author: - affiliation: University of Brasília / Takwara Nucleus name: Takwara, Fabio Resck orcid: 0000-0001-8815-3885 date: '2026-03-05' H.5281/zenodo.18827106 H.5281/zenodo.18827106 keywords: - vegetable polyurethane - castor oil - bamboo - bioeconomy - technological sovereignty - Gilberto Chierice - Purcom - Imperveg language: en license: CC BY 4.0 related_works: - 10.5281/zenodo.18827106 - 10.5281/zenodo.18827106 series: Regenerative Amazon Platform Technical Series — Research and Development title: 'From the Tractor to the Rolls Royce — The Planetary Regenerative Synthesis' translations: en: TAK_relatorio-tecnico-pu-vegetal_en.md es: TAK_relatorio-tecnico-pu-vegetal_es.md pt: TAK_relatorio-tecnico-pu-vegetal.md type: Technical-Scientific Bulletin version: '2.1'

From the Tractor to the Rolls Royce — The Planetary Regenerative Synthesis

"Using castor oil for biodiesel is a waste. It's like plowing the land with a Rolls-Royce." — Prof. Dr. Gilberto Orivaldo Chierice, IQSC-USP.

Abstract

This bulletin analyzes the consolidated state of Vegetable Polyurethane (PU) in Brazil, from the pioneering synthesis from castor oil (Ricinus communis) carried out at the University of São Paulo to the formation of a mature industrial ecosystem composed of multiple national manufacturers. It is argued that Vegetable PU simultaneously opens two frontiers of technological sovereignty for the country: the castor oil frontier, which repositions an endemic oilseed from the semi-arid region as a high value-added polymeric input for family farming; and the bamboo frontier, which enables the construction certification of Amazonian grasses through non-toxic waterproofing and nodal fixation. The intersection of these two chains configures an entirely Brazilian circular bioeconomy model with pan-Amazonian scaling potential.

Keywords: vegetable polyurethane · castor oil · bamboo · technological sovereignty · bioeconomy · Gilberto Chierice.

1. Introduction

The structural dependence on petrochemical polymers in civil construction and industrial manufacturing exposes Brazil to exchange rate volatility, chronic environmental liabilities, and exogenous supply chains. Paradoxically, the country holds the largest continuous reserve of native bamboo on the planet (Guadua weberbaueri of the Amazon basin) and ranks among the world's largest producers of castor beans (Ricinus communis), whose oil is the only one among vegetable oils to possess a naturally reactive hydroxyl—making it a polyol ready for polyurethane synthesis without the intermediation of aggressive petrochemical processes.

This bulletin argues that the technological convergence between these two endemic biomasses, mediated by two-component Vegetable Polyurethane, does not represent an incremental solution. It constitutes a geopolitical repositioning: Vegetable PU opens two sovereign frontiers for Brazil—that of castor oil and that of bamboo—whose interweaving produces a circular bioeconomy proposition without parallel in the Global South.

2. Genesis and Scientific Foundation

In the 1980s, Prof. Dr. Gilberto Orivaldo Chierice, heading the Group of Analytical Chemistry and Polymer Technology (GQATP) at the Institute of Chemistry of São Carlos (IQSC-USP), successfully synthesized two-component biopolymers from ricinoleic acid—a component that accounts for approximately 90% of castor oil. The reaction with isocyanate groups generated 100% solid formulations, free of Volatile Organic Compounds (VOCs) and aggressive solvents.

The degree of biocompatibility achieved by Chierice's team elevated the material to biomedical standards: approved by the FDA (USA) under the designation "RG Kryptonite," the compound was applied in bone cements, craniofacial prostheses, and orthopedic implants, with organic rejection rates near zero. In vivo histological studies confirmed progressive bone formation around implants, without foreign body granulomas or phagocytic cells (Ignácio, 1999). The polymer marketed as Polyquil® demonstrated high cellular interaction capacity and stimulated bone regeneration without inflammatory response (Leite & Ramalho, 2008).

The first generation of corporate spin-offs—such as Poliquil (Araraquara, 1997)—transferred this science from the laboratory bench to industrial scale. However, commercial advancement in medicine encountered severe regulatory barriers: IPEA data (2006) indicated that obtaining a Good Manufacturing Practices Certificate from ANVISA took, on average, three years, which discouraged the scaling of castor oil PU medical devices in Brazil (Takwara, 2021).

Internationally, the compound "RG Kryptonite" (Doctors Research Group) obtained 510(k) clearance from the FDA in 2009 for cranioplasty, but faced a Class 2 recall between 2012 and 2015 due to thermal stiffness non-conformities, resulting in a regulatory hiatus for castor oil-based bone cements that persists until the current 2024 landscape.

3. The Brazilian Industrial Ecosystem

Vegetable PU technology has long transcended the laboratory stage. Brazil hosts a consolidated market of specialized formulators and manufacturers, whose technical contributions delineate a mature and diversified supply chain:

EDB Polióis Vegetais — Direct heir of Poliquil and the Chierice legacy. Formulates natural basic polyols (soy and castor oil) and two-component systems for foams, elastomers, and adhesives for the automotive, refrigeration, and civil construction sectors.
Kehl Coat — Specialist in ecological finishes for civil construction. Its PU paints, waterproofers, and sealants are solvent-free, non-toxic, and manufactured with renewable national raw materials.
Purcom — National PU solutions platform with reach in 20 countries. Producer of the BIOFLEX line (100% vegetable polyol, soy-based), zero ODP blowing agents (Ecomate®), and pioneer in reverse logistics and polyurethane recycling in Brazil.

Takwara Developer and Technological Partner: * Imperveg Polímeros Vegetais — Founded in 2008, it holds over 16 years of pioneering activity dedicated to castor oil chemistry (Ricinus communis). With a parameterized portfolio for sanitation (WTPs/WWTPs), structural waterproofing, and biocomposite agglutination, it accumulates over 1,000,000 m² of applications and operations in eight countries. Its European expansion was consolidated through Tecnoveg (Portugal), which uses formulations and validations from the Brazilian biome to meet the rigorous emission and sustainable construction standards of the European Union.

The plurality of this market is one of its greatest strengths. While the medical sector has stagnated in bureaucratic barriers, the comfort and consumption sector registers new sovereign initiatives: in 2024, the Brazilian startup LEAF, in partnership with Colchões Castor, launched 100% biodegradable polyurethane foams with castor oil polyol, reducing the carbon footprint by three times relative to mineral products (CicloVivo, 2024).

The technological arrangement of the Regenerative Amazon Platform elevates Imperveg as its partner and engineering standard, but recognizes each of the other manufacturers forming this ecosystem as potential accredited suppliers for the scaling of biosynthetic housing.

4. The Two Frontiers

4.1. The Castor Oil Frontier

Castor bean is a short-cycle oilseed, drought-resistant, adapted to the northeastern semi-arid region, and cultivable by family farmers. Its oil, historically destined for low value-added biodiesel, finds in Vegetable PU an exponential valorization route: conversion into a functional polyol for high-performance polymers.

This repositioning establishes a sovereign circuit of Sociotechnical Justice: 1. Rural producers cultivate and sell seeds under biotechnological supply contracts. 2. The national chemical industry (Purcom, EDB, Imperveg, Kehl Coat) processes the oil into two-component pre-polymers with rigorous laboratory control. 3. Local cooperatives and enterprises receive the ready-to-apply resin for biocomposites, sanitation, industrial flooring, and housing.

Ricinoleic acid confers upon castor oil PU attributes absent in fossil derivatives: integral non-toxicity (the exclusive formulation of Imperveg, the Platform's chemical standard, attests to the absence of free isocyanate during the curing phase) and bactericidal and fungicidal properties inherent to Ricinus communis. Ricin, a potent toxin in the seeds, is integrally denatured during the thermal processing of the oil, making the polymer safe for human interaction (Chierice & Claro Neto, 2001).

Patiño Guío (2013) highlights the chronic risk that VOCs from petrochemical lines (such as epoxies and asphalts) pose to indoor air quality in built environments—a risk mitigated in the green formulations described herein. However, the competitiveness of this sector in Brazil is still pressured by the dependence on imported isocyanates (MDI), aggravated by the termination of local TPU production by BASF in 2016 (Takwara, 2021).

4.2. The Bamboo Frontier

Amazonian bamboo (Guadua weberbaueri and G. angustifolia) is the structural grass with the highest strength-to-weight ratio among native lignocellulosic materials. Its Achilles' heel, however, is a highly hygroscopic microstructure that collapses from fungal attacks and weathering when unprotected.

Vegetable PU resolves this bottleneck without resorting to fossil-based chemical preservatives. The technical viability of this convergence was attested by Marinho et al. (2013), who demonstrated that the association of castor oil PU with bamboo particles reduces moisture content, swelling, and water absorption of composites, while progressively increasing surface hardness (Shore D) with increasing resin fraction. Comparative studies indicate that the substitution of epoxy resin by castor oil PU in bamboo fiber-reinforced composites occurs without significant loss of mechanical properties, highlighting the sustainability of the components used.

Two complementary applications seal this frontier:

Waterproofing (liquid two-component PU): Applied in layers on previously thermo-rectified culms, it penetrates the cell wall and forms a continuous elastic film that shields against UV and water leaching, extending the service life of structures in the Amazonian environment from 5 to over 50 years.
Nodal fixation (expansive PU): Injected into bamboo internodes at structural connection points, it expands and solidifies the culm interior, creating an anchorage that dispenses with conventional concreting and preserves the natural ductility of the vegetable fiber.

The convergence between castor oil and bamboo is not accidental—it is a sovereignty equation: the resin born in the Northeast seals the biomass that grows in the Amazon, closing an entirely national bioeconomy arc.

5. The Takwara Technology in Public Management and Education

The convergence between Vegetable PU and bamboo is not just an engineering innovation, but a strategic tool for public administration and human development.

The use of opportunistic bamboo, often seen as a management problem in preservation areas, is transformed into a solution. Through "vegetable welding" and PU biocomposites, communities can convert residual biomass into pre-cast components for housing and emergency shelters. Furthermore, the technology allows for the use of other non-hazardous solid wastes (plastics, CDW, mining) as substrates for composites, directly contributing to the National Solid Waste Policy (PNRS).

5.2. Education and Technical Training

The dissemination of this technology requires a strong educational component. Collaboration between the public sector and educational institutions (such as Vocational Schools, Institutes, and Universities) is vital. Including biopolymer technology in technical curricula trains specialists capable of leading the transition to a low-carbon economy, creating green jobs and retaining talent in rural areas through the biotechnological farming of castor oil.

6. Final Considerations

Vegetable PU is not an emerging material. It is a technology consolidated for over three decades, validated in fields as demanding as implantology medicine and sanitation engineering, and supported by a mature industrial ecosystem. Its underutilization in the Brazilian debate on housing, green infrastructure, and climate mitigation is, above all, a dissemination gap—not an evidence gap.

It is recommended that bioeconomy and social housing public policies explicitly incorporate Vegetable PU as a national strategic input, recognizing the dual sovereign asset that Brazil holds: the semi-arid castor bean and the Amazonian bamboo. The articulation between these two resources configures a proprietary technological platform, capable of replacing global chains of toxic resins and high carbon footprint cements with renewable, non-toxic, and decentralized-manufacturing composites.

References

Chierice, G. O., & Claro Neto, S. (2001). Application of Castor Oil Derived Polyurethane in Dentistry. Revista Odonto Ciência. [Hist. Ref./IQSC-USP]

Ferreira, M., Lima, M. P., & Almeida, E. (2016). Preparation and characterization of polyurethanes containing different amounts of baru oil. Polímeros, 26(2), 147-157. DOI: 10.1590/0104-1428.2118.

Ignácio, H. (1999). Evaluation of the porosity and in vivo behavior of the castor oil derived polymer (Ricinus communis). Acta Ortopédica Brasileira, 7(2). [SciELO/USP]

Leite, F. R. M., & Ramalho, L. T. O. (2008). Histological analysis of the biocompatibility of castor oil polymer in bone implants. Acta Cirúrgica Brasileira, 23(1). DOI: 10.1590/S0102-86502008000700012.

Marinho, N. P., Nisgoski, S., Klock, U., Andrade, A. S., & Muñiz, G. I. B. (2013). Physical and thermal characterization of polyurethane composite derived from castor oil associated with bamboo particles. Polímeros: Ciência e Tecnologia, 23(2), 201-205. DOI: 10.1590/S0104-14282013005000007.

Patiño Guío, L. M. (2013). Volatile Organic Compounds in architectural paints: characterization and effects on indoor air quality. Doctoral Thesis, USP. DOI: 10.11606/T.18.2013.tde-23042014-095532.

Takwara, F. (2021, August 23). O Poliuretano Vegetal. Medium. Link.

How to Cite

APA: Takwara, F. R. (2026). From the Tractor to the Rolls Royce — The Planetary Regenerative Synthesis (Version 2.1). Technical-Scientific Bulletin — Takwara Nucleus / University of Brasília. https://doi.org/10.5281/zenodo.18827106