東京理科大学「火災安全科学研究拠点」
Tokyo University of Science “Research Center for Fire Safety Science”■研究成果概要報告書/ Report for Outline of Research Results
FT-IR/Thermal Decomposition Analysis
研

究 課 題of Surface Combustion Characteristics in

Research Topic

Flame Retardant Cross Laminated Timber

実 施 年 度
2018 年度

with Intumescent Nano-Clay Composites
所属
研究代表者

Affiliation

Research

氏名LeaderName

The Laboratory of Adhesion & Bio-Composites,
Seoul National University
Hyun-Joong Kim

e-mailhjokim@snu.ac.kr

共同研究者

所属

KITECH (Korea Institute of Industrial Technology)

Collaborators

Affiliation

SeungHan Shin

氏名KCL (Korea Conformity Laboratories)

NameHyung-Jun Kim

受入担当責任者

氏名

Organization

NameSeoul National University

１．研究の背景および目的/ Background and Aim of Research
Glued laminated timber, also called glulam, is a type of structural timber productcomprising a number of layers of dimensioned timber bonded together with durable,
moisture-resistant structural adhesives.

By laminating a number of smaller pieces of timber, a single large, strong, structuralmember is manufactured from smaller pieces. These structural members are used asvertical columns or horizontal beams, as well as curved, arched shapes. Glulam is readily
produced in curved shapes and it is available in a range of species and appearance

characteristics to meet varied end-use requirements. Connections are usually made withbolts or plain steel dowels and steel plates.
Glulam optimizes the structural values of a renewable resource – wood. Because of theircomposition, large glulam members can be manufactured from a variety of smaller trees
harvested from second- and third-growth forests and plantations.

In order to take advantage of the laminated wood as a building interior material,
analyzing the characteristics of the fire it is very important. Wood has very strong
resistance to fire because wood form a carbide layer in the combustion process.
Despite these fire characteristics, if the laminated wood is exposed to fire, new forms ofproblems are occurred. When the glulam is continuously exposed to heat, the explosionof inside is occurred. These explosion phenomenon becomes greatly threaten safety of
inside and rapidly destroy the structure.
Binder used for producing glulam is reason. Fully curing binder is degraded to single
molecule by high temperature. Binder monomolecular is will be rapidly burned. As theinternal combustion progresses, leading to the explosion.
Therefore, there is a need for research to analyze the combustion characteristics withdegradation products of glulam. In particularly, any change of glulam it causes in thefire environment must analyzed through a quantitative evaluation.

We have confirmed through preliminary studies that surface wood is vulnerable to initialburning. I think we need a new approach to overcome this. We wanted to study whether
it is possible to strengthen the flame retardancy of wood using surface coating method.

２．利用施設及び利用日/ Facility and Schedule・ SDT-FTIR/Cone-calorimeter 装置 （2018 年 12 月 12 日 ～ 12 月 18 日）
・ SDT-FTIR/Cone-calorimeter 装置 （2019 年 1 月 22 日 ～ 1 月 23 日）

３．実験方法・研究成果、および考察（申請時の計画に対する達成度合いも含む）※継続課題の場合は，前年度との関係性，進展度合いについても記載すること。
/ Method, results, and conclusions (degree of achievement compare to application)
For the test, thin plate test specimens were prepared as shown below. The mass wascontrolled at 1 g / sample to control the degree of surface coating.

Test sample
Above - Hard Maple, Down - White Oak

Combustion evaluation residue

The main purpose of this study is to form a protective layer by using UV coating
technology on the surface, and to control the content of thiol in this process to change thecrosslink density. Since thiol acts as a crosslinking agent, the crosslinking density
increases as the content increases.

<Scheme of cross linking system with thiol>
UV coatings are acrylate-based materials and are generally prone to combustion. Whenthe content of thiol is small, the initial burning becomes faster and the maximum peaktends to increase after UV coating. When the content of thiol is increased, the hardening
density is increased and the radical capturing property is strengthened, so that theinitial combustion is delayed. When the content of thiol is increased to 5 phr, the initial
combustion time tends to be delayed by 60 seconds or more.

< Change of combustion characteristics according to thiol content>
Silica acts to control the viscosity of the coating liquid and to lower the thermal
conductivity. In general, silica is composed of small spherical particles. These particles
combine with the surrounding binder to enhance the thermal decomposition properties
or lower the thermal conductivity, thereby enhancing the heat resistance of the entiresystem.
When silica is used, there is little effect when the content is small. However, as thecontent increases, the effect of decreasing the maximum peak and delaying the initial
combustion can be confirmed. Although it does not reduce the overall heat of combustion,
it is possible to confirm the possibility of delaying the initial combustion.

< Change of combustion characteristics according to silica content>
In order to find a way to reduce the maximum peak while lowering the initial heat ofcombustion as a whole, we analyzed the combustion characteristics of a coating material
based on an intumescent system on the surface and a mixture of this material and a UV
coating. While the intumescent system tends to move the graph to the right as a whole,it can be seen that the combustion delay effect is very apparent in the hybrid system.

< Improvement of combustion characteristics by hybrid coating>

４．今後の展望（今後の発展性，見込み等についても記述）

/ Future Perspectives
1.

Analysis of change of combustion compound according to combustion
characteristics

2.

Analysis of correlation between hardening properties and performance ofcoating materials

3. Improvement of combustion characteristics of CLT by combined surface / deeptreatment

５．成果の公表状況（学会への発表，学術誌への投稿等を記述。予定も含む）/ Publishing (presentation, paper, etc. incl. plans in the future)
1.

Variation of Combustion Characteristics of UV Coating Materials with Curing
Density (Submit 'Coatings')

６．経費の使用状況/ Usage of Budget

expendables・Meeting・Travel expense

Personnel expenses

Printing
Contents
ＦＴＩＲ用フCost

Contents

Cost

189,756

SeungHan74,845

CostShinィルター
ＦＴＩＲ用Ｓ

Contents

19,332

Ji-Won Park

130,940

Subtotal

205,785

Ｏ２チェックガス
Subtotal

209,088

Subtotal

Burden of Tokyo University of Science / Total 414,873 Yen

Burden of 414,873 / Total Yen
以上