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Calixarene modified attapulgite/urea resin composite adhesive and preparation method thereof

A composite adhesive and urea-formaldehyde resin technology, applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesives, adhesive types, etc., can solve the problem of high free formaldehyde content, achieve the effect of reducing free formaldehyde content and improving bonding strength

Active Publication Date: 2014-04-16
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in the prior art, in the urea-formaldehyde resin adhesive, the content of free formaldehyde is too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Add 0.1 kg of diphenylmethane diisocyanate and 0.5 kg of calix[4]arene to 10 kg of acetone solvent, raise the temperature to 60°C, and mechanically stir and reflux for 6 hours, then add 1 kg of activated attapulgite to the above system Continue to stir and reflux for 12 hours, distill under reduced pressure to recover the solvent, filter, wash with absolute ethanol, dry at 65°C, and jet mill to prepare the calixarene-grafted nano-attapulgite inorganic-organic composite adsorbent.

[0027] 2. In 5.0 kilograms of industrial-grade formaldehyde solution with a mass percent concentration of 37%, add 0.75 kilograms of industrial-grade urea with a mass percent concentration of 99%, while stirring, use 25% sodium hydroxide The solution adjusts the pH value of the system to 9.0, raises the temperature to 90°C, and keeps it warm for 20 minutes; continue to add 1.79 kg of industrial grade urea with a mass percentage of 99% to the above reaction solution, and keep it warm for 30 ...

Embodiment 2

[0029] 1. Add 0.1 kg of isophorone diisocyanate and 0.2 kg of calix[6]arene to 20 kg of dimethylformamide solvent, raise the temperature to 85°C, mechanically stir and reflux for 2 hours, then add 6 Kilogram activated attapulgite, continue to stir and reflux for 6 hours, distill under reduced pressure to recover the solvent, filter, wash with absolute ethanol, dry at 50°C, and jet crush to prepare the calixarene-grafted nano-attapulgite inorganic-organic composite adsorbent.

[0030] 2. Add 3.88 kg of industrial-grade urea with a mass percentage of 99% to 15.0 kg of industrial-grade formaldehyde solution with a mass percentage concentration of 40%, and adjust the system with 10% ammonia water while stirring The pH value is 10.5, the temperature is raised to 75°C, and the heat preservation reaction is carried out for 40 minutes; 3.64 kg of industrial grade urea with a mass percentage content of 99% is continued to be added to the above reaction solution, and the heat preservatio...

Embodiment 3

[0032] 1. Add 0.4 kg of triphenylmethane triisocyanate and 1.0 kg of calix[8]arene to 20 kg of chloroform solvent, raise the temperature to 70°C, mechanically stir and reflux for 5 hours, then add 3.0 kg of activated attapulgite to the above system Continue to stir and reflux for 9 hours, distill under reduced pressure to recover the solvent, filter, wash with absolute ethanol, dry at 55°C, and jet mill to prepare the calixarene-grafted nano-attapulgite inorganic-organic composite adsorbent.

[0033] 2. Add the commercially available urea-formaldehyde resin (Jiahe Chemical) to the commercially available urea-formaldehyde resin (Jiahe Chemical), adjust the pH of the system to 5.0 with a 20% mass percent concentration of ammonium chloride solution, and continue stirring until the viscosity of the system mixture reaches 65mPa· s, add the calixarene grafted nano-attapulgite inorganic-organic composite adsorbent prepared in step (1), the ratio of the mass of the inorganic-organic co...

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Abstract

The invention relates to the technical fields of deep processing of nonmetal ores and application of high polymer materials, in particular to an attapulgite / urea resin composite adhesive with a low formaldehyde releasing rate, and a preparation method of the composite adhesive. According to the preparation method, isocyanate is firstly adopted to graft a calixarene molecule onto the surface of nano attapulgite to prepare an inorganic-organic composite adsorbent; a nano calixarene adsorbent is added into the urea resin at the temperature of 70-85 DEG C, mixing at the thermal-insulation situation for reaction are performed for 15-30 min, the pH value of the system is adjusted to 7.5-9.5, and the calixarene modified attapulgite / urea resin composite adhesive is prepared. By adding the attapulgite adsorbent, a synergy adsorption effect on the free formaldehyde in the urea resin is realized, so that the adhesion strength of the composite adhesive is further improved.

Description

technical field [0001] The invention relates to the technical field of deep processing of non-metallic ore and application of polymer materials, in particular to an attapulgite / urea-formaldehyde resin composite adhesive with low formaldehyde release and a preparation method thereof. Background technique [0002] As the most widely used adhesive in the wood industry, urea-formaldehyde resin adhesive has the advantages of convenient synthesis and low cost, but its disadvantage is the high content of free formaldehyde. At present, the methods for reducing the content of free formaldehyde in urea-formaldehyde resin mainly include controlling the molar ratio of formaldehyde to urea, extracting free formaldehyde in the product, adding organic modifiers and porous inorganic fillers, etc. Although reducing the molar ratio of formaldehyde and urea reduces the free formaldehyde content of urea-formaldehyde resin to a certain extent, its mechanical properties are greatly reduced and th...

Claims

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Application Information

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IPC IPC(8): C09J161/24C09J11/04C09J11/02C09C1/28C09C3/08C08G12/12
Inventor 姚超李洁刘文杰左士祥罗士平李霞章夏建文
Owner CHANGZHOU UNIV
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