Aldehyde-free plate

A technology for board and particle board, applied in the field of formaldehyde-free board, can solve the problems of high cost and complicated preparation process, and achieve the effects of low cost, simple production process and good water solubility

Active Publication Date: 2020-04-03

SHANDONG UNIV OF SCI & TECH

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AI-Extracted Technical Summary

Problems solved by technology

Although the existing inventions propose a variety of new adhesives, the preparation process is relat...

Abstract

The invention provides an aldehyde-free plate. The aldehyde-free plate contains a manganese dioxide catalyst, and a preparing method of the manganese dioxide catalyst comprises the steps of dissolvinga raw material in water and performing a heating reaction to obtain the manganese dioxide catalyst. The raw material comprises potassium permanganate, manganese sulfate and a reducing agent. A bonding agent used by the aldehyde-free plate is urea formaldehyde type bonding agent. The aldehyde-free plate is aldehyde-free, environment-friendly, low in cost, simple in manufacturing process, and capable of effectively preventing or reducing releasing of f ormaldehyde in the bonding agent to the indoor environment.

Application Domain

Dispersed particle separationWood veneer joining +3

Technology Topic

Potassium permanganateManganese sulphate +4

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Examples

Experimental program(5)
Comparison scheme(5)

Example Embodiment

[0040] Example 1

[0041] Manganese dioxide catalyst preparation

[0042] Weigh 1.57g KMnO 4 , 1.69g MnSO 4 ·H 2 O and 0.23 g of glucose were dissolved in 150 ml of deionized water, mixed thoroughly, and reacted in a water bath at 70° C. for 7 hours. After the reaction was completed, 35 mL of deionized water was added to dilute to obtain a manganese dioxide catalyst slurry. Alternatively, the reaction product is directly filtered and dried at 60°C to obtain a powder catalyst.

[0043] Wood-based panel coating

[0044] The single-layer board according to the catalyst coating amount 0.004g/cm 2 The manganese dioxide catalyst slurry is coated, and the plywood is formed by hot pressing, the pressing temperature is 150° C., the pressure is 5 MPa, and the hot pressing time is 4 min. The surface layer of the plywood is in accordance with the catalyst coating amount 0.005g/cm 2 Coating the above-mentioned manganese dioxide catalyst slurry. Air-dried at 70°C to obtain formaldehyde-free plywood. Put the plywood into a vacuum dryer and record the concentration of formaldehyde and carbon dioxide in the dryer. See Table 1 for specific data.

[0045] Take the wood chips and the above manganese dioxide catalyst powder, the manganese dioxide catalyst addition amount is 0.001g/cm 3 Mix well and add urea-formaldehyde adhesive to make particle board. The surface layer of the particleboard is in accordance with the coating amount of the manganese dioxide catalyst 0.005g/cm 2 Coating the above-mentioned manganese dioxide catalyst slurry. Air-dried at 70°C to obtain aldehyde-free particleboard. Put the particleboard into a vacuum dryer, and record the concentration of formaldehyde and carbon dioxide in the dryer. See Table 2 for specific data.

Example Embodiment

[0046] Example 2

[0047] Manganese dioxide catalyst preparation

[0048] Weigh 1.57g KMnO 4 , 2.01g MnSO 4 ·H 2 O and 0.15 g of glucose were dissolved in 130 ml of deionized water, mixed thoroughly, and reacted in a water bath at 60° C. for 6 hours. After the reaction, 40 mL of deionized water was added to dilute to obtain a manganese dioxide catalyst slurry. Alternatively, the reaction product is directly filtered and dried at 60°C to obtain a powder catalyst.

[0049] Wood-based panel coating

[0050] The single-layer board according to the catalyst coating amount 0.004g/cm 2 The manganese dioxide catalyst slurry is coated, and urea-formaldehyde adhesive is added to form a plywood by hot pressing. The pressing temperature is 160° C., the pressure is 6 MPa, and the hot pressing time is 4.5 min. The surface layer of the plywood is in accordance with the catalyst coating amount 0.005g/cm 2 Coating the above-mentioned manganese dioxide catalyst slurry. Air-dried at 70°C to obtain formaldehyde-free plywood. Put the plywood into a vacuum dryer and record the concentration of formaldehyde and carbon dioxide in the dryer. See Table 1 for specific data.

[0051] Take the wood chips and the above-mentioned manganese dioxide catalyst powder, the addition amount of manganese dioxide catalyst is 0.0010g/cm 3 Mix well and add urea-formaldehyde adhesive to make particle board. The surface layer of the particleboard is in accordance with the coating amount of the manganese dioxide catalyst 0.005g/cm 2 Coating the above-mentioned manganese dioxide catalyst slurry. Air-dried at 70°C to obtain aldehyde-free particleboard. Put the particleboard into a vacuum dryer, and record the concentration of formaldehyde and carbon dioxide in the dryer. See Table 2 for specific data.

Example Embodiment

[0052] Example 3

[0053] Manganese dioxide catalyst preparation

[0054] Weigh 1.57g KMnO 4 , 1.82g MnSO 4 ·H 2 O and 0.21g of citric acid were dissolved in 130ml of deionized water, mixed thoroughly, and reacted in a water bath at 80°C for 9h. After the reaction, 40ml of deionized water was added to dilute to obtain a manganese dioxide catalyst slurry. Alternatively, the reaction product is directly filtered and dried at 60°C to obtain a powder catalyst.

[0055] Wood-based panel coating

[0056] The single-layer board according to the catalyst coating amount 0.006g/cm 2 The manganese dioxide catalyst slurry is coated, and urea-formaldehyde adhesive is added to form a plywood by hot pressing. The pressing temperature is 155° C., the pressure is 7 MPa, and the hot pressing time is 4.5 min. The surface layer of the plywood is in accordance with the catalyst coating amount 0.007g/cm 2 Coating the above-mentioned manganese dioxide catalyst slurry. Air-dried at 70°C to obtain formaldehyde-free plywood. Put the plywood into a vacuum dryer and record the concentration of formaldehyde and carbon dioxide in the dryer. See Table 1 for specific data.

[0057] Take the wood chips and the above-mentioned manganese dioxide catalyst slurry, the manganese dioxide catalyst addition amount is 0.0010g/cm 3 Mix well and add aldehyde urea adhesive to make particle board. The surface layer of the particleboard is in accordance with the coating amount of the manganese dioxide catalyst 0.005g/cm 2 Coating the above-mentioned manganese dioxide catalyst slurry. Air-dried at 70°C to obtain aldehyde-free particleboard. Put the particleboard into a vacuum dryer, and record the concentration of formaldehyde and carbon dioxide in the dryer. See Table 2 for specific data.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Ensure environmental safety
Good water solubility

Aldehyde-free plate

A technology for board and particle board, applied in the field of formaldehyde-free board, can solve the problems of high cost and complicated preparation process, and achieve the effects of low cost, simple production process and good water solubility

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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