ISBN : 978-602-17761-4-8
19
Proceedings of 2
nd
REPTech Crowne Plaza Hotel, Bandung, November 15-17, 2016
© 2016 Published by Center for Pulp and Paper through 2
nd
REPTech
5. Moisture Regains
The results of moisture regain testing can be seen in Table 4. The percentage of moisture regain in polyester cellulose fabric depends on the amount of cellulose component, the greater the cellulose
components of the greater value of moisture regain. This is happen because the polyester is hydrophobic and cellulose is hydrophilic and this phenomenon related to the dimensional stability and crease
recovery of the fabric properties. To increase the moisture regain of the minimum cellulose component necessary to change the physical and chemical structure with increase the absorption properties of
cellulose to water. Therefore the process carboxymethyl cellulose can improve moisture regains value. Improvements moisture regains the cellulose polyester fabric depends not only on the reduction of
polyester due to strong alkaline usage , but also depends on the number of carboxymethyl groups that exist and changes the cellulose molecular structure is the following:
T
able 4 showa the moisture regains carboximethylation processes test results, it can be seen that the
process can increase the moisture regain of polyester cellulose fabric, the use of higher concentrations of sodium hydroxide up to 8N and sodium chloroacetate until 3N will be increasing the moisture regain.
At the higher concentrations the moisture regains will be decreased, the increasing moisture regain is possible due to the reduction of the content of polyester is being eroded by the sodium hydroxide.
The use of strong alkaline cellulose will cause a decrease in the degree of crystalline of the cellulose
ibers, when the use of alkali concentration not to damage the cellulose, the degradation of cellulose ibers crystalline will lead swollen and become more open. Another thing that causes moisture regain
increased is formed free hydrogen groups, carboxymethyl -CH2COOH- and carbonyl -C = O groups that are hydrophilic., Cellulose molecular structure changes due to substitution Carboxymethylation
cause increased humidity [12], thus becoming more hygroscopic cellulose and cellulose resulted in an
increased afinity to chemicals. It can also be demonstrated in Table 1 The absorption of Methylene Blue Dye obtained at the highest moisture regain combination in concentration 2N sodium chloroasetat, 12N
sodium hydroxide and 10 hours batching times, the percentage of 5,9 moisture regain .
Table 4. Moisture Regains
Batching Hours
Sodium Hydroxide N Sodium Chloracetate N
2 3
4 2
6 3.6
4.0 3.5
8 4.0
4.7 4.2
10 4.0
4.1 4.1
12 5.0
3.9 3.8
4 6
4.1 4.2
3.6 8
4.1 4.8
4.8 10
4.6 4.2
4.2 12
5.2 4.1
4.1 6
6 4.2
4.3 3.6
8 4.3
5.0 4.8
10 4.7
4.4 4.4
12 5.4
4.4 4.2
8 6
4.2 4.4
3.9 8
4.6 5.2
4.8 10
4.7 4.6
4.6 12
5.4 4.5
4.5 10
6 4.4
4.5 4.4
8 4.9
5.3 5.0
10 5.3
4.8 4.8
12 5.9
4.6 4.6
Raw material 3.0
ISBN : 978-602-17761-4-8
20
Proceedings of 2
nd
REPTech Crowne Plaza Hotel, Bandung, November 15-17, 2016
© 2016 Published by Center for Pulp and Paper through 2
nd
REPTech
6. Crease Recovery
