Retention of the hottest starch on wheat straw pul

2022-10-23
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Retention of modified starch on wheat straw pulp

key points: the retention of various modified starch from different provenances and different degrees of substitution on wheat straw pulp under different wet end chemical properties was studied, and the control experiment was carried out with eucalyptus pulp. In general, the retention rate of starch on wheat straw pulps is higher than that on Eucalyptus pulps. The addition amount on Eucalyptus pulps should not exceed 2%. We promise a one-year warranty. The addition amount on wheat straw pulps should be less than 3%

key words: modified starch; Wheat straw pulp; Wet end chemistry

Cheng Jinlan, master, mainly engaged in the research of wet end chemistry of papermaking

modified starch is an important additive in the paper industry. Based on the consumption of paper raw materials, its consumption ranks third after fiber and filler [1]. Among the paper intensifiers in North America and Western Europe, modified starch accounts for about 95%. According to the research results of J. C. Roberts and Richard D. Harvey [2,3], the more starch left on the paper, the better the strength of the paper. Studying the retention of starch on the size is of great significance to reflect its strengthening effect

1 experimental raw materials and methods

wheat straw pulp, beating degree 37 ° SR; Bleached Eucalyptus pulp, beating degree 37 ° SR; Polyethyleneimine (PEI), concentration 5%, viscosity 500mpa s; Phs-10a digital acidity/ion meter; DDS-11A conductivity tester; Bzf-1 Bauer type development cooperation mode and specific product pulp fiber screening instrument; Uv-2201 spectrophotometer; Modified starch (see Table 1)

the detection method of starch retention refers to TAPPI t419 standard. At the maximum wavelength, measure the absorbance of different modified starch under a certain concentration gradient, and make the working curve of absorbance a -- starch solution concentration C. Take a certain amount of starch solution

Table 1 Types and properties of denatured starch

model

provenance

degree of substitution

a-c linear regression equation

ionic type

manufacturer

hac-03

tc-20

tc-35

c50t

am HS

b <.Anti loose installation shall be provided/p>

b

corn

cassava

cassava

potato

potato

corn

corn

0.049

0.024

0.042

0.06

0.042

a=0.00915c+0.0177

a=0.0077c+0.0838

a=0.01558c+ 0.0534

a=0.01401c+0.0649

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