Lignosulfonic acid calcium salt

Catalog	ACFM-HP-A8061527
CAS	8061-52-7
Appearance	Pale yellow to yellow, tan or orange-brown powder
Identification	(IR):To conform to standard
Lignosulfonates	50.0 - 60.0 %
Sample Lot No.	A22GY04081
Water Content	≤ 10.0%(KF)
Water Insoluble Matter	≤ 1.5%

Case Study

Calcium Lignin Sulfonate as an Adhesive for the Preparation of Environmentally Friendly Fiberboards

Antov, Petar, et al. Polymers, 2021, 13(4), 639.

Calcium lignin sulfonate (CLS) was used as a lignin-based formaldehyde-free adhesive to produce environmentally friendly fiberboard composites from residual wood fibers from the pulp and paper industry. The results showed that the elastic modulus (MOE) and flexural strength (MOR) values of the composites with 14% CLS content were comparable to the standard requirements of medium density fiberboard (MDF) used in dry conditions. In addition, the formaldehyde content of the produced fiberboards was close to zero, reaching the super E0 level (≤1.5mg/100g), with values ranging from 0.8mg/100g to 1.1mg/100g, which is comparable to the formaldehyde emission of natural wood.
Manufacturing of fiberboards
· Calcium lignin sulfonate (CLS) was used as a binder at 8%, 10%, 12% and 14% (based on fiber dry weight). The waste fibers were pretreated using a laboratory hammer mill. After the initial treatment, the bulk density of the residual fibers was reduced from 28.49 kg·m^-3 to 17.47kg.m^-3.
· Waste softwood fibers were blended with the CLS additive in a high-speed blender equipped with needle-shaped paddles operating at 850 rpm. The CLS or UF resin was sprayed through a 1.5 mm nozzle, followed by a paraffin emulsion injection. Hot pressing was conducted in a single-opening hydraulic press at 200°C. A four-stage pressure profile was employed: Pressure increased up to 4 MPa; Pressure decreased to 1.2 MPa; Pressure maintained at 0.8 MPa; Pressure raised to 1.5 MPa.

Calcium Lignosulfonate Environmentally Friendly Additive Used in Cross-Linked Fiber Composite Materials

Oliwa, R., M. Oleksy, et al. Polimery, 2018, 63(2), 102-108.

Calcium lignosulfonate (CLS) was used as an environmentally friendly additive to cross-link fiber composites with phenolic resins. Glass fiber meshes were impregnated with these compositions and the mechanical properties of the prepared samples were determined. Experiments have shown that using CLS as an additive in phenolic resins helps improve the mechanical properties of the final product. The dynamic strength was significantly increased by approximately 15 % and the shear stress by approximately 66 % compared to the composite with unmodified resin. Furthermore, the homogenization process used and the technique of adding calcium lignosulfonate to obtain the impregnated network allow for its homogeneous distribution in the polymer composition.
Preparation of phenolic resin composites adding CLS
· A quantity of 1.0 wt % of modified bentonite or CLS was incorporated into a liquid phenol-formaldehyde resin through a multi-step homogenization process. First, the components were mixed using a slow-moving mechanical stirrer at room temperature. The mixture was then heated to 50 °C and subjected to ultrasonic homogenization. The next phase involved high-speed agitation in a vacuum vessel at 50 °C, at a stirring speed of 4000 rpm. The final homogenization step was performed using a cylinder-cylinder grinder with a cylinder rotating at 6000 rpm.
· The resulting phenol-formaldehyde resin containing 1.0 wt % of modified bentonite or CLS was utilized to impregnate fiberglass meshes of varying weights-195, 265, or 464 g/m²-through a grooved roll. These impregnated meshes were then dried at temperatures ranging from 90 to 140 °C.