CN115820178A - Glue for F4 star-grade shaving board, shaving board and preparation method of shaving board - Google Patents
Glue for F4 star-grade shaving board, shaving board and preparation method of shaving board Download PDFInfo
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- CN115820178A CN115820178A CN202211640121.3A CN202211640121A CN115820178A CN 115820178 A CN115820178 A CN 115820178A CN 202211640121 A CN202211640121 A CN 202211640121A CN 115820178 A CN115820178 A CN 115820178A
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- 239000003292 glue Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 81
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 71
- 239000004202 carbamide Substances 0.000 claims abstract description 71
- 239000007788 liquid Substances 0.000 claims abstract description 41
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 39
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims abstract description 39
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims abstract description 15
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 13
- 229920002521 macromolecule Polymers 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 60
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 52
- 239000000839 emulsion Substances 0.000 claims description 36
- 238000010438 heat treatment Methods 0.000 claims description 31
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 26
- 235000019253 formic acid Nutrition 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 21
- 239000003513 alkali Substances 0.000 claims description 18
- 239000012188 paraffin wax Substances 0.000 claims description 18
- 108090000623 proteins and genes Proteins 0.000 claims description 18
- 102000004169 proteins and genes Human genes 0.000 claims description 18
- 229920002545 silicone oil Polymers 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 230000018044 dehydration Effects 0.000 claims description 9
- 238000006297 dehydration reaction Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 7
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 239000002585 base Substances 0.000 claims description 3
- 229920002261 Corn starch Polymers 0.000 claims description 2
- 240000003183 Manihot esculenta Species 0.000 claims description 2
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims description 2
- 108010073771 Soybean Proteins Proteins 0.000 claims description 2
- 229920002472 Starch Polymers 0.000 claims description 2
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 2
- 239000008120 corn starch Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229910000028 potassium bicarbonate Inorganic materials 0.000 claims description 2
- 239000011736 potassium bicarbonate Substances 0.000 claims description 2
- 235000015497 potassium bicarbonate Nutrition 0.000 claims description 2
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 claims description 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 2
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 2
- 229940071440 soy protein isolate Drugs 0.000 claims description 2
- 239000008107 starch Substances 0.000 claims description 2
- 235000019698 starch Nutrition 0.000 claims description 2
- 239000011093 chipboard Substances 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 claims 1
- 229920000642 polymer Polymers 0.000 claims 1
- 229940086066 potassium hydrogencarbonate Drugs 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 description 35
- 235000011121 sodium hydroxide Nutrition 0.000 description 19
- 239000002023 wood Substances 0.000 description 14
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical class OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 11
- 239000002245 particle Substances 0.000 description 11
- 238000012360 testing method Methods 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 241000196324 Embryophyta Species 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229920001807 Urea-formaldehyde Polymers 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 229960000892 attapulgite Drugs 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052625 palygorskite Inorganic materials 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000004840 adhesive resin Substances 0.000 description 1
- 229920006223 adhesive resin Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- UDEWPOVQBGFNGE-UHFFFAOYSA-N benzoic acid n-propyl ester Natural products CCCOC(=O)C1=CC=CC=C1 UDEWPOVQBGFNGE-UHFFFAOYSA-N 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- OLXYLDUSSBULGU-UHFFFAOYSA-N methyl pyridine-4-carboxylate Chemical compound COC(=O)C1=CC=NC=C1 OLXYLDUSSBULGU-UHFFFAOYSA-N 0.000 description 1
- 235000011118 potassium hydroxide Nutrition 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 239000006254 rheological additive Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses glue for an F4 star-grade shaving board, the shaving board and a preparation method thereof. The glue for the F4 star-grade shaving board comprises the following raw materials in parts by weight: 40 to 60 portions of formaldehyde, 8 to 15 portions of macromolecular compound, 40 to 55 portions of urea, 3 to 12 portions of melamine and 0.2 to 4 portions of liquid auxiliary agent. The glue obtained by the preparation method through the specific components is used for producing the shaving board, and the formaldehyde emission in the obtained shaving board reaches the F4 star standard, so that the glue is safe and environment-friendly.
Description
Technical Field
The invention relates to the technical field of artificial boards, in particular to glue for an F4 star-grade shaving board, the shaving board and a preparation method thereof.
Background
Particle boards (particle boards) are artificial boards made of wood or non-wood plant materials, wherein wood shavings are made of the wood or non-wood plant materials, and then the wood shavings are pressed after glue is applied, and the artificial boards are a model for successful utilization of wood resources and changing waste into valuable, and are one of key products for the development of the wood industry in the future. Has attracted people's extensive attention since its birth and has become one of the post industries of the wood processing industry, and has gone through a refulgence history.
Formaldehyde is a recognized carcinogen in the world, stimulates respiratory tracts and harms body health. If the plant is resident in an environment with high formaldehyde content for a long time, the plant can cause death. The existing shaving board in the market at present generally has the defect of high formaldehyde emission.
Patent CN104842430A relates to a low-formaldehyde-content particle board, which comprises wood chip particles, an adhesive and propyl benzoate, wherein the adhesive is a modified urea-formaldehyde resin, the modified urea-formaldehyde resin is composed of urea-formaldehyde resin, diatomite and attapulgite, and the preparation method comprises the following steps: mixing formaldehyde, urea and kieselguhr, heating, adjusting the pH value to 6.5-7.5, adding the urea and the kieselguhr for reaction, adjusting the pH value to 7.5-7.8, adding the urea and the kieselguhr for reaction when the temperature is reduced to 75-80 ℃, and filtering to obtain filtrate; adding urea and diatomite into the obtained filtrate, cooling to 35-45 ℃, adjusting the pH value to 7.2-7.5, adding attapulgite, and uniformly mixing to obtain modified urea-formaldehyde resin; the formaldehyde emission of the shaving board obtained by the invention is 3mg/100g, which is far higher than the industry environmental protection standards E0 grade and E1 grade.
Patent CN106883365B discloses an E0-grade environment-friendly modified urea-formaldehyde resin for a particle board and a preparation method thereof, wherein the E0-grade environment-friendly modified urea-formaldehyde resin for the particle board comprises the following raw materials in parts by weight: 45-52 parts of formaldehyde, 40-68 parts of urea, 2-4 parts of melamine, 0.05-0.10 part of polyvinyl alcohol, 0.2-0.4 part of rheological modifier and a proper amount of acid and alkali, wherein the prepared urea-formaldehyde resin is used for pressing plates, and the formaldehyde release amount reaches 2.5-3.5 mg/100g.
The invention discloses an E0-grade environment-friendly modified urea-formaldehyde resin for a particle board and a preparation method thereof, and the E0-grade environment-friendly modified urea-formaldehyde resin adopts low-molar-ratio high-concentration formaldehyde and urea as main raw materials, and is modified by adding polyvinyl alcohol, melamine and a reinforcing agent, so that the formaldehyde emission of the particle board prepared from the obtained E0-grade environment-friendly modified urea-formaldehyde resin reaches the E0-grade standard (less than or equal to 5.0mg/100 g).
With the development of the artificial board industry, higher requirements are put forward on the glue for the shaving board, particularly the free formaldehyde content in the glue and the formaldehyde emission in the artificial board, and the formaldehyde emission of the adhesive resin (glue) obtained in the patent when used for the board is higher, so that the market requirements cannot be met. Therefore, reducing the formaldehyde emission in particle boards also becomes a hot spot of general attention in the wood industry and people.
Disclosure of Invention
The invention aims to provide glue for an F4 star-grade shaving board, the shaving board and a preparation method thereof. The formaldehyde emission of the shaving board obtained by the invention is lower than 0.05 percent and is far better than the F4 star standard in the Japanese JISA5908 standard.
In order to achieve the purpose, the invention adopts the following technical scheme:
the glue for the shaving board comprises the following raw materials in parts by weight: 40 to 60 portions of formaldehyde, 8 to 15 portions of macromolecular compound, 40 to 55 portions of urea, 3 to 12 portions of melamine and 0.2 to 4 portions of liquid auxiliary agent.
Further, the glue comprises the following raw materials in parts by weight: 50-55 parts of formaldehyde, 8-10 parts of macromolecular compound, 40-45 parts of urea, 5-8 parts of melamine and 0.2-3 parts of liquid additive.
Further, the macromolecular compound is at least one selected from the following components: sodium carboxymethylcellulose, defatted protein, soy protein isolate, corn starch and tapioca starch, preferably defatted protein.
Further, the liquid auxiliary agent is 0.2-1 part of paraffin emulsion and 0.2-1 part of silicone oil emulsion; further comprises 0.3 to 0.6 portion of paraffin emulsion and 0.3 to 0.6 portion of silicone oil emulsion.
The glue disclosed by the invention can be used for producing flakeboards, such as Oriented Strand Boards (OSB), the OSB serving as a novel artificial board has the advantages of stable structure, high strength, small deformation, good waterproofness and easiness in processing, is a good environment-friendly material suitable for being used as wood structure building wall surfaces, building templates, roofs, heat-insulation and sound-insulation insulating plates, I-beams, wood keels and the like, and has great market potential.
The invention also provides a preparation method of the glue for the shaving board, which comprises the following steps:
(1) Mixing and stirring formaldehyde and a macromolecular compound, and adjusting the pH to be 8.5-9.6;
(2) Heating the temperature to 40-50 ℃, adding melamine for the first time, heating the temperature to 58-62 ℃, keeping the temperature for 15-20 minutes, and adjusting the pH to be 8.0-8.4;
(3) Adding the first urea, heating to 95-97 ℃, reacting for 5-15 minutes, rapidly cooling to 84-86 ℃, and adjusting the pH to be 5.2-5.8;
(4) Adjusting the pH = 6.0-6.8 after the end point viscosity is controlled to be 16-18 seconds, adding the urea and the melamine for the second time, adjusting the pH = 7.5-8.0 after the end point viscosity is controlled to be 16-18 seconds, and adding the urea for the third time to perform heat preservation and dehydration at the temperature of 60-75 ℃;
(5) Adding liquid auxiliary agent to adjust the pH = 8.0-8.5, adding urea for the fourth time to react, cooling to 30-35 ℃, adjusting the pH = 8.0-8.5, and discharging.
Furthermore, the dosage of the first urea feeding is 16-18 parts, the dosage of the second urea feeding is 8-10 parts, the dosage of the third urea feeding is 6-8 parts, and the dosage of the fourth urea feeding is 10-12 parts.
The invention adds urea for 4 times, which is easy to control the reaction, is beneficial to improving the curing speed and the storage stability of the urea-formaldehyde resin, and can ensure that the urea and the formaldehyde fully react.
Furthermore, the dosage of the first melamine feeding is 3-5 parts, and the dosage of the second melamine feeding is 2-3 parts.
Further, the pH is adjusted with an acid or a base in the step.
Further, the acid is selected from one of sulfuric acid, hydrochloric acid, phosphoric acid and formic acid or a mixture thereof; further 20 to 25% of acid.
Further, the alkali is selected from at least one of sodium hydroxide, potassium hydroxide and potassium bicarbonate; further 30 to 35% of alkali.
Compared with the prior art, the invention has the following effects:
when the glue is used for producing shaving boards, the obtained shaving boards are milky white, and the pH value is as follows: 7.5 to 8.5, solid content of 60 to 65 percent, viscosity of 40 to 50 seconds/25 ℃, short curing time, high production efficiency, free formaldehyde less than or equal to 0.05 percent, which is far superior to the F4 star standard in the Japanese JISA5908 standard, and stable product quality.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
It should be understood that the experimental methods used in the following examples are all conventional methods unless otherwise specified, and that the materials, reagents, etc. used in the following examples are commercially available without otherwise specified.
The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, or article that comprises a listed element is not necessarily limited to only those elements, but may include other elements not expressly listed or inherent to such composition, step, method, or article.
Example 1
The glue for the F4 star-grade shaving board has the following formula: 50 parts of formaldehyde, 10 parts of degreased protein, 45 parts of urea, a proper amount of liquid caustic soda with the concentration of 30%, a proper amount of formic acid with the concentration of 25%, 8 parts of melamine, 0.3 part of paraffin emulsion and 0.3 part of silicone oil emulsion.
The preparation method comprises the following steps:
(1) Adding 50 parts of formaldehyde and 10 parts of defatted protein into a reaction vessel, stirring, adding 30% liquid alkali, and adjusting the pH to be 8.5-9.6.
(2) Heating the temperature to 40-50 ℃ in a reaction kettle, adding 5 parts of melamine, heating to 60 ℃, keeping the temperature for 15-20 minutes, measuring the pH value, and gradually adding 25% formic acid to ensure that the pH value is = 8.0-8.4.
(3) Adding 16 parts of urea, gradually heating to 95-97 ℃ within 40-45 minutes, reacting for 10 minutes, rapidly cooling to 84-86 ℃, gradually adding 25% formic acid to ensure that the pH is 5.2-5.8, the reaction temperature is controlled to 84-86 ℃, and the end point viscosity is controlled to 16-18 seconds (4 # cup/25 ℃).
(4) After the viscosity reaches the required value, 30% liquid caustic soda is added to make the pH = 6.0-6.8, 10 parts of urea and 3 parts of melamine are added, and the mixture is reacted until the viscosity reaches 20-22 seconds (4 # cup/25 ℃).
(5) Immediately after the viscosity reaches the requirement, adding 30% liquid caustic soda to make the pH = 7.5-8.0, adding 8 parts of urea, and carrying out heat preservation at 60-75 ℃ for 20 minutes for dehydration.
(6) Adding 0.3 part of auxiliary agent paraffin emulsion and 0.3 part of silicone oil emulsion, adjusting the pH to 8.0-8.5, adding the residual urea for reaction, cooling to 30-35 ℃, adjusting the pH to 8.0-8.5, and discharging after the test is qualified.
Example 2
The glue for the F4 star-grade shaving board has the following formula: 55 parts of formaldehyde, 12 parts of defatted protein, 40 parts of urea, a proper amount of 30% liquid caustic soda, a proper amount of 25% formic acid, 5 parts of melamine, 0.5 part of paraffin emulsion and 0.5 part of silicone oil emulsion.
The preparation method comprises the following steps:
(1) Adding 55 parts of formaldehyde and 12 parts of defatted protein into a reaction vessel, stirring, adding 30% liquid alkali, and adjusting the pH = 8.5-9.6.
(2) Heating the temperature to 40-50 ℃ in a reaction kettle, adding 3 parts of melamine, heating to 60 ℃, keeping the temperature for 15-20 minutes, measuring the pH value, and gradually adding 25% formic acid to ensure that the pH value is = 8.0-8.4.
(3) Adding 18 parts of urea, gradually heating to 95-97 ℃ within 40-45 minutes, reacting for 10 minutes, rapidly cooling to 84-86 ℃, gradually adding 25% formic acid to ensure that the pH is 5.2-5.8, the reaction temperature is controlled to 84-86 ℃, and the final viscosity is controlled to 16-18 seconds (4 # cup/25 ℃).
(4) After the viscosity reaches the required value, 30% liquid alkali is added to make the pH = 6.0-6.8, 8 parts of urea and 2 parts of melamine are added, and the mixture is reacted until the viscosity reaches 20-22 seconds (4 # cup/25 ℃).
(5) Immediately after the viscosity reaches the requirement, adding 30% liquid caustic soda to make pH = 7.5-8.0, adding 6 parts of urea, and keeping the temperature at 60-75 ℃ for 20 minutes for dehydration.
(6) Adding 0.5 part of auxiliary agent paraffin emulsion and 0.5 part of silicone oil emulsion, adjusting the pH to 8.0-8.5, adding the residual urea for reaction, cooling to 30-35 ℃, adjusting the pH to 8.0-8.5, and discharging after the test is qualified.
Example 3
The glue for the F4 star-grade shaving board has the following formula: 50 parts of formaldehyde, 10 parts of degreased protein, 45 parts of urea, a proper amount of liquid caustic soda with the concentration of 30%, a proper amount of formic acid with the concentration of 25%, 7 parts of melamine, 0.3 part of paraffin emulsion and 0.3 part of silicone oil emulsion.
The preparation method comprises the following steps:
(1) Adding 50 parts of formaldehyde and 10 parts of defatted protein into a reaction vessel, stirring, adding 30% liquid alkali, and adjusting the pH = 8.5-9.6.
(2) Heating the temperature to 40-50 ℃ in a reaction kettle, adding 4 parts of melamine, heating to 60 ℃, keeping the temperature for 15-20 minutes, measuring the pH value, and gradually adding 25% formic acid to ensure that the pH value is = 8.0-8.4.
(3) Adding 17 parts of urea, gradually heating to 95-97 ℃ within 40-45 minutes, reacting for 10 minutes, rapidly cooling to 84-86 ℃, gradually adding 25% formic acid to ensure that the pH is 5.2-5.8, the reaction temperature is controlled to 84-86 ℃, and the final viscosity is controlled to 16-18 seconds (4 # cup/25 ℃).
(4) After the viscosity reaches the required value, 30% liquid alkali is added to make the pH = 6.0-6.8, 9 parts of urea and 3 parts of melamine are added, and the mixture is reacted until the viscosity reaches 20-22 seconds (4 # cup/25 ℃).
(5) Immediately after the viscosity reaches the requirement, adding 30% liquid caustic soda to make pH = 7.5-8.0, adding 6 parts of urea, and keeping the temperature at 60-75 ℃ for 20 minutes for dehydration.
(6) Adding 0.3 part of auxiliary agent paraffin emulsion and 0.3 part of silicone oil emulsion, adjusting the pH to 8.0-8.5, adding the residual urea for reaction, cooling to 30-35 ℃, adjusting the pH to 8.0-8.5, and discharging after the test is qualified.
Example 4
The glue for the F4 star-grade shaving board has the following formula: 50 parts of formaldehyde, 10 parts of degreased protein, 45 parts of urea, a proper amount of liquid alkali with the concentration of 30%, a proper amount of formic acid with the concentration of 25%, 6 parts of melamine, 0.3 part of paraffin emulsion and 0.3 part of silicone oil emulsion.
The preparation method comprises the following steps:
(1) Adding 50 parts of formaldehyde and 10 parts of defatted protein into a reaction vessel, stirring, adding 30% liquid alkali, and adjusting the pH = 8.5-9.6.
(2) Heating the temperature to 40-50 ℃ in a reaction kettle, adding 4 parts of melamine, heating to 60 ℃, keeping the temperature for 15-20 minutes, measuring the pH value, and gradually adding 25% formic acid to ensure that the pH value is = 8.0-8.4.
(3) Adding 18 parts of urea, gradually heating to 95-97 ℃ within 40-45 minutes, reacting for 10 minutes, rapidly cooling to 84-86 ℃, gradually adding 25% formic acid to ensure that the pH is 5.2-5.8, the reaction temperature is controlled to 84-86 ℃, and the final viscosity is controlled to 16-18 seconds (4 # cup/25 ℃).
(4) After the viscosity reaches the required value, 30% liquid alkali is added to make the pH = 6.0-6.8, 9 parts of urea and 2 parts of melamine are added, and the mixture is reacted until the viscosity reaches 20-22 seconds (4 # cup/25 ℃).
(5) Immediately after the viscosity reaches the requirement, adding 30% liquid caustic soda to make the pH = 7.5-8.0, adding 7 parts of urea, and keeping the temperature at 60-75 ℃ for 20 minutes for dehydration.
(6) Adding 0.3 part of auxiliary agent paraffin emulsion and 0.3 part of silicone oil emulsion, adjusting the pH to 8.0-8.5, adding the residual urea for reaction, cooling to 30-35 ℃, adjusting the pH to 8.0-8.5, and discharging after the test is qualified.
Comparative example 1
Compared to example 1, only 3 urea additions were made.
The glue for the F4 star-grade shaving board has the following formula: 50 parts of formaldehyde, 10 parts of degreased protein, 45 parts of urea, a proper amount of liquid caustic soda with the concentration of 30%, a proper amount of formic acid with the concentration of 25%, 8 parts of melamine, 0.3 part of paraffin emulsion and 0.3 part of silicone oil emulsion.
The preparation method comprises the following steps:
(1) Adding 50 parts of formaldehyde and 10 parts of defatted protein into a reaction vessel, stirring, adding 30% liquid alkali, and adjusting the pH = 8.5-9.6.
(2) Heating the temperature to 40-50 ℃ in a reaction kettle, adding 5 parts of melamine, heating to 60 ℃, keeping the temperature for 15-20 minutes, measuring the pH value, and gradually adding 25% formic acid to ensure that the pH value is = 8.0-8.4.
(3) Adding 16 parts of urea, gradually heating to 95-97 ℃ within 40-45 minutes, reacting for 10 minutes, rapidly cooling to 84-86 ℃, gradually adding 25% formic acid to ensure that the pH is 5.2-5.8, the reaction temperature is controlled to 84-86 ℃, and the end point viscosity is controlled to 16-18 seconds (4 # cup/25 ℃).
(4) After the viscosity reaches the required value, 30% liquid caustic soda is added to make the pH = 6.0-6.8, 10 parts of urea and 3 parts of melamine are added, and the mixture is reacted until the viscosity reaches 20-22 seconds (4 # cup/25 ℃).
(5) Immediately after the viscosity reaches the requirement, adding 30% liquid caustic soda to make the pH = 7.5-8.0, adding the rest urea, and keeping the temperature at 60-75 ℃ for 20 minutes for dehydration.
(6) Adding 0.3 part of auxiliary agent paraffin emulsion and 0.3 part of silicone oil emulsion, adjusting the pH to 8.0-8.5, cooling to 30-35 ℃, adjusting the pH to 8.0-8.5, and discharging after the inspection is qualified.
Comparative example 2
In comparison with example 1, no auxiliaries were added.
The glue for the F4 star-grade shaving board comprises the following formula: 50 parts of formaldehyde, 10 parts of defatted protein, 45 parts of urea, a proper amount of 30% liquid caustic soda, a proper amount of 25% formic acid and 8 parts of melamine.
The preparation method comprises the following steps:
(1) Adding 50 parts of formaldehyde and 10 parts of defatted protein into a reaction vessel, stirring, adding 30% liquid alkali, and adjusting the pH = 8.5-9.6.
(2) Heating the temperature to 40-50 ℃ in a reaction kettle, adding 5 parts of melamine, heating to 60 ℃, keeping the temperature for 15-20 minutes, measuring the pH value, and gradually adding 25% formic acid to ensure that the pH value is = 8.0-8.4.
(3) Adding 16 parts of urea, gradually heating to 95-97 ℃ within 40-45 minutes, reacting for 10 minutes, rapidly cooling to 84-86 ℃, gradually adding 25% formic acid to ensure that the pH is 5.2-5.8, the reaction temperature is controlled to 84-86 ℃, and the end point viscosity is controlled to 16-18 seconds (4 # cup/25 ℃).
(4) After the viscosity reaches the required value, 30% liquid caustic soda is added to make the pH = 6.0-6.8, 10 parts of urea and 3 parts of melamine are added, and the mixture is reacted until the viscosity reaches 20-22 seconds (4 # cup/25 ℃).
(5) Immediately adding 30% liquid alkali after the viscosity reaches the requirement to ensure that the pH is 7.5-8.0, adding 8 parts of urea, keeping the temperature at 60-75 ℃ for 20 minutes for dehydration, adjusting the pH to 8.0-8.5, adding the residual urea for reaction, cooling to 30-35 ℃, adjusting the pH to 8.0-8.5, and discharging after the test is qualified.
Comparative example 3
The pH after the reaction was different from that of example 1.
The glue for the F4 star-grade shaving board has the following formula: 50 parts of formaldehyde, 10 parts of degreased protein, 45 parts of urea, a proper amount of liquid caustic soda with the concentration of 30%, a proper amount of formic acid with the concentration of 25%, 8 parts of melamine, 0.3 part of paraffin emulsion and 0.3 part of silicone oil emulsion.
The preparation method comprises the following steps:
(1) Adding 50 parts of formaldehyde and 10 parts of defatted protein into a reaction vessel, stirring, adding 30% liquid alkali, and adjusting the pH = 8.0-8.4.
(2) Heating the temperature to 40-50 ℃ in a reaction kettle, adding 5 parts of melamine, heating to 60 ℃, keeping the temperature for 15-20 minutes, measuring the pH value, and gradually adding 25% formic acid to ensure that the pH value is = 7.0-7.4.
(3) Adding 16 parts of urea, gradually heating to 95-97 ℃ within 40-45 minutes, reacting for 10 minutes, rapidly cooling to 84-86 ℃, gradually adding 25% formic acid to ensure that the pH is 5.2-5.8, the reaction temperature is controlled to 84-86 ℃, and the end point viscosity is controlled to 16-18 seconds (4 # cup/25 ℃).
(4) After the viscosity reaches the required value, 30% liquid alkali is added to make the pH = 4.0-4.8, 10 parts of urea and 3 parts of melamine are added, and the mixture is reacted until the viscosity reaches 20-22 seconds (4 # cup/25 ℃).
(5) Immediately after the viscosity reaches the requirement, adding 30% liquid caustic soda to make pH = 8.5-9.0, adding 8 parts of urea, and dehydrating at 60-75 ℃ for 20 minutes.
(6) Adding 0.3 part of auxiliary agent paraffin emulsion and 0.3 part of silicone oil emulsion, adjusting the pH to 8.0-8.5, adding the residual urea for reaction, cooling to 30-35 ℃, adjusting the pH to 8.0-8.5, and discharging after the test is qualified.
Comparative example 4
In comparison with example 1, the urea was divided into 5 charges.
The glue for the F4 star-grade shaving board has the following formula: 50 parts of formaldehyde, 10 parts of degreased protein, 45 parts of urea, a proper amount of liquid caustic soda with the concentration of 30%, a proper amount of formic acid with the concentration of 25%, 8 parts of melamine, 0.3 part of paraffin emulsion and 0.3 part of silicone oil emulsion.
The preparation method comprises the following steps:
(1) Adding 50 parts of formaldehyde and 10 parts of defatted protein into a reaction vessel, stirring, adding 30% liquid alkali, and adjusting the pH = 8.5-9.6.
(2) Heating the temperature to 40-50 ℃ in a reaction kettle, adding 5 parts of melamine, heating to 60 ℃, keeping the temperature for 15-20 minutes, measuring the pH value, and gradually adding 25% formic acid to ensure that the pH value is = 8.0-8.4.
(3) Adding 16 parts of urea, gradually heating to 95-97 ℃ within 40-45 minutes, reacting for 10 minutes, adding 5 parts of urea, rapidly cooling to 84-86 ℃, gradually adding 25% formic acid to ensure that the pH is 5.2-5.8, the reaction temperature is controlled to be 84-86 ℃, and the end point viscosity is controlled to be 16-18 seconds (4 # cup/25 ℃).
(4) After the viscosity reaches the required value, 30% liquid caustic soda is added to make the pH = 6.0-6.8, 10 parts of urea and 3 parts of melamine are added, and the mixture is reacted until the viscosity reaches 20-22 seconds (4 # cup/25 ℃).
(5) Immediately after the viscosity reaches the requirement, adding 30% liquid caustic soda to make the pH = 7.5-8.0, adding 8 parts of urea, and carrying out heat preservation at 60-75 ℃ for 20 minutes for dehydration.
(6) Adding 0.3 part of auxiliary agent paraffin emulsion and 0.3 part of silicone oil emulsion, adjusting the pH to 8.0-8.5, adding the residual urea for reaction, cooling to 30-35 ℃, adjusting the pH to 8.0-8.5, and discharging after the test is qualified.
The glue prepared in the examples 1 to 4 and the comparative examples 1 to 4 is mixed with wood shavingsPaving and prepressing at 180-240 deg.c and 22-28 MPa/m 2 Hot pressing under the condition of (1) to obtain the F4 star-grade shaving board.
The quality indexes of the F4 star-grade shaving board are shown in the following table:
as can be seen from the above table, the particle board for F4 star class according to the invention has high solid content, free formaldehyde content up to F4 star class standard in Japanese JISA5908 standard, and particle board on the market generally up to E0 standard 0.5mg/L. According to the invention, through a specific glue formula and process conditions, the obtained shaving board has low formaldehyde content, meets the certification standard of an F4 star-grade shaving board, and realizes the advantages of safety and environmental protection of similar adhesive raw materials.
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as can be conceived and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.
Claims (10)
1. The glue for the shaving board is characterized by comprising the following raw materials in parts by weight: 40 to 60 portions of formaldehyde, 8 to 15 portions of macromolecular compound, 40 to 55 portions of urea, 3 to 12 portions of melamine and 0.2 to 4 portions of liquid additive.
2. The glue according to claim 1, characterized by comprising the following raw materials in parts by weight: 50-55 parts of formaldehyde, 8-10 parts of macromolecular compound, 40-45 parts of urea, 5-8 parts of melamine and 0.2-3 parts of liquid additive.
3. The glue of claim 1 or 2, wherein the polymer compound is at least one selected from the following components: sodium carboxymethylcellulose, defatted protein, soy protein isolate, corn starch and tapioca starch, preferably defatted protein.
4. The glue of claim 1 or 2, wherein the liquid auxiliary agent is paraffin emulsion 0.2-1 part, silicone oil emulsion 0.2-1 part; further comprises 0.3 to 0.6 portion of paraffin emulsion and 0.3 to 0.6 portion of silicone oil emulsion.
5. A process for the preparation of a glue for chipboard according to any of claims 1 to 4, characterised in that it comprises the following steps:
(1) Mixing and stirring formaldehyde and a macromolecular compound, and adjusting the pH to be 8.5-9.6;
(2) Heating the temperature to 40-50 ℃, adding melamine for the first time, heating the temperature to 58-62 ℃, keeping the temperature for 15-20 minutes, and adjusting the pH to be 8.0-8.4;
(3) Adding the first urea, heating to 95-97 ℃, reacting for 5-15 minutes, rapidly cooling to 84-86 ℃, and adjusting the pH = 5.2-5.8;
(4) Adjusting the pH = 6.0-6.8 after the end point viscosity is controlled to be 16-18 seconds, adding the urea and the melamine for the second time, adjusting the pH = 7.5-8.0 after the end point viscosity is controlled to be 16-18 seconds, and adding the urea for the third time to perform heat preservation and dehydration at the temperature of 60-75 ℃;
(5) Adding liquid auxiliary agent to adjust the pH = 8.0-8.5, adding urea for the fourth time to react, cooling to 30-35 ℃, adjusting the pH = 8.0-8.5, and discharging.
6. The process according to claim 5, wherein the first urea charge is 16 to 18 parts, the second urea charge is 8 to 10 parts, the third urea charge is 6 to 8 parts and the fourth urea charge is 10 to 12 parts.
7. A process according to claim 5, characterized in that the first melamine charge is present in an amount of 3 to 5 parts and the second melamine charge is present in an amount of 2 to 3 parts.
8. The method according to claim 5, wherein the pH is adjusted with an acid or a base.
9. The method according to claim 8, wherein the acid is selected from one of sulfuric acid, hydrochloric acid, phosphoric acid, formic acid, or a mixture thereof; further 20 to 25% of an acid.
10. The production method according to claim 8, wherein the base is at least one selected from the group consisting of sodium hydroxide, potassium hydroxide, and potassium hydrogencarbonate; further 30 to 35% of an alkali.
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