CN1243069C - Additive of applying condensed tannin extracts as adhesive for thermosetting wood - Google Patents
Additive of applying condensed tannin extracts as adhesive for thermosetting wood Download PDFInfo
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- CN1243069C CN1243069C CN 01130562 CN01130562A CN1243069C CN 1243069 C CN1243069 C CN 1243069C CN 01130562 CN01130562 CN 01130562 CN 01130562 A CN01130562 A CN 01130562A CN 1243069 C CN1243069 C CN 1243069C
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- China
- Prior art keywords
- extract
- adhesive
- tannin
- glue
- additive
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 239000000284 extract Substances 0.000 title claims abstract description 65
- 239000000853 adhesive Substances 0.000 title claims abstract description 39
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 39
- 239000002023 wood Substances 0.000 title claims abstract description 33
- 239000000654 additive Substances 0.000 title claims abstract description 21
- 230000000996 additive effect Effects 0.000 title claims abstract description 19
- 229920001187 thermosetting polymer Polymers 0.000 title claims abstract description 16
- 229920002770 condensed tannin Polymers 0.000 title abstract description 13
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000003292 glue Substances 0.000 claims abstract description 53
- 229920001864 tannin Polymers 0.000 claims abstract description 44
- 235000018553 tannin Nutrition 0.000 claims abstract description 44
- 239000001648 tannin Substances 0.000 claims abstract description 44
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 241000218652 Larix Species 0.000 claims abstract description 25
- 235000005590 Larix decidua Nutrition 0.000 claims abstract description 25
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229920001807 Urea-formaldehyde Polymers 0.000 claims abstract description 16
- 235000013824 polyphenols Nutrition 0.000 claims abstract description 15
- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 241000219433 Myrica Species 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 9
- 238000004026 adhesive bonding Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 235000015110 jellies Nutrition 0.000 claims 1
- 239000008274 jelly Substances 0.000 claims 1
- 235000007270 Gaultheria hispida Nutrition 0.000 abstract 2
- 235000009134 Myrica cerifera Nutrition 0.000 abstract 2
- 235000012851 Myrica pensylvanica Nutrition 0.000 abstract 2
- 239000004971 Cross linker Substances 0.000 abstract 1
- 244000024215 Myrica gale Species 0.000 abstract 1
- 244000269152 Myrica pensylvanica Species 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000003786 synthesis reaction Methods 0.000 abstract 1
- 235000019256 formaldehyde Nutrition 0.000 description 24
- 241000218653 Larix laricina Species 0.000 description 11
- 235000008119 Larix laricina Nutrition 0.000 description 11
- 244000132436 Myrica rubra Species 0.000 description 8
- 238000007731 hot pressing Methods 0.000 description 8
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 6
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000003431 cross linking reagent Substances 0.000 description 2
- VEVZSMAEJFVWIL-UHFFFAOYSA-O cyanidin cation Chemical compound [O+]=1C2=CC(O)=CC(O)=C2C=C(O)C=1C1=CC=C(O)C(O)=C1 VEVZSMAEJFVWIL-UHFFFAOYSA-O 0.000 description 2
- RCHKEJKUUXXBSM-UHFFFAOYSA-N n-benzyl-2-(3-formylindol-1-yl)acetamide Chemical compound C12=CC=CC=C2C(C=O)=CN1CC(=O)NCC1=CC=CC=C1 RCHKEJKUUXXBSM-UHFFFAOYSA-N 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 239000011120 plywood Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 235000018185 Betula X alpestris Nutrition 0.000 description 1
- 235000018212 Betula X uliginosa Nutrition 0.000 description 1
- GCPYCNBGGPHOBD-UHFFFAOYSA-N Delphinidin Natural products OC1=Cc2c(O)cc(O)cc2OC1=C3C=C(O)C(=O)C(=C3)O GCPYCNBGGPHOBD-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 235000007336 cyanidin Nutrition 0.000 description 1
- 235000007242 delphinidin Nutrition 0.000 description 1
- JKHRCGUTYDNCLE-UHFFFAOYSA-O delphinidin Chemical compound [O+]=1C2=CC(O)=CC(O)=C2C=C(O)C=1C1=CC(O)=C(O)C(O)=C1 JKHRCGUTYDNCLE-UHFFFAOYSA-O 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920006335 epoxy glue Polymers 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The present invention relates to an additive applying condensed tannin extracts as an adhesive for thermosetting wood. The condensed tannin extract of larch, or waxberries, etc. is mainly used as a crosslinker of thermosetting phenolic glue, urea-formaldehyde glue, larch tannin adhesive and waxberry tannin adhesive and also used as a capturing agent of free formaldehyde. After the synthesis of the adhesive is completed, the condensed tannin extract is added in the adhesive in the cooling process or before the glue is spread. The addition of the condensed tannin extract is 1 to 20 wt% of the adhesive. The condensed tannin extract has the functions of crosslink of the adhesive and free formaldehyde capturing in the adhesive cooling process and the artificial board production process. Consequently, the present invention reduces the formaldehyde emission in the artificial board and improves the mechanical properties of the artificial board. The tannin extracts are additives used for producing the additive of the adhesive of the thermosetting wood of artificial boards.
Description
The present invention relates to glue crosslinking agent and trapping agent in the additive agent field of wood adhesive, because its effect of unique chemical character of condensed tannin extracts can be simultaneously as the glue crosslinking agent of the adhesive for thermosetting wood that contains formaldehyde and the trapping agent of free formaldehyde, it is the unexistent effects of other additives, is suitable for producing the wood adhesive of making plate greatly.
Present adhesive for thermosetting wood product mainly is divided into two big classes: a class is a phenolic glue, and this class glue water resistance is good, cohesive force is strong, ageing-resistant, and the phenolic glue free formaldehyde content of producing with traditional glue method is higher.Because the phenol market price is higher, therefore the producer that produces phenolic glue in order to reduce cost, often strengthens the mol ratio of phenol and formaldehyde, just adds formaldehyde, certainly will cause the free formaldehyde content of phenolic glue higher like this.And another kind of be urea-formaldehyde glue, the free formaldehyde content of using the urea-formaldehyde glue that traditional glue method makes is also than higher.Now in order to reduce the free formaldehyde content of urea-formaldehyde glue, some manufacturer, take to reduce the mol ratio (1: 1-1: 0.9) of urea element and formaldehyde, so, though free formaldehyde content has fallen, but its quality has also fallen, and therefore needs to add the more expensive additive of multiple pricing to guarantee the quality of wood-based plate.
The phenolic glue at present in all parts of the country and the free formaldehyde content majority of urea-formaldehyde glue are at 0.5-3%, and be that have even higher, therefore more than the burst size of methanal of the wood-based plate of producing with these two kinds of tackiness agent at 20-100mg/100g (perforation method), be much higher than European standard E
1(≤10mg/100g), this will pollute the environment, and seriously influence the healthy of people.And condensed tannin extractss such as tamarack, red bayberry is cheap, can reduce the production cost of wood-based plate, and has unique chemical character, not only can catch free formaldehyde, and tackiness agent also played crosslinked effect, the burst size of methanal of wood-based plate will be reduced like this, and the physical and mechanical property of wood-based plate can be improved, can reduce the glued board burst size of methanal, reach European standard E
1(≤10mg/100g), the burst size of methanal≤20mg/100g of shaving board, medium-density plate, and can improve bonding strength 10%.
The purpose of this invention is to provide a kind of wood-based plate physical and mechanical property that can improve and to reduce burst size of methanal again, and raw material is easy to get, pure natural, play the glue connection and the trapping agent of two kinds of effects nontoxic the time, it uses technology simple, cheap, be fit to the production of extensive tackiness agent of industry and wood-based plate.
The present invention finds through investigation, tannin extract such as tamarack, red bayberry belongs to condensed tannin extracts, all be to utilize the bark of tamarack, red bayberry through soaking dike, evaporation, drying, and the powder-like product that makes, this product contains the tannin more than 55%, this tannin mainly is: larch tannin belong to the former cyanidin of poly " the vegatable tannin chemistry, Sun Dawang writes, the PP130-210 of China Forest press (1992); 374-375; 423-425 ".Baybery tannin belongs to the former delphinidin " PP166-169 of poly; 377-378; 423-425 ".
The wood adhesive that the inventor finds to use condensed tannin extractss such as tamarack, red bayberry to be used for heat curing-type after deliberation, contain formaldehyde can play the crosslinked of tackiness agent and catch the effect of free formaldehyde, this is the product of a kind of pure natural, nontoxic, cheap, the uniqueness that is easy to get, can stick with glue the additive of agent fully, be applied in the production of tackiness agent and wood-based plate.Processing condition such as used applying glue, hot pressing and phenolic glue and urea-formaldehyde glue are identical, and wood-based plate quality after testing meets national standard, and burst size of methanal reaches European standard E
1(10mg/100g).
The present invention has been finished in this research, thereby the present invention proposes with condensed tannin extractss such as tamarack, red bayberries as the adhesive for thermosetting wood additive that contains formaldehyde (linking agent, trapping agent).It is characterized in that it is used by following prescription:
(1) wood adhesive and additive formulations
Phenolic glue: larch extract or myrica extract=1: 0.01-0.2 (weight ratio)
Urea-formaldehyde glue: larch extract or myrica extract=1: 0.01-0.2 (weight ratio)
Larch tannin adhesive: larch extract or myrica extract=1: 0.05-0.2 (weight ratio)
Baybery tannin adhesive: larch extract or myrica extract=1: 0.05-0.2 (weight ratio)
In above-mentioned prescription, the tannin content of larch extract should not be lower than 55%, is preferably tannin content 〉=58%.The tannin content of myrica extract is not less than 55%, is preferably tannin content 〉=66%.
(2) operation steps
With tamarack, any tannin extract in the condensed tannin extractss such as red bayberry, how many decisions that contain free formaldehyde by adhesive for thermosetting wood add an amount of (1-20%) a kind of tannin extract, can be in the production process of tackiness agent, finish in this tackiness agent reaction, when viscosity reaches requirement, and begin the cooling or in temperature-fall period, under temperature 30-90 ℃, add a kind of tannin extract in proportion, through stirring, be cooled to 30 ℃ to transfer glue, stored for future use, this method can make free formaldehyde and tannin extract generation condensation reaction in the tackiness agent in temperature-fall period, thereby reduced the free formaldehyde content in the tackiness agent, remaining non-reacted parts tannin extract can react in hot pressing of artificial board, thereby greatly reduces the burst size of methanal of wood-based plate.In addition, add an amount of (1-20%) a kind of tannin extract equally in proportion before tackiness agent gluing or glue mixing, through stirring, depositing after 30 minutes can gluing or glue mixing in Wood-based Panel Production, takes place crosslinked and catches the effect of free formaldehyde through hot pressing.For the cost that do not increase tackiness agent or reduce its cost, (tannin extract: water=1: 1 or 1: 0.9), work can not influence its effect like this can to add an amount of water when adding tannin extract.
In addition, the present invention also provide tannin extracts such as tamarack, red bayberry as the additive of wood adhesive in the application of making aspects such as wood-based plate, its glue applying method, heat pressing process condition are identical with phenolic glue and urea-formaldehyde resin adhesive.
Enumerate example below with further explanation the present invention.
Embodiment 1
1, prescription
Composition weight (kg)
(1) phenolic glue 100
Larch extract 15
Water 15
(2) phenolic glue 100
Myrica extract 10
Water 10
(3) urea-formaldehyde glue 100
Larch extract 5
Water 5
(4) urea-formaldehyde glue 100
Myrica extract 3
Water 3
(5) larch tannin adhesive 100
Tamarack or myrica extract 8
Water 8
(6) Baybery tannin adhesive 100
Tamarack or myrica extract 5
Water 5
2, operation steps
(1) in the phenolic glue production process, when its viscosity reaches requirement and begins cooling or in temperature-fall period (90-30 ℃), tannin extract and water are joined in the phenolic glue in the reactor in proportion, stir, when treating that it is cooled to below 30 ℃, put glue, stored for future use.
(2) phenolic glue joins tannin extract and water in the tackiness agent before using its gluing or glue mixing in proportion, stirs, and deposits after 30 minutes and can use.
(3) urea-formaldehyde glue in process of production, after its viscosity reaches requirement, be cooled to during 70-50 ℃ or the vacuum hydro-extraction tamarack or myrica extract and water joined in the reactor in proportion and mix with tackiness agent, be cooled to below 30 ℃, put glue, storage, stand-by, can not add water if produce dehydrated glue, take off the water with the tannin extract equivalent weight less, its dry matter content is constant.
(4) urea-formaldehyde glue
Urea-formaldehyde glue adds an amount of tannin extract and water in proportion before using its gluing or glue mixing, stir, and places and can use after 30 minutes.
(5) larch tannin adhesive and Baybery tannin adhesive
Larch extract or myrica extract and water joined in proportion dissolved in the good larch tannin adhesive or Baybery tannin adhesive,, place and to use in 30 minutes through stirring.
Enumerate application examples below and explain practical application effect of the present invention.
Application examples 1
(1) epoxy glue (can add other additive simultaneously, as flour etc.) of the Phenol aldehyde resin that makes with embodiment 1 is used to produce five layers of Larch Plywood.Its processing condition: veneer thickness 1.3-1.4mm, veneer water ratio: Amount of spread 8%: 300g/m
2(two-sided), assembly time: 1 hour, hot pressing pressure: 1.2MPa/cm
2, hot pressing temperature: 130-140 ℃, hot pressing time: 7 minutes.Glued board gummed intensity: 1.8MPa, the wood-breaking rate that dispatches from the factory of producing: 80%, burst size of methanal: 5mg/100g (perforation method) meets the requirement of national standard to I class glued board fully, and burst size of methanal is lower than European standard E
1
(2) mixed glue of the urea-formaldehyde resin adhesive that makes with embodiment 1 adds 2% solidifying agent hydrogenation ammonium, stirs, and is used to produce 5 layers of birch plywood, its processing condition: veneer thickness 1.3-1.4mm, and water ratio: 7%, Amount of spread: 280g/m
2(two-sided), assembly time 1 hour, hot pressing pressure: 1.0MPa, temperature 100-115 ℃, hot pressing time: 7 minutes, unload and display 24 hours saw frontier inspections behind the plate and survey.The bonding strength of the glued board of being produced: 1.7MPa, wood-breaking rate 70%, burst size of methanal: 4mg/100g meet the requirement of GB to II class glued board quality fully, and burst size of methanal is lower than European standard E
1
It is above-mentioned that to have enumerated the present invention be Phenol aldehyde resin with tannin extracts such as condensing class such as tamarack, red bayberries, the preferred embodiment of urea-formaldehyde resin adhesive and application examples, yet these embodiment and application examples can not be as the restrictions to invention, in this bright spirit and claim institute restricted portion, still can make many variation schemes, and these all schemes all should be considered to belong to scope of the present invention.
Claims (3)
1, larch extract, myrica extract is characterized in that purposes, addition and the addition means of additive as the purposes that contains the additive of free formaldehyde adhesive for thermosetting wood:
(1) additive
The larch extract of tannin content 〉=55%
The myrica extract of tannin content 〉=55%
(2) addition
The 1%-20% that presses adhesive for thermosetting wood weight adds;
(3) addition means
With larch extract, any tannin extract in the myrica extract is pressed what and different types of wood adhesive of free formaldehyde content in the thermosetting wood jelly, decision is pressed tackiness agent weight and is added 1%-20% larch extract or myrica extract, in the production process of adhesive for thermosetting wood, after this tackiness agent building-up reactions is finished, and begin cooling or falling the temperature back under temperature 30-90 ℃, 1%-20% ratio in tackiness agent weight adds tannin extract, through stirring, be cooled to 30 ℃ and emit tackiness agent, stored for future use, the tannin extract that perhaps before adhesive applications, adds 1%-20% in same ratio, through stirring, can in building board production process, be used for glue mixing or gluing after 30 minutes, for the cost that do not increase tackiness agent or reduce cost, add an amount of water when adding tannin extract, its additional proportion: tannin extract: water=1: 1 or 1: 0.9 can not influence its effect like this.
2, larch extract as claimed in claim 1 or myrica extract be as containing the purposes of the additive of free formaldehyde adhesive for thermosetting wood, and wherein the larch extract of (1) additive, myrica extract are as the additive of the phenolic glue in the adhesive for thermosetting wood, urea-formaldehyde glue, larch tannin glue, Baybery tannin glue.
3, larch extract as claimed in claim 1 or myrica extract are as the purposes that contains the additive of free formaldehyde adhesive for thermosetting wood, and wherein (3) addition means is used two kinds of methods addings:
When its viscosity reached requirement after (1) reaction was finished in the tackiness agent production process, and begin cooling or after cooling finishes, put the preceding adding of glue, stir, be cooled to 30 ℃ and put glue, stand-by;
(2) larch extract and myrica extract additive add before glue mixing or gluing and stir, and deposit after 30 minutes and use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01130562 CN1243069C (en) | 2001-12-02 | 2001-12-02 | Additive of applying condensed tannin extracts as adhesive for thermosetting wood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01130562 CN1243069C (en) | 2001-12-02 | 2001-12-02 | Additive of applying condensed tannin extracts as adhesive for thermosetting wood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1422928A CN1422928A (en) | 2003-06-11 |
| CN1243069C true CN1243069C (en) | 2006-02-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01130562 Expired - Fee Related CN1243069C (en) | 2001-12-02 | 2001-12-02 | Additive of applying condensed tannin extracts as adhesive for thermosetting wood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1243069C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019180235A1 (en) * | 2018-03-23 | 2019-09-26 | Foresa, Industrias Quimicas Del Noroeste, S.A.U. | Monocomponent adhesive composition comprising formaldehyde-based resin with a free formal-dehyde content below 0,1 wt%, comprising resorcinol, alkylresorcinol and/or tannin |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106317134B (en) * | 2016-08-22 | 2018-09-14 | 西北农林科技大学 | A kind of method that hydro-thermal method hydrolysis tannin extract prepares glucose and gallic acid |
| CN107841268B (en) * | 2017-11-28 | 2020-06-09 | 南京林业大学 | Preparation method of grape skin tannin modified phenolic resin adhesive |
| CN107987766B (en) * | 2017-12-14 | 2020-09-11 | 南京林业大学 | A kind of method utilizing formaldehyde slag to prepare biomass adhesive |
-
2001
- 2001-12-02 CN CN 01130562 patent/CN1243069C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019180235A1 (en) * | 2018-03-23 | 2019-09-26 | Foresa, Industrias Quimicas Del Noroeste, S.A.U. | Monocomponent adhesive composition comprising formaldehyde-based resin with a free formal-dehyde content below 0,1 wt%, comprising resorcinol, alkylresorcinol and/or tannin |
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| Publication number | Publication date |
|---|---|
| CN1422928A (en) | 2003-06-11 |
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