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Novel water-based adhesives for industrial applications

A water-based adhesive, technology for industrial applications, used in adhesives, protein adhesives, starch adhesives, etc.

Inactive Publication Date: 2008-09-10
HENKEL KGAA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although commercially available adhesives for industrial applications are optimized for various applications, they are water-based liquid adhesives and therefore have the above-mentioned disadvantages of not being in powder form

Method used

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  • Novel water-based adhesives for industrial applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] [041] For the preparation of reference adhesive Ref 1, a total of 252 g of water was weighed in a 400 ml plastic jar and stirred at 600-700 rpm using a standard laboratory mixer fitted with a 55 mm wide stirring blade. 48g starch powder (Solvicol GP 45 Plus * , from Avebe) was slowly added at a steady rate to a vortex of water. After the powder addition was complete, the mixture was stirred for a total of one hour.

[0045] [042] For the preparation of adhesives Adh 1a and 1b, the above steps were repeated using only 244.5 g of water. Five minutes after the starch addition was complete, water redispersible polymer powder (7.5 g) was added slowly. Pocket and grit formation was not observed.

[0046] Table 1: Using pure water-soluble polymer powder (Ref 1) based Cure speed, tack and machine speed of the adhesive to bond kraft paper to kraft paper.

[0047] Ref 1

Adh 1a

Adh 1b

water [parts]

84

81.5

81.5

WSPP[parts] a...

Embodiment 2

[0060] [045] The reference adhesive Ref2 was prepared similarly to Adh 1a and 1b, but using the amounts mentioned in Table 2 and replacing the water-redispersible polymer powder with a liquid adhesive (Forbo Ulitex 34785).

[0061] [046] Adhesives Adh 2a, 2b and 2c were prepared similarly to Adh 1a and 1b, but using the amounts mentioned in Table 2. Small lumps and grit were not observed.

[0062] Table 2: Commercial adhesives based on water soluble polymer powder and liquid emulsion adhesives compared to Adh 2a to Adh 2c where liquid adhesive was replaced by water redispersible polymer powder (same solids content) (Ref 2), Adhesion of kraft paper bonded to polyethylene coated paper with a surface tension of 36 dynes / cm.

[0063]

[0064] a) Water soluble polymer powder (WSPP) is cold water soluble, pregelatinized and hydrolyzed potato starch (Solvicol GP 45 Plus * , from Avebe).

[0065] b) The liquid emulsion adhesive is a commercial polymer dispersion based adhesive g...

Embodiment 3

[0081] [049] Reference adhesive Ref3a was a commercial adhesive and was applied as such. Adhesives Ref 3b and 3c are water-based emulsion polymers adjusted to the stated solids and viscosities, see Table 3, footnotes b) and c). Adhesives Adh 3a and 3b were prepared similarly to Adh 1a and 1b using the relative amounts given in Table 3.

[0082] Table 3: High Density Bonded with Commercial High Performance Water Dispersion Based Adhesive Grades Compared to Synthetic Polymer Dispersions and Mixtures of Water Based Polymer Powder (Starch) and Water Redispersible Polymer Powder Adhesion values ​​for polyethylene (HDPE) sheets - with a surface tension of 36 dyne / cm - and kraft paper.

[0083] Ref3a a)

Ref

3b b)

Ref

3c c)

Adh 3a

Adh 3b

water [parts]

-

-

-

59

59

WSPP[parts] d)

-

-

-

10

10

WRPP [part] e)

-

-

-

38 f)

...

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Abstract

The invention relates to water-based adhesives for industrial applications obtained by mixing water-redispersible polymer powder and water-soluble polymer powder with water, wherein the weight ratio of the water-redispersible polymer powder to the water- soluble polymer powder is from about 0.001 : 1 to 100 : 1 and the water-based adhesive has a set speed of less than 300 sec, when measured with a 36 [mu]m thick layer at 23 DEG C and 50% relative humidity and 385 [mu]m thick carton boards with a weight of 275 3 g / m<2> and Cobb values on one side of 43 g / min / m<2> and 27 g / min / m<2> on the other side, has a solids content of about 7.5 to 70 wt.-% and a Brookfield viscosity at 23 DEG C at 20 rpm, measured according to the ASTM D1084 standard, of about 500 to 10'0OO mPas. The water-based industrial adhesive has the capability to bond a low surface tension substrate to a cellulosic substrate, in particular with a weight-ratio of water-redispersible polymer powder to water-soluble polymer powder from about 0.5 : 1 to 100 : 1 , thus can replace conventional aqueous adhesives based on synthetic polymer dispersions. The benefits of the invention are manifold such as faster set speeds and increased machine speeds, logistical advantages due to handling powders instead of liquids, leading to e.g. prolonged shelf life, no water transportation and being an environmentally friendly, low VOC containing adhesive.

Description

technical field [0001] [001] The present invention relates to a water-based adhesive for industrial use obtained by mixing a water-redispersible polymer powder and a water-soluble polymer powder with water. Background technique [0002] [002] Water-based adhesives are widely used in many different applications. For less demanding substrates, such as porous cellulose-based materials, adhesives are generally used, which are based on modified or unmodified polysaccharides, such as cellulose ethers, starch ethers or unmodified starch. Adhesives of this type do confer great advantages, since these polysaccharides are usually available in powder form. They therefore do confer all the benefits associated with powders, eg being freeze-thaw stable, generally having a longer shelf life due to no or significantly lower microbial attack, and transport benefits as no transport water is required. In recent years, it has been discovered that the modification of polysaccharide-based binde...

Claims

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Application Information

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IPC IPC(8): C08J3/12
CPCC09J189/00C08J3/05C08J2301/26C08L23/0846C09J103/02C08L31/04C08L2666/02C08L2666/04
Inventor N·帕特尔R·斯托普斯C·马尼宁
Owner HENKEL KGAA
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