Application – A professional manufacturer of polyvinyl acetate | PVAC resin | vinyl acetate homopolymer

PVAC Resin for PLA Boidegradable Plastics

nitchen_dash — Mon, 06 Apr 2026 03:24:13 +0000

Application of Polyvinyl Acetate (PVAc) in Solubilization and Toughening Modification of PLA
Polyvinyl acetate (PVAc), as a solubilizing and toughening modifier for polylactic acid (PLA), has important applications in the field of biodegradable plastics. PVAc has good compatibility with PLA and can be uniformly dispersed in the PLA matrix to form a stable blend system. The molecular chain of PVAc contains ester groups, which have a similar molecular structure to PLA. There is a strong intermolecular force between the two, which can effectively improve the toughness of PLA.

PLA degradable plastic

PLA is a biodegradable plastic derived from renewable resources such as corn starch, which has excellent mechanical properties and biocompatibility, but has disadvantages such as high brittleness and poor impact resistance. PVAc can effectively improve the toughness and processability of PLA while maintaining its biodegradability through blending modification with PLA.
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📊 Main advantages
1. Good compatibility
PVAc has good compatibility with PLA and can be uniformly dispersed in the PLA matrix to form a stable blend system. The molecular chain of PVAc contains ester groups, which have a similar molecular structure to PLA. There is a strong intermolecular force between the two, which can effectively improve the toughness of PLA.
Research has shown that the addition of PVAc can promote the crystallization of PLA, increase its crystallinity and crystallization rate, thereby improving the mechanical and processing properties of PLA.
2. Significant toughening effect
PVAc has a low glass transition temperature (Tg of approximately 30-40 ℃) and can form a flexible phase in the PLA matrix, absorbing and dispersing impact energy, thereby significantly improving the impact resistance of PLA. When the amount of PVAc added is 10-20%, the impact strength of PLA can be increased by 2-5 times.
PVAc can also improve the fracture elongation of PLA, transforming it from a brittle material to a tough material and expanding its application range.
3. Biodegradability
PVAc itself has good biodegradability and can be decomposed into carbon dioxide and water by microorganisms in natural environments, without causing pollution to the environment. The blend of PVAc and PLA also has good biodegradability and can fully comply with the relevant standards for biodegradable plastics.
The addition of PVAc does not affect the biodegradation rate of PLA, but may instead promote its degradation, as the degradation products of PVAc can provide nutrients for microorganisms, accelerating their growth and reproduction.
4. Good processing performance
PVAc has good processing performance and can be blended with PLA on conventional plastic processing equipment (such as extruders, injection molding machines, etc.) to prepare products of various shapes and sizes. The addition of PVAc can reduce the melting temperature and viscosity of PLA, improve its flowability and formability, and reduce energy consumption and scrap rate during processing.
PVAc can also improve the thermal stability of PLA, increase its thermal deformation temperature and heat resistance, and expand its application range in high-temperature environments.
5. Cost advantage
PVAc has a relatively low production cost and a significant price advantage compared to PLA. The addition of PVAc can reduce the production cost of PLA products and improve their market competitiveness.
PVAc has a wide range of sources, mature production processes, and can be produced on a large scale to meet the market demand for PLA solubilization and toughening modifiers.

pvac for degradable pla plastics

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🔧 Instructions for use
1. Blending modification
Pre mix PVAc and PLA in a high-speed mixer at a certain ratio (usually 10-20% PVAc added), and then add the pre mixed material to the extruder for melt blending and extrusion to prepare PVAc/PLA blend.
The processing temperature of the extruder is usually 170-190 ℃, and the screw speed is 100-200rpm. The extruded blend can be prepared into particles through a pelletizing mechanism for subsequent processing such as injection molding, blow molding, and stretching.
2. Reactive blending modification
During the blending process of PVAc and PLA, an appropriate amount of reactive additives (such as maleic anhydride, diisopropylbenzene peroxide, etc.) can be added to form chemical bonds between PVAc and PLA through reactive blending, thereby improving the compatibility and interfacial bonding between the two and further enhancing the mechanical and processing properties of PLA.
The processing temperature for reactive blending is usually 180-200 ℃, and the screw speed is 150-250rpm. The blend after reactive blending has better mechanical properties and thermal stability, which can meet higher requirements for application scenarios.
3. Forming and processing
PVAc/PLA blends can be processed through injection molding, blow molding, stretching and other molding methods to produce various products, such as packaging materials, tableware, toys, medical supplies, etc. The temperature for injection molding is usually 170-190 ℃, and the mold temperature is 40-60 ℃; The temperature for blow molding is usually 160-180 ℃, with a stretch ratio of 2-4.
During the molding process, it is important to control the processing temperature and speed to avoid degradation and performance degradation of the blend. At the same time, appropriate post-processing (such as annealing, stretching, etc.) needs to be carried out on the product to improve its mechanical properties and dimensional stability.

Polyvinyl Acetate for Powder Injection Moulding (PIM)

nitchen_dash — Sun, 30 Jun 2024 12:33:35 +0000

Powder Injection Molding (PIM) Powder injection molding is employed in the manufacture of, e.g. medical devices, aerospace or automotive components by the net-shaping technique. The use of an injection molding machine to shape metal or ceramic powder into specific designs allows complex product components to be produced in high volume.

The PIM industry is aware that premixes can vary in composition as a result of dusting and segregation. These effects are clearly evident in compositions that have a high alloy content. However, they appear to be present in all mixtures, independent of alloy content. While dusting is a frequent visible indication, segregation due to particle migration is less apparent, but is nonetheless quite well known.

Variations in composition due to dusting and segregation also give rise to variations in the mechanical and physical properties of blends and of parts made from these blends. It is difficult to quantify the effects of dusting and segregation. However, there is substantial evidence to suggest that these phenomena create both technical and economic problems for the PIM industry. In the former case, they limit the ability to blend metal powders without an additional binder. In the latter case, they may also cause dimensional variations that lead to part rejection, loss of productivity and poor overall economics.

A number of manufacturing options are available for eliminating or reducing the effects of dusting and segregation. The three most significant are: atomization of prealloys, diffusion bonding by annealing, and binder treatment of premixes.

Nitchen Polyvinyl acetate resins, pvac solid resins, HV-1 polyvinyl acetate and HV-4 pvac resin are highly recommended for use as binder in these formulations. Our products combine the following properties:

Outstanding binding
Excellent thermoplasticity
Superior burn-out

Polyvinyl Acetate for Sound Damping Foil

nitchen_dash — Wed, 12 Jun 2024 06:46:24 +0000

A major problem in the automotive industry is the noise generated by the vibration of metal parts in the vehicle. Excessive noise can be reduced or eliminated by effective sound-damping material. Nitchen FV-series polyvinyl acetate resins can serve as the principal component for effective vibration-damping materials and sound-damping sheets.

The resins confer excellent sound-damping properties over a wide temperature range. Sheets formulated with FV-series polyvinyl acetate resins yield more effective sound-damping and produce no toxic emissions and no fogging, compared to asphalt-containing sheets, due to their high molecular weight and chemical composition. Additional benefits exhibited by PVAC-based sound-damping sheets are excellent paintability, ease of handling, and reduced overall weight.

Besides pvac resin (polyvinyl acetate), formulations typically contain plasticizer, filler and carbon black. A wide range of fillers can be used, with calcium carbonate and mica very popular. Adding plasticizer allows the sound-damping sheets to be fine-tuned to the required flexibility and effective temperature range.

Wide Compatibility

Nitchen Polyvinyl acetate resins are highly compatible with a broad spectrum of plasticizers. The most common plasticizers used here are phthalates, phosphates and glycol derivatives. The raw materials are mixed in an extruder and processed into thin sheets. Adhesion of these sheets to the metal can be boosted by applying common pressure-sensitive adhesives in the form of an emulsion. Guide formulations are available on request.

PVAC for Gumbase Produce

nitchen_dash — Mon, 27 May 2024 08:21:06 +0000

The food grade Polyvinyl acetate (PVAC), as the main raw material of gummy gum, is the elastomer and chewy substance of this type of gum, and also a good film-forming and taste improving substance. The novel adhesive based on PVAC has a good taste, large foaming capacity, thick foam film, and is not sticky to the mouth. Sugar made from a soft rubber base is not loose or cracked in winter, not sticky or damp in summer, and has a long shelf life.

According to the taste requirements of each product, each manufacturer heats and mixes it with other raw materials in a certain proportion according to their specific formula, and then uses it as the raw material for making gummy gum base. Becoming a bubbling and chewing part of chewing gum, not to be swallowed.

The macromolecular substances that make up the gumbase are mainly elastomers and polyvinyl acetate. These two types of substances, when combined with other additives, impart appropriate viscoelasticity and plasticity to the gum base, and further combine with chewing gum to achieve appropriate chewiness, film-forming properties, and flavor retention. This article aims to provide a brief explanation of the preparation of gum based gum.

Vinyl Acetate Polymeric resin is a determining factor for some characteristics of chewing gum gum base. It can provide excellent plasticity and chewiness resistance. As a hydrophobic substance, it can also provide certain hydration ability to form a gum base with excellent fragrance and flavor holding ability. Polyvinyl acetate with a polymerization degree below 1000 is the most widely used resin material.

A Typical Formula of Gumbase

Butyl rubber 16% Natural rubber 8%

Polyvinyl Acetate 36% Vinyl acetate gum 18%

Calcium carbonate 10% monohard acetic acid oil 8%

Microcrystalline wax 4%

PVAC as LPA in BMC production

nitchen_dash — Mon, 27 May 2024 08:20:00 +0000

Nitchen polyvinyl acetate solid resins are used as low-profile additives in fiber-reinforced plastics (FRP) composites to achieve zero-shrinkage, class A surface quality, full viscosity control and design flexibility.

Unless a low-profile additive is used in the manufacture of composite parts, high shrinkage will occur. The addition of our pvac resins (polyvinyl acetate) minimizes this shrinkage to less than 0.05 %, resulting in extremely smooth, homogeneous surfaces.

Nitchen PVAC Resin (polyvinyl acetate) is a most effective thermoplastic anti-shrink (low-profile) additive for UP resin composites that are molded at high temperatures. In addition to zero shrinkage, certain high-temperature unsaturated polyester applications, such as SMC and BMC, require effective thickening to ensure easy handling of the composite and good glass-fiber distribution during mold flow: polyvinyl acetate HV grades, in combination with magnesium oxide or calcium oxide, are the perfect thickening systems for unsaturated resin composites. After maturation, this combination is ideal for preventing exudation of the thermoplastic resins. HV grade vinyl acetate homopolymer grades are used when only moderate or no thickening of the UP resin composite is required.

Benefits of our Polyvinyl Acetate (pvac resin):

Zero shrinkage/expansion in FRP composites
Excellent gloss and surface smoothness
Effective thickening of SMC
Easy processing and formulating
Consistently high quality
Good mechanical properties
Rapid and complete solubility in styrene

PVAC As anti shrinkage additive in FRP Pultrusion

nitchen_dash — Mon, 27 May 2024 08:19:06 +0000

Polyvinyl acetate for pultrusion is used as anti-shrinkage additive to: Control shrinkage, prevent the middle crack of thick pultrusion product, prevent the fracture and porosity in the pultrusion process, but also prevent the cracking caused by drilling and drilling of profile items. Increase the flexibility of the product, improve the impact strength for pultrusion profiles.

Polyvinyl Acetate for All Purpose Glue

nitchen_dash — Mon, 27 May 2024 08:17:20 +0000

Polyvinyl Acetate (PVAC) used in Adhesives: As a key material in the Adhesive industries for Foaming product, Timber products, Stationeries, Plastic articles, Paper making etc.

The polyvinyl acetate (pvac) is a GREEN material for adhesives. The polyvinyl acetate (PVAC) itself has a range of viscosity that’s why it can be used in adhesives. But normally the applications in adhesives requires the polyvinyl acetate (pvac) a higher viscosity, relatedly a higher Wm (molecular Weight).

As low profile additive in SMC production

nitchen_dash — Mon, 27 May 2024 08:07:33 +0000

A Typical Application of Polyvinyl Acetate for SMC:

Polyvinyl Acetate (pvac) is used as low-profile additives in fiber-reinforced plastics (FRP) composites to achieve zero-shrinkage, class A surface quality, full viscosity control and design flexibility.

– Nitchen Polyvinyl Acetate (pvac) Solution in Styrene

Nitchen PVAC low-profile additives (LPAs) are almost exclusively used as solutions in styrene. Our polyvinyl
acetate solid resins are readily soluble in styrene and thus enable you to prepare PVAC solutions in styrene as per requirements.

– Preparing a PVAC Solution in Styrene

Add the Nitchen polyvinyl acetate resin to styrene while stirring well to prevent the formation of lumps during dissolution. This should usually be done at room temperature; some temperature increase during the dissolving process is normal and is due to shear friction. Protect the resulting solution from direct light during storage.

Additional heat will increase the rate of dissolution. However, control the stability of the solution, because styrene monomer has a tendency to polymerize. While our PVAC LPA solution typically contains 40% solids, this
may vary with the molecular weight of the grade and the compound formulation.

Average figures for polyvinyl acetate as LPA solutions in styrene are:
HV-Series 30 – 40%