Storable plant oil-based polyurethane wood adhesive and preparation method and application thereof

A wood adhesive and vegetable oil-based technology, which is applied in the field of vegetable oil-based polyurethane wood adhesives, can solve the problems of inconvenient application of adhesives, short storage time, and low environmental protection benefits, and achieve low cost and high synthetic process. Simple, large consumer market effect

Active Publication Date: 2011-08-03
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above several vegetable oil-based polyurethane adhesives have good bonding properties, they are all two-component adhesives, which must be formulated on-site according to the formula when used, and must be used on the same day after deployment. The main reason is that they are The active period of the adhesive is too short to be stored, which brings inconvenience to the wide application of this adhesive and has certain technical defects.
[0005] Publication No. CN 101265401A Chinese patent application discloses a biomass

Method used

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  • Storable plant oil-based polyurethane wood adhesive and preparation method and application thereof
  • Storable plant oil-based polyurethane wood adhesive and preparation method and application thereof
  • Storable plant oil-based polyurethane wood adhesive and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0038] Example 1

[0039] Add 200g of commercially available vegetable oil polyol into a 500mL three-necked flask, stir and heat up to 50°C, evacuate to a vacuum of 0.08MPa, control the temperature to 105°C for dehydration for 3h, until no bubbles escape, cool to below 40°C, and put it in storage In the container with A4 molecular sieve, the moisture and impurities are further removed to obtain 187 g of dehydrated vegetable oil polyol, which is put into the dryer for later use. The vegetable oil polyols used in the following examples can all be dehydrated in this way.

Example Embodiment

[0040] Example 2

[0041] Add 200g of commercially available vegetable oil polyol into a 500mL three-necked flask, stir and heat to 60℃, evacuate to a vacuum of 0.1MPa, control the temperature to 125℃ for dehydration for 2h, until no bubbles escape, cool to below 40℃, and put it in storage In the container with A4 molecular sieve, the moisture and impurities are further removed to obtain 182 g of dehydrated vegetable oil polyol, which is put into the dryer for later use. The vegetable oil polyols used in the following examples can all be dehydrated in this way.

[0042] Method for preparing storable vegetable oil-based polyurethane wood adhesive

Example Embodiment

[0043] Example 3

[0044] 500g polymerized PAPI with a mass percentage of free isocyanate groups of 28%, 378.5g dehydrated soybean oil polyol prepared according to the method in Example 1, the dehydrated soybean oil polyol, each molecular chain contains 3.5 hydroxyl groups, weight average The molecular weight is 780, the hydroxyl value is 250mgKOH / g, the acid value is 0.08mgKOH / g, the viscosity (25°C) is 80mPa·s, the mass percentage of water content is 0.06%, and 188.3g of acetone is mixed in a three-necked bottle. 0.24g of dibutyltin dilaurate was dissolved in 1g of acetone and then added dropwise to a three-necked flask, filled with nitrogen protection, stirred for 25min, slowly heated to 80℃, reacted for 2h, the viscosity of the reaction solution reached 300mPa·s, stop heating, and then Add 189g of acetone, cool down to 40°C and discharge to obtain 1255g of storable vegetable oil-based polyurethane adhesive, and place it in a dry container for airtight storage. The adhesive i...

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Abstract

The invention discloses a storable plant oil-based polyurethane wood adhesive. The adhesive is prepared from 20-50 percent by mass of plant oil polylol, 25-45 percent by mass of isocyanate, 0.01-0.1 percent by mass of catalyst and 5-35 percent by mass of solvent, is accordant with the developing trend of novel environmentally-friendly and low-carbon materials, has high storage performance, high cementing property, high water resistance and long storage life, can be cured at room temperature and can be applied to a wood adhesive. The invention also discloses a preparation method of the storable plant oil-based polyurethane wood adhesive. The preparation method has simple steps, low requirements of technological conditions and very high economic benefit, and contributes to industrial production.

Description

technical field [0001] The invention relates to the field of adhesives, in particular to a storable vegetable oil-based polyurethane wood adhesive, a preparation method and an application. Background technique [0002] Vegetable oil-based polyurethane adhesive is a new type of adhesive that has been researched in recent years. It is an adhesive synthesized from renewable vegetable oil polyols. It has good initial tack, no formaldehyde release, good water resistance, It has the advantages of good aging resistance and high bonding strength. The bonding effect of the vegetable oil-based polyurethane adhesive is comparable to that of the corresponding petroleum-based materials, and at the same time, it has better environmental, economic and social benefits. [0003] Vegetable oil-based polyurethane adhesive is a copolymerization product of isocyanate and vegetable oil polyol. Its molecular chain contains active -NCO groups and -NHCOO- groups, which are easy to react with substa...

Claims

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Application Information

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IPC IPC(8): C09J175/14C08G18/67
Inventor 吴朱锦刘小青
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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