CN110894272B - Synthesis process of melamine resin for long-storage-period impregnation - Google Patents
Synthesis process of melamine resin for long-storage-period impregnation Download PDFInfo
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- 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
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/40—Chemically modified polycondensates
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- 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
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C08G12/30—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with substituted triazines
- C08G12/32—Melamines
-
- 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
- D21H17/47—Condensation polymers of aldehydes or ketones
- D21H17/49—Condensation polymers of aldehydes or ketones with compounds containing hydrogen bound to nitrogen
- D21H17/51—Triazines, e.g. melamine
-
- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
-
- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/143—Agents preventing ageing of paper, e.g. radiation absorbing substances
-
- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
Abstract
The invention belongs to the technical field of polymer material synthesis, and relates to a synthesis process of melamine resin for long-storage-period impregnation, which comprises the steps of pumping formaldehyde and water into a reaction kettle, uniformly stirring, adding alkali liquor to adjust the pH value, slowly adding a modifier when the pH value is 9.0-9.5, and starting to heat; rapidly adding melamine and stirring when the temperature is raised to 40 ℃; heating to 87-93 ℃ within 20-30 min, carrying out heat preservation reaction for 25-35 min, and controlling the pH value of a glue solution system to be 8.5-9.5 in the polycondensation process; and (3) the temperature of the glue solution system is 87-93 ℃, when the water solubility multiple reaches 240-260%, the temperature is reduced, the glue solution is cooled to 40 ℃ within 30-60 min, and sampling and discharging are carried out. The process disclosed by the invention is reasonable in design and easy to operate, the prepared impregnating resin is high in water solubility, good in stability and low in cost, and the storage period can reach 10-15 days. The invention improves the pollution resistance, water resistance and ageing resistance of the product, and improves the stability and water solubility of the impregnating resin, thereby reducing the generation of waste glue and reducing the pollution to the environment.
Description
Technical Field
The invention belongs to the technical field of polymer material synthesis, and relates to a synthesis process of melamine resin for long-storage-life impregnation.
Background
The melamine has a main chain ring structure with stable chemical properties and high rigidity, and can form a transparent product with high wear resistance, water resistance, organic solvent resistance, dilute acid resistance and dilute alkali resistance after curing and crosslinking. These properties make melamine resin an excellent material for making veneered wood-based panels and plywood paper-based wood grain films.
The melamine resin and the urea-formaldehyde resin are commonly used in the impregnated bond paper industry, wherein the melamine resin becomes the most common impregnated resin with the most extensive application in the market at present due to the higher cost performance. Decorative paper and surface paper produced by melamine resin impregnation can be used for veneering of shaving boards and density boards; it can also be used in decorative laminates for surfaces requiring good chemical, mechanical and hygienic resistance, such as kitchens, laboratories, hospitals, etc.
At present, the main problems faced by the melamine resin for impregnation are poor water solubility, poor stability and short storage period of the impregnation liquid, the impregnation liquid can be solidified and whitened generally within about 5-7 days and cannot be used continuously, and the problems make the production and the use of the glue liquid difficult to operate independently.
Patent CN 108997545 a discloses a preparation process of an impregnated melamine resin, which adopts diethylene glycol and caprolactam to modify the melamine resin to synthesize the impregnated resin with low formaldehyde emission, wherein the storage life of the resin is prolonged to a certain extent, but the addition of the modifier causes the preparation cost to be too high.
Therefore, the method has important practical significance on solving the problems of poor water solubility, poor stability, short storage time and the like on the premise of ensuring the performance of the melamine resin for impregnation.
Disclosure of Invention
Aiming at the defects of poor water solubility, poor stability and the like of the impregnated melamine resin, the invention aims to provide a synthesis process of the impregnated resin with high solid content, low cost and long storage period so as to prolong the storage period of the impregnated melamine resin and solve the problems of poor water solubility and poor stability.
In order to achieve the purpose, the invention mainly introduces hydrophilic groups or closed hydroxymethyl groups on the molecular structure of the resin by adding a modifier to prevent the further progress of the polycondensation reaction of the system, thereby improving the crosslinking degree, the water solubility and the stability of the resin.
The invention is realized by the following technical scheme:
a synthesis process of melamine resin for long-storage-period impregnation comprises the following steps:
(1) adding formaldehyde and water into a reaction kettle, stirring uniformly, adding alkali liquor to adjust the pH value, slowly adding a modifier when the pH value is 9.0-9.5, and starting to heat up, wherein the adding amount of the modifier is 3% -5% of the total glue amount;
(2) heating to 40 ℃, quickly adding melamine, stirring for 10min, fully dissolving the melamine in a mixed solution of formaldehyde, water and a modifier, and continuously heating, wherein the molar ratio of the melamine to the formaldehyde is 1: 1.7-2.0;
(3) heating to 87-93 ℃ within 20-30 min, carrying out heat preservation reaction for 25-35 min, preferably heating to 90 ℃ and carrying out heat preservation for 30min, wherein the solution becomes clear from turbidity, the hydroxymethyl melamine in the solution generates a polycondensation reaction under the action of a modifier to generate a large amount of network structures, and the pH value of a glue solution system is controlled to be 8.5-9.5 in the polycondensation process;
(4) the temperature of a glue solution system is controlled to be 87-93 ℃ all the time, when the solution is clear and transparent, the water solubility times are measured, then the detection is carried out once every 10min, when the water solubility times reach 240-260%, the temperature is reduced, the water solubility times are detected once every 10min in the temperature reduction process, and the temperature reduction speed is adjusted;
(5) and cooling the glue solution to 40 ℃ within 30-60 min, sampling, and discharging to obtain the melamine resin for long-storage-period impregnation.
In a more preferred embodiment of the invention, the modifier in the step (1) is prepared by compounding 1, 4-butanediol, propylene glycol and triethanolamine, wherein the addition amount of the 1, 4-butanediol is 40% -60% of the total addition amount of the modifier, the addition amount of the propylene glycol is 20% -30% of the total addition amount of the modifier, and the addition amount of the triethanolamine is 20% -30% of the total addition amount of the modifier.
In a better disclosed example of the invention, the alkali liquor in the step (1) is sodium hydroxide or potassium hydroxide with the mass concentration of 20-30%.
In the preferred embodiment of the invention, the water turbidity multiple of the synthetic glue solution during the final discharging in the step (5) is 160-190%.
In the preferred embodiment of the invention, the solid content of the long-storage-period melamine resin for dipping synthesized in the final discharging step (5) is 58-63%, the pH value is 9.0-9.6, the viscosity is 18-25 s, and the storage period is about 10-15 d.
The methylol melamine is a monomer of melamine resin generated by the addition reaction of formaldehyde and melamine under the alkaline condition when the temperature reaches 70-80 ℃. When the temperature is continuously increased to 80-90 ℃, the methylol melamine generates polycondensation reaction under the action of the modifier to generate initial polycondensate with a net structure. The temperature is raised to 90 ℃ within 20-30 min. The initial polycondensate is further polycondensed to further deepen the reaction, and finally, the melamine resin for long-storage-period impregnation, which is insoluble and infusible polycondensate, is formed. And continuously detecting the water solubility multiple in the cooling process, controlling the cooling speed, and adjusting the resin reaction rate to ensure that the water solubility multiple of the final synthetic resin is 160-190%.
The formaldehyde used in the invention is 37% industrial formaldehyde aqueous solution, the melamine is industrial melamine, and the effective component is not less than 99.8%.
Advantageous effects
The process disclosed by the invention is reasonable and simple in design and easy to operate. The impregnating resin produced by the process has high water solubility, good stability and lower preparation cost, and the storage period can reach 10-15 days. The invention makes the production of the dipping melamine resin more convenient; the prepared melamine resin has high crosslinking degree, improves the pollution resistance, water resistance and ageing resistance of the product, and improves the stability and water solubility of the impregnating resin, thereby reducing the generation of waste glue and reducing the pollution to the environment; saving cost and increasing economic benefit. By adopting the impregnating resin impregnated decorative paper, the surface paper and the balance paper, the appearance and the physical and chemical properties of the produced impregnated paper laminated wood floor meet the requirements of GB 18102-2007.
Detailed Description
The present invention will be described in detail below with reference to examples to enable those skilled in the art to better understand the present invention, but the present invention is not limited to the following examples.
Example 1
A synthesis process of melamine resin for long-storage-period impregnation comprises the following steps:
(1) adding a certain amount of formaldehyde and water into a reaction kettle, stirring, adding alkali to adjust the pH value to 9.3, slowly adding a certain amount of modifier, stirring and heating; the addition of the modifier is 5 percent of the total glue amount.
(2) Heating to 40 ℃, quickly adding melamine, stirring for 10min to fully dissolve the melamine in a mixed solution of formaldehyde, water and a modifier, and continuously heating, wherein the molar ratio of the melamine to the formaldehyde is 1: 1.8;
(3) controlling the temperature to rise to 90 ℃ within 20-30 min, carrying out heat preservation reaction for 30min, clarifying the solution from turbidity, carrying out polycondensation on the methylol melamine in the solution under the action of a modifier to generate a large number of network structures, and controlling the pH value of a glue solution system to be 9.0 in the polycondensation process;
(4) the temperature of the solution is controlled to be about 90 ℃ all the time, when the solution is clear and transparent, the water solubility times are measured, then the detection is carried out once every 10min, when the water solubility times reach 240%, the temperature is reduced, the water solubility times are detected once every 10min in the temperature reduction process, and the temperature reduction speed is adjusted;
(5) and (4) controlling the temperature of the glue solution to be cooled to 40 ℃ within 30-60 min, sampling, and discharging to obtain the glue solution.
Wherein:
the modifier in the step (1) is prepared by compounding 1, 4-butanediol, propylene glycol and triethanolamine. Wherein the adding amount of the 1, 4-butanediol is 40 percent of the total adding amount of the modifier, the adding amount of the propylene glycol is 30 percent of the total adding amount of the modifier, and the adding amount of the triethanolamine is 30 percent of the total adding amount of the modifier. The addition amount of the modifier is 5 percent of the total glue amount.
The alkali in the step (1) is sodium hydroxide with the mass concentration of 30%.
And (5) the water turbidity multiple of the synthetic glue solution during final discharging is 160%.
The melamine resin for long-storage-period impregnation, which is synthesized in the final discharging in the step (5), has the solid content of 62 percent, the pH value of 9.3, the viscosity of 22s and the storage period of about 14 d.
Example 2
A synthesis process of melamine resin for long-storage-period impregnation comprises the following steps:
(1) adding a certain amount of formaldehyde and water into a reaction kettle, stirring, adding alkali to adjust the pH value to 9.4, slowly adding a certain amount of modifier, stirring and heating; the addition of the modifier is 4% of the total glue amount.
(2) Heating to 40 ℃, quickly adding melamine, stirring for 10min to fully dissolve the melamine in a mixed solution of formaldehyde, water and a modifier, and continuously heating, wherein the molar ratio of the melamine to the formaldehyde is 1: 1.75;
(3) controlling the temperature to rise to 90 ℃ within 20-30 min, carrying out heat preservation reaction for 30min, enabling the solution to become clear from turbidity, carrying out polycondensation on the hydroxymethyl melamine in the solution under the action of a modifier to generate a large number of net-shaped structures, and controlling the pH value of a glue solution system to be 9.3 in the polycondensation process;
(4) the temperature of the solution is always controlled to be about 90 ℃, when the solution is clear and transparent, the water solubility times are measured, then the detection is carried out every 10min, when the water solubility times reach 260 percent, the temperature is reduced, the water solubility times are detected every 10min in the temperature reduction process, and the temperature reduction speed is adjusted;
(5) and (4) controlling the temperature of the glue solution to be cooled to 40 ℃ within 30-60 min, sampling, and discharging to obtain the glue solution.
Wherein:
the modifier in the step (1) is prepared by compounding 1, 4-butanediol, propylene glycol and triethanolamine. Wherein the adding amount of the 1, 4-butanediol is 60 percent of the total adding amount of the modifier, the adding amount of the propylene glycol is 20 percent of the total adding amount of the modifier, and the adding amount of the triethanolamine is 20 percent of the total adding amount of the modifier. The addition of the modifier is 4% of the total glue amount.
The alkali in the step (1) is potassium hydroxide with the mass concentration of 30%.
And (5) the water turbidity multiple of the synthetic glue solution during final discharging is 180%.
The solid content of the melamine resin for long-storage-period impregnation synthesized in the final discharging in the step (5) is 61%, the pH value is 9.5, the viscosity is 21s, and the storage period is about 13 d.
Example 3
A synthesis process of melamine resin for long-storage-period impregnation comprises the following steps:
(1) adding a certain amount of formaldehyde and water into a reaction kettle, stirring, adding alkali to adjust the pH value to 9.3, slowly adding a certain amount of modifier, stirring and heating; the addition amount of the modifier is 5 percent of the total glue amount.
(2) Heating to 40 ℃, quickly adding melamine, stirring for 10min to fully dissolve the melamine in a mixed solution of formaldehyde, water and a modifier, and continuously heating, wherein the molar ratio of the melamine to the formaldehyde is 1: 2.0;
(3) controlling the temperature to rise to 90 ℃ within 20-30 min, carrying out heat preservation reaction for 30min, clarifying the solution from turbidity, carrying out polycondensation on the methylol melamine in the solution under the action of a modifier to generate a large number of network structures, and controlling the pH value of a glue solution system to be 9.2 in the polycondensation process;
(4) the temperature of the solution is always controlled to be about 90 ℃, when the solution is clear and transparent, the water solubility multiple is measured, then the detection is carried out every 10min, when the water solubility multiple reaches 250 percent, the temperature is reduced, the water solubility multiple is detected every 10min in the temperature reduction process, and the temperature reduction speed is adjusted;
(5) and controlling the glue solution to be cooled to 40 ℃ within 30-60 min, sampling, and discharging to obtain the glue.
Wherein:
the modifier in the step (1) is prepared by compounding 1, 4-butanediol, propylene glycol and triethanolamine. Wherein the addition amount of the 1, 4-butanediol is 50 percent of the total addition amount of the modifier, the addition amount of the propylene glycol is 20 percent of the total addition amount of the modifier, and the addition amount of the triethanolamine is 30 percent of the total addition amount of the modifier. Fully mixing 1, 4-butanediol, propylene glycol and triethanolamine according to the proportion to prepare a modifier for later use. The addition of the modifier is 5 percent of the total glue amount.
The alkali in the step (1) is sodium hydroxide with the mass concentration of 20%.
And (5) during the final discharging, the water turbidity multiple of the synthetic glue solution is 170%.
The melamine resin for long-storage-period impregnation, which is synthesized in the final discharging in the step (5), has the solid content of 62 percent, the pH value of 9.2, the viscosity of 21s and the storage period of about 14 d.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications, equivalents, flow charts, and other related technical fields that are made by the present invention will be included in the scope of the present invention.
Claims (6)
1. A synthesis process of melamine resin for long-storage-period impregnation is characterized by comprising the following steps:
(1) adding formaldehyde and water into a reaction kettle, stirring uniformly, adding alkali liquor to adjust the pH value, slowly adding a modifier when the pH value is 9.0-9.5, and starting to heat up, wherein the adding amount of the modifier is 3% -5% of the total glue amount; the modifier is prepared by compounding 1, 4-butanediol, propylene glycol and triethanolamine, wherein the addition amount of the 1, 4-butanediol is 40-60% of the total addition amount of the modifier, the addition amount of the propylene glycol is 20-30% of the total addition amount of the modifier, and the addition amount of the triethanolamine is 10-40% of the total addition amount of the modifier;
(2) heating to 40 ℃, quickly adding melamine, stirring for 10min, fully dissolving the melamine in a mixed solution of formaldehyde, water and a modifier, and continuously heating, wherein the molar ratio of the melamine to the formaldehyde is 1: 1.7-2.0;
(3) heating to 87-93 ℃ within 20-30 min, carrying out heat preservation reaction for 25-35 min, clarifying the solution from turbidity, carrying out polycondensation reaction on the hydroxymethyl melamine in the solution under the action of a modifier to generate a large number of network structures, and controlling the pH value of a glue solution system to be 8.5-9.5 in the polycondensation process;
(4) the temperature of a glue solution system is controlled to be 87-93 ℃ all the time, when the solution is clear and transparent, the water solubility times are measured, then the detection is carried out once every 10min, when the water solubility times reach 240-260%, the temperature is reduced, the water solubility times are detected once every 10min in the temperature reduction process, and the temperature reduction speed is adjusted;
(5) and cooling the glue solution to 40 ℃ within 30-60 min, sampling, and discharging to obtain the glue.
2. The process for the synthesis of melamine resin for long pot life impregnation according to claim 1, characterized in that: the alkali liquor in the step (1) is sodium hydroxide or potassium hydroxide with the mass concentration of 20-30%.
3. The process for the synthesis of melamine resins for long-pot impregnation according to claim 1, characterized in that: and (3) heating to 90 ℃ within 20-30 min, and preserving heat for 30 min.
4. The process for the synthesis of melamine resin for long pot life impregnation according to claim 1, characterized in that: and (5) during discharging, the water turbidity multiple of the synthetic glue solution is 160-190%.
5. A melamine resin for long-pot-life impregnation obtainable by the synthesis process according to any one of claims 1 to 4.
6. The long pot life melamine resin for impregnation according to claim 5, wherein: the solid content is 58-63%, the pH value is 9.0-9.6, the viscosity is 18-25 s, and the storage period is about 10-15 d.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB809662A (en) * | 1955-06-06 | 1959-02-25 | Monsanto Canada Ltd | Stable solutions of water-soluble amino-aldehyde resins |
| US3458465A (en) * | 1965-03-25 | 1969-07-29 | Henkel & Cie Gmbh | Laminate,binding solution and process for preparation of laminate |
| EP0077067A1 (en) * | 1981-10-14 | 1983-04-20 | CASSELLA Aktiengesellschaft | Aqueous melamine formaldehyde resin solutions and a method for their preparation |
| US4454277A (en) * | 1980-12-22 | 1984-06-12 | Chemie Linz Aktiengesellschaft | Preparations of storage-stable aqueous solutions of melamine-formaldehyde resins |
| CN102675575A (en) * | 2012-04-28 | 2012-09-19 | 南通紫鑫实业有限公司 | Preparation method of melamine formaldehyde resin for foam |
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2019
- 2019-11-04 CN CN201911065416.0A patent/CN110894272B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB809662A (en) * | 1955-06-06 | 1959-02-25 | Monsanto Canada Ltd | Stable solutions of water-soluble amino-aldehyde resins |
| US3458465A (en) * | 1965-03-25 | 1969-07-29 | Henkel & Cie Gmbh | Laminate,binding solution and process for preparation of laminate |
| US4454277A (en) * | 1980-12-22 | 1984-06-12 | Chemie Linz Aktiengesellschaft | Preparations of storage-stable aqueous solutions of melamine-formaldehyde resins |
| EP0077067A1 (en) * | 1981-10-14 | 1983-04-20 | CASSELLA Aktiengesellschaft | Aqueous melamine formaldehyde resin solutions and a method for their preparation |
| CN102675575A (en) * | 2012-04-28 | 2012-09-19 | 南通紫鑫实业有限公司 | Preparation method of melamine formaldehyde resin for foam |
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| 三聚氰胺甲醛浸渍树脂的改性研究;韩书广等;《木材工业》;20090731;第23卷(第04期);12-15 * |
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Effective date of registration: 20200508 Address after: Zhenjiang city Jiangsu Road on the north side of the 212310 big city of Danyang province Danyang Development Zone Applicant after: DARE WOOD BASED PANEL GROUP Co.,Ltd. Applicant after: REINFORCEMENT FLOOR BRANCH OF DARE WOOD BASED PANEL GROUP Co.,Ltd. Address before: Dare wood garden 212310 Zhenjiang city of Jiangsu Province, Danyang City Economic and Technological Development Zone Applicant before: SHENGXIANG INDUSTRIAL (JIANGSU) Co.,Ltd. |
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Effective date of registration: 20220725 Address after: 212310 Daya Wood Industry Park, Danyang Economic Development Zone, Zhenjiang City, Jiangsu Province Applicant after: SHENGXIANG INDUSTRIAL (JIANGSU) Co.,Ltd. Applicant after: DARE WOOD BASED PANEL GROUP Co.,Ltd. Applicant after: REINFORCEMENT FLOOR BRANCH OF DARE WOOD BASED PANEL GROUP Co.,Ltd. Address before: 212310 the northern side of Daya South Road, Danyang Development Zone, Danyang City, Zhenjiang City, Jiangsu, China Applicant before: DARE WOOD BASED PANEL GROUP Co.,Ltd. Applicant before: REINFORCEMENT FLOOR BRANCH OF DARE WOOD BASED PANEL GROUP Co.,Ltd. |
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