A kind of preparation method of nano-silica rosin modified urea-formaldehyde resin

A technology of nano-silica and urea-formaldehyde resin, which is applied in the fields of aldehyde/ketone condensation polymer adhesives, adhesive types, adhesive additives, etc., and can solve the related reports of nano-silica rosin-modified urea-formaldehyde resins that have not been found. and other problems, to achieve the effect of lowering temperature, reducing cost and improving water resistance

Active Publication Date: 2016-09-14
桂林兴松林化有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] After consulting the data, there is no relevant report on nano-silica rosin modified urea-formaldehyde resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of nano silica rosin modified urea-formaldehyde resin comprises the following preparation steps:

[0029] (1) 178 parts by weight of a mass concentration of 37% formaldehyde solution into the reactor, start the agitator, gradually pH value to 7.5 with the mass concentration of 10% NaOH, slowly drop into the first batch of urea 66 parts by weight, while adding 2% polyvinyl alcohol, heat up to 90°C, react for 10 minutes, slowly add 33 parts by weight of the second batch of urea, keep warm for 30 minutes, finally adjust the pH value of the reaction solution to 7.5, slowly add 11 parts by weight of remaining urea, keep warm for 20 minutes , stop heating, cool to room temperature, adjust the pH value to neutral, and discharge to obtain a condensation liquid;

[0030] (2) Put 400 parts by weight of rosin into the reactor, heat up to 160°C, add 6 parts by weight of maleic acid, 2 parts by weight of glycerol, 55 parts by weight of pentaerythritol and 0.03...

Embodiment 2

[0034] The preparation method of nano silica rosin modified urea-formaldehyde resin comprises the following preparation steps:

[0035] (1) 232 parts by weight of mass concentration of 37% formaldehyde solution into the reactor, start the agitator, gradually pH value to 7.8 with the mass concentration of 15% NaOH, slowly drop into the first batch of urea 86 parts by weight, while adding 3% polyvinyl alcohol, heat up to 91°C, react for 12 minutes, slowly add 33 parts by weight of the second batch of urea, keep warm for 35 minutes, finally adjust the pH value of the reaction solution to 7.8, slowly add 13 parts by weight of remaining urea, keep warm for 25 minutes , stop heating, cool to room temperature, adjust the pH value to neutral, and discharge to obtain a condensation liquid;

[0036] (2) Put 430 parts by weight of rosin into the reactor, heat up to 165°C, add 5 parts by weight of maleic acid, 3 parts by weight of glycerol, 50 parts by weight of pentaerythritol and 0.04 par...

Embodiment 3

[0040] The preparation method of nano silica rosin modified urea-formaldehyde resin comprises the following preparation steps:

[0041] (1) 281 parts by weight of a mass concentration of 37% formaldehyde solution into the reactor, start the agitator, gradually pH value to 8.0 with the mass concentration of 15% NaOH, slowly drop into the first batch of urea 112 parts by weight, while adding 3% polyvinyl alcohol, heat up to 93°C, react for 13 minutes, slowly add 32 parts by weight of the second batch of urea, keep warm for 33 minutes, finally adjust the pH value of the reaction solution to 8.0, slowly add 16 parts by weight of remaining urea, keep warm for 23 minutes , stop heating, cool to room temperature, adjust the pH value to neutral, and discharge to obtain a condensation liquid;

[0042] (2) Put 450 parts by weight of rosin into the reactor, heat up to 170°C, add 5 parts by weight of maleic acid, 3 parts by weight of glycerol, 48 parts by weight of pentaerythritol and 0.0...

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Abstract

The invention belongs to the technical field of urea-formaldehyde resin preparation, and particularly relates to a preparation method of a nano silicon dioxide / rosin modified urea-formaldehyde resin. The method comprises the following steps: preparing a urea-formaldehyde resin from urea and formaldehyde by a weak alkali-weak acid-weak alkali technique, and modifying with nano silicon dioxide and rosin to obtain the nano silicon dioxide / rosin modified urea-formaldehyde resin. The method has the advantages of simple technique and accessible raw materials, and is suitable for industrialized mass production. The prepared urea-formaldehyde resin has the advantages of favorable viscosity, high softening point, low free formaldehyde content, environment friendliness, higher water resistance, favorable toughness and improved aging resistance, is suitable for artificial board production, and can be used as an adhesive in material binding, bamboo / wood processing, paper binding, steel paints, multicolor pattern paints and other industries.

Description

technical field [0001] The invention belongs to the technical field of urea-formaldehyde resin preparation, in particular to a preparation method of nano-silica rosin-modified urea-formaldehyde resin. Background technique [0002] Urea-formaldehyde resin refers to the polycondensation reaction of urea and formaldehyde under the action of a certain catalyst (acidic or basic catalyst) to form an initial urea-formaldehyde resin, and then under the action of a curing agent or auxiliary agent to form an insoluble, infusible final stage resin. [0003] Urea-formaldehyde resin (UF resin) has a series of characteristics such as high bonding strength, water resistance, heat resistance, corrosion resistance, fast curing, colorless curing adhesive layer, simple production, good operability, excellent performance, low cost, and rich sources of raw materials. It is one of the earlier thermosetting resins developed. In 1924, the British cyanamide company developed it, and began to sell ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/32C08K3/36C08G12/40C08G12/12C09J161/32C09J11/04
Inventor 胡晓明黄红秀刘桂芳范辂
Owner 桂林兴松林化有限责任公司
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