Alkyl Phenolic Resin (APU-20-58G)

Key feature

● Softening point (Ring & Ball): 118-125

● Appearance: pale yellow lump

● Enhance the adhesion strength

● Increase the phasing stability

● Increase the heat resistance

● Improve the tackiness retention time

Application

Printing coating agents, adhesive tackifier, printing ink, paint, synthetic leather and PVC leather to enhance  the adhesive viscosity. 

Introduction

Though chloroprene rubber has an excellent weathering, oil and chemical resistance, it is necessary, in practice, to make use of a modifying agent to improve the properties of chloroprene rubber adhesive, such as tackiness retention time, phasing stability, heat resistance and adhesion strength. “APU-20-58G” is excellently compatible with chloroprene rubber and an indispensable modifying agent for chloroprene rubber for manufacturing adhesive to meet specific purposes.

Alkyl phenolic resin

1) Specifications

ITEM NO.

Appearance

MgO Reactivity(%)

Softening point (oC, R&B)

APU-20-58G

Pale yellow, lump

6.8

118-125

2) Typical Formulation (MgO Pre-reation)

Part 1

Parts by wt.

Chloroprene TA-50

100

MgO

4

ZnO

5

Stabilizer

2

  Part 2

Parts by wt.

APU-20-58G

50

Toluene

150

MgO

5

Water

0.5

  Part 3

Parts by wt.

Toluene

96

n-Hexane

123

Ethyl acetate

123

(Solvent formula in total : Toluene/n-Hexane/Ethyl acetate = 2/1/1)

 

Procedure

Mix ingredients of Part 1 together on milling roll then dissolve in mixed solvent (Part 3). Stir Part 2 in a vessel for 5 hours, then add it the mixture of Part 1 and Part 3. Keep agitation further 5 hours to give adhesive of 25% solids.

3) Adhesive Properties

ITEM NO.

Adhesion Strength

Tackiness
Retention

Heat
Resistance

Phasing
Resistance

After 5 hours

After 24 hours

At 60oC

APU-20-58G

A-B

A

A-B

C

A-B

B

A : Excellent

B : Good
C : Fair
D: Poor

 

a) Heat Resistance

ITEM NO.

Heat Resistance (oC)

Result

APU-20-58G

90

A-B

 

Test Conditions

Method

ASTM-D-816-55

Weight

500g

Adherend

Steel to vulcanized rubber

Test Conditions

Kept 3 days after bonding

Temperature graduation

2oC/5 min

 

b) Phasing Resistance

Adhesives in stoppered jar were kept for one month at 20oC then phasing was observed

Excellent

Completely no phasing

Good

Top part is slightly phasing

Fair

5% of upper part is phasing

Poor

50% of adhesive is phasing

 

c) Tackiness Retention Time

ITEM NO.

Tackiness Retention Time

Result

APU-20-58G

9 min, 30 sec.

D

 

d) Adhesion Strength

 

Test Conditions

Peeling angle

180o

Adhesion strength at 60oC

Test pieces were kept 3 days after bonding then kept one hour at 60oC before test.

Adherend

Steel to canvas

Peeling velocity

200 mm/min 200

Temperature

20oC (68oF)

 

ITEM NO.

Elapsed Days

At 60oC

Initial Strength

1

3

7

Result

1 hour

Result

5 hours

Result

APU-20-58G

5.6

12.0

15.0

A

7.2

A-B

3.1

A-B

Unit : kg/25 mm2

 

 

e) Shear strength


Test Conditions

Shearing velocity

50 mm/min

Glued area

10 mm x 25 mm

Test Conditions

at 20oC (68oF)

Open time

10 min

Bonded material

Plywood to plywood

 

ITEM NO.

Elapsed Days

Result

1

3

7

APU-20-58G

24.2

33.2

44.2

B

 Unit : kg/25 mm2