CN1405258A - Adhensive special for fiber product from straw and preparation process thereof - Google Patents
Adhensive special for fiber product from straw and preparation process thereof Download PDFInfo
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- CN1405258A CN1405258A CN 02137657 CN02137657A CN1405258A CN 1405258 A CN1405258 A CN 1405258A CN 02137657 CN02137657 CN 02137657 CN 02137657 A CN02137657 A CN 02137657A CN 1405258 A CN1405258 A CN 1405258A
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Abstract
A kind of adhesive special used in straw fibre product, its character lies in its ingredients and the proportion are: carbamide and formaldehyde is 1.5-1.69, and adds in 8-15% tripoly-cyanogens amine and 1.0-1.2% poval. The manufacturing craft includes: formalhyde is added into reactor which has a refluence device, blending and heating, and adds tripoly-cyanogens amine and poval, when the temperature rises up to 60 degree C and the materials are all dissolved, the Ph value is adjusted to 7.5-8.3 inputs the first batch of carbamide about 75%, it is heated up to 88-90 degree C, maintains the temperature, reacts for 0.5-1.0 hours, then the Ph value is adjusted to 4.8-5.1, reacts for 1.5-1.7 hours, adds the second batch of carbamide about 25%, adjusts the pH value to 7.0-7.5, reacts for 0.5-0.7 hours, finally it is dehydrated to the needed thickness and cooled, then the adhesive is obtained.
Description
Technical field
The present invention relates to the special-purpose adhesive and the preparation technology thereof of a kind of tackiness agent, particularly a kind of fiber product from straw.
Background technology
The stalk in rural area is often gone back the field by the peasant by burning owing to there are not good recycling means, has not only caused serious atmospheric pollution, and has wasted this degradable natural resources.In fact, if, can become the substitute of timber, be with a wide range of applications after crushed stalk, gluing, the compression.Yet, do not have suitable stalk fibre tackiness agent at present, the existing tackiness agent that is used for firewood, shaving board etc. that mostly is, though it is various in style, but and be not suitable for stalk fibre, and poor water resistance mostly, processing condition harshness in the use (big, solidification value is high) as pressure.
Summary of the invention
Technical problem to be solved by this invention is special-purpose adhesive and the preparation technology thereof that a kind of fiber product from straw is provided at above-mentioned prior art present situation.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: the raw material of the special-purpose adhesive of this fiber product from straw and proportioning are: the weight ratio of urea and formaldehyde is 1.50～1.69, and is added with trimeric cyanamide of both gross weights 8～15% and 1.0～1.2% polyvinyl alcohol.
Its preparation technology is: add formaldehyde in the reactor of reflux is arranged, warming while stirring, add trimeric cyanamide simultaneously, polyvinyl alcohol, treat that temperature rises to 60 ℃, after material is molten entirely, pH value is transferred to 7.5～8.3, add first urea of urea total amount 75% thereupon, be warming up to 88～90 ℃, keep temperature, reacted 0.5～1.0 hour, and changed then and transfer pH value to 4.8～5.1, sustained reaction 1.5～1.7 hours, the second batch of urea that thereupon adds urea total amount 25%, transfer pH value to 7.0～7.5 gradually, continue reaction 0.5～0.7 hour, carry out dewatering operation at last to desired concn, cooling, plastic emitting.
Compared with prior art, tackiness agent of the present invention extremely is suitable for the straw kind vegetable fibre, makes it to be utilized effectively, and to the pollution of air, and has saved a large amount of timber when only having stopped the farmland crop straw burning; And the present invention adopts compound prescription, and residual product degradable rate is brought up to more than 80%, exempted plastics and damaged and abandon the environmental pollution that is caused; Especially production mild conditionization: pressure is reduced to 1.5～3.0MPa by 25～30MPa, and the forming and hardening temperature is reduced to 80～100 ℃ by 140～160 ℃; Characteristics such as that resultant articles has simultaneously is water-fast, high strength, low cost.
Description of drawings
(nothing)
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Embodiment one:
Get formaldehyde (can select 37% commercial grade for use) 100Kg, urea (can select 98% purity for use) 60.6Kg, trimeric cyanamide 11.6Kg, polyvinyl alcohol 1.5Kg;
In the reactor of reflux is arranged, add formaldehyde, trimeric cyanamide and polyvinyl alcohol, start and stir and return channel, heat up, when treating that temperature rises to 60 ℃, add first urea 45.45Kg.Because the reason of reaction heat and outer heating, the still temperature raises rapidly, in this process, adjust pH to 7.5～8.3 when still temperature rise to 90 ℃, pull back to 4.8～5.1 gradually with the pH value, sustained reaction 1.5 hours adds second crowd of urea 15.15Kg thereupon, again adjust pH to 7.0～7.5 gradually, reacted again 40 minutes, starting vacuum system at last, is to carry out dewatering operation, constantly sampling analysis measuring product viscosity under the 0.065MPa in vacuum tightness, when viscosity reaches 0.20～0.22PaS, stop dehydration; Cooling goes out product glue under 40 ℃.
Use present embodiment finished product bonding stalk fibre, be suitable for making the goods of conveying tray class.
Embodiment two:
Get formaldehyde 100Kg, urea 58Kg, trimeric cyanamide 8Kg, polyvinyl alcohol 1Kg;
Concrete synthetic manufacturing processed is with embodiment one, wherein urea first feed intake and be 43.5Kg, second batch feeds intake and is 14.5Kg.
Use present embodiment finished product bonding stalk fibre, be suitable for making the small package vanning.
Embodiment three:
Get formaldehyde 100Kg, urea 65Kg, trimeric cyanamide 10.5Kg, polyvinyl alcohol 0.8～1.0Kg;
Concrete synthetic manufacturing processed is with embodiment one, wherein urea first feed intake and be 49Kg, second batch feeds intake and is 16Kg; In addition, the synthesis temperature that adds first urea allows to bring up to 92 ℃, to shorten the operating time; And, behind the one-tenth glue, can not dewater directly discharging.
Use present embodiment finished product bonding stalk fibre, be suitable for making the sheet material of auxiliary panelling or similar shaving board type.
Claims (2)
1, a kind of special-purpose adhesive of fiber product from straw, it is characterized in that its raw material and proportioning are: the weight ratio of urea and formaldehyde is 1.50～1.69, and is added with trimeric cyanamide of both gross weights 8～15% and 1.0～1.2% polyvinyl alcohol.
2, a kind of preparation technology who prepares the special-purpose adhesive of fiber product from straw as claimed in claim 1, it is characterized in that may further comprise the steps: in the reactor of reflux is arranged, add formaldehyde, warming while stirring, add trimeric cyanamide simultaneously, polyvinyl alcohol, treat that temperature rises to 60 ℃, after material is molten entirely, pH value is transferred to 7.5～8.3, first urea that thereupon adds urea total amount 75%, be warming up to 88～90 ℃, keeping temperature, reacting 0.5～1.0 hour, change then and transfer pH value to 4.8～5.1, sustained reaction 1.5～1.7 hours adds second batch of urea of urea total amount 25% thereupon, transfers pH value to 7.0～7.5 gradually, continue reaction 0.5～0.7 hour, carry out dewatering operation at last to desired concn, cooling, plastic emitting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02137657 CN1405258A (en) | 2002-10-25 | 2002-10-25 | Adhensive special for fiber product from straw and preparation process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02137657 CN1405258A (en) | 2002-10-25 | 2002-10-25 | Adhensive special for fiber product from straw and preparation process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1405258A true CN1405258A (en) | 2003-03-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02137657 Pending CN1405258A (en) | 2002-10-25 | 2002-10-25 | Adhensive special for fiber product from straw and preparation process thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN1405258A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100475905C (en) * | 2005-05-20 | 2009-04-08 | 中国石油天然气股份有限公司 | Process for preparing urea-formaldehyde resin additive, preparation method and uses |
-
2002
- 2002-10-25 CN CN 02137657 patent/CN1405258A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100475905C (en) * | 2005-05-20 | 2009-04-08 | 中国石油天然气股份有限公司 | Process for preparing urea-formaldehyde resin additive, preparation method and uses |
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