JPH0243012A - Reactive injection molding of reinforced polyurethane molded product - Google Patents
Reactive injection molding of reinforced polyurethane molded productInfo
- Publication number
- JPH0243012A JPH0243012A JP19374588A JP19374588A JPH0243012A JP H0243012 A JPH0243012 A JP H0243012A JP 19374588 A JP19374588 A JP 19374588A JP 19374588 A JP19374588 A JP 19374588A JP H0243012 A JPH0243012 A JP H0243012A
- Authority
- JP
- Japan
- Prior art keywords
- filler
- molded product
- injection molding
- reinforced polyurethane
- polyurethane molded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 15
- 239000004814 polyurethane Substances 0.000 title claims abstract description 15
- 238000001746 injection moulding Methods 0.000 title abstract description 5
- 239000000945 filler Substances 0.000 claims abstract description 42
- 239000013078 crystal Substances 0.000 claims abstract description 27
- 229920005862 polyol Polymers 0.000 claims abstract description 19
- 150000003077 polyols Chemical class 0.000 claims abstract description 19
- 239000000835 fiber Substances 0.000 claims abstract description 18
- 239000012948 isocyanate Substances 0.000 claims abstract description 11
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 11
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims description 15
- 238000010107 reaction injection moulding Methods 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 9
- 238000000465 moulding Methods 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 239000004721 Polyphenylene oxide Substances 0.000 abstract description 2
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 abstract description 2
- 239000012975 dibutyltin dilaurate Substances 0.000 abstract description 2
- 229920000570 polyether Polymers 0.000 abstract description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 abstract 4
- 239000004615 ingredient Substances 0.000 abstract 2
- 150000003839 salts Chemical class 0.000 abstract 2
- 230000006866 deterioration Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 12
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 10
- 239000003365 glass fiber Substances 0.000 description 9
- 230000000704 physical effect Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 239000002990 reinforced plastic Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- FBOUIAKEJMZPQG-AWNIVKPZSA-N (1E)-1-(2,4-dichlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)pent-1-en-3-ol Chemical compound C1=NC=NN1/C(C(O)C(C)(C)C)=C/C1=CC=C(Cl)C=C1Cl FBOUIAKEJMZPQG-AWNIVKPZSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 239000012973 diazabicyclooctane Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/58—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising fillers only, e.g. particles, powder, beads, flakes, spheres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
- B29C67/246—Moulding high reactive monomers or prepolymers, e.g. by reaction injection moulding [RIM], liquid injection moulding [LIM]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/38—Polymers of cycloalkenes, e.g. norbornene or cyclopentene
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は充填材を含有する強化ポリウレタン成形品の
反応射出成形方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a method for reaction injection molding of reinforced polyurethane molded articles containing fillers.
（従来技術）
反応射出成形方法による強化ポリウレタン成形品の成形
は、ポリオール成分またはイソシアネート成分の少なく
とも一方に充填材を混入し、青成分を衡突させて混合す
ると同時に、その混合液を型内に射出し反応させること
によりなされている。(Prior art) Molding of reinforced polyurethane molded products using the reaction injection molding method involves mixing a filler with at least one of the polyol component or the isocyanate component, and mixing the blue component in an equilibrium manner, and at the same time pouring the mixed liquid into the mold. This is done by making an injection reaction.
従来、その充填材として主にガラス繊維が用いられてい
る。また、近年チタン酸カリウムの針状結晶を充填材と
して用いることが、特開昭６１−２０７１号公報で提案
されている。Conventionally, glass fiber has been mainly used as the filler. Furthermore, in recent years, the use of acicular crystals of potassium titanate as a filler has been proposed in Japanese Patent Laid-Open No. 61-2071.
（発明が解法しようとするｆｆｆｆ１）ところで上記充
填材は、成形品の表面にも分散するため、充填材が大き
きすぎると成形品表面が粗くなって製品価値が低下する
ことになる。(ffff1 that the invention attempts to solve) By the way, the filler is also dispersed on the surface of the molded product, so if the filler is too large, the surface of the molded product will become rough and the product value will decrease.
しかし、ガラス繊維は直径が１０１ｚ程度、長さが１０
０口程０と大きいため、ガラス繊維を充填材とした成形
品は、表面の平滑性が劣る問題がある。However, glass fiber has a diameter of about 101z and a length of 10
Since it is as large as 0, molded products using glass fiber as a filler have a problem of poor surface smoothness.
またチタン酸カリウムは、吸水性があり結合剤を用いな
くても水分によって凝集し易い性質を有する。そのため
、チタン酸カリウムの針状結晶を充填材としてポリオー
ル成分またはイソシアネート成分に含有させた場合、特
にはポリオール中に混入させた場合、ポリオール中に含
まれる水分によって凝集し、分散不良となるきらいがあ
る。また、充填材の添加により、該充填材を含む成分の
粘度が上昇することから、両成分の粘度差が非常に大き
くなることがある。その結果、両成分を混合しても混合
不良を生じて、反応の不完全な成形品しか得られない場
合がある。さらには、前記のごとくその充填材がそれ自
身の凝集によって小さな固まりとなって原料中に存在す
るため、成形品においても分散不良を生じ、得られる成
形品の物性が不均一、かつ表面が粗くなり易い問題もあ
る。Further, potassium titanate has water absorption properties and has the property of being easily aggregated by moisture even without using a binder. Therefore, when acicular crystals of potassium titanate are included as a filler in a polyol component or an isocyanate component, especially when mixed into a polyol, they are likely to aggregate due to the moisture contained in the polyol, resulting in poor dispersion. be. Furthermore, since the addition of a filler increases the viscosity of the component containing the filler, the difference in viscosity between the two components may become very large. As a result, even if both components are mixed, poor mixing may occur and only a molded product with incomplete reaction may be obtained. Furthermore, as mentioned above, the filler is present in the raw material as small lumps due to its own aggregation, resulting in poor dispersion in molded products, resulting in uneven physical properties and rough surfaces. There are some easy problems.
一方反応射出成形機は、充填材の沈降分離を防ぐために
ポリオール成分とイソシアネート成分を別個に循環させ
ておき、射出時に両成分を注入ヘッドで衝突させて混・
合させると同時にその混合液を注入ヘッドから射出する
ものである。そのなめ、前記循環時および射出時に、硬
い充填材が反応射出成形機の循環系内面および注入ヘッ
ドにおいて高速、高圧で接触しもしくは衝突して、該成
形機内面に傷を付け、成形機の耐久性を低下させる問題
もある。On the other hand, in a reaction injection molding machine, the polyol component and the isocyanate component are circulated separately to prevent the filler from settling and separating, and the two components are mixed by colliding with the injection head during injection.
At the same time, the mixed liquid is injected from the injection head. Therefore, during the circulation and injection, the hard filler contacts or collides with the inner surface of the circulation system and the injection head of the reaction injection molding machine at high speed and high pressure, damaging the inner surface of the molding machine and reducing the durability of the molding machine. There are also problems that reduce sexuality.
そこでこの発明は、上記の問題を解決して、表面が平滑
でしかも均一な物性を有し、かつ強度の高い強化ポリウ
レタン成形品を、成形機の耐久性を低下させることなく
得ることのできる反応射出成形方法を提供するものであ
る。Therefore, the present invention solves the above-mentioned problems and provides a reaction method that allows a reinforced polyurethane molded product with a smooth surface, uniform physical properties, and high strength to be obtained without reducing the durability of the molding machine. An injection molding method is provided.
（課題を解決するための手段）
この発明は、上記目的を達成するために、ポリオール成
分、インシアネート成分及び前記成分の少なくとも一方
に混入した充填材を、混合射出し反応させることにより
強化ポリウレタン成形品を製造する方法において、充填
材として硫酸カルシウム半水塩の針状結晶繊維をポリオ
ール成分中に分散して用いることとしたのである。(Means for Solving the Problems) In order to achieve the above object, the present invention is capable of forming reinforced polyurethane by mixing and injecting and reacting a polyol component, an incyanate component, and a filler mixed in at least one of the components. In the method for manufacturing the product, it was decided to use acicular crystal fibers of calcium sulfate hemihydrate dispersed in the polyol component as a filler.
この発明において用いるポリオール成分、イソシアネー
ト成分は、従来における強化ポリウレタンの反応射出成
形に用いるものを使用できる。As the polyol component and isocyanate component used in this invention, those used in conventional reaction injection molding of reinforced polyurethane can be used.
硫酸カルシウム半水塩（ＣａＳＯ，・１／２Ｈ２０）の
針状結晶繊維を充填材として添加する量は、強化プラス
チック成形品の用途によって異なるが、通常原料全体く
ポリオール成分とイソシアネート成分と充填材の和）の
５〜２０重景％とされる。The amount of calcium sulfate hemihydrate (CaSO, 1/2H20) acicular crystal fibers added as a filler varies depending on the purpose of the reinforced plastic molded product, but usually the total amount of the polyol component, isocyanate component, and filler is added to the entire raw material. It is considered to be 5-20% of the total weight (Japanese).
また、充填材のすべてを硫酸カルシウム半水塩の針状結
晶繊維としなければならないものではなく、ガラス繊維
その他との併用であってもよい。Furthermore, the filler does not have to be entirely acicular crystal fibers of calcium sulfate hemihydrate, but may be used in combination with glass fibers or other materials.
（作用〉
硫酸カルシウム半水塩の針状結晶繊維は、直径が数μ夏
、平均長が５０〜６０ｐｚと小さいため、該硫酸カルシ
ウム半水塩の針状結晶繊維を充填材として用いて反応射
出成形法により得られた強化ポリウレタン成形品は、表
面が平滑になる。(Function) The needle-like crystal fibers of calcium sulfate hemihydrate have a diameter of several micrometers and an average length of 50 to 60 pz, so the needle-like crystal fibers of calcium sulfate hemihydrate are used as a filler for reaction injection. The reinforced polyurethane molded product obtained by the molding method has a smooth surface.
また、硫酸カルシウム半水塩の針状結晶繊維は、ポリオ
ール成分中において均一に分散し、しかも混合液中にお
いて、固まりを生じることなく良好に分散する。そのた
め、該［酸カルシウム半水塩の針状結晶繊維を充填材と
して添加したポリオール成分の粘度が極端に上昇するこ
とがなく、両成分の混合を良好に行うことができるので
、反応が完全になされた強化プラスチック成形品を得る
ことができる。また、硫酸カルシウム半水塩の針状結晶
繊維は原料中で固まりを生じず、しがも比重が小さいた
めに均一に分散し、得られる強化プラスチック成形品の
物性が均一になる。さらに、硫酸カルシウム半水塩の針
状結晶繊維は、ガラス繊維あるいはチタン酸カリウム針
状結晶よりも硬度が低いため、反応射出成形機を摩耗し
に＜＜、該成形機の耐久性低下を防ぐことができる。Further, the acicular crystal fibers of calcium sulfate hemihydrate are uniformly dispersed in the polyol component, and are well dispersed in the mixed liquid without forming lumps. Therefore, the viscosity of the polyol component to which the acicular crystal fibers of calcium hemihydrate are added as a filler does not increase excessively, and both components can be mixed well, so that the reaction is completely carried out. A reinforced plastic molded product can be obtained. In addition, the acicular crystal fibers of calcium sulfate hemihydrate do not form agglomerates in the raw material, and since they have a low specific gravity, they are evenly dispersed, resulting in uniform physical properties of the resulting reinforced plastic molded product. In addition, the needle crystal fibers of calcium sulfate hemihydrate have lower hardness than glass fibers or potassium titanate needle crystals, which prevents wear on reaction injection molding machines and reduces the durability of the machine. be able to.
（実施例）
以下この発明の実施例について、比較例と対比しながら
説明する。(Example) Examples of the present invention will be described below while comparing them with comparative examples.
この発明の実施例、すなわち充填材に硫酸カルシウム半
水塩の針状結晶繊維を用いて反応射出成形する方法と、
充填材を用いないで反応射出成形する比較例１の方法と
、充填材にガラス繊維を用いて反応射出成形する比較例
２の方法と、充填材にチタン酸カリウムの針状結晶を用
いて反応射出成形する比較例３の方法を各々実施し、強
度等の物性および鮮映性について調べな。An embodiment of the present invention, that is, a reaction injection molding method using needle-like crystal fibers of calcium sulfate hemihydrate as a filler;
The method of Comparative Example 1, which involves reaction injection molding without using a filler, the method of Comparative Example 2, which involves reaction injection molding using glass fiber as a filler, and the method of Comparative Example 2, which involves reaction injection molding using needle-like crystals of potassium titanate as a filler. Perform the injection molding method of Comparative Example 3 and examine physical properties such as strength and image clarity.
なお、配合は下記のものとした。The composition was as follows.
・配合の内容
（＾）ポリオール成分
ポリエーテルポリオール １００重量部（住友バ
イエルウレタン製
バイフレックス１１０−３０）
ダブコ ３３ＬＶ Ｏ，１重量部ジブ
チルチンジラウレート ０．１ ７７充填材
１６．８ １１（Ｉｌｌ）イソシ
アネート成分
イソシアネート５３．６※１１
（住友バイエルウレタン製
スミジュールＰＦ）
※充填材を添加しない比較例１においては５１．２重量
％とじた。・Contents (^) Polyol component Polyether polyol 100 parts by weight (Sumitomo Bayer Urethane Biflex 110-30) DABCO 33LV O, 1 part by weight Dibutyltin dilaurate 0.1 77 Filler
16.8 11 (Ill) Isocyanate component Isocyanate 53.6*11 (Sumidur PF manufactured by Sumitomo Bayer Urethane) *In Comparative Example 1 in which no filler was added, the content was 51.2% by weight.
・充填材の種類
実施例 ： 硫酸カルシウム半水塩（ＣａＳＯ，・１／
２Ｈ２０） の針状結晶繊維（大日精化製フランクリ
ンフアイバーＨ−３０）比較例１：充填材無添加
比較例２：直径１０ＩＩ′ｌ、平均長さ１２０ｐｚのガ
ラス繊維（富士ファイバーグラス製
ＦＥＳＳ−０５５）
比較例３：チタン酸カリウム針状結晶
（大塚化学製ティスモＤ）
第１表に上記充填材の主要な物理的性質をまとめて示す
。・Example of filler type: Calcium sulfate hemihydrate (CaSO, ・1/
2H20) needle-like crystal fiber (Franklin Fiber H-30 manufactured by Dainichiseika Chemicals) Comparative Example 1: No filler added Comparative Example 2: Glass fiber with a diameter of 10 II'l and an average length of 120 pz (FESS-055 manufactured by Fuji Fiber Glass) ) Comparative Example 3: Potassium titanate acicular crystals (Tismo D manufactured by Otsuka Chemical) Table 1 summarizes the main physical properties of the filler.
上記充填材を添加した、または添加してないポリオール
成分とイソシアネート成分を反応射出成形機を用いて、
所定型内に射出し、強化若しくは非強化ポリウレタン成
形品を成形した。Using a reaction injection molding machine, the polyol component with or without the filler added and the isocyanate component are combined.
A reinforced or non-reinforced polyurethane molded product was molded by injection into a predetermined mold.
なお、充填材添加後におけるポリオール成分（比較例１
においては充填材未添加状態）について２５℃の粘度を
測定した。その結果を第２表に示す。In addition, the polyol component after adding the filler (Comparative Example 1)
In this case, the viscosity at 25° C. was measured in the state in which no filler was added. The results are shown in Table 2.
表中○印は充填材の分散が良好なことを示し、×印は充
填材の分散が不良となり易いことを示す。In the table, the mark ◯ indicates that the filler is well dispersed, and the mark × indicates that the filler is likely to be poorly dispersed.
そしてそれら成形品の表面に以下のように脱脂処理、ブ
ライマー処理およびその後上塗り処理を施した。The surfaces of these molded products were subjected to degreasing treatment, brimer treatment, and then top coating treatment as described below.
・脱脂処理ニトリクロルエタンの蒸気で成形品表面を洗
浄した。・The surface of the molded product was cleaned with vapor from degreased nitrichloroethane.
・ブライマー処理＝１液タイプのウレタンラッカーを成
形品表面に膜厚１３±３１Ｊｌで塗布し、８０℃で３０
分間焼き付けた。- Brimer treatment: Apply one-component urethane lacquer to the surface of the molded product with a film thickness of 13 ± 31 Jl, and heat at 80°C for 30°C.
Bake for a minute.
・上塗り処理＝２液タイプのウレタン塗料を成形品表面
に膜厚３０±５ｕｚで塗布して、８０℃で３０分間焼き
付けを行った。- Top coating treatment: A two-component type urethane paint was applied to the surface of the molded product at a film thickness of 30±5 uz, and baked at 80° C. for 30 minutes.
このようにして得られた各試験体について、物性および
試験体表面の鮮映性を調べた。The physical properties and sharpness of the surface of the test piece were examined for each test piece thus obtained.
その試験結果は第３表に示す通りである。第３表中汐の
記号は、成形時の射出方向と測定方向が平行であること
を示し、上の記号は射出方向と測定方向が直交すること
を示す。The test results are shown in Table 3. The symbol in the middle of Table 3 indicates that the injection direction during molding is parallel to the measurement direction, and the symbol above indicates that the injection direction and measurement direction are perpendicular.
なお、曲げ弾性率はＡＳＴＭ−Ｄ７９０、引張り伸びは
ＪＩＳ−に６３０１．熱垂下性はＡＳＴＭ−Ｄ３７６９
、熱膨張係数は（−３０〜３０℃）ＡＳＴＭ−Ｄ６９６
に準拠し、また鮮映性はスミ試験器（株）製肌艶鮮映性
測定装置、粘度はＢ型粘度計を用いて測定した。The flexural modulus is ASTM-D790, and the tensile elongation is JIS-6301. Heat sag property is ASTM-D3769
, thermal expansion coefficient (-30~30℃) ASTM-D696
The image clarity was measured using a skin gloss image clarity measuring device manufactured by Sumi Shikenki Co., Ltd., and the viscosity was measured using a B-type viscometer.
第３表から明らかなように、この発明の実施例は、ガラ
ス繊維またはチタン酸カリウム針状結晶を充填材とする
比較例２．３と比べ、曲げ弾性率および線膨張係数等に
おいて優れた物性を示した。As is clear from Table 3, the examples of the present invention have superior physical properties such as flexural modulus and coefficient of linear expansion compared to Comparative Example 2.3 in which glass fiber or potassium titanate acicular crystals are used as fillers. showed that.
すなわち、曲げ弾性率において〃方向と上方向との差が
小さく、また線膨張係数が小さなものであった。従って
、この発明により所望の製品を成形する場合に、製品の
方向性により曲げ弾性率が変化しないので製品形状を自
由に設計でき、また線膨張係数が小さいため温度差の大
きい用途にも適用することができる。That is, the difference in bending elastic modulus between the direction and the upward direction was small, and the coefficient of linear expansion was small. Therefore, when molding a desired product using this invention, the product shape can be freely designed because the bending modulus does not change depending on the orientation of the product, and the linear expansion coefficient is small, so it can be applied to applications with large temperature differences. be able to.
更に平滑性の指標となる鮮映性については、ガラス繊維
又はチタン酸カリウム針状結晶を充填材とする場合より
も良好な値を示した。これは、この発明において用いる
硫酸カルシウム半水塩の針状結晶繊維が、直径２■、平
均長さ５０〜６０ｐｚと小さいこと、および第１表のよ
うに比重が小さく分殖しにくいこと、および第２表に示
すように比較例３におけるチタン酸カリウム針状結晶よ
りも分散性が良好で混合液中で固まりにくいことの相乗
作用によると推察される
又、この発明の実施例においてブライマーとして２液タ
イプを用いた場合には、鮮映性が０．９〜１．０となり
、極めて良好な外観のものが得られた。Furthermore, the image clarity, which is an index of smoothness, showed better values than when glass fiber or potassium titanate acicular crystals were used as the filler. This is because the needle-like crystal fibers of calcium sulfate hemihydrate used in this invention are small with a diameter of 2 cm and an average length of 50 to 60 pz, and as shown in Table 1, their specific gravity is small and difficult to split. As shown in Table 2, this is presumed to be due to the synergistic effect of the potassium titanate needle crystals having better dispersibility and being less likely to solidify in the mixed liquid than the potassium titanate needle crystals in Comparative Example 3. When the liquid type was used, the image clarity was 0.9 to 1.0, and an extremely good appearance was obtained.
（効果）
この発明は、充填材として硫酸カルシウム半水塩の針状
結晶繊維を用いて、強化ポリウレタン成形品を反応射出
成形するものである。そして、その微細かつ低比重から
なる硫酸カルシウム半水塩の針状結晶繊維が、原料中に
良好に分散するため、強度に優れ、かつ表面が平滑な強
化ポリウレタン成形品を得られる効果がある。(Effects) In this invention, a reinforced polyurethane molded product is reaction injection molded using needle-like crystal fibers of calcium sulfate hemihydrate as a filler. Since the fine and low specific gravity acicular crystal fibers of calcium sulfate hemihydrate are well dispersed in the raw material, it is possible to obtain a reinforced polyurethane molded product with excellent strength and a smooth surface.
また、硫酸カルシウム半水塩の針状結晶ｍ維の硬度が低
いため、反応射出成形機を摩耗することが少なく、該成
形機の耐久性低下を防ぐこともできる。In addition, since the hardness of the acicular crystal fibers of calcium sulfate hemihydrate is low, the reaction injection molding machine is less likely to be worn out, and a decrease in the durability of the molding machine can be prevented.
Claims (1)
なくとも一方に混入した充填材を、混合射出し反応させ
ることにより強化ポリウレタン成形品を製造する方法に
おいて、充填材として硫酸カルシウム半水塩の針状結晶
繊維を、ポリオール成分中に分散して用いることを特徴
とする強化ポリウレタン成形品の反応射出成形方法。In a method for producing a reinforced polyurethane molded article by mixing and injection reacting a polyol component, an isocyanate component, and a filler mixed in at least one of the components, acicular crystal fibers of calcium sulfate hemihydrate are used as a filler, A reaction injection molding method for a reinforced polyurethane molded product, which is characterized in that the reinforced polyurethane molded product is used by being dispersed in a polyol component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19374588A JPH0243012A (en) | 1988-08-03 | 1988-08-03 | Reactive injection molding of reinforced polyurethane molded product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19374588A JPH0243012A (en) | 1988-08-03 | 1988-08-03 | Reactive injection molding of reinforced polyurethane molded product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0243012A true JPH0243012A (en) | 1990-02-13 |
Family
ID=16313105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19374588A Pending JPH0243012A (en) | 1988-08-03 | 1988-08-03 | Reactive injection molding of reinforced polyurethane molded product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0243012A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02169214A (en) * | 1988-12-23 | 1990-06-29 | Mitsubishi Motors Corp | Reinforcing reaction injection molding method |
| US5289052A (en) * | 1991-11-30 | 1994-02-22 | Samsung Electronics Co., Ltd. | Monostable multivibrator |
-
1988
- 1988-08-03 JP JP19374588A patent/JPH0243012A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02169214A (en) * | 1988-12-23 | 1990-06-29 | Mitsubishi Motors Corp | Reinforcing reaction injection molding method |
| US5289052A (en) * | 1991-11-30 | 1994-02-22 | Samsung Electronics Co., Ltd. | Monostable multivibrator |
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