Environmentally friendly biopolymer adhesives and applications based thereon
A technology of adhesives and antimicrobial agents, applied in the direction of starch-derived adhesives, adhesive types, starch adhesives, etc., can solve problems such as no examples provided
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Embodiment 1
[0025] Example 1 - Preparation of Biopolymer Latex Adhesive from Starch Nanoscale Particles
[0026] Biopolymer nanoparticles were prepared by reactive extrusion processing using the technique described in WO 00 / 69916. Native potato starch (PN), wheat starch (WN), corn starch (CN) and waxy corn starch (WCN) were used to prepare nanoscale particles. The extruded gel particles, including starch nanoparticles, were then dispersed in water with mechanical agitation. The nanoscale particles (up to 35% (w / v) solids) were dispersed with a 3-blade mixer at 200 rpm at 45°C for 15 to 60 minutes. The stability of the resulting biopolymer latex was found to depend on the level of starch and crosslinking.
[0027] Dispersions made from PN, CN and WN extruded samples with glycerol and glyoxal were only stable for a few hours at glyoxal levels less than 4 parts, and the dry films obtained from these dispersions were opaque. This is illustrated in the PN starch section of Table 1. The r...
Embodiment 2
[0033] Example 2 - Biodegradable school glue based on biopolymer latex as a synthetic polymer Alternatives to Vinyl Acetate-Based School Glue
[0034] Natural polymers, such as starch, generally have poor shelf-life stability. The reasons for the short shelf-life stability of aqueous biopolymer dispersions are due to two aspects: (1) starch binder solutions and pastes have a very strong tendency to become gels or retrograde, and their stability is only a few hours or a few hours. days; and (2) starch binders in water provide a good growth medium for fungal and bacterial growth. Consumers are accustomed to white polyvinyl acetate latex school glue, which dries quickly and has shelf-life stability of more than six months. The data shown in Example 1 confirms the problems outlined in the first point. The data in Table 2 illustrate the issues discussed in the second point.
[0035] Table 2: 20% EXL201 dispersion with 1% preservative compared to test starch at room temperatu...
Embodiment 3
[0039] Example 3 - Biopolymer Particle-Based Adhesives as Bio-Based Alternatives to Synthetic Adhesives
[0040] An important property of the paper after it is pasted together is the strength of the adhesive layer. The SCT value indicates the hardness of the sticker and the Burst factor indicates the strength. Changes in strength and hardness after application of an adhesive layer give information on the nature of this adhesive layer.
[0041] Compared to polyvinyl acetate (PVA) glue, the strength and stiffness of the stickers increased more when starch spread was used (Table 3). This indicates that the adhesive layer of the starch dispersion adds more paper properties than the synthetic glue.
[0042] Table 3: SCT and Burst of Paper and Sticker Samples
[0043] Adhesive coverage (g / m 2 )
[0044] The results in Table 3 demonstrate that many applications are feasible for adhesives based on biopolymer particles as biobased alternatives to synthetic adhesives....
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