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Increment agent for urea-formaldehyde resin, preparing method thereof and urea-formaldehyde resin adhesive

A technology of urea-formaldehyde resin and extender, which is applied in the field of urea-formaldehyde resin glue and extender of urea-formaldehyde resin, which can solve the problems such as the decrease of bond strength between particleboard and fiberboard and wood-based panels, and reduce the molar ratio of urea-formaldehyde resin, etc., and achieve physical Improvement of mechanical properties, improvement of internal bonding strength, and reduction of formaldehyde emission

Inactive Publication Date: 2011-02-02
EVERFIRST WISEFUND TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the additive contains a large amount of urea, its mechanism of eliminating formaldehyde is equivalent to reducing the molar ratio of the urea-formaldehyde resin, thus reducing the bonding strength of the wood-based panel; at the same time, the additive contains a large amount of cellulose, which will increase the Viscosity, so not suitable for the production of particleboard and fiberboard

Method used

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  • Increment agent for urea-formaldehyde resin, preparing method thereof and urea-formaldehyde resin adhesive
  • Increment agent for urea-formaldehyde resin, preparing method thereof and urea-formaldehyde resin adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Prepare raw materials according to the following weight ratio:

[0025] Formaldehyde (concentration 37%): 200kg

[0026] Urea: 150kg

[0027] Wheat flour: 100kg

[0028] Sodium phosphate: 0.2kg

[0029] Borax: 2kg

[0030] Water: 500kg

[0031] Sodium hydroxide solution (concentration is 30%): appropriate amount

[0032] 2. Add formaldehyde to the reaction kettle, start stirring, adjust the pH value to 6.5-7.0 with sodium hydroxide solution, add water and stir;

[0033] 3. Add wheat flour and sodium phosphate, stir until all are miscible, control the temperature at 20-25°C, measure the pH value, and control the pH value at 7.5-8.0 with sodium hydroxide solution;

[0034] 4. Add borax, control pH=8.5-9.0, temperature at 20-25°C, and react for 12 minutes;

[0035] 5. Add urea, stir until completely dissolved, control the temperature at 20±2°C, and control the pH at 8.0-8.5 with sodium hydroxide solution;

[0036] 6. Transfer the finished product to an aging tan...

Embodiment 2

[0046] Carry out raw material preparation according to the following weight ratio:

[0047] Formaldehyde (concentration 37%): 200kg

[0048] Urea: 150kg

[0049] Wheat flour: 120kg

[0050] Sodium phosphate: 0.3kg

[0051] Borax: 2kg

[0052] Water: 230kg

[0053] Sodium hydroxide solution (concentration is 30%): appropriate amount

[0054] In addition to step 2), the pH value is adjusted to 5.0-5.5 with sodium hydroxide solution; the temperature in step 3) is 15-20 ° C, and the pH is 6.0-6.5; the pH in step 4) is 8.0-8.5, and the temperature is 15 -20°C, the reaction time is 15 minutes; the temperature control in step 5) is 10±2°C, and the pH is 7.0-8.8; except that the pH in step 6) is 7.0-8.8, the rest are the same as in Example 1.

[0055] Product technical indicators:

[0056] Solid content 40-50%

[0057] Viscosity (Tu-4 cups) 15-18 (25°C, S),

[0058] pH 7.0-8.8

[0059] Density 1.10-1.20g / cm 3

[0060] Storage period ≥60 days

Embodiment 3

[0062] Carry out raw material preparation according to the following weight ratio:

[0063] Formaldehyde (concentration 37%): 200kg

[0064] Urea: 200kg

[0065] Calcium carbonate: 100kg

[0066] Sodium metaphosphate: 0.5kg

[0067] Acrylamide: 0.5kg

[0068] Water: 300kg

[0069] Sodium hydroxide solution (concentration is 30%): appropriate amount

[0070] Formic acid solution (concentration is 30%): appropriate amount

[0071] In addition to step 2), use formic acid solution to adjust the pH value to 3.5-4.0; the temperature in step 3) is 25-30 ° C, and the pH is 5.0-5.5; the pH in step 4) is 7.0-7.5, and the temperature is 25-30 ℃, the reaction time is 10 minutes, except that the pH is 8.0-8.8 in step 5) and step 6), the rest are the same as in Example 1.

[0072] Product technical indicators:

[0073] Solid content 40-50%

[0074] Viscosity (Tu-4 cups) 15-18 (25°C, S),

[0075] pH 8.0-8.8

[0076] Density 1.10-1.20g / cm 3

[0077] Storage period ≥60 days

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Abstract

The invention discloses a urea-formaldehyde resin incremental agent and making method, which comprises the following parts: 200g formaldehyde, 100-300g aquacare, 100-250g filler, 0.1-5g dispersant, 0.1-5g stabilizer, 150-700g water and fitful pH value allocating acid solution and alkaline solution. The manufacturing course compress the following steps: adding formaldehyde into autoclave; stirring; adjusting pH value to 3.5-7.0; adding water to stir; adding filler and dispersant; stirring until dissolving completely; controlling temperature between 15 and 30 deg.c and pH value at 5.0-8.0; adding stabilizer; controlling pH value at 7.0-9.0 and temperature at 15-30 deg.c to react 10-15 min; adding aquacare to stir; controlling temperature at 5-25 deg.c; adjusting pH value to 7.0-9.0; aging the product in the aging tank with pH value at 7.0-9.0.

Description

technical field [0001] The invention relates to an extender for urea-formaldehyde resin, its preparation method and urea-formaldehyde resin glue, in particular to an extender for urea-formaldehyde resin used in the production of wood-based panels, its preparation method and urea-formaldehyde resin glue. Background technique [0002] Over the past 30 years of reform and opening up, my country's wood industry has achieved extraordinary rapid development. In 2005, the total output of my country's wood-based panels (fiberboard, particleboard and plywood) was 63.93 million cubic meters, which was 26 times that of 1990. my country has risen to become the world's largest producer of wood-based panels. The world's largest producer of urea-formaldehyde resin. At the same time, due to the rapid development of wood-based panels, especially high-density fiberboard (HDF) and medium-density fiberboard (MDF), the wood industry has been subjected to multiple market competition pressures in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J11/08C09J161/24
Inventor 雷得定周雄志李建章
Owner EVERFIRST WISEFUND TECH BEIJING
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