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Methanal eliminating agent, plaster slab with function of eliminating methanal and preparation thereof

A formaldehyde elimination agent and gypsum board technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as poor effect, limited amount of formaldehyde elimination, high price, etc., and achieve simple and rapid formaldehyde elimination in the production process , Eliminate the effect of good effect

Inactive Publication Date: 2008-08-20
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the products currently on the market and patented technology products have the problems of high price and poor effect. The amount of formaldehyde eliminated in a certain period of time is limited, and the persistence of the effect is poor. Usually, the validity period is only a few days, and there are two times. contamination defect
For example, the formaldehyde scavenger disclosed in the patent application literature with the publication number CN1404891A is expensive because of the use of hydrazide compounds; a formaldehyde scavenger is disclosed in the invention patent application literature with the publication number CN1526470A, and its effect is not very satisfactory. , the elimination rate of formaldehyde is only 78%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of formaldehyde scavenger:

[0035] 1) Prepare raw materials according to the following weight ratio:

[0036] Distilled water 569kg

[0037] Phosphoric acid (concentration 85%) 80kg

[0038] Citric acid 20kg

[0039] Urea 240kg

[0040] Melamine 30kg

[0041] Ammonium chloride 30kg

[0042] Ammonium sulfate 20kg

[0043] Sodium chloride 20kg

[0044] Polyvinyl alcohol (1799) 6kg

[0045] Acetyl ethyl acetate 0.6kg

[0046] 2) Add all the phosphoric acid, citric acid, urea and melamine in the above raw materials into a reactor filled with 50% of the total amount of distilled water, stir and mix evenly, heat up to 95°C, and react until the pH of the material=6.0- 7.0;

[0047] 3) Keep the temperature at 95°C and add polyvinyl alcohol (1799), stir until completely dissolved;

[0048] 4) Cool down to 50-55°C, add the remaining distilled water and all the ammonium chloride, ammonium sulfate and sodium chloride, and keep warm for 30-40 minutes;

...

Embodiment 2

[0059] (1) Preparation of formaldehyde scavenger:

[0060] 1) Prepare raw materials according to the following weight ratio:

[0061] Deionized water 500kg

[0062] Phosphoric acid (concentration 85%) 20kg

[0063] Formic acid (concentration 85%) 2kg

[0064] Urea 150kg

[0065] Dicyandiamide 50kg

[0066] Ammonium phosphate 10kg

[0067] Ammonium acetate 10kg

[0068] Potassium chloride 10kg

[0069] Polyvinyl alcohol (2099) 20kg

[0070] Acetyl ethyl acetate 5kg

[0071] 2) Add all the phosphoric acid, formic acid, urea and dicyandiamide in the above raw materials into a reactor filled with 50% of the total amount of deionized water, stir and mix evenly, heat up to 90°C, and react to the pH of the material =6.0-7.0;

[0072] 3) Keep the temperature at 90°C and add polyvinyl alcohol, stir until completely dissolved;

[0073] 4) Cool down to 45-50°C, add the remaining deionized water and all ammonium phosphate, ammonium acetate and potassium chloride, and keep warm ...

Embodiment 3

[0084] (1) Preparation of formaldehyde scavenger:

[0085] 1) Prepare raw materials according to the following weight ratio:

[0086] Well water 650kg

[0087] Acetic acid (concentration (95%) 150kg

[0088] Formic acid (concentration 85%) 10kg

[0089] Urea 350kg

[0090] Dicyandiamide 30kg

[0091] Ammonium phosphate 80kg

[0092] Polyvinyl alcohol (1799) 10kg

[0093] Acetyl ethyl acetate 2.5kg

[0094] 2) Add all the acetic acid, formic acid, urea and dicyandiamide in the above raw materials into the reactor equipped with 50% of the total amount of well water, stir and mix evenly, heat up to 105 ° C, and react until the pH of the material = 6.0-7.0;

[0095] 3) Keep the temperature at 105°C and add polyvinyl alcohol, stir until completely dissolved;

[0096] 4) Cool down to 50-55°C, add the remaining well water and all the ammonium phosphate, and keep warm for 30-40 minutes;

[0097] 5) Cool down to below 30°C, add all the acetyl ethyl acetate, stir for 5-10 minu...

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PUM

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Abstract

The invention provides a formaldehyde eliminator and a plaster board with formaldehyde elimination and the preparation method. The formaldehyde eliminator comprises the following weight proportion material: 500 to 650 share dispersed medium, 20 to 160 share acid compounds, 100 to 400 share multi-amine compounds, 10 to 80 salt compounds, 5 to 20 share polyvinyl alcohols, and 0.1 to 5 share acetic acid acetyl acetic esters. The formaldehyde eliminating preparation has the advantages of low cost, simple production technology and convenient use. The plaster board with formaldehyde elimination not only provides with formaldehyde elimination, but also do not influence the other properties of the plaster board and provides with the virtue of formaldehyde eliminating in the environment rapidly and the eliminating effect is good and long lasting.

Description

technical field [0001] The invention relates to a preparation for eliminating harmful chemical substances, a board with eliminating harmful chemical substances and a preparation method thereof, in particular to a preparation for eliminating formaldehyde for gypsum boards, a gypsum board containing the preparation and a preparation method thereof. Background technique [0002] With the continuous improvement of people's living standards, decoration and purchase of new furniture have become common things in people's lives. Various types of wood-based panels are often used in decoration and furniture manufacturing, such as plywood, blockboard, medium-density fiberboard, particle board, etc., and most of these wood-based panels are made of formaldehyde-based adhesives, mainly urea-formaldehyde resin adhesives. Release problem, often become the main source of formaldehyde pollution in indoor air. Moreover, although the formaldehyde emission of these wood-based panels will gradua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/72C04B41/50
Inventor 李建章周文瑞董金宝张世锋赵金平
Owner BEIJING FORESTRY UNIVERSITY
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