阅读说明：本技术 一种三聚氰胺改性树脂胶的制备工艺 (Preparation process of melamine modified resin adhesive ) 是由 马冬青 于 2021-10-11 设计创作，主要内容包括：本发明涉及一种三聚氰胺改性树脂胶的制备工艺,所述一种三聚氰胺改性树脂胶由以下重量份的原料组成：甲醛40-60份、水20-30份、尿素20-30份、三聚氰胺3-5份、聚乙烯醇5-6份、次氯酸3-8份、氢氧化钠3-4份、有机溶剂2-4份、稳定剂2-4份、乳化剂3-5份,具有如下优点：加入三聚氰胺能够有效减小树脂胶成品的脆性、使由其制成的成品更加耐水、不易老化,使用寿命更长,耐久性更好,且具有良好的稳定性,在加入有机溶剂的同时又加入了乳化剂,使各种原材料能够很好的进行融合,确保制出的三聚氰胺改性树脂胶品质较好,制作过程中沉淀物较少,材料利用率较高。(The invention relates to a preparation process of a melamine modified resin adhesive, which comprises the following raw materials in parts by weight: 40-60 parts of formaldehyde, 20-30 parts of water, 20-30 parts of urea, 3-5 parts of melamine, 5-6 parts of polyvinyl alcohol, 3-8 parts of hypochlorous acid, 3-4 parts of sodium hydroxide, 2-4 parts of organic solvent, 2-4 parts of stabilizer and 3-5 parts of emulsifier, and has the following advantages: the addition of the melamine can effectively reduce the brittleness of the resin adhesive finished product, so that the finished product prepared from the resin adhesive is more water-resistant and difficult to age, has longer service life, better durability and good stability, and the addition of the emulsifier while the addition of the organic solvent enables various raw materials to be well fused, thereby ensuring that the prepared melamine modified resin adhesive has better quality, less precipitate in the preparation process and higher material utilization rate.)

1. A preparation process of melamine modified resin adhesive is characterized by comprising the following steps: the melamine modified resin adhesive is prepared from the following raw materials in parts by weight: 40-60 parts of formaldehyde, 20-30 parts of water, 20-30 parts of urea, 3-5 parts of melamine, 5-6 parts of polyvinyl alcohol, 3-8 parts of hypochlorous acid, 3-4 parts of sodium hydroxide, 2-4 parts of organic solvent, 2-4 parts of stabilizer and 3-5 parts of emulsifier.

2. The process for preparing melamine modified resin adhesive according to claim 1, wherein: the organic solvent is one or a combination of ethyl acetate, acetone, formic acid, acetic acid and ethanol.

3. The process of claim 1, wherein the melamine modified resin adhesive comprises: the stabilizer is one or more of hydroquinone, p-benzoquinone, di-tert-butyl-p-cresol, benzoquinone, naphthoquinone, EDTA-4Na salt, EDTA-2Na salt, methoxyphenol, anthraquinone, stearic acid, p-hydroxyanisole and tetramethylpiperidine oxide.

4. The process of claim 1, wherein the melamine modified resin adhesive comprises: the emulsifier is one or more of diphenyl ethyl complex phenol polyoxyethylene ether, diglycerol polypropylene glycol ether, benzyl dimethyl phenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether phosphate and sodium dipentyl succinate.

5. The process for preparing melamine modified resin adhesive according to claims 1-4, wherein: the preparation method comprises the following preparation steps:

the method comprises the following steps: preparing a steam heating device, a water cooling device and a reaction kettle;

step two: weighing formaldehyde, water, urea, melamine, polyvinyl alcohol, hypochlorous acid, sodium hydroxide, an organic solvent, a stabilizer and an emulsifier according to a ratio;

step three: preparing a sodium hydroxide solution and a formaldehyde diluent, putting the prepared formaldehyde diluent into a reaction kettle, adding an organic solvent, heating the reaction kettle to 50-60 ℃, simultaneously adding a sodium hydroxide solution with the mass concentration of 25-35% to adjust the pH value in the reaction kettle to 8-9, then adding urea and melamine, wherein the adding amount of the urea is 40% of the total amount, then heating the reaction kettle to 60-80 ℃, and stirring for 30-40 min;

step four: adding urea, aniline, polyvinyl alcohol and a stabilizer into a reaction kettle, simultaneously adding hypochlorous acid to adjust the pH value in the reaction kettle to 6-7, heating the reaction kettle to 80-90 ℃, stirring for 10-15min, and preserving heat for 1 hour;

step five: cooling the reaction kettle by water, adding the rest urea, the stabilizer and the emulsifier into the reaction kettle when the temperature of the reaction kettle is reduced to 60-70 ℃, adding a sodium hydroxide solution with the mass concentration of 30-40% to adjust the pH value in the reaction kettle to 7-8, heating the reaction kettle to 75-85 ℃, and preserving the temperature for 5-10 min;

step six: and cooling the reaction kettle to 30-40 ℃, then adjusting the pH value in the reaction kettle to 8-8.5, stirring for 20-40min, and discharging to obtain the melamine modified resin adhesive.

Technical Field

The invention relates to the field of preparation of technical modified resin adhesives, in particular to a preparation process of a melamine modified resin adhesive.

Background

Melamine is commonly called melamine, protamine and melamine, is a triazine nitrogen-containing heterocyclic ring organic compound, is non-combustible and has stable property at normal temperature. Aqueous solutions are weakly alkaline (pH 8) and form melamine salts with hydrochloric acid, sulfuric acid, nitric acid, acetic acid, oxalic acid, and the like. Under neutral or slightly alkaline condition, the formaldehyde and the formaldehyde are condensed to form various methylol melamines, but the methylol derivatives are subjected to polycondensation reaction in slightly acidic condition (pH value is 5.5-6.5) to form resin products. When the cyanuric acid is hydrolyzed by strong acid or strong alkali aqueous solution, amino is gradually replaced by hydroxyl, ammeline is firstly generated, ammelide is further generated by hydrolysis, and ammelic acid is finally generated and used as a chemical raw material. It is a white monoclinic crystal, almost tasteless, and slightly soluble in water. Melamine is a trimer of cyanamide, and a large amount of nitrogen is released when a resin prepared from the melamine is heated and decomposed, so that the melamine can be used as a flame retardant, a water reducing agent and the like. It is not used for food processing or food additives because it is harmful to human body. Because traditional resin has shrink big, the fragility is big, not water-fast, easy ageing scheduling problem, consequently need carry out modification treatment to it when preparing the resin glue among the prior art, handle the resin glue through melamine for the resin glue performance after the modification promotes greatly.

Disclosure of Invention

The technical problem to be solved by the invention is to provide the melamine modified resin adhesive with stable chemical properties.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: a preparation process of a melamine modified resin adhesive comprises the following raw materials in parts by weight: 40-60 parts of formaldehyde, 20-30 parts of water, 20-30 parts of urea, 3-4 parts of melamine, 5-6 parts of polyvinyl alcohol, 3-8 parts of hypochlorous acid, 3-4 parts of sodium hydroxide, 2-4 parts of an organic solvent, 2-4 parts of a stabilizer and 3-5 parts of an emulsifier.

As an improvement, the organic solvent is one or a combination of more of ethyl acetate, acetone, formic acid, acetic acid and ethanol, and can effectively dissolve the preparation raw materials.

As an improvement, the stabilizer is one or a combination of more of hydroquinone, p-benzoquinone, di-tert-butyl-p-cresol, benzoquinone, naphthoquinone, EDTA-4Na salt, EDTA-2Na salt, methoxyphenol, anthraquinone, stearic acid, p-hydroxyanisole and tetramethylpiperidine oxide, so that the chemical property of a finished product is more stable.

As an improvement, the emulsifier is one or more of diphenyl ethyl complex phenol polyoxyethylene ether, diglycerol polypropylene glycol ether, benzyl dimethyl phenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether phosphate and sodium diamyl succinate, so as to form a uniform and stable emulsion.

As an improvement, the method comprises the following preparation steps:

the method comprises the following steps: preparing a steam heating device, a water cooling device and a reaction kettle;

step two: weighing formaldehyde, water, urea, melamine, polyvinyl alcohol, hypochlorous acid, sodium hydroxide, an organic solvent, a stabilizer and an emulsifier according to a ratio;

step three: preparing a sodium hydroxide solution and a formaldehyde diluent, putting the prepared formaldehyde diluent into a reaction kettle, adding an organic solvent, heating the reaction kettle to 50-60 ℃, simultaneously adding a sodium hydroxide solution with the mass concentration of 25-35% to adjust the pH value in the reaction kettle to 8-9, then adding urea and melamine, wherein the adding amount of the urea is 40% of the total amount, then heating the reaction kettle to 60-80 ℃, and stirring for 30-40 min;

step four: adding urea, aniline, polyvinyl alcohol and a stabilizer into a reaction kettle, simultaneously adding hypochlorous acid to adjust the pH value in the reaction kettle to 6-7, heating the reaction kettle to 80-90 ℃, stirring for 10-15min, and preserving heat for 1 hour;

step five: cooling the reaction kettle by water, adding the rest urea, the stabilizer and the emulsifier into the reaction kettle when the temperature of the reaction kettle is reduced to 60-70 ℃, adding a sodium hydroxide solution with the mass concentration of 30-40% to adjust the pH value in the reaction kettle to 7-8, heating the reaction kettle to 75-85 ℃, and preserving the temperature for 5-10 min;

step six: and cooling the reaction kettle to 30-40 ℃, then adjusting the pH value in the reaction kettle to 8-8.5, stirring for 20-40min, and discharging to obtain the melamine modified resin adhesive.

The invention has the following advantages: the addition of the melamine can effectively reduce the brittleness of the resin adhesive finished product, so that the finished product prepared from the resin adhesive is more water-resistant and difficult to age, has longer service life, better durability and good stability, and the addition of the emulsifier while the addition of the organic solvent enables various raw materials to be well fused, thereby ensuring that the prepared melamine modified resin adhesive has better quality, less precipitate in the preparation process and higher material utilization rate.

Detailed Description

The present invention will be described in further detail with reference to examples.

Example 1

When the invention is concretely implemented, the raw materials comprise, by weight, 40 parts of formaldehyde, 30 parts of water, 20 parts of urea, 3 parts of melamine, 5 parts of polyvinyl alcohol, 4 parts of hypochlorous acid, 3 parts of sodium hydroxide, 2 parts of organic solvent, 2 parts of stabilizer and 3 parts of emulsifier; the organic solvent is formic acid, the stabilizer is hydroquinone, and the emulsifier is diphenyl ethyl complex phenol polyoxyethylene ether;

the preparation method comprises the following steps:

the method comprises the following steps: preparing a steam heating device, a water cooling device and a reaction kettle;

step two: weighing formaldehyde, water, urea, melamine, polyvinyl alcohol, hypochlorous acid, sodium hydroxide, an organic solvent, a stabilizer and an emulsifier according to a ratio;

step three: preparing a sodium hydroxide solution and a formaldehyde diluent, putting the prepared formaldehyde diluent into a reaction kettle, adding an organic solvent, heating the reaction kettle to 50-60 ℃, simultaneously adding a sodium hydroxide solution with the mass concentration of 25-35% to adjust the pH value in the reaction kettle to 8-9, then adding urea and melamine, wherein the adding amount of the urea is 40% of the total amount, then heating the reaction kettle to 60-80 ℃, and stirring for 30-40 min;

step four: adding urea, aniline, polyvinyl alcohol and a stabilizer into a reaction kettle, simultaneously adding hypochlorous acid to adjust the pH value in the reaction kettle to 6-7, heating the reaction kettle to 80-90 ℃, stirring for 10-15min, and preserving heat for 1 hour;

step five: cooling the reaction kettle by water, adding the rest urea, the stabilizer and the emulsifier into the reaction kettle when the temperature of the reaction kettle is reduced to 60-70 ℃, adding a sodium hydroxide solution with the mass concentration of 30-40% to adjust the pH value in the reaction kettle to 7-8, heating the reaction kettle to 75-85 ℃, and preserving the temperature for 5-10 min;

step six: and cooling the reaction kettle to 30-40 ℃, then adjusting the pH value in the reaction kettle to 8-8.5, stirring for 20-40min, and discharging to obtain the melamine modified resin adhesive.

Example 1

In the specific implementation of the invention, the raw materials comprise, by weight, 40 parts of formaldehyde, 30 parts of water, 3 parts of melamine, 5 parts of polyvinyl alcohol, 4 parts of hypochlorous acid, 3 parts of sodium hydroxide, 2 parts of organic solvent, 2 parts of stabilizer and 3 parts of emulsifier; the organic solvent is formic acid, the stabilizer is hydroquinone, and the emulsifier is diphenyl ethyl complex phenol polyoxyethylene ether;

the preparation method comprises the following steps:

the method comprises the following steps: preparing a steam heating device, a water cooling device and a reaction kettle;

step two: weighing formaldehyde, water, melamine, polyvinyl alcohol, hypochlorous acid, sodium hydroxide, an organic solvent, a stabilizer and an emulsifier according to a ratio;

step three: preparing a sodium hydroxide solution and a formaldehyde diluent, putting the prepared formaldehyde diluent into a reaction kettle, adding an organic solvent, heating the reaction kettle to 50-60 ℃, simultaneously adding a sodium hydroxide solution with the mass concentration of 25-35% to adjust the pH value in the reaction kettle to 8-9, then adding urea and melamine, wherein the adding amount of the urea is 40% of the total amount, then heating the reaction kettle to 60-80 ℃, and stirring for 30-40 min;

step four: adding urea, aniline, polyvinyl alcohol and a stabilizer into a reaction kettle, simultaneously adding hypochlorous acid to adjust the pH value in the reaction kettle to 6-7, heating the reaction kettle to 80-90 ℃, stirring for 10-15min, and preserving heat for 1 hour;

step five: cooling the reaction kettle by water, adding the rest urea, the stabilizer and the emulsifier into the reaction kettle when the temperature of the reaction kettle is reduced to 60-70 ℃, adding a sodium hydroxide solution with the mass concentration of 30-40% to adjust the pH value in the reaction kettle to 7-8, heating the reaction kettle to 75-85 ℃, and preserving the temperature for 5-10 min;

step six: and cooling the reaction kettle to 30-40 ℃, then adjusting the pH value in the reaction kettle to 8-8.5, stirring for 20-40min, and discharging to obtain the melamine modified resin adhesive.

Example 2

In the specific implementation of the invention, the raw materials comprise, by weight, 50 parts of formaldehyde, 20 parts of water, 4 parts of melamine, 5 parts of polyvinyl alcohol, 5 parts of hypochlorous acid, 4 parts of sodium hydroxide, 3 parts of organic solvent, 2 parts of stabilizer and 3 parts of emulsifier; the organic solvent is acetic acid, the stabilizer is p-benzoquinone, and the emulsifier is diglycerol polypropylene glycol ether;

the preparation method comprises the following steps:

the method comprises the following steps: preparing a steam heating device, a water cooling device and a reaction kettle;

step two: weighing formaldehyde, water, melamine, polyvinyl alcohol, hypochlorous acid, sodium hydroxide, an organic solvent, a stabilizer and an emulsifier according to a ratio;

step three: preparing a sodium hydroxide solution and a formaldehyde diluent, putting the prepared formaldehyde diluent into a reaction kettle, adding an organic solvent, heating the reaction kettle to 50-60 ℃, simultaneously adding a sodium hydroxide solution with the mass concentration of 25-35% to adjust the pH value in the reaction kettle to 8-9, then adding urea and melamine, wherein the adding amount of the urea is 40% of the total amount, then heating the reaction kettle to 60-80 ℃, and stirring for 30-40 min;

step four: adding urea, aniline, polyvinyl alcohol and a stabilizer into a reaction kettle, simultaneously adding hypochlorous acid to adjust the pH value in the reaction kettle to 6-7, heating the reaction kettle to 80-90 ℃, stirring for 10-15min, and preserving heat for 1 hour;

step five: cooling the reaction kettle by water, adding the rest urea, the stabilizer and the emulsifier into the reaction kettle when the temperature of the reaction kettle is reduced to 60-70 ℃, adding a sodium hydroxide solution with the mass concentration of 30-40% to adjust the pH value in the reaction kettle to 7-8, heating the reaction kettle to 75-85 ℃, and preserving the temperature for 5-10 min;

step six: and cooling the reaction kettle to 30-40 ℃, then adjusting the pH value in the reaction kettle to 8-8.5, stirring for 20-40min, and discharging to obtain the melamine modified resin adhesive.

Example 3

In the specific implementation of the invention, the raw materials comprise, by weight, 60 parts of formaldehyde, 30 parts of water, 5 parts of melamine, 6 parts of polyvinyl alcohol, 7 parts of hypochlorous acid, 3 parts of sodium hydroxide, 4 parts of organic solvent, 4 parts of stabilizer and 5 parts of emulsifier; the organic solvent is ethanol, the stabilizer is ditert-butyl-p-cresol, and the emulsifier is dibenzyl dimethyl phenol polyoxyethylene ether;

the preparation method comprises the following steps:

the method comprises the following steps: preparing a steam heating device, a water cooling device and a reaction kettle;

step two: weighing formaldehyde, water, melamine, polyvinyl alcohol, hypochlorous acid, sodium hydroxide, an organic solvent, a stabilizer and an emulsifier according to a ratio;

step three: preparing a sodium hydroxide solution and a formaldehyde diluent, putting the prepared formaldehyde diluent into a reaction kettle, adding an organic solvent, heating the reaction kettle to 50-60 ℃, simultaneously adding a sodium hydroxide solution with the mass concentration of 25-35% to adjust the pH value in the reaction kettle to 8-9, then adding urea and melamine, wherein the adding amount of the urea is 40% of the total amount, then heating the reaction kettle to 60-80 ℃, and stirring for 30-40 min;

step four: adding urea, aniline, polyvinyl alcohol and a stabilizer into a reaction kettle, simultaneously adding hypochlorous acid to adjust the pH value in the reaction kettle to 6-7, heating the reaction kettle to 80-90 ℃, stirring for 10-15min, and preserving heat for 1 hour;

step five: cooling the reaction kettle by water, adding the rest urea, the stabilizer and the emulsifier into the reaction kettle when the temperature of the reaction kettle is reduced to 60-70 ℃, adding a sodium hydroxide solution with the mass concentration of 30-40% to adjust the pH value in the reaction kettle to 7-8, heating the reaction kettle to 75-85 ℃, and preserving the temperature for 5-10 min;

step six: and cooling the reaction kettle to 30-40 ℃, then adjusting the pH value in the reaction kettle to 8-8.5, stirring for 20-40min, and discharging to obtain the melamine modified resin adhesive.

Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.