CN102827338B - Production method of environment-friendly formaldehyde-free plywood glue - Google Patents
Production method of environment-friendly formaldehyde-free plywood glue Download PDFInfo
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Abstract
The invention relates to a production method of environment-friendly formaldehyde-free plywood glue, which comprises the following steps: respectively weighing formaldehyde and urea in a mol ratio of 1:1.1-1:1.02, and adding urea for the first time; after finishing keeping the temperature, adding urea for the second time; when the solution viscosity reaches 5000mPa.s, adding urea for the third time, and carrying out vacuum dehydration for more than 120 minutes; after finishing dehydration, adding urea for the fourth time; and after carrying out dissolution reaction for 30 minutes, cooling to 38-42 DEG C, regulating the pH value to 7.8-8.5, and discharging the glue, thereby obtaining the environment-friendly formaldehyde-free plywood glue product. The proportional and fractional addition of urea and the low mol ratio ensure the environment friendliness of the glue; the invention has the advantages of simple and reasonable technique, low manufacturing cost, no gelation or tank spraying in the production process, and high production safety and stability; the storage period of the glue is more than 90 days; the glue can be stored, used and transported in both hot summer and cold winter; and the formaldehyde release of the artificial board produced from the environment-friendly E0-Grade glue product is E0<=3mg/100g.
Description
Technical field
The invention belongs to the environment-friendly type macromolecule new material technology field, relate to a kind of production method of environment friendly aldehyde-free glued board glue.
Background technology
China implemented " indoor decorating and refurnishing materials wood-based plate and the goods thereof formaldehyde discharge limit the quantity of " compulsory standard from 1 day January in 2002, the burst size of methanal of wood-based plate has been proposed Secretary.
At present in the world, be divided into E2, E1, three ranks of E0 according to the burst size of methanal grade, be E2≤30mg/100g, E1≤9mg/100g, E0≤3mg/100g, the E0 level refers to that the amount that contains formaldehyde in every 100g sample is less than or equal to 3mg, generally be to take boring method to measure, only have in the world at present Finland and Japan to carry out similar E0 standard, the family product that meets this standard is international top environmentfriendly products.
The production of E0 level high standard sheet material, all very high to the technology and equipment requirement of producer.At present, the most domestic medium-sized and small enterprises all also do not possess such throughput.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art
,The invention provides a kind of technique advantages of simple, cost of manufacture is cheap, can improve the production method of the environment friendly aldehyde-free glued board glue of the environmental-protecting performance of wood-based panel product and quality product.
The technical solution adopted for the present invention to solve the technical problems is: a kind of production method of environment friendly aldehyde-free glued board glue, and its processing step is:
The first step: take by weighing respectively formaldehyde and urea according to mol ratio 1:1.1～1.02, add polyvinyl alcohol in formaldehyde, the polyvinyl alcohol that adds and the weight ratio of formaldehyde are 1:140～150, and reaction is also stirred more than 10 minutes and added alkali, transfers between pH=8.5～9.0;
Second step: after the first step is processed, add for the first time urea, urea the first time add-on and the weight ratio of formaldehyde be 1:3.5～3.8, and add simultaneously properties-correcting agent, add properties-correcting agent and urea the first time add-on weight ratio be 1:30～35, open steam and be warmed up to 88～92 ℃, then close steam insulation more than 40 minutes, make the pH value of solution between 6.5～7.0;
The 3rd step: after insulation finishes, transfer the pH value 6.0 of solution, again after 30 minutes, transfer the pH value 5.1～5.3 of solution, add trimeric cyanamide, the trimeric cyanamide that adds and urea the first time add-on weight ratio be 1:17～22, after 90～100 minutes, measure the viscosity of solution; When soltion viscosity reaches 3000mPas, add for the second time urea, and add simultaneously trimeric cyanamide and auxiliary agent, the weight that second time of urea adds be urea the first time add-on 80～90%, the weight of the trimeric cyanamide that adds for the second time be for the second time the urea add-on 5.5～6.5%, the weight that adds for the first time auxiliary agent be the second time urea add-on 1.5～2%; When soltion viscosity reaches 5000mPas, add for the third time urea, and add simultaneously auxiliary agent, for the third time the urea add-on be for the first time the urea add-on 35～40%, the weight that adds for the second time auxiliary agent is 3～4 % of urea add-on for the third time, through stirring more than 10 minutes, regulator solution pH value is 8.0～8.5 again;
The 4th step: the solution after processing through the 3rd step carried out the vacuum hydro-extraction processing more than 120 minutes, and when soltion viscosity reached 6000mPas, the water with 20 ℃ of temperature carried out cooling process 80～100 seconds again;
The 5th step: after dehydration finishes, add urea the 4th time, the weight that adds urea for the 4th time be urea the first time add-on 43～47 %, through solubilizing reaction after 30 minutes, cool to 38～42 ℃, put glue behind the adjust pH 7.8～8.5, make environment friendly aldehyde-free plywood glue fishery products.
Positively effect of the present invention is: add and hang down mol ratio according to the proportioning gradation of urea, guaranteed the feature of environmental protection of glue, the technique advantages of simple, cost of manufacture is cheap, can not cause gel in the production process, more can spray cans, production safety is stable, shelf lives is more than 90 days, can deposit in the dog days of summer and the dead of winter, use, transportation, this glue is zero through national environmental protection product quality supervision and inspection Spot detection free formaldehyde, adopt the burst size of methanal E0≤3mg/100g of the wood-based plate that environment-friendly type E0 level glue product of the present invention produces, improved environmental-protecting performance and the quality product of wood-based panel product.
Embodiment
The present invention is further described below in conjunction with embodiment.
A kind of production method of a kind of environment friendly aldehyde-free glued board of production method glue of environment friendly aldehyde-free glued board glue, its processing step is:
The first step: take by weighing respectively formaldehyde and urea according to mol ratio 1:1.1～1.02, add polyvinyl alcohol in formaldehyde, the polyvinyl alcohol that adds and the weight ratio of formaldehyde are 1:140～150, and reaction is also stirred more than 10 minutes and added alkali, transfers between pH=8.5～9.0;
Second step: after the first step is processed, add for the first time urea, urea the first time add-on and the weight ratio of formaldehyde be 1:3.5～3.8, and add simultaneously properties-correcting agent, add properties-correcting agent and urea the first time add-on weight ratio be 1:30～35, open steam and be warmed up to 88～92 ℃, then close steam insulation more than 40 minutes, make the pH value of solution between 6.5～7.0;
The 3rd step: after insulation finishes, transfer the pH value 6.0 of solution, again after 30 minutes, transfer the pH value 5.1～5.3 of solution, add trimeric cyanamide, the trimeric cyanamide that adds and urea the first time add-on weight ratio be 1:17～22, after 90～100 minutes, measure the viscosity of solution; When soltion viscosity reaches 3000mPas, add for the second time urea, and add simultaneously trimeric cyanamide and auxiliary agent, the weight that second time of urea adds be urea the first time add-on 80～90%, the weight of the trimeric cyanamide that adds for the second time be for the second time the urea add-on 5.5～6.5%, the weight that adds for the second time auxiliary agent be the second time urea add-on 1.5～2%; When soltion viscosity reaches 5000mPas, add for the third time urea, and add simultaneously auxiliary agent, for the third time the urea add-on be for the first time the urea add-on 35～40%, the weight that adds for the third time auxiliary agent is 3～4 % of urea add-on for the third time, through stirring more than 10 minutes, regulator solution pH value is 8.0～8.5 again;
The 4th step: the solution after processing through the 3rd step carried out the vacuum hydro-extraction processing more than 120 minutes, and when soltion viscosity reached 6000mPas, the water with 20 ℃ of temperature carried out cooling process 80～100 seconds again;
The 5th step: after dehydration finishes, add urea the 4th time, the weight that adds urea for the 4th time be urea the first time add-on 43～47 %, through solubilizing reaction after 30 minutes, cool to 38～42 ℃, put glue behind the adjust pH 7.8～8.5, make environment friendly aldehyde-free plywood glue fishery products.
Add and hang down mol ratio according to the proportioning gradation of urea, guaranteed the feature of environmental protection of glue, the technique advantages of simple, cost of manufacture is cheap, adopt the burst size of methanal E0≤3mg/100g of the wood-based plate that environment-friendly type E0 level glue product of the present invention produces, improved environmental-protecting performance and the quality product of wood-based panel product.
Embodiment 1:
Select raw material formaldehyde and urea, their mol ratio is 1:1.02, take by weighing formaldehyde 17285kg, urea 12750kg, auxiliary agent 135kg, properties-correcting agent 300kg, trimeric cyanamide 400kg, polyvinyl alcohol 120kg, in reactor, drop into formaldehyde 17285kg, add polyvinyl alcohol 120kg, react after 10 minutes, and stirring adds adjusting PH with base value 8.5～9.0; For the first time add urea 4750kg in the reactor, add properties-correcting agent 150kg, after opening steam and being warmed up to 90 ℃, the steam off insulation was surveyed the pH value between 6.5～7.0 after 60 minutes; After soaking time has arrived, adjust pH to 6.0, adjust pH 5.1～5.3 after 30 minutes, add trimeric cyanamide 250kg, after 90～100 minutes, measure the viscosity of solution; When soltion viscosity reaches 3000mPas, add auxiliary agent 70kg, add again trimeric cyanamide 250kg, add urea 4050kg for the second time; When soltion viscosity reaches 5000mPas, add again auxiliary agent 65kg, add for the third time urea 1800kg, stir after 10 minutes adjust pH 8.0～8.5; Then carry out vacuum hydro-extraction, vacuum hydro-extraction is after 120 minutes, and when soltion viscosity reached 6000mPas, the water with 20 ℃ of temperature carried out cooling process 80～100 seconds again; After vacuum hydro-extraction finishes, the 4th adding urea 2150kg, solubilizing reaction cooled to 40 ℃ after 30 minutes, and adjust pH 7.8～8.5 is put glue, makes environment friendly aldehyde-free plywood glue fishery products.
Can not cause in the production process of the present invention gel, more can not spray cans, production safety is stable, the shelf lives can be deposited, use, transport in the dog days of summer and the dead of winter more than 90 days, this glue is zero through national environmental protection product quality supervision and inspection Spot detection free formaldehyde.
Claims (1)
1. the production method of an environment friendly aldehyde-free glued board glue is characterized in that processing step is:
The first step: take by weighing respectively formaldehyde and urea according to mol ratio 1:1.1～1.02, add polyvinyl alcohol in formaldehyde, the polyvinyl alcohol that adds and the weight ratio of formaldehyde are 1:140～150, and reaction is also stirred more than 10 minutes and added alkali, transfers between pH=8.5～9.0;
Second step: after the first step is processed, add for the first time urea, urea the first time add-on and the weight ratio of formaldehyde be 1:3.5～3.8, and add simultaneously properties-correcting agent, add properties-correcting agent and urea the first time add-on weight ratio be 1:30～35, open steam and be warmed up to 88～92 ℃, then close steam insulation more than 40 minutes, make the pH value of solution between 6.5～7.0;
The 3rd step: after insulation finishes, transfer the pH value 6.0 of solution, again after 30 minutes, transfer the pH value 5.1～5.3 of solution, add trimeric cyanamide, the trimeric cyanamide that adds and urea the first time add-on weight ratio be 1:17～22, after 90～100 minutes, measure the viscosity of solution; When soltion viscosity reaches 3000mPas, add for the second time urea, and add simultaneously trimeric cyanamide and auxiliary agent, the weight that second time of urea adds be urea the first time add-on 80～90%, the weight of the trimeric cyanamide that adds for the second time be for the second time the urea add-on 5.5～6.5%, the weight that adds for the first time auxiliary agent be the second time urea add-on 1.5～2%; When soltion viscosity reaches 5000mPas, add for the third time urea, and add simultaneously auxiliary agent, for the third time the urea add-on be for the first time the urea add-on 35～40%, the weight that adds for the second time auxiliary agent is 3～4 % of urea add-on for the third time, through stirring more than 10 minutes, regulator solution pH value is 8.0～8.5 again;
The 4th step: the solution after processing through the 3rd step carried out the vacuum hydro-extraction processing more than 120 minutes, and when soltion viscosity reached 6000mPas, the water with 20 ℃ of temperature carried out cooling process 80～100 seconds again;
The 5th step: after dehydration finishes, add urea the 4th time, the weight that adds urea for the 4th time be urea the first time add-on 43～47 %, through solubilizing reaction after 30 minutes, cool to 38～42 ℃, put glue behind the adjust pH 7.8～8.5, make environment friendly aldehyde-free plywood glue fishery products.
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| CN103087661B (en) * | 2012-12-21 | 2014-11-12 | 淮南市金海达树脂有限责任公司 | Adhesive for bamboo and wood products and preparation method thereof |
| CN103756609A (en) * | 2013-12-25 | 2014-04-30 | 广西宾阳县荣良新材料科技有限公司 | Plywood glue and preparation method thereof |
| CN105348465B (en) * | 2015-12-04 | 2017-09-26 | 广西南宁德源胶粘剂有限公司 | A kind of preparation method of E0 grades of cyanurotriamide modified urea resin |
| CN106381108A (en) * | 2016-08-31 | 2017-02-08 | 广西玉麒木业股份有限公司 | Environment-friendly glue for sheet material and preparation method thereof |
| CN110105881A (en) * | 2019-05-24 | 2019-08-09 | 福建善诚木业科技有限公司 | A kind of novel glue applied to glued board |
| CN110434954A (en) * | 2019-08-31 | 2019-11-12 | 广东始兴县华洲木业有限公司 | A kind of preparation process of zero formaldehyde light granules plate |
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| CN101063028A (en) * | 2006-04-29 | 2007-10-31 | 山东贺友集团有限公司 | Production method for environment-friendly type middle-density board glue |
| CN101381589A (en) * | 2008-10-14 | 2009-03-11 | 曾任河 | Super low poison lignum urea-formaldehyde resin adhesive and preparation method thereof |
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Denomination of invention: Production method of environment-friendly formaldehyde-free plywood glue Effective date of registration: 20151105 Granted publication date: 20130918 Pledgee: Guangzhou auspicious Finance Leasing Co., Ltd. Pledgor: Guangdong Shixing Huazhou Wood Industry Co., Ltd. Registration number: 2015440000021 |
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Date of cancellation: 20200617 Granted publication date: 20130918 Pledgee: Guangzhou auspicious Finance Leasing Co., Ltd. Pledgor: GUANGDONG SHIXING HUAZHOU WOOD INDUSTRY Co.,Ltd. Registration number: 2015440000021 |
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Denomination of invention: A production method of environmental friendly formaldehyde free plywood glue Effective date of registration: 20210423 Granted publication date: 20130918 Pledgee: China Co. truction Bank Corp Guangzhou Yuexiu branch Pledgor: GUANGDONG SHIXING HUAZHOU WOOD INDUSTRY Co.,Ltd. Registration number: Y2021440000147 |
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