CN116145461B - Application of Tris buffer as curing agent in preparation of urea-formaldehyde resin adhesive impregnated paper - Google Patents
Application of Tris buffer as curing agent in preparation of urea-formaldehyde resin adhesive impregnated paper Download PDFInfo
- Publication number
- CN116145461B CN116145461B CN202310032130.2A CN202310032130A CN116145461B CN 116145461 B CN116145461 B CN 116145461B CN 202310032130 A CN202310032130 A CN 202310032130A CN 116145461 B CN116145461 B CN 116145461B
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- China
- Prior art keywords
- urea
- curing agent
- formaldehyde resin
- resin adhesive
- tris buffer
- Prior art date
- 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.)
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 63
- 239000000853 adhesive Substances 0.000 title claims abstract description 51
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 51
- 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 title claims abstract description 51
- 229920001807 Urea-formaldehyde Polymers 0.000 title claims abstract description 48
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 239000007983 Tris buffer Substances 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000002253 acid Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000003139 buffering effect Effects 0.000 claims abstract description 4
- 239000007864 aqueous solution Substances 0.000 claims abstract description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- 229910017604 nitric acid Inorganic materials 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 239000003292 glue Substances 0.000 abstract description 5
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 abstract description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 10
- 238000002474 experimental method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 239000003094 microcapsule Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
- D21H17/57—Polyureas; Polyurethanes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/09—Sulfur-containing compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/65—Acid compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Phenolic Resins Or Amino Resins (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention relates to a curing agent of polymer glue and a use method thereof, and particularly discloses an application of a Tris buffer agent as a curing agent in preparation of urea-formaldehyde resin glue impregnated paper. The Tris buffer used as curing agent is prepared by adjusting pH after the preparation of aqueous solution of Tris (hydroxymethyl) aminomethane and acid, the pH is 7.0-8.0, the concentration is 35-39%, and the Tris buffer has pH buffering performance at normal temperature. The adding amount of the Tris buffer serving as the curing agent is 0.19-0.26% of the mass of the urea-formaldehyde resin adhesive. The urea-formaldehyde resin adhesive curing agent is simple to prepare and convenient to use. The curing agent has a pH buffering function at normal temperature, is favorable for preserving urea-formaldehyde resin adhesive impregnated paper, and has a curing function when the temperature is increased and the pH is reduced when the temperature is Wen Yaban. The curing agent solves the problem that the curing effect of the existing curing agent is mutually conflicted when the urea-formaldehyde resin adhesive impregnated paper is stored and pressed.
Description
Technical Field
The invention relates to a curing agent of polymer glue and a use method thereof, in particular to an application of a Tris buffer agent as the curing agent in the preparation of urea-formaldehyde resin glue impregnated paper.
Background
Along with the rapid development of the wood industry and the artificial board industry, the demand of the artificial board is increasing, and the urea-formaldehyde resin adhesive applied to the artificial board industry is also widely applied. The urea-formaldehyde resin adhesive impregnated paper is hot-pressed on the board, so that the board is beautified while the board is reinforced, and the artificial board is widely applied.
The urea-formaldehyde resin adhesive is a prepolymer containing polyhydroxy and amino groups, and the prepolymer can be further condensed into a high molecular compound through condensation between the polyhydroxy and the amino groups so as to be cured and hardened, namely the urea-formaldehyde resin adhesive is cured, and a curing agent is generally required to be added for curing the urea-formaldehyde resin adhesive. The urea-formaldehyde resin adhesive impregnated paper is cured when hot pressed on the base material, and therefore, the curing agent is added to the urea-formaldehyde resin adhesive when preparing the impregnated paper, that is, the urea-formaldehyde resin adhesive impregnated paper contains the curing agent.
Impregnated paper itself is also a commodity in the artificial board industry and is not necessarily used at present, and needs to be stored for a certain time. The curing agents for the urea-formaldehyde resin adhesive for impregnated paper can be classified into a direct curing system, a latent curing system and a microcapsule curing system according to curing characteristics.
The direct curing system directly uses acid substances such as boric acid, phosphoric acid and the like as curing agents, and the curing system has curing performance after being added, so that the direct curing system can not be used for curing urea-formaldehyde resin adhesives for impregnated paper when the compression plate is prepared from wood chips.
The microcapsule curing system has the problems of wrapping, releasing acid, releasing speed, uniform distribution and the like, and does not meet the industrial requirements.
At present, urea-formaldehyde resin adhesives for impregnated paper are all latent curing systems. The latent curing system is a single-component system such as NH 4 Cl, hydrogen peroxide or a two-component system, and the curing mechanism is that a curing agent contains substances which can react with formaldehyde so as to release acid for curing. Such latent curing systems have the following problems: (1) The urea-formaldehyde resin adhesive on the prepared impregnated paper is slowly cured during the storage period at room temperature, and the urea-formaldehyde resin adhesive loses cohesiveness after long time, so that the impregnated paper loses use value; (2) This latent curing system cannot be used in low formaldehyde urea glues.
Disclosure of Invention
The invention aims to overcome the defects of a urea-formaldehyde resin adhesive curing system for impregnated paper, which are pointed out in the background art, and provides a urea-formaldehyde resin adhesive curing system which is not cured at room temperature and is cured at high temperature during pressing, and a method which is convenient and quick to use is provided for meeting the requirements of the urea-formaldehyde resin adhesive curing system for impregnated paper in the production of artificial boards.
The curing agent of the urea-formaldehyde resin adhesive is prepared by adjusting the pH value of Tris buffer (Tris (hydroxymethyl) aminomethane and acid) to 7.0-8.0. The specific preparation method comprises the following steps: and (3) dropwise adding acid into the aqueous solution of the Tris to adjust the pH to 7.0-8.0, thereby obtaining the Tris buffer.
Wherein, the acid used for preparing the urea-formaldehyde resin adhesive curing agent is one of nitric acid, sulfuric acid and p-toluenesulfonic acid or a mixture of a plurality of acids.
The concentration of the urea-formaldehyde resin adhesive curing agent is 35-39%.
The urea-formaldehyde resin adhesive curing agent is applied to the preparation of urea-formaldehyde resin adhesive impregnated paper. The curing agent has the pH buffering function at room temperature, the pH is maintained stable, the curing function is weak, and the curing agent is favorable for preserving the urea-formaldehyde resin adhesive impregnated paper.
When the high-temperature pressing plate is used, the temperature is increased, the pH is reduced, and the curing function is realized, so that the low-formaldehyde urea-formaldehyde resin adhesive for impregnated paper can be applied to curing.
The using method of the curing agent comprises the following steps: when the urea-formaldehyde resin adhesive impregnated paper is prepared, the curing agent is added into the prepared urea-formaldehyde resin adhesive and stirred uniformly.
The adding amount of the urea-formaldehyde resin adhesive curing agent is 0.19-0.26% of the mass of the urea-formaldehyde resin adhesive.
The combination of the components of the curing agent and the addition range are determined through a large number of curing effects and latency tests and analysis and summary of experimental results. Compared with the curing agent used in the current industry, the curing agent is added into the urea-formaldehyde resin adhesive according to the addition amount determined by experiments, the room-temperature storage period of the urea-formaldehyde resin adhesive is greatly prolonged, and the latent effect of the curing agent is obvious.
The urea-formaldehyde resin adhesive curing agent is simple to prepare and convenient to use, and the curing agent solves the problem that the curing effect of the existing curing agent is mutually interfered when the urea-formaldehyde resin adhesive impregnated paper is stored and pressed.
Detailed Description
The present application will be illustrated and further understood by reference to the following specific examples, which are given by way of illustration only and are not to be construed as limiting the overall scope of the application. All simple changes or substitutions with the same or similar technical characteristics are within the protection scope of the application.
Example 1
Preparation of curing agent
Based on a large number of early experiments and analysis, curing agents are prepared, as shown in table 1, wherein the 5-8 curing agents of the patent, the 1-2 curing agents which are used in industrialized application, the 3-4 curing agents which are used in industrialized application at present, and the 1-4 curing agents are used as comparison.
TABLE 1 curing agent formulation
Determination of the amount of curing agent to be added
The addition amount of each curing agent is determined according to the method applied in the current industry: taking a certain amount of the just-prepared modified urea-formaldehyde resin adhesive (the molar ratio of formaldehyde to urea is 1.2:1), adding the modified urea-formaldehyde resin adhesive into a colorless and transparent plastic bottle, adding a certain amount of a curing agent, and uniformly stirring. Heating in a water bath at 100 ℃, and recording the time period from the start of the water bath at 100 ℃ to the whitening of the urea-formaldehyde resin gel adhesive, wherein the time period is called as curing time period and reflects the curing capacity of the curing agent. The addition amount and the curing time of the curing agents No. 1-8 are determined through multiple experiments and analysis and are shown in Table 2.
TABLE 2 amount of curing agent added
Note that: in order to balance the contradiction between curing and latency, the amount of the curing agent added is preferably an amount of the curing agent added for a curing period of 8 to 9 minutes.
Example 2
Determination of latency effects
Preparing a batch of modified urea-formaldehyde resin adhesive with the molar ratio of formaldehyde to urea of 1.2:1, weighing a plurality of parts of adhesive with the mass of 250-300g (the adhesive amount of table 2 is not in the range), respectively adding curing agents according to the adding amount of the curing agents of table 2, pouring into a colorless and transparent plastic bottle, and shaking uniformly. After numbering, the mixture is put into a water bath at 40 ℃, a camera is started at the same time, and the time length of the urea-formaldehyde resin gel adhesive becoming white is recorded. The test results are shown in Table 3.
TABLE 3 test of latency effect
As can be seen from Table 3, the curing agent of the present invention was added to prolong the room temperature latency significantly compared with the curing agent used at present, while ensuring the curing ability. The result shows that the curing agent of the invention solves the problem that the curing effect is mutually interfered when the existing curing agent urea-formaldehyde resin adhesive is used for impregnating paper, and the paper is stored and pressed.
Claims (3)
1. The application of Tris buffer as curing agent in the preparation of urea-formaldehyde resin adhesive impregnated paper is characterized in that the application method comprises the following steps: when preparing urea-formaldehyde resin adhesive impregnated paper, adding Tris buffer serving as a curing agent into the prepared urea-formaldehyde resin adhesive, and uniformly stirring;
the Tris buffer has pH buffering performance at normal temperature;
The specific preparation method of the Tris buffer comprises the following steps: mixing a tris (hydroxymethyl) aminomethane aqueous solution with acid, and regulating the pH value to 7.0-8.0;
The addition amount of the Tris buffer serving as a curing agent is 0.19-0.26% of the mass of the urea-formaldehyde resin adhesive.
2. The use of Tris buffer according to claim 1 as a curing agent in the preparation of urea-formaldehyde resin adhesive impregnated paper, wherein the acid used for formulating Tris buffer is one or a mixture of nitric acid, sulfuric acid, p-toluenesulfonic acid.
3. The use of Tris buffer according to claim 1 as a curing agent in the preparation of urea-formaldehyde resin adhesive impregnated paper, wherein the concentration of Tris buffer as a curing agent is 35% -39%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310032130.2A CN116145461B (en) | 2023-01-10 | 2023-01-10 | Application of Tris buffer as curing agent in preparation of urea-formaldehyde resin adhesive impregnated paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310032130.2A CN116145461B (en) | 2023-01-10 | 2023-01-10 | Application of Tris buffer as curing agent in preparation of urea-formaldehyde resin adhesive impregnated paper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116145461A CN116145461A (en) | 2023-05-23 |
| CN116145461B true CN116145461B (en) | 2024-05-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310032130.2A Active CN116145461B (en) | 2023-01-10 | 2023-01-10 | Application of Tris buffer as curing agent in preparation of urea-formaldehyde resin adhesive impregnated paper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116145461B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB893825A (en) * | 1959-05-25 | 1962-04-11 | Formica Int | Decorative laminates |
| US3033823A (en) * | 1957-11-12 | 1962-05-08 | Formica Corp | Resinous compositions and process of preparing same |
| CN101260185A (en) * | 2008-02-26 | 2008-09-10 | 上海大学 | Low-temperature incubation type epoxide resin curing agent and preparing method thereof |
| WO2016182259A1 (en) * | 2015-05-08 | 2016-11-17 | 주식회사 케이씨씨 | Powder coating latent curing agent, and epoxy powder coating composition containing same |
| CN108004840A (en) * | 2017-12-27 | 2018-05-08 | 山东圣泉新材料股份有限公司 | A kind of quick-setting automobile filter paper |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6569918B2 (en) * | 2000-02-04 | 2003-05-27 | Plastics Engineering Company | Polymer composition for curing novolac resins |
| US20120015176A1 (en) * | 2008-03-24 | 2012-01-19 | Riebel Michael J | Biolaminate composite assembly and related method |
-
2023
- 2023-01-10 CN CN202310032130.2A patent/CN116145461B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3033823A (en) * | 1957-11-12 | 1962-05-08 | Formica Corp | Resinous compositions and process of preparing same |
| GB893825A (en) * | 1959-05-25 | 1962-04-11 | Formica Int | Decorative laminates |
| CN101260185A (en) * | 2008-02-26 | 2008-09-10 | 上海大学 | Low-temperature incubation type epoxide resin curing agent and preparing method thereof |
| WO2016182259A1 (en) * | 2015-05-08 | 2016-11-17 | 주식회사 케이씨씨 | Powder coating latent curing agent, and epoxy powder coating composition containing same |
| CN108004840A (en) * | 2017-12-27 | 2018-05-08 | 山东圣泉新材料股份有限公司 | A kind of quick-setting automobile filter paper |
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| Publication number | Publication date |
|---|---|
| CN116145461A (en) | 2023-05-23 |
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