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Low formaldehyde melamine resin and its application

A melamine resin and low-formaldehyde technology, applied in the field of melamine resin, can solve the problems of polyurethane foam with strong odor, high energy consumption, and long production cycle of melamine resin

Active Publication Date: 2022-03-08
JIANGSU CHANGNENG ENERGY SAVING NEW MATERIALS SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent CN106046285A discloses a production method of melamine series polyols, which is prepared by reacting melamine and paraformaldehyde under alkaline conditions to obtain methylol melamine, and then etherifying it with a multi-component alcohol mixture under acidic conditions. The method of melamine resin solves the problems of long production cycle, high energy consumption and low equipment production efficiency of melamine resin in the prior art, but the content of free formaldehyde in the melamine resin prepared by it is high, and it is used for polyurethane foaming. Polyurethane foam obtained during foaming has a problem of strong odor

Method used

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  • Low formaldehyde melamine resin and its application
  • Low formaldehyde melamine resin and its application
  • Low formaldehyde melamine resin and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1. low formaldehyde type melamine resin, its preparation method comprises the following steps:

[0030] (1) Add 1 mol of hexamethylol melamine, 7.5 mol of methanol, 1.5 mol of propylene glycol and 0.5 mol of polyether polyol CHE-204 into the reactor to form material I;

[0031] (2) Under stirring conditions, when the temperature reaches 65°C, add a methanol solution of p-toluenesulfonic acid with a mass percentage of 31.5% to the material I, adjust the pH value of the system to 3.5, and obtain the material II;

[0032] (3) Material II is reacted under normal pressure, the reaction temperature is 90° C., and the reaction time is 2 hours, then triethanolamine is added to adjust the pH value of the system to 8 to form material III;

[0033] (4) Add 0.07mol of urea to material III, and mix uniformly to obtain material IV;

[0034] (5) Carrying out vacuum distillation on material IV to separate small molecular substances in the system, the vacuum distillation temperature is...

Embodiment 2～6

[0046]Embodiment 2~6 is carried out according to each step in embodiment 1, difference is that reaction raw material, raw material ratio, reaction time, reaction temperature, acid solution, lye, and the adjusted pH value are different, see Table 2 specifically; The obtained low-formaldehyde melamine resin was added to the foaming formula of the polyurethane foam according to the mass fraction in Table 1 for foaming, and the performance index data of the prepared polyurethane foam are shown in Table 4.

Embodiment 1～6

[0047] Table 2 The number of moles of raw materials and reaction conditions in the preparation of low-formaldehyde melamine resins in Examples 1 to 6

[0048]

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Abstract

The invention relates to a low-formaldehyde melamine resin and its application, which mainly solves the problem that the free formaldehyde content in the melamine resin in the prior art is high, and the polyurethane foam obtained when it is used for polyurethane foaming has a large odor. A low-formaldehyde melamine resin is provided, the preparation method of which comprises the following steps: (1) mixing hexamethylol melamine, methanol, multi-component alcohol and polyether polyol in a molar ratio of 1:6-9:1-2 : 0.1~1 add reaction vessel; (2) add acid solution to adjust pH value; (3) react under normal pressure, then add lye to adjust pH value; (4) add formaldehyde capture agent, formaldehyde capture agent and (1) The molar ratio of hexamethylolmelamine is 0.01~0.1:1; (5) Distillation under reduced pressure; (6) Moisture monitoring until the moisture mass percentage is ≤0.5%, to obtain a low formaldehyde free formaldehyde mass percentage ≤0.1% The technical scheme of type melamine resin and its application solves this problem well, and can be used in the industrial application of polyurethane foam products.

Description

technical field [0001] The invention relates to the field of melamine resins, in particular to a low-formaldehyde melamine resin and its application. Background technique [0002] With the continuous development of the national economy, the application fields of melamine resin continue to expand, and the amount of use continues to increase. At the same time, with the improvement of people's environmental protection awareness, the impact of free formaldehyde in melamine resin on human health has attracted more and more attention. Formaldehyde is a kind of gas, also known as formic aldehyde. It is a colorless gas at normal temperature and has a special smell. Its aqueous solution is what we often call formalin, which is a commonly used preservative. Formaldehyde ranks second on the priority list of toxic chemicals in my country, and was listed as the first class of carcinogens by the International Agency for Research on Cancer (IARC) in 2004. It is a carcinogenic and teratogen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/42C08G18/54C08G18/48C08J9/14C08L75/08
Inventor 李少杰朱益林施剑峰赵俊飞孙江
Owner JIANGSU CHANGNENG ENERGY SAVING NEW MATERIALS SCI & TECH
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