CN113492447A - Poplar wood modifying liquid containing dialdehyde starch - Google Patents
Poplar wood modifying liquid containing dialdehyde starch Download PDFInfo
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- CN113492447A CN113492447A CN202010272004.0A CN202010272004A CN113492447A CN 113492447 A CN113492447 A CN 113492447A CN 202010272004 A CN202010272004 A CN 202010272004A CN 113492447 A CN113492447 A CN 113492447A
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- dialdehyde starch
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- 229920002085 Dialdehyde starch Polymers 0.000 title claims abstract description 44
- 239000002023 wood Substances 0.000 title claims abstract description 42
- 239000007788 liquid Substances 0.000 title claims abstract description 35
- 241000219000 Populus Species 0.000 title claims abstract description 32
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000004202 carbamide Substances 0.000 claims abstract description 36
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 11
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 11
- 239000004593 Epoxy Substances 0.000 claims abstract description 11
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 10
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims abstract description 10
- XESZUVZBAMCAEJ-UHFFFAOYSA-N 4-tert-butylcatechol Chemical compound CC(C)(C)C1=CC=C(O)C(O)=C1 XESZUVZBAMCAEJ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 9
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 9
- 229910021538 borax Inorganic materials 0.000 claims abstract description 9
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims abstract description 9
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000004328 sodium tetraborate Substances 0.000 claims abstract description 9
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 9
- 229920002261 Corn starch Polymers 0.000 claims abstract description 6
- 239000008120 corn starch Substances 0.000 claims abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- 238000003756 stirring Methods 0.000 claims description 30
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 27
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 238000012986 modification Methods 0.000 claims description 17
- 230000004048 modification Effects 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 6
- 229920001807 Urea-formaldehyde Polymers 0.000 claims description 5
- 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 claims description 4
- 229920002472 Starch Polymers 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000003112 inhibitor Substances 0.000 claims description 3
- 238000006116 polymerization reaction Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 235000019698 starch Nutrition 0.000 claims description 3
- 239000008107 starch Substances 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000002360 preparation method Methods 0.000 abstract description 4
- 238000005470 impregnation Methods 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ZNZYKNKBJPZETN-WELNAUFTSA-N Dialdehyde 11678 Chemical group N1C2=CC=CC=C2C2=C1[C@H](C[C@H](/C(=C/O)C(=O)OC)[C@@H](C=C)C=O)NCC2 ZNZYKNKBJPZETN-WELNAUFTSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 229920000881 Modified starch Polymers 0.000 description 1
- 239000004368 Modified starch Substances 0.000 description 1
- 229920001587 Wood-plastic composite Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000012620 biological material Substances 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- KHIWWQKSHDUIBK-UHFFFAOYSA-N periodic acid Chemical compound OI(=O)(=O)=O KHIWWQKSHDUIBK-UHFFFAOYSA-N 0.000 description 1
- -1 phenolic aldehyde Chemical class 0.000 description 1
- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
- 239000011155 wood-plastic composite Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/52—Impregnating agents containing mixtures of inorganic and organic compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G14/00—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00
- C08G14/02—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00 of aldehydes
- C08G14/04—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00 of aldehydes with phenols
- C08G14/12—Chemically modified polycondensates
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Phenolic Resins Or Amino Resins (AREA)
Abstract
The application discloses poplar wood modified liquid containing dialdehyde starch, which is characterized in that: the poplar wood modifying liquid formula containing dialdehyde starch comprises 480 parts of formaldehyde, 180 parts of urea, 7.6 parts of urotropine, 3.8 parts of phenol, 2 parts of corn starch, 4 parts of melamine, 265 parts of water, 35 parts of dialdehyde starch, 25 parts of urea, 0.5 part of borax, 3 parts of dithioethylene carbonate, 8 parts of epoxy acrylic resin, 0.22 part of KH-500 type silane coupling agent and 0.55 part of p-tert-butyl catechol. According to the formula, dialdehyde starch is added to replace part of formaldehyde in the preparation process, so that the environmental protection index is improved, the brittleness of the modified wood is reduced, and the toughness is improved. In the preparation process of the formula, the dithioethylene carbonate and the epoxy acrylic resin are added, so that the water resistance and the mechanical strength of the modified liquid are improved.
Description
Technical Field
The invention relates to wood modification, in particular to poplar wood modification liquid containing dialdehyde starch, and belongs to the field of forest chemical industry.
Background
Along with the increasingly reduced natural forest wood resources in the world, the price trend is continuously rising, and the artificial forest poplar is used as a base material to be modified into hardwood, and can be used as a substitute of natural forest wood. At present, the traditional chemical modification is to use resin products such as urea formaldehyde, phenolic aldehyde and the like as impregnation liquid, inject the impregnation liquid into a conduit, fibers and micro cells of wood by a pressurization method, and then dry the impregnation liquid to obtain the wood-plastic composite material. The urea-formaldehyde resin with larger dosage has the defects of poor water resistance, overproof environmental protection index and the like due to low cost. Dialdehyde starch is an oxide, usually periodic acid is used as the oxide, the main structure of dialdehyde starch is hydrated semialcohol and intramolecular and intermolecular semiacetal, and the dialdehyde starch can be used as aldehyde-containing material for reaction, thereby replacing part of formaldehyde to participate in the reaction and reducing the dosage of formaldehyde. With the gradual depletion of resources and the increasing concern of human beings on the environmental deterioration, the emerging biomass industry is rapidly rising in the global scope, agriculture and forestry biomass engineering is listed as a great special item in the China middle and long-term scientific and technological development plans promulgated and implemented in China, and the conversion of renewable resources such as massive agricultural products and the like into environment-friendly biological materials and chemical product substitutes with high added values is a research subject with long-term strategic significance. China is a large manufacturing country, the demand for modified wood resources is increased year by year, free phenol and formaldehyde in various traditional resin wood modifying solutions can bring adverse effects on the environment and the bodies of the people, and modified wood has poor water resistance, is not damp-proof, is brittle in material and is not beneficial to processing.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems of environmental pollution, poor water resistance, brittle material and the like of the traditional resin modified liquid, the poplar wood modified liquid containing dialdehyde starch is provided, and the problems in the prior art are solved.
The invention provides a poplar wood modification liquid containing dialdehyde starch, which comprises 510 parts by weight of formaldehyde 450-.
In some embodiments, the formulation of the poplar wood modifying liquid containing dialdehyde starch comprises 480 parts of formaldehyde, 180 parts of urea, 7.6 parts of urotropine, 3.8 parts of phenol, 2 parts of corn starch, 4 parts of melamine, 265 parts of water, 35 parts of dialdehyde starch, 25 parts of urea, 0.5 part of borax, 3 parts of dithioethylene carbonate, 8 parts of epoxy acrylic resin, 0.22 part of KH-500 type silane coupling agent and 0.55 part of p-tert-butyl catechol by weight.
A preparation method of poplar wood modified liquid containing dialdehyde starch comprises the following steps: step 1, adding dithioethylene carbonate and epoxy acrylic resin into a small reaction kettle, adjusting the temperature to 93-100 ℃, and stirring at a rotating speed of 100-130 r/min for 1-2 hours to obtain a modified solution for later use; step 2, adding formaldehyde, urotropine and phenol into a reaction kettle, stirring and heating to 55-58 ℃, slowly adding a first batch of urea (30% of the total amount of urea), stirring and heating to 90-93 ℃ after adding, carrying out heat preservation reaction for 50min, slowly adding a second batch of urea (60% of the total amount of urea), adjusting the pH value to be 5-6 by using a 40% sodium hydroxide solution, adding starch, reacting for 40min, adjusting the pH value to be 6-7 by using a 40% sodium hydroxide solution, slowly adding a third batch of urea (10% of the total amount of urea), adding melamine, reacting for 20min, adjusting the pH value to be 7-8 by using a 40% sodium hydroxide solution, stirring and cooling to 60 ℃ to obtain a low-molecular-weight urea-formaldehyde resin prepolymer for later use; step 3, adding water and dialdehyde starch into another reaction kettle, adjusting the pH value to 3.5-4.0 by using a 40% acetic acid solution, adding a first batch of urea (65% of the total amount of urea), stirring and heating to 60-65 ℃, keeping the temperature for 40min, adjusting the pH value to 3.0-3.5 by using a 40% acetic acid solution, stirring and heating to 75-80 ℃, keeping the temperature for 30min, adjusting the pH value to 2.5-3 by using a 40% acetic acid solution, stirring and heating to 90-95 ℃, keeping the temperature for 20min, adjusting the pH value to 7-8 by using a 40% sodium hydroxide solution, cooling to 70 ℃, adding borax, stirring and cooling to 60 ℃ to obtain low-viscosity dialdehyde starch adhesive for later use; and 4, adding the material in the step 3 into the reaction kettle in the step 2, stirring and keeping the temperature at 60 ℃, preserving the heat for 20min, cooling to 40 ℃, adding the modification liquid prepared in the step 1, adding a silane coupling agent of KH-550 type, adding p-tert-butylcatechol as a polymerization inhibitor, adjusting the temperature to 35-45 ℃, adjusting the revolution number to 100-130 r/min, and stirring for 40-50 min to obtain the poplar wood modification liquid containing dialdehyde starch.
The formaldehyde concentration in step 2 was 37%.
The dialdehyde starch in the step 3 is produced by Jinshan modified starch Co.Ltd in Taian city, the dialdehyde group substitution degree is 20%, the gelatinization temperature is 62-72 ℃, the PH value is 6.5-7.5, the fineness (100 mesh sieve) is more than or equal to 88%, and the water content is less than or equal to 15%.
Compared with other traditional resin methods, the method has the beneficial technical effects that:
(1) in the process of preparing the poplar wood modified liquid containing dialdehyde starch, the dialdehyde starch is added to replace part of formaldehyde, so that the environmental protection index is improved, the brittleness of the modified wood is reduced, and the toughness is improved.
(2) In the process of preparing the poplar wood modified liquid containing dialdehyde starch, the dithio-ethylene carbonate and the epoxy acrylic resin are added, so that the water resistance and the mechanical strength of the modified liquid are improved.
Detailed Description
Example 1: the formula of the poplar wood modification liquid containing dialdehyde starch comprises 450 parts of formaldehyde, 200 parts of urea, 7 parts of urotropine, 4 parts of phenol, 1 part of corn starch, 5 parts of melamine, 300 parts of water, 40 parts of dialdehyde starch, 28 parts of urea, 0.4 part of borax, 4 parts of dithioethylene carbonate, 7 parts of epoxy acrylic resin, 0.2 part of KH-500 type silane coupling agent and 0.6 part of p-tert-butyl catechol.
Example 2: the formula of the poplar wood modification liquid containing dialdehyde starch comprises 510 parts of formaldehyde, 150 parts of urea, 8 parts of urotropine, 3.6 parts of phenol, 3 parts of corn starch, 3 parts of melamine, 230 parts of water, 30 parts of dialdehyde starch, 23 parts of urea, 0.6 part of borax, 2 parts of dithioethylene carbonate, 9 parts of epoxy acrylic resin, 0.24 part of KH-500 type silane coupling agent and 0.5 part of p-tert-butyl catechol.
Example 3: the poplar wood modifying liquid formula containing dialdehyde starch comprises 480 parts of formaldehyde, 180 parts of urea, 7.6 parts of urotropine, 3.8 parts of phenol, 2 parts of corn starch, 4 parts of melamine, 265 parts of water, 35 parts of dialdehyde starch, 25 parts of urea, 0.5 part of borax, 3 parts of dithioethylene carbonate, 8 parts of epoxy acrylic resin, 0.22 part of KH-500 type silane coupling agent and 0.55 part of p-tert-butyl catechol.
A preparation method of poplar wood modified liquid containing dialdehyde starch comprises the following steps: step 1, adding dithioethylene carbonate and epoxy acrylic resin into a small reaction kettle, adjusting the temperature to 93-100 ℃, and stirring at a rotating speed of 100-130 r/min for 1-2 hours to obtain a modified solution for later use; step 2, adding formaldehyde, urotropine and phenol into a reaction kettle, stirring and heating to 55-58 ℃, slowly adding a first batch of urea (30% of the total amount of urea), stirring and heating to 90-93 ℃ after adding, carrying out heat preservation reaction for 50min, slowly adding a second batch of urea (60% of the total amount of urea), adjusting the pH value to be 5-6 by using a 40% sodium hydroxide solution, adding starch, reacting for 40min, adjusting the pH value to be 6-7 by using a 40% sodium hydroxide solution, slowly adding a third batch of urea (10% of the total amount of urea), adding melamine, reacting for 20min, adjusting the pH value to be 7-8 by using a 40% sodium hydroxide solution, stirring and cooling to 60 ℃ to obtain a low-molecular-weight urea-formaldehyde resin prepolymer for later use; step 3, adding water and dialdehyde starch into another reaction kettle, adjusting the pH value to 3.5-4.0 by using a 40% acetic acid solution, adding a first batch of urea (65% of the total amount of urea), stirring and heating to 60-65 ℃, keeping the temperature for 40min, adjusting the pH value to 3.0-3.5 by using a 40% acetic acid solution, stirring and heating to 75-80 ℃, keeping the temperature for 30min, adjusting the pH value to 2.5-3 by using a 40% acetic acid solution, stirring and heating to 90-95 ℃, keeping the temperature for 20min, adjusting the pH value to 7-8 by using a 40% sodium hydroxide solution, cooling to 70 ℃, adding borax, stirring and cooling to 60 ℃ to obtain low-viscosity dialdehyde starch adhesive for later use; and 4, adding the material in the step 3 into the reaction kettle in the step 2, stirring and keeping the temperature at 60 ℃, preserving the heat for 20min, cooling to 40 ℃, adding the modification liquid prepared in the step 1, adding a silane coupling agent of KH-550 type, adding p-tert-butylcatechol as a polymerization inhibitor, adjusting the temperature to 35-45 ℃, adjusting the revolution number to 100-130 r/min, and stirring for 40-50 min to obtain the poplar wood modification liquid containing dialdehyde starch.
The technical indexes of the wood modification liquid are as follows:
(1) appearance: white or light yellow liquid
(2) pH value: 7-8
(3) Viscosity (mp)as)：13.2
(4) Solid content: not less than 45
The application effect test of the poplar wood modification liquid containing dialdehyde starch comprises the following steps:
in the embodiment, a poplar board is selected as an experimental material, the modification treatment is carried out by using the above embodiments 1 to 3, and the wood impregnation modification treatment is carried out by adopting a vacuum pressurization mode; the vacuum pressurization conditions were: the vacuum degree is-0.096 MPa, the vacuum time is 1 hour, the pressurizing use pressure is 0.8MPa, the time is 3 hours, and the modified poplar board is obtained after the experimental material is dried.
The weight gain of the poplar modified wood treated by the poplar wood modified liquid containing dialdehyde starch is 60-130%, the density is improved by 60-120%, the surface hardness is improved by 70-150%, the water absorption is reduced by 80-160%, the elastic modulus is improved by 70-140%, the static bending strength is improved by 60-120%, and the formaldehyde release amount is 0.6mg/L, so that the poplar modified wood meets the requirement of the national standard E1.
The poplar modified wood treated by the poplar wood modified liquid containing dialdehyde starch has the advantages of high dimensional stability, excellent moisture resistance, no brittleness of the material, improved wood flexibility and suitability for deep processing and wood carving.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (3)
1. A poplar wood modifying solution containing dialdehyde starch is characterized in that: the formula of the poplar wood modification liquid containing dialdehyde starch comprises 510 parts by weight of formaldehyde 450-.
2. The poplar wood modifying solution containing dialdehyde starch as set forth in claim 1, wherein: the poplar wood modifying liquid formula containing dialdehyde starch comprises 480 parts of formaldehyde, 180 parts of urea, 7.6 parts of urotropine, 3.8 parts of phenol, 2 parts of corn starch, 4 parts of melamine, 265 parts of water, 35 parts of dialdehyde starch, 25 parts of urea, 0.5 part of borax, 3 parts of dithioethylene carbonate, 8 parts of epoxy acrylic resin, 0.22 part of KH-500 type silane coupling agent and 0.55 part of p-tert-butyl catechol.
3. The method for preparing poplar wood modifying liquid containing dialdehyde starch according to claim 1 or 2, comprising the following steps: step 1, adding dithioethylene carbonate and epoxy acrylic resin into a small reaction kettle, adjusting the temperature to 93-100 ℃, and stirring at a rotating speed of 100-130 r/min for 1-2 hours to obtain a modified solution for later use; step 2, adding formaldehyde, urotropine and phenol into a reaction kettle, stirring and heating to 55-58 ℃, slowly adding a first batch of urea (30% of the total amount of urea), stirring and heating to 90-93 ℃ after adding, carrying out heat preservation reaction for 50min, slowly adding a second batch of urea (60% of the total amount of urea), adjusting the pH value to be 5-6 by using a 40% sodium hydroxide solution, adding starch, reacting for 40min, adjusting the pH value to be 6-7 by using a 40% sodium hydroxide solution, slowly adding a third batch of urea (10% of the total amount of urea), adding melamine, reacting for 20min, adjusting the pH value to be 7-8 by using a 40% sodium hydroxide solution, stirring and cooling to 60 ℃ to obtain a low-molecular-weight urea-formaldehyde resin prepolymer for later use; step 3, adding water and dialdehyde starch into another reaction kettle, adjusting the pH value to 3.5-4.0 by using a 40% acetic acid solution, adding a first batch of urea (65% of the total amount of urea), stirring and heating to 60-65 ℃, keeping the temperature for 40min, adjusting the pH value to 3.0-3.5 by using a 40% acetic acid solution, stirring and heating to 75-80 ℃, keeping the temperature for 30min, adjusting the pH value to 2.5-3 by using a 40% acetic acid solution, stirring and heating to 90-95 ℃, keeping the temperature for 20min, adjusting the pH value to 7-8 by using a 40% sodium hydroxide solution, cooling to 70 ℃, adding borax, stirring and cooling to 60 ℃ to obtain low-viscosity dialdehyde starch adhesive for later use; and 4, adding the material in the step 3 into the reaction kettle in the step 2, stirring and keeping the temperature at 60 ℃, preserving the heat for 20min, cooling to 40 ℃, adding the modification liquid prepared in the step 1, adding a silane coupling agent of KH-550 type, adding p-tert-butylcatechol as a polymerization inhibitor, adjusting the temperature to 35-45 ℃, adjusting the revolution number to 100-130 r/min, and stirring for 40-50 min to obtain the poplar wood modification liquid containing dialdehyde starch.
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| CN202010272004.0A CN113492447A (en) | 2020-04-05 | 2020-04-05 | Poplar wood modifying liquid containing dialdehyde starch |
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| CN202010272004.0A CN113492447A (en) | 2020-04-05 | 2020-04-05 | Poplar wood modifying liquid containing dialdehyde starch |
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Application publication date: 20211012 |