldehyde release period in the sheet material is up to 15 years, this brings serious harm to health, the principal element of indoor pollution is exactly a formaldehyde, studies show that: concentration of formaldehyde reaches 0.06~0.07mg/m in air 3The time, slight asthma can take place in children.When formaldehyde in indoor air content is 0.1mg/m 3The time, peculiar smell and sense of discomfort are just arranged.Reach 0.5mg/m 3The time, can stimulate eyes, cause and shed tears.Reach 0.6mg/m 3The time can cause throat discomfort or pain.When concentration is higher, the vomiting that can cause nausea, cough, uncomfortable in chest, asthma even pulmonary edema.Reach 30mg/m 3The time, but the causing death.In order to give one of people living environment preferably, development and production low toxic and environment-friendly type middle and higher density fibrous plate is a technical problem to be solved by this invention.

Summary of the invention

Environment-friendly type middle and higher density Fibreboard Production technology provided by the invention, be on the basis of existing production technology, by the modification processing of adhesive and adding method and heat pressing process are rationally adjusted, the middle and higher density fiberboard that reaches production satisfies the purpose of low formaldehyde emissions.

Technical scheme comprises: wood chip screening and cleaning, boiling, defibrator process, glue compounding and applying, drying, the moulding of mating formation, hot pressing and refrigerating work procedure.Wood chip makes fiber after through screening, cleaning, boiling and defibrator process, in the glue compounding and applying process, add modified urea-formaldehyde resin adhesive, curing agent and buffer and mix glue, wherein, the modified urea-formaldehyde resin adhesive addition accounts for the 10-13% of the weight ratio of bone dry fiber for solid adhesive weight, the curing agent addition is to account for 3.5% of solid adhesive weight, and the buffer addition accounts for 2% of solid adhesive weight; Fiber moisture is not more than 13% after drying; The fiber that mixes behind the glue carried out hot pressing process within 20 minutes, hot pressing temperature 180-220 ℃, the hot pressing factor is to carry out hot pressing under the hot pressing condition of 8-10s/mm, and density is controlled at 820-850g/cm 3

The preparation method of described modified urea-formaldehyde resin adhesive is: urea divides four addings in the modified urea-formaldehyde resin adhesive, and the mol ratio of formaldehyde and urea is followed successively by 4.0,2.2,1.15-1.30,0.7-0.9; At first adding concentration in reactor is the 36.5-37.5% industrial formol, adds urea for the first time, begins to stir, and melts the NaOH of back with 30-40%, and the adjusting pH value is 7.5-8.5; Be warming up to 75-85 ℃ of adding and account for total liquid weight, in the time of 85-95 ℃, add urea for the second time, reacted 20-35 minute than being the industrial melamine of 1-1.5%; Sampling is cooled to 25-35 ℃ of temperature conditions under survey liquid glue viscosity when being 20 seconds, is 5.5-6.5 with the formic acid adhesive transfer pH value of concentration 20%, adds urea for the third time; Take a sample equally and under 25-35 ℃ of temperature conditions, survey adhesiveness 40-50 during second, the 4th adding urea; Insulation is 10-30 minute when being cooled to 70-75 ℃, continues to be cooled to below 30 ℃, and regulating glue PH with NaOH is 7.8-8.5, and making solids content is the 56-60% modified urea-formaldehyde resin adhesive.

Described curing agent is the ammonium sulfate of concentration 20%, and described buffer is that concentration is the urea of 20-30%.

The present invention has adopted the modified adhesive of low mol ratio, has guaranteed the even running of glue manufacturing process, has reduced the burst size of methanal in the sheet material, owing to added melamine glue has been carried out modification, so increased the toughness and the mechanical strength of sheet material.The medium and high density fibre panel material of being produced, its burst size of methanal can reach European E0 grade standard and Japanese F4 grade standard, are a kind of novel low toxic and environment-friendly artificial boards, but the adaptation people's of better and safer home decoration; In addition, the sheet material mechanical strength that the method is made is higher, and the plate face has plate face processing characteristics preferably.

The specific embodiment

Enumerate below a kind of typical industrial production technology overall process, comprising: former wooden shavings (or the outsourcing wood chip) → screening → washing → pre-boiling → boiling → defibrator process → glue compounding and applying → drying → sorting → moulding of mating formation → spray film → precompressed → hot pressing → sanction saw → cooling → storage health → check → finished product.The present invention is on the basis of existing technological process, interpolation and heat pressing process to the Lauxite of modification partly improve: wood chip is through screening, washing, boiling, after the defibrator process, the resin added that accounts for bone dry fiber 10-13% with solid gum in the applying glue process mixes glue, and curing agent accounts for solid gum amount 3.5%, and adds the buffer that accounts for solid gum amount 2% and mix glue; Fiber after the applying glue must carry out heat pressing process within 20 minutes, and dry run guarantees that 13% fiber drying is moisture, and about 200 ℃ of hot pressing temperatures are carried out hot pressing under the hot pressing condition of hot pressing factor 8-10s/mm, and density is controlled at 820-850g/c m 3

The manufacture craft of low mol ratio modified urea-formaldehyde resin adhesive: urea divides four addings in the modified adhesive, and the mol ratio of formaldehyde and urea is followed successively by 4.0,2.2,1.15-1.30,0.7-0.9; Add the industrial formol (concentration 36.5-37.5%) that at first measures in reactor, add one time urea, begin to stir, melt the NaOH of back with 30-40%, the adjusting pH value is 7.5-8.5; Be warming up to 80 ℃ of industrial melamines that add total liquid glue 1-1.5%, add secondary urea in the time of 90 ℃, 90 ℃ were reacted about 30 minutes, and when survey liquid glue viscosity was 20 seconds in the time of 30 ℃, the formic acid adhesive transfer pH value with 20% was 5.5-6.5, adds three times urea; Same sampling is surveyed adhesiveness 40-50 during second at 30 ℃, add four times urea, cooling, insulation is 10-30 minute in the time of 75 ℃, continue to be cooled to below 30 ℃, regulating glue PH with an amount of NaOH is 7.8-8.5 blowing (annotate: the solids content of this kind glue is about 56-60% after finishing).

Claims (2)

1, in a kind of environment-friendly type, the high-density fiber board production technology, comprise: wood chip screening and cleaning, boiling, defibrator process, glue compounding and applying, dry, the moulding of mating formation, hot pressing and refrigerating work procedure, wood chip is in the process screening, clean, make fiber after boiling and the defibrator process, in the glue compounding and applying process, add modified urea-formaldehyde resin adhesive, curing agent and buffer mix glue, wherein, the modified urea-formaldehyde resin adhesive addition accounts for the 10-13% of the weight ratio of bone dry fiber for solid adhesive weight, the curing agent addition is to account for 3.5% of solid adhesive weight, and the buffer addition accounts for 2% of solid adhesive weight; Fiber moisture is not more than 13% after drying; The fiber that mixes behind the glue carried out hot pressing process within 20 minutes, hot pressing temperature 180-220 ℃, the hot pressing factor is to carry out hot pressing under the hot pressing condition of 8-10s/mm, and density is controlled at 820-850g/cm 3, it is characterized in that: the preparation method of described modified urea-formaldehyde resin adhesive is: urea divides four addings in the modified urea-formaldehyde resin adhesive, and the mol ratio of formaldehyde and urea is followed successively by 4.0,2.2,1.15-1.30,0.7-0.9; At first adding concentration in reactor is the 36.5-37.5% industrial formol, adds urea for the first time, begins to stir, and melts the NaOH of back with 30-40%, and the adjusting pH value is 7.5-8.5; Be warming up to 75-85 ℃ of adding and account for total liquid weight, in the time of 85-95 ℃, add urea for the second time, reacted 20-35 minute than being the industrial melamine of 1-1.5%; Sampling is cooled to 25-35 ℃ of temperature conditions under survey liquid glue viscosity when being 20 seconds, is 5.5-6.5 with the formic acid adhesive transfer pH value of concentration 20%, adds urea for the third time; Take a sample equally and under 25-35 ℃ of temperature conditions, survey adhesiveness 40-50 during second, the 4th adding urea; Insulation is 10-30 minute when being cooled to 70-75 ℃, continues to be cooled to below 30 ℃, and regulating glue PH with NaOH is 7.8-8.5, and making solids content is the 56-60% modified urea-formaldehyde resin adhesive.
2, environment-friendly type middle and higher density Fibreboard Production technology according to claim 1 is characterized in that described curing agent is the ammonium sulfate of concentration 20%, and the buffer of being gone back is that concentration is the urea of 20-30%.
CN200810016035A 2008-05-15 2008-05-15 Environment-friendly type middle and higher density Fibreboard Production technology CN100588520C (en)

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CN100588520C true CN100588520C (en) 2010-02-10

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CN101863066A (en) * 2009-10-16 2010-10-20 东营正和木业有限公司 Production process for flame-retardant medium and high-density board
CN102407553A (en) * 2010-09-21 2012-04-11 大亚科技股份有限公司 Manufacturing method of high density fiberboard for whitened type E1 grade floor substrate
CN102977302B (en) * 2011-09-05 2015-03-11 安徽华森木业有限公司 Preparation method of glue for sheet materials
CN103132397B (en) * 2011-11-24 2015-06-17 大亚人造板集团有限公司 Manufacturing method for washing machine cover plate purpose density fiberboards
CN102731019B (en) * 2012-07-06 2013-11-06 武汉工程大学 Method for preparing compound board substrate by using waste yam diosgenin fibers
CN103333633A (en) * 2013-07-04 2013-10-02 无锡木佳新材料科技有限公司 Curing agent of urea-formaldehyde resin adhesive applicable in dry process fiberboards and particleboards
CN103465336A (en) * 2013-10-09 2013-12-25 赤水市新生竹纤维板有限公司 Method for producing bamboo particle board by using bamboo shavings
CN103786232A (en) * 2014-01-21 2014-05-14 张志利 Method for producing artificial board through latent curing agent
CN104175383B (en) * 2014-07-23 2016-05-18 漳州中福木业有限公司 Treadmill plate and continous way flat-press process manufacturing technique method and application
CN104404837A (en) * 2014-10-08 2015-03-11 广东威华股份有限公司 Environment-friendly medium-high-density fibreboard and production method thereof
CN104875267B (en) * 2015-05-20 2017-05-10 福建省永安林业(集团)股份有限公司 Preparation method of medium-density fiber board for door plate of closet door
CN105171886B (en) * 2015-08-21 2017-07-28 广西星岛科技发展有限公司 A kind of production method of ultra micro residual formaldehyde amount fiberboard
CN106013721B (en) * 2016-05-26 2018-03-30 成都市美康三杉木业有限公司 Fiberboard removes aldehyde technique and its application in laminated flooring and thick china
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